1169 lines
48 KiB
Java
1169 lines
48 KiB
Java
/*
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* Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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import java.io.*;
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import java.util.Properties;
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import java.util.PropertyPermission;
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import java.util.StringTokenizer;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.security.AllPermission;
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import java.nio.channels.Channel;
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import java.nio.channels.spi.SelectorProvider;
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import sun.reflect.CallerSensitive;
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import sun.reflect.Reflection;
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import sun.security.util.SecurityConstants;
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final class StdIO
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{
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private StdIO() { }
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static InputStream in = new BufferedInputStream(new FileInputStream(FileDescriptor.in));
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static PrintStream out = new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.out), 128), true);
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static PrintStream err = new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.err), 128), true);
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}
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final class Props
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{
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private Props() { }
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static Properties props;
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static String lineSeparator;
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static
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{
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props = new Properties();
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VMSystemProperties.initProperties(props);
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lineSeparator = props.getProperty("line.separator");
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// after we've initialized the system properties, we need to fixate certain
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// results that depend on system properties, because we don't want Java code to
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// be able to change the behavior by setting these system properties.
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ClassLoader.initializeLibraryPaths(props);
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sun.misc.VM.saveAndRemoveProperties(props);
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// now that we've initialized the system properties (which are our only
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// notion of "booting" the VM) we set the booted flag.
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sun.misc.VM.booted();
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}
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}
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/**
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* The <code>System</code> class contains several useful class fields
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* and methods. It cannot be instantiated.
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*
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* <p>Among the facilities provided by the <code>System</code> class
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* are standard input, standard output, and error output streams;
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* access to externally defined properties and environment
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* variables; a means of loading files and libraries; and a utility
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* method for quickly copying a portion of an array.
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*
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* @author unascribed
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* @since JDK1.0
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*/
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public final class System {
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/** Don't let anyone instantiate this class */
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private System() {
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}
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/**
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* The "standard" input stream. This stream is already
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* open and ready to supply input data. Typically this stream
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* corresponds to keyboard input or another input source specified by
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* the host environment or user.
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*/
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@ikvm.lang.Property(get="get_in")
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public final static InputStream in;
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static { in = null; }
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private static InputStream get_in()
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{
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return StdIO.in;
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}
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/**
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* The "standard" output stream. This stream is already
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* open and ready to accept output data. Typically this stream
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* corresponds to display output or another output destination
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* specified by the host environment or user.
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* <p>
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* For simple stand-alone Java applications, a typical way to write
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* a line of output data is:
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* <blockquote><pre>
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* System.out.println(data)
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* </pre></blockquote>
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* <p>
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* See the <code>println</code> methods in class <code>PrintStream</code>.
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*
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* @see java.io.PrintStream#println()
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* @see java.io.PrintStream#println(boolean)
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* @see java.io.PrintStream#println(char)
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* @see java.io.PrintStream#println(char[])
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* @see java.io.PrintStream#println(double)
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* @see java.io.PrintStream#println(float)
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* @see java.io.PrintStream#println(int)
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* @see java.io.PrintStream#println(long)
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* @see java.io.PrintStream#println(java.lang.Object)
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* @see java.io.PrintStream#println(java.lang.String)
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*/
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@ikvm.lang.Property(get="get_out")
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public final static PrintStream out;
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static { out = null; }
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private static PrintStream get_out()
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{
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return StdIO.out;
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}
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/**
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* The "standard" error output stream. This stream is already
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* open and ready to accept output data.
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* <p>
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* Typically this stream corresponds to display output or another
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* output destination specified by the host environment or user. By
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* convention, this output stream is used to display error messages
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* or other information that should come to the immediate attention
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* of a user even if the principal output stream, the value of the
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* variable <code>out</code>, has been redirected to a file or other
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* destination that is typically not continuously monitored.
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*/
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@ikvm.lang.Property(get="get_err")
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public final static PrintStream err;
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static { err = null ; }
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private static PrintStream get_err()
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{
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return StdIO.err;
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}
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/* The security manager for the system.
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*/
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private static volatile SecurityManager security;
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/**
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* Reassigns the "standard" input stream.
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*
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* <p>First, if there is a security manager, its <code>checkPermission</code>
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* method is called with a <code>RuntimePermission("setIO")</code> permission
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* to see if it's ok to reassign the "standard" input stream.
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* <p>
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*
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* @param in the new standard input stream.
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*
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* @throws SecurityException
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* if a security manager exists and its
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* <code>checkPermission</code> method doesn't allow
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* reassigning of the standard input stream.
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*
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* @see SecurityManager#checkPermission
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* @see java.lang.RuntimePermission
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*
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* @since JDK1.1
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*/
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public static void setIn(InputStream in) {
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checkIO();
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StdIO.in = in;
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}
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/**
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* Reassigns the "standard" output stream.
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*
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* <p>First, if there is a security manager, its <code>checkPermission</code>
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* method is called with a <code>RuntimePermission("setIO")</code> permission
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* to see if it's ok to reassign the "standard" output stream.
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*
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* @param out the new standard output stream
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*
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* @throws SecurityException
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* if a security manager exists and its
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* <code>checkPermission</code> method doesn't allow
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* reassigning of the standard output stream.
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*
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* @see SecurityManager#checkPermission
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* @see java.lang.RuntimePermission
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*
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* @since JDK1.1
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*/
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public static void setOut(PrintStream out) {
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checkIO();
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StdIO.out = out;
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}
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/**
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* Reassigns the "standard" error output stream.
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*
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* <p>First, if there is a security manager, its <code>checkPermission</code>
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* method is called with a <code>RuntimePermission("setIO")</code> permission
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* to see if it's ok to reassign the "standard" error output stream.
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*
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* @param err the new standard error output stream.
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*
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* @throws SecurityException
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* if a security manager exists and its
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* <code>checkPermission</code> method doesn't allow
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* reassigning of the standard error output stream.
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*
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* @see SecurityManager#checkPermission
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* @see java.lang.RuntimePermission
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*
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* @since JDK1.1
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*/
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public static void setErr(PrintStream err) {
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checkIO();
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StdIO.err = err;
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}
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private static volatile Console cons;
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/**
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* Returns the unique {@link java.io.Console Console} object associated
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* with the current Java virtual machine, if any.
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*
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* @return The system console, if any, otherwise <tt>null</tt>.
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*
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* @since 1.6
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*/
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public static Console console() {
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if (cons == null) {
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synchronized (System.class) {
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cons = sun.misc.SharedSecrets.getJavaIOAccess().console();
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}
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}
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return cons;
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}
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/**
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* Returns the channel inherited from the entity that created this
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* Java virtual machine.
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*
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* <p> This method returns the channel obtained by invoking the
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* {@link java.nio.channels.spi.SelectorProvider#inheritedChannel
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* inheritedChannel} method of the system-wide default
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* {@link java.nio.channels.spi.SelectorProvider} object. </p>
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*
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* <p> In addition to the network-oriented channels described in
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* {@link java.nio.channels.spi.SelectorProvider#inheritedChannel
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* inheritedChannel}, this method may return other kinds of
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* channels in the future.
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*
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* @return The inherited channel, if any, otherwise <tt>null</tt>.
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*
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* @throws IOException
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* If an I/O error occurs
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*
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* @throws SecurityException
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* If a security manager is present and it does not
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* permit access to the channel.
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*
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* @since 1.5
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*/
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public static Channel inheritedChannel() throws IOException {
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return SelectorProvider.provider().inheritedChannel();
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}
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private static void checkIO() {
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SecurityManager sm = getSecurityManager();
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if (sm != null) {
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sm.checkPermission(new RuntimePermission("setIO"));
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}
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}
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/**
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* Sets the System security.
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*
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* <p> If there is a security manager already installed, this method first
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* calls the security manager's <code>checkPermission</code> method
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* with a <code>RuntimePermission("setSecurityManager")</code>
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* permission to ensure it's ok to replace the existing
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* security manager.
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* This may result in throwing a <code>SecurityException</code>.
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*
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* <p> Otherwise, the argument is established as the current
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* security manager. If the argument is <code>null</code> and no
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* security manager has been established, then no action is taken and
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* the method simply returns.
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*
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* @param s the security manager.
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* @exception SecurityException if the security manager has already
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* been set and its <code>checkPermission</code> method
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* doesn't allow it to be replaced.
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* @see #getSecurityManager
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* @see SecurityManager#checkPermission
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* @see java.lang.RuntimePermission
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*/
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public static
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void setSecurityManager(final SecurityManager s) {
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try {
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s.checkPackageAccess("java.lang");
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} catch (Exception e) {
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// no-op
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}
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setSecurityManager0(s);
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}
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private static synchronized
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void setSecurityManager0(final SecurityManager s) {
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// [IKVM] force sun.misc.Launcher to initialize, because it assumes that it runs without a SecurityManager
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sun.misc.Launcher.getLauncher();
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SecurityManager sm = getSecurityManager();
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if (sm != null) {
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// ask the currently installed security manager if we
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// can replace it.
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sm.checkPermission(new RuntimePermission
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("setSecurityManager"));
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}
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if ((s != null) && (s.getClass().getClassLoader() != null)) {
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// New security manager class is not on bootstrap classpath.
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// Cause policy to get initialized before we install the new
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// security manager, in order to prevent infinite loops when
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// trying to initialize the policy (which usually involves
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// accessing some security and/or system properties, which in turn
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// calls the installed security manager's checkPermission method
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// which will loop infinitely if there is a non-system class
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// (in this case: the new security manager class) on the stack).
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AccessController.doPrivileged(new PrivilegedAction<Object>() {
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public Object run() {
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s.getClass().getProtectionDomain().implies
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(SecurityConstants.ALL_PERMISSION);
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return null;
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}
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});
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}
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security = s;
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}
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/**
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* Gets the system security interface.
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*
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* @return if a security manager has already been established for the
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* current application, then that security manager is returned;
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* otherwise, <code>null</code> is returned.
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* @see #setSecurityManager
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*/
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public static SecurityManager getSecurityManager() {
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return security;
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}
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/**
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* Returns the current time in milliseconds. Note that
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* while the unit of time of the return value is a millisecond,
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* the granularity of the value depends on the underlying
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* operating system and may be larger. For example, many
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* operating systems measure time in units of tens of
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* milliseconds.
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*
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* <p> See the description of the class <code>Date</code> for
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* a discussion of slight discrepancies that may arise between
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* "computer time" and coordinated universal time (UTC).
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*
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* @return the difference, measured in milliseconds, between
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* the current time and midnight, January 1, 1970 UTC.
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* @see java.util.Date
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*/
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public static long currentTimeMillis() {
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long january_1st_1970 = 62135596800000L;
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return cli.System.DateTime.get_UtcNow().get_Ticks() / 10000L - january_1st_1970;
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}
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/**
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* Returns the current value of the running Java Virtual Machine's
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* high-resolution time source, in nanoseconds.
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*
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* <p>This method can only be used to measure elapsed time and is
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* not related to any other notion of system or wall-clock time.
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* The value returned represents nanoseconds since some fixed but
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* arbitrary <i>origin</i> time (perhaps in the future, so values
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* may be negative). The same origin is used by all invocations of
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* this method in an instance of a Java virtual machine; other
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* virtual machine instances are likely to use a different origin.
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*
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* <p>This method provides nanosecond precision, but not necessarily
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* nanosecond resolution (that is, how frequently the value changes)
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* - no guarantees are made except that the resolution is at least as
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* good as that of {@link #currentTimeMillis()}.
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*
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* <p>Differences in successive calls that span greater than
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* approximately 292 years (2<sup>63</sup> nanoseconds) will not
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* correctly compute elapsed time due to numerical overflow.
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*
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* <p>The values returned by this method become meaningful only when
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* the difference between two such values, obtained within the same
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* instance of a Java virtual machine, is computed.
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*
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* <p> For example, to measure how long some code takes to execute:
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* <pre> {@code
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* long startTime = System.nanoTime();
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* // ... the code being measured ...
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* long estimatedTime = System.nanoTime() - startTime;}</pre>
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*
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* <p>To compare two nanoTime values
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* <pre> {@code
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* long t0 = System.nanoTime();
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* ...
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* long t1 = System.nanoTime();}</pre>
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*
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* one should use {@code t1 - t0 < 0}, not {@code t1 < t0},
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* because of the possibility of numerical overflow.
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*
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* @return the current value of the running Java Virtual Machine's
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* high-resolution time source, in nanoseconds
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* @since 1.5
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*/
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public static long nanoTime() {
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long NANOS_PER_SEC = 1000000000;
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double current = cli.System.Diagnostics.Stopwatch.GetTimestamp();
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double freq = cli.System.Diagnostics.Stopwatch.Frequency;
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return (long)((current / freq) * NANOS_PER_SEC);
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}
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/**
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* Copies an array from the specified source array, beginning at the
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* specified position, to the specified position of the destination array.
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* A subsequence of array components are copied from the source
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* array referenced by <code>src</code> to the destination array
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* referenced by <code>dest</code>. The number of components copied is
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* equal to the <code>length</code> argument. The components at
|
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* positions <code>srcPos</code> through
|
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* <code>srcPos+length-1</code> in the source array are copied into
|
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* positions <code>destPos</code> through
|
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* <code>destPos+length-1</code>, respectively, of the destination
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* array.
|
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* <p>
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* If the <code>src</code> and <code>dest</code> arguments refer to the
|
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* same array object, then the copying is performed as if the
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* components at positions <code>srcPos</code> through
|
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* <code>srcPos+length-1</code> were first copied to a temporary
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|
* array with <code>length</code> components and then the contents of
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* the temporary array were copied into positions
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* <code>destPos</code> through <code>destPos+length-1</code> of the
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* destination array.
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* <p>
|
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* If <code>dest</code> is <code>null</code>, then a
|
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* <code>NullPointerException</code> is thrown.
|
|
* <p>
|
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* If <code>src</code> is <code>null</code>, then a
|
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* <code>NullPointerException</code> is thrown and the destination
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* array is not modified.
|
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* <p>
|
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* Otherwise, if any of the following is true, an
|
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* <code>ArrayStoreException</code> is thrown and the destination is
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* not modified:
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* <ul>
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* <li>The <code>src</code> argument refers to an object that is not an
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* array.
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* <li>The <code>dest</code> argument refers to an object that is not an
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* array.
|
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* <li>The <code>src</code> argument and <code>dest</code> argument refer
|
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* to arrays whose component types are different primitive types.
|
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* <li>The <code>src</code> argument refers to an array with a primitive
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* component type and the <code>dest</code> argument refers to an array
|
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* with a reference component type.
|
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* <li>The <code>src</code> argument refers to an array with a reference
|
|
* component type and the <code>dest</code> argument refers to an array
|
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* with a primitive component type.
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* </ul>
|
|
* <p>
|
|
* Otherwise, if any of the following is true, an
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* <code>IndexOutOfBoundsException</code> is
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* thrown and the destination is not modified:
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* <ul>
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* <li>The <code>srcPos</code> argument is negative.
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* <li>The <code>destPos</code> argument is negative.
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* <li>The <code>length</code> argument is negative.
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* <li><code>srcPos+length</code> is greater than
|
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* <code>src.length</code>, the length of the source array.
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* <li><code>destPos+length</code> is greater than
|
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* <code>dest.length</code>, the length of the destination array.
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|
* </ul>
|
|
* <p>
|
|
* Otherwise, if any actual component of the source array from
|
|
* position <code>srcPos</code> through
|
|
* <code>srcPos+length-1</code> cannot be converted to the component
|
|
* type of the destination array by assignment conversion, an
|
|
* <code>ArrayStoreException</code> is thrown. In this case, let
|
|
* <b><i>k</i></b> be the smallest nonnegative integer less than
|
|
* length such that <code>src[srcPos+</code><i>k</i><code>]</code>
|
|
* cannot be converted to the component type of the destination
|
|
* array; when the exception is thrown, source array components from
|
|
* positions <code>srcPos</code> through
|
|
* <code>srcPos+</code><i>k</i><code>-1</code>
|
|
* will already have been copied to destination array positions
|
|
* <code>destPos</code> through
|
|
* <code>destPos+</code><i>k</I><code>-1</code> and no other
|
|
* positions of the destination array will have been modified.
|
|
* (Because of the restrictions already itemized, this
|
|
* paragraph effectively applies only to the situation where both
|
|
* arrays have component types that are reference types.)
|
|
*
|
|
* @param src the source array.
|
|
* @param srcPos starting position in the source array.
|
|
* @param dest the destination array.
|
|
* @param destPos starting position in the destination data.
|
|
* @param length the number of array elements to be copied.
|
|
* @exception IndexOutOfBoundsException if copying would cause
|
|
* access of data outside array bounds.
|
|
* @exception ArrayStoreException if an element in the <code>src</code>
|
|
* array could not be stored into the <code>dest</code> array
|
|
* because of a type mismatch.
|
|
* @exception NullPointerException if either <code>src</code> or
|
|
* <code>dest</code> is <code>null</code>.
|
|
*/
|
|
public static native void arraycopy(Object src, int srcPos,
|
|
Object dest, int destPos,
|
|
int length);
|
|
|
|
/**
|
|
* Returns the same hash code for the given object as
|
|
* would be returned by the default method hashCode(),
|
|
* whether or not the given object's class overrides
|
|
* hashCode().
|
|
* The hash code for the null reference is zero.
|
|
*
|
|
* @param x object for which the hashCode is to be calculated
|
|
* @return the hashCode
|
|
* @since JDK1.1
|
|
*/
|
|
public static int identityHashCode(Object x) {
|
|
return cli.System.Runtime.CompilerServices.RuntimeHelpers.GetHashCode(x);
|
|
}
|
|
|
|
/**
|
|
* System properties. The following properties are guaranteed to be defined:
|
|
* <dl>
|
|
* <dt>java.version <dd>Java version number
|
|
* <dt>java.vendor <dd>Java vendor specific string
|
|
* <dt>java.vendor.url <dd>Java vendor URL
|
|
* <dt>java.home <dd>Java installation directory
|
|
* <dt>java.class.version <dd>Java class version number
|
|
* <dt>java.class.path <dd>Java classpath
|
|
* <dt>os.name <dd>Operating System Name
|
|
* <dt>os.arch <dd>Operating System Architecture
|
|
* <dt>os.version <dd>Operating System Version
|
|
* <dt>file.separator <dd>File separator ("/" on Unix)
|
|
* <dt>path.separator <dd>Path separator (":" on Unix)
|
|
* <dt>line.separator <dd>Line separator ("\n" on Unix)
|
|
* <dt>user.name <dd>User account name
|
|
* <dt>user.home <dd>User home directory
|
|
* <dt>user.dir <dd>User's current working directory
|
|
* </dl>
|
|
*/
|
|
|
|
//private static native Properties initProperties(Properties props);
|
|
|
|
/**
|
|
* Determines the current system properties.
|
|
* <p>
|
|
* First, if there is a security manager, its
|
|
* <code>checkPropertiesAccess</code> method is called with no
|
|
* arguments. This may result in a security exception.
|
|
* <p>
|
|
* The current set of system properties for use by the
|
|
* {@link #getProperty(String)} method is returned as a
|
|
* <code>Properties</code> object. If there is no current set of
|
|
* system properties, a set of system properties is first created and
|
|
* initialized. This set of system properties always includes values
|
|
* for the following keys:
|
|
* <table summary="Shows property keys and associated values">
|
|
* <tr><th>Key</th>
|
|
* <th>Description of Associated Value</th></tr>
|
|
* <tr><td><code>java.version</code></td>
|
|
* <td>Java Runtime Environment version</td></tr>
|
|
* <tr><td><code>java.vendor</code></td>
|
|
* <td>Java Runtime Environment vendor</td></tr
|
|
* <tr><td><code>java.vendor.url</code></td>
|
|
* <td>Java vendor URL</td></tr>
|
|
* <tr><td><code>java.home</code></td>
|
|
* <td>Java installation directory</td></tr>
|
|
* <tr><td><code>java.vm.specification.version</code></td>
|
|
* <td>Java Virtual Machine specification version</td></tr>
|
|
* <tr><td><code>java.vm.specification.vendor</code></td>
|
|
* <td>Java Virtual Machine specification vendor</td></tr>
|
|
* <tr><td><code>java.vm.specification.name</code></td>
|
|
* <td>Java Virtual Machine specification name</td></tr>
|
|
* <tr><td><code>java.vm.version</code></td>
|
|
* <td>Java Virtual Machine implementation version</td></tr>
|
|
* <tr><td><code>java.vm.vendor</code></td>
|
|
* <td>Java Virtual Machine implementation vendor</td></tr>
|
|
* <tr><td><code>java.vm.name</code></td>
|
|
* <td>Java Virtual Machine implementation name</td></tr>
|
|
* <tr><td><code>java.specification.version</code></td>
|
|
* <td>Java Runtime Environment specification version</td></tr>
|
|
* <tr><td><code>java.specification.vendor</code></td>
|
|
* <td>Java Runtime Environment specification vendor</td></tr>
|
|
* <tr><td><code>java.specification.name</code></td>
|
|
* <td>Java Runtime Environment specification name</td></tr>
|
|
* <tr><td><code>java.class.version</code></td>
|
|
* <td>Java class format version number</td></tr>
|
|
* <tr><td><code>java.class.path</code></td>
|
|
* <td>Java class path</td></tr>
|
|
* <tr><td><code>java.library.path</code></td>
|
|
* <td>List of paths to search when loading libraries</td></tr>
|
|
* <tr><td><code>java.io.tmpdir</code></td>
|
|
* <td>Default temp file path</td></tr>
|
|
* <tr><td><code>java.compiler</code></td>
|
|
* <td>Name of JIT compiler to use</td></tr>
|
|
* <tr><td><code>java.ext.dirs</code></td>
|
|
* <td>Path of extension directory or directories</td></tr>
|
|
* <tr><td><code>os.name</code></td>
|
|
* <td>Operating system name</td></tr>
|
|
* <tr><td><code>os.arch</code></td>
|
|
* <td>Operating system architecture</td></tr>
|
|
* <tr><td><code>os.version</code></td>
|
|
* <td>Operating system version</td></tr>
|
|
* <tr><td><code>file.separator</code></td>
|
|
* <td>File separator ("/" on UNIX)</td></tr>
|
|
* <tr><td><code>path.separator</code></td>
|
|
* <td>Path separator (":" on UNIX)</td></tr>
|
|
* <tr><td><code>line.separator</code></td>
|
|
* <td>Line separator ("\n" on UNIX)</td></tr>
|
|
* <tr><td><code>user.name</code></td>
|
|
* <td>User's account name</td></tr>
|
|
* <tr><td><code>user.home</code></td>
|
|
* <td>User's home directory</td></tr>
|
|
* <tr><td><code>user.dir</code></td>
|
|
* <td>User's current working directory</td></tr>
|
|
* </table>
|
|
* <p>
|
|
* Multiple paths in a system property value are separated by the path
|
|
* separator character of the platform.
|
|
* <p>
|
|
* Note that even if the security manager does not permit the
|
|
* <code>getProperties</code> operation, it may choose to permit the
|
|
* {@link #getProperty(String)} operation.
|
|
*
|
|
* @return the system properties
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkPropertiesAccess</code> method doesn't allow access
|
|
* to the system properties.
|
|
* @see #setProperties
|
|
* @see java.lang.SecurityException
|
|
* @see java.lang.SecurityManager#checkPropertiesAccess()
|
|
* @see java.util.Properties
|
|
*/
|
|
public static Properties getProperties() {
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPropertiesAccess();
|
|
}
|
|
|
|
return Props.props;
|
|
}
|
|
|
|
/**
|
|
* Returns the system-dependent line separator string. It always
|
|
* returns the same value - the initial value of the {@linkplain
|
|
* #getProperty(String) system property} {@code line.separator}.
|
|
*
|
|
* <p>On UNIX systems, it returns {@code "\n"}; on Microsoft
|
|
* Windows systems it returns {@code "\r\n"}.
|
|
*/
|
|
public static String lineSeparator() {
|
|
return Props.lineSeparator;
|
|
}
|
|
|
|
/**
|
|
* Sets the system properties to the <code>Properties</code>
|
|
* argument.
|
|
* <p>
|
|
* First, if there is a security manager, its
|
|
* <code>checkPropertiesAccess</code> method is called with no
|
|
* arguments. This may result in a security exception.
|
|
* <p>
|
|
* The argument becomes the current set of system properties for use
|
|
* by the {@link #getProperty(String)} method. If the argument is
|
|
* <code>null</code>, then the current set of system properties is
|
|
* forgotten.
|
|
*
|
|
* @param props the new system properties.
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkPropertiesAccess</code> method doesn't allow access
|
|
* to the system properties.
|
|
* @see #getProperties
|
|
* @see java.util.Properties
|
|
* @see java.lang.SecurityException
|
|
* @see java.lang.SecurityManager#checkPropertiesAccess()
|
|
*/
|
|
public static void setProperties(Properties props) {
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPropertiesAccess();
|
|
}
|
|
if (props == null) {
|
|
props = new Properties();
|
|
VMSystemProperties.initProperties(props);
|
|
}
|
|
Props.props = props;
|
|
}
|
|
|
|
/**
|
|
* Gets the system property indicated by the specified key.
|
|
* <p>
|
|
* First, if there is a security manager, its
|
|
* <code>checkPropertyAccess</code> method is called with the key as
|
|
* its argument. This may result in a SecurityException.
|
|
* <p>
|
|
* If there is no current set of system properties, a set of system
|
|
* properties is first created and initialized in the same manner as
|
|
* for the <code>getProperties</code> method.
|
|
*
|
|
* @param key the name of the system property.
|
|
* @return the string value of the system property,
|
|
* or <code>null</code> if there is no property with that key.
|
|
*
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkPropertyAccess</code> method doesn't allow
|
|
* access to the specified system property.
|
|
* @exception NullPointerException if <code>key</code> is
|
|
* <code>null</code>.
|
|
* @exception IllegalArgumentException if <code>key</code> is empty.
|
|
* @see #setProperty
|
|
* @see java.lang.SecurityException
|
|
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
|
|
* @see java.lang.System#getProperties()
|
|
*/
|
|
public static String getProperty(String key) {
|
|
checkKey(key);
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPropertyAccess(key);
|
|
}
|
|
|
|
return Props.props.getProperty(key);
|
|
}
|
|
|
|
/**
|
|
* Gets the system property indicated by the specified key.
|
|
* <p>
|
|
* First, if there is a security manager, its
|
|
* <code>checkPropertyAccess</code> method is called with the
|
|
* <code>key</code> as its argument.
|
|
* <p>
|
|
* If there is no current set of system properties, a set of system
|
|
* properties is first created and initialized in the same manner as
|
|
* for the <code>getProperties</code> method.
|
|
*
|
|
* @param key the name of the system property.
|
|
* @param def a default value.
|
|
* @return the string value of the system property,
|
|
* or the default value if there is no property with that key.
|
|
*
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkPropertyAccess</code> method doesn't allow
|
|
* access to the specified system property.
|
|
* @exception NullPointerException if <code>key</code> is
|
|
* <code>null</code>.
|
|
* @exception IllegalArgumentException if <code>key</code> is empty.
|
|
* @see #setProperty
|
|
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
|
|
* @see java.lang.System#getProperties()
|
|
*/
|
|
public static String getProperty(String key, String def) {
|
|
checkKey(key);
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPropertyAccess(key);
|
|
}
|
|
|
|
return Props.props.getProperty(key, def);
|
|
}
|
|
|
|
/**
|
|
* Sets the system property indicated by the specified key.
|
|
* <p>
|
|
* First, if a security manager exists, its
|
|
* <code>SecurityManager.checkPermission</code> method
|
|
* is called with a <code>PropertyPermission(key, "write")</code>
|
|
* permission. This may result in a SecurityException being thrown.
|
|
* If no exception is thrown, the specified property is set to the given
|
|
* value.
|
|
* <p>
|
|
*
|
|
* @param key the name of the system property.
|
|
* @param value the value of the system property.
|
|
* @return the previous value of the system property,
|
|
* or <code>null</code> if it did not have one.
|
|
*
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkPermission</code> method doesn't allow
|
|
* setting of the specified property.
|
|
* @exception NullPointerException if <code>key</code> or
|
|
* <code>value</code> is <code>null</code>.
|
|
* @exception IllegalArgumentException if <code>key</code> is empty.
|
|
* @see #getProperty
|
|
* @see java.lang.System#getProperty(java.lang.String)
|
|
* @see java.lang.System#getProperty(java.lang.String, java.lang.String)
|
|
* @see java.util.PropertyPermission
|
|
* @see SecurityManager#checkPermission
|
|
* @since 1.2
|
|
*/
|
|
public static String setProperty(String key, String value) {
|
|
checkKey(key);
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPermission(new PropertyPermission(key,
|
|
SecurityConstants.PROPERTY_WRITE_ACTION));
|
|
}
|
|
|
|
return (String) Props.props.setProperty(key, value);
|
|
}
|
|
|
|
/**
|
|
* Removes the system property indicated by the specified key.
|
|
* <p>
|
|
* First, if a security manager exists, its
|
|
* <code>SecurityManager.checkPermission</code> method
|
|
* is called with a <code>PropertyPermission(key, "write")</code>
|
|
* permission. This may result in a SecurityException being thrown.
|
|
* If no exception is thrown, the specified property is removed.
|
|
* <p>
|
|
*
|
|
* @param key the name of the system property to be removed.
|
|
* @return the previous string value of the system property,
|
|
* or <code>null</code> if there was no property with that key.
|
|
*
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkPropertyAccess</code> method doesn't allow
|
|
* access to the specified system property.
|
|
* @exception NullPointerException if <code>key</code> is
|
|
* <code>null</code>.
|
|
* @exception IllegalArgumentException if <code>key</code> is empty.
|
|
* @see #getProperty
|
|
* @see #setProperty
|
|
* @see java.util.Properties
|
|
* @see java.lang.SecurityException
|
|
* @see java.lang.SecurityManager#checkPropertiesAccess()
|
|
* @since 1.5
|
|
*/
|
|
public static String clearProperty(String key) {
|
|
checkKey(key);
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPermission(new PropertyPermission(key, "write"));
|
|
}
|
|
|
|
return (String) Props.props.remove(key);
|
|
}
|
|
|
|
private static void checkKey(String key) {
|
|
if (key == null) {
|
|
throw new NullPointerException("key can't be null");
|
|
}
|
|
if (key.equals("")) {
|
|
throw new IllegalArgumentException("key can't be empty");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the value of the specified environment variable. An
|
|
* environment variable is a system-dependent external named
|
|
* value.
|
|
*
|
|
* <p>If a security manager exists, its
|
|
* {@link SecurityManager#checkPermission checkPermission}
|
|
* method is called with a
|
|
* <code>{@link RuntimePermission}("getenv."+name)</code>
|
|
* permission. This may result in a {@link SecurityException}
|
|
* being thrown. If no exception is thrown the value of the
|
|
* variable <code>name</code> is returned.
|
|
*
|
|
* <p><a name="EnvironmentVSSystemProperties"><i>System
|
|
* properties</i> and <i>environment variables</i></a> are both
|
|
* conceptually mappings between names and values. Both
|
|
* mechanisms can be used to pass user-defined information to a
|
|
* Java process. Environment variables have a more global effect,
|
|
* because they are visible to all descendants of the process
|
|
* which defines them, not just the immediate Java subprocess.
|
|
* They can have subtly different semantics, such as case
|
|
* insensitivity, on different operating systems. For these
|
|
* reasons, environment variables are more likely to have
|
|
* unintended side effects. It is best to use system properties
|
|
* where possible. Environment variables should be used when a
|
|
* global effect is desired, or when an external system interface
|
|
* requires an environment variable (such as <code>PATH</code>).
|
|
*
|
|
* <p>On UNIX systems the alphabetic case of <code>name</code> is
|
|
* typically significant, while on Microsoft Windows systems it is
|
|
* typically not. For example, the expression
|
|
* <code>System.getenv("FOO").equals(System.getenv("foo"))</code>
|
|
* is likely to be true on Microsoft Windows.
|
|
*
|
|
* @param name the name of the environment variable
|
|
* @return the string value of the variable, or <code>null</code>
|
|
* if the variable is not defined in the system environment
|
|
* @throws NullPointerException if <code>name</code> is <code>null</code>
|
|
* @throws SecurityException
|
|
* if a security manager exists and its
|
|
* {@link SecurityManager#checkPermission checkPermission}
|
|
* method doesn't allow access to the environment variable
|
|
* <code>name</code>
|
|
* @see #getenv()
|
|
* @see ProcessBuilder#environment()
|
|
*/
|
|
public static String getenv(String name) {
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPermission(new RuntimePermission("getenv."+name));
|
|
}
|
|
|
|
return ProcessEnvironment.getenv(name);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an unmodifiable string map view of the current system environment.
|
|
* The environment is a system-dependent mapping from names to
|
|
* values which is passed from parent to child processes.
|
|
*
|
|
* <p>If the system does not support environment variables, an
|
|
* empty map is returned.
|
|
*
|
|
* <p>The returned map will never contain null keys or values.
|
|
* Attempting to query the presence of a null key or value will
|
|
* throw a {@link NullPointerException}. Attempting to query
|
|
* the presence of a key or value which is not of type
|
|
* {@link String} will throw a {@link ClassCastException}.
|
|
*
|
|
* <p>The returned map and its collection views may not obey the
|
|
* general contract of the {@link Object#equals} and
|
|
* {@link Object#hashCode} methods.
|
|
*
|
|
* <p>The returned map is typically case-sensitive on all platforms.
|
|
*
|
|
* <p>If a security manager exists, its
|
|
* {@link SecurityManager#checkPermission checkPermission}
|
|
* method is called with a
|
|
* <code>{@link RuntimePermission}("getenv.*")</code>
|
|
* permission. This may result in a {@link SecurityException} being
|
|
* thrown.
|
|
*
|
|
* <p>When passing information to a Java subprocess,
|
|
* <a href=#EnvironmentVSSystemProperties>system properties</a>
|
|
* are generally preferred over environment variables.
|
|
*
|
|
* @return the environment as a map of variable names to values
|
|
* @throws SecurityException
|
|
* if a security manager exists and its
|
|
* {@link SecurityManager#checkPermission checkPermission}
|
|
* method doesn't allow access to the process environment
|
|
* @see #getenv(String)
|
|
* @see ProcessBuilder#environment()
|
|
* @since 1.5
|
|
*/
|
|
public static java.util.Map<String,String> getenv() {
|
|
SecurityManager sm = getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPermission(new RuntimePermission("getenv.*"));
|
|
}
|
|
|
|
return ProcessEnvironment.getenv();
|
|
}
|
|
|
|
/**
|
|
* Terminates the currently running Java Virtual Machine. The
|
|
* argument serves as a status code; by convention, a nonzero status
|
|
* code indicates abnormal termination.
|
|
* <p>
|
|
* This method calls the <code>exit</code> method in class
|
|
* <code>Runtime</code>. This method never returns normally.
|
|
* <p>
|
|
* The call <code>System.exit(n)</code> is effectively equivalent to
|
|
* the call:
|
|
* <blockquote><pre>
|
|
* Runtime.getRuntime().exit(n)
|
|
* </pre></blockquote>
|
|
*
|
|
* @param status exit status.
|
|
* @throws SecurityException
|
|
* if a security manager exists and its <code>checkExit</code>
|
|
* method doesn't allow exit with the specified status.
|
|
* @see java.lang.Runtime#exit(int)
|
|
*/
|
|
public static void exit(int status) {
|
|
Runtime.getRuntime().exit(status);
|
|
}
|
|
|
|
/**
|
|
* Runs the garbage collector.
|
|
* <p>
|
|
* Calling the <code>gc</code> method suggests that the Java Virtual
|
|
* Machine expend effort toward recycling unused objects in order to
|
|
* make the memory they currently occupy available for quick reuse.
|
|
* When control returns from the method call, the Java Virtual
|
|
* Machine has made a best effort to reclaim space from all discarded
|
|
* objects.
|
|
* <p>
|
|
* The call <code>System.gc()</code> is effectively equivalent to the
|
|
* call:
|
|
* <blockquote><pre>
|
|
* Runtime.getRuntime().gc()
|
|
* </pre></blockquote>
|
|
*
|
|
* @see java.lang.Runtime#gc()
|
|
*/
|
|
public static void gc() {
|
|
Runtime.getRuntime().gc();
|
|
}
|
|
|
|
/**
|
|
* Runs the finalization methods of any objects pending finalization.
|
|
* <p>
|
|
* Calling this method suggests that the Java Virtual Machine expend
|
|
* effort toward running the <code>finalize</code> methods of objects
|
|
* that have been found to be discarded but whose <code>finalize</code>
|
|
* methods have not yet been run. When control returns from the
|
|
* method call, the Java Virtual Machine has made a best effort to
|
|
* complete all outstanding finalizations.
|
|
* <p>
|
|
* The call <code>System.runFinalization()</code> is effectively
|
|
* equivalent to the call:
|
|
* <blockquote><pre>
|
|
* Runtime.getRuntime().runFinalization()
|
|
* </pre></blockquote>
|
|
*
|
|
* @see java.lang.Runtime#runFinalization()
|
|
*/
|
|
public static void runFinalization() {
|
|
Runtime.getRuntime().runFinalization();
|
|
}
|
|
|
|
/**
|
|
* Enable or disable finalization on exit; doing so specifies that the
|
|
* finalizers of all objects that have finalizers that have not yet been
|
|
* automatically invoked are to be run before the Java runtime exits.
|
|
* By default, finalization on exit is disabled.
|
|
*
|
|
* <p>If there is a security manager,
|
|
* its <code>checkExit</code> method is first called
|
|
* with 0 as its argument to ensure the exit is allowed.
|
|
* This could result in a SecurityException.
|
|
*
|
|
* @deprecated This method is inherently unsafe. It may result in
|
|
* finalizers being called on live objects while other threads are
|
|
* concurrently manipulating those objects, resulting in erratic
|
|
* behavior or deadlock.
|
|
* @param value indicating enabling or disabling of finalization
|
|
* @throws SecurityException
|
|
* if a security manager exists and its <code>checkExit</code>
|
|
* method doesn't allow the exit.
|
|
*
|
|
* @see java.lang.Runtime#exit(int)
|
|
* @see java.lang.Runtime#gc()
|
|
* @see java.lang.SecurityManager#checkExit(int)
|
|
* @since JDK1.1
|
|
*/
|
|
@Deprecated
|
|
public static void runFinalizersOnExit(boolean value) {
|
|
Runtime.getRuntime().runFinalizersOnExit(value);
|
|
}
|
|
|
|
/**
|
|
* Loads a code file with the specified filename from the local file
|
|
* system as a dynamic library. The filename
|
|
* argument must be a complete path name.
|
|
* <p>
|
|
* The call <code>System.load(name)</code> is effectively equivalent
|
|
* to the call:
|
|
* <blockquote><pre>
|
|
* Runtime.getRuntime().load(name)
|
|
* </pre></blockquote>
|
|
*
|
|
* @param filename the file to load.
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkLink</code> method doesn't allow
|
|
* loading of the specified dynamic library
|
|
* @exception UnsatisfiedLinkError if the file does not exist.
|
|
* @exception NullPointerException if <code>filename</code> is
|
|
* <code>null</code>
|
|
* @see java.lang.Runtime#load(java.lang.String)
|
|
* @see java.lang.SecurityManager#checkLink(java.lang.String)
|
|
*/
|
|
@CallerSensitive
|
|
public static void load(String filename) {
|
|
Runtime.getRuntime().load0(Reflection.getCallerClass(), filename);
|
|
}
|
|
|
|
/**
|
|
* Loads the system library specified by the <code>libname</code>
|
|
* argument. The manner in which a library name is mapped to the
|
|
* actual system library is system dependent.
|
|
* <p>
|
|
* The call <code>System.loadLibrary(name)</code> is effectively
|
|
* equivalent to the call
|
|
* <blockquote><pre>
|
|
* Runtime.getRuntime().loadLibrary(name)
|
|
* </pre></blockquote>
|
|
*
|
|
* @param libname the name of the library.
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkLink</code> method doesn't allow
|
|
* loading of the specified dynamic library
|
|
* @exception UnsatisfiedLinkError if the library does not exist.
|
|
* @exception NullPointerException if <code>libname</code> is
|
|
* <code>null</code>
|
|
* @see java.lang.Runtime#loadLibrary(java.lang.String)
|
|
* @see java.lang.SecurityManager#checkLink(java.lang.String)
|
|
*/
|
|
@CallerSensitive
|
|
public static void loadLibrary(String libname) {
|
|
Runtime.getRuntime().loadLibrary0(Reflection.getCallerClass(), libname);
|
|
}
|
|
|
|
/**
|
|
* Maps a library name into a platform-specific string representing
|
|
* a native library.
|
|
*
|
|
* @param libname the name of the library.
|
|
* @return a platform-dependent native library name.
|
|
* @exception NullPointerException if <code>libname</code> is
|
|
* <code>null</code>
|
|
* @see java.lang.System#loadLibrary(java.lang.String)
|
|
* @see java.lang.ClassLoader#findLibrary(java.lang.String)
|
|
* @since 1.2
|
|
*/
|
|
public static String mapLibraryName(String libname) {
|
|
if (libname == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
if (ikvm.internal.Util.WINDOWS) {
|
|
return libname + ".dll";
|
|
} else if (ikvm.internal.Util.MACOSX) {
|
|
return "lib" + libname + ".jnilib";
|
|
} else {
|
|
return "lib" + libname + ".so";
|
|
}
|
|
}
|
|
/* returns the class of the caller. */
|
|
static Class<?> getCallerClass() {
|
|
// NOTE use of more generic Reflection.getCallerClass()
|
|
return Reflection.getCallerClass(3);
|
|
}
|
|
}
|