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430 lines
14 KiB
Java
430 lines
14 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.message;
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import ch.boye.httpclientandroidlib.HeaderElement;
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import ch.boye.httpclientandroidlib.NameValuePair;
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import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
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/**
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* Basic implementation for formatting header value elements.
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* Instances of this class are stateless and thread-safe.
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* Derived classes are expected to maintain these properties.
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*
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* @since 4.0
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*/
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public class BasicHeaderValueFormatter implements HeaderValueFormatter {
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/**
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* A default instance of this class, for use as default or fallback.
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* Note that {@link BasicHeaderValueFormatter} is not a singleton, there
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* can be many instances of the class itself and of derived classes.
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* The instance here provides non-customized, default behavior.
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*/
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public final static
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BasicHeaderValueFormatter DEFAULT = new BasicHeaderValueFormatter();
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/**
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* Special characters that can be used as separators in HTTP parameters.
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* These special characters MUST be in a quoted string to be used within
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* a parameter value .
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*/
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public final static String SEPARATORS = " ;,:@()<>\\\"/[]?={}\t";
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/**
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* Unsafe special characters that must be escaped using the backslash
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* character
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*/
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public final static String UNSAFE_CHARS = "\"\\";
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// public default constructor
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/**
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* Formats an array of header elements.
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*
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* @param elems the header elements to format
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* @param quote <code>true</code> to always format with quoted values,
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* <code>false</code> to use quotes only when necessary
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* @param formatter the formatter to use, or <code>null</code>
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* for the {@link #DEFAULT default}
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*
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* @return the formatted header elements
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*/
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public final static
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String formatElements(final HeaderElement[] elems,
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final boolean quote,
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HeaderValueFormatter formatter) {
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if (formatter == null)
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formatter = BasicHeaderValueFormatter.DEFAULT;
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return formatter.formatElements(null, elems, quote).toString();
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}
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// non-javadoc, see interface HeaderValueFormatter
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public CharArrayBuffer formatElements(CharArrayBuffer buffer,
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final HeaderElement[] elems,
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final boolean quote) {
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if (elems == null) {
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throw new IllegalArgumentException
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("Header element array must not be null.");
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}
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int len = estimateElementsLen(elems);
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if (buffer == null) {
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buffer = new CharArrayBuffer(len);
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} else {
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buffer.ensureCapacity(len);
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}
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for (int i=0; i<elems.length; i++) {
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if (i > 0) {
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buffer.append(", ");
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}
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formatHeaderElement(buffer, elems[i], quote);
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}
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return buffer;
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}
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/**
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* Estimates the length of formatted header elements.
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*
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* @param elems the header elements to format, or <code>null</code>
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*
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* @return a length estimate, in number of characters
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*/
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protected int estimateElementsLen(final HeaderElement[] elems) {
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if ((elems == null) || (elems.length < 1))
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return 0;
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int result = (elems.length-1) * 2; // elements separated by ", "
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for (int i=0; i<elems.length; i++) {
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result += estimateHeaderElementLen(elems[i]);
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}
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return result;
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}
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/**
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* Formats a header element.
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*
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* @param elem the header element to format
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* @param quote <code>true</code> to always format with quoted values,
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* <code>false</code> to use quotes only when necessary
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* @param formatter the formatter to use, or <code>null</code>
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* for the {@link #DEFAULT default}
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*
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* @return the formatted header element
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*/
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public final static
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String formatHeaderElement(final HeaderElement elem,
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boolean quote,
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HeaderValueFormatter formatter) {
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if (formatter == null)
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formatter = BasicHeaderValueFormatter.DEFAULT;
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return formatter.formatHeaderElement(null, elem, quote).toString();
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}
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// non-javadoc, see interface HeaderValueFormatter
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public CharArrayBuffer formatHeaderElement(CharArrayBuffer buffer,
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final HeaderElement elem,
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final boolean quote) {
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if (elem == null) {
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throw new IllegalArgumentException
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("Header element must not be null.");
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}
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int len = estimateHeaderElementLen(elem);
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if (buffer == null) {
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buffer = new CharArrayBuffer(len);
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} else {
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buffer.ensureCapacity(len);
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}
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buffer.append(elem.getName());
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final String value = elem.getValue();
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if (value != null) {
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buffer.append('=');
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doFormatValue(buffer, value, quote);
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}
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final int parcnt = elem.getParameterCount();
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if (parcnt > 0) {
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for (int i=0; i<parcnt; i++) {
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buffer.append("; ");
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formatNameValuePair(buffer, elem.getParameter(i), quote);
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}
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}
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return buffer;
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}
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/**
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* Estimates the length of a formatted header element.
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*
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* @param elem the header element to format, or <code>null</code>
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*
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* @return a length estimate, in number of characters
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*/
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protected int estimateHeaderElementLen(final HeaderElement elem) {
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if (elem == null)
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return 0;
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int result = elem.getName().length(); // name
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final String value = elem.getValue();
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if (value != null) {
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// assume quotes, but no escaped characters
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result += 3 + value.length(); // ="value"
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}
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final int parcnt = elem.getParameterCount();
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if (parcnt > 0) {
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for (int i=0; i<parcnt; i++) {
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result += 2 + // ; <param>
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estimateNameValuePairLen(elem.getParameter(i));
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}
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}
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return result;
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}
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/**
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* Formats a set of parameters.
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*
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* @param nvps the parameters to format
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* @param quote <code>true</code> to always format with quoted values,
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* <code>false</code> to use quotes only when necessary
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* @param formatter the formatter to use, or <code>null</code>
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* for the {@link #DEFAULT default}
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*
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* @return the formatted parameters
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*/
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public final static
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String formatParameters(final NameValuePair[] nvps,
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final boolean quote,
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HeaderValueFormatter formatter) {
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if (formatter == null)
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formatter = BasicHeaderValueFormatter.DEFAULT;
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return formatter.formatParameters(null, nvps, quote).toString();
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}
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// non-javadoc, see interface HeaderValueFormatter
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public CharArrayBuffer formatParameters(CharArrayBuffer buffer,
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NameValuePair[] nvps,
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boolean quote) {
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if (nvps == null) {
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throw new IllegalArgumentException
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("Parameters must not be null.");
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}
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int len = estimateParametersLen(nvps);
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if (buffer == null) {
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buffer = new CharArrayBuffer(len);
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} else {
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buffer.ensureCapacity(len);
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}
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for (int i = 0; i < nvps.length; i++) {
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if (i > 0) {
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buffer.append("; ");
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}
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formatNameValuePair(buffer, nvps[i], quote);
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}
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return buffer;
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}
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/**
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* Estimates the length of formatted parameters.
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*
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* @param nvps the parameters to format, or <code>null</code>
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*
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* @return a length estimate, in number of characters
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*/
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protected int estimateParametersLen(final NameValuePair[] nvps) {
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if ((nvps == null) || (nvps.length < 1))
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return 0;
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int result = (nvps.length-1) * 2; // "; " between the parameters
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for (int i=0; i<nvps.length; i++) {
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result += estimateNameValuePairLen(nvps[i]);
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}
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return result;
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}
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/**
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* Formats a name-value pair.
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*
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* @param nvp the name-value pair to format
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* @param quote <code>true</code> to always format with a quoted value,
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* <code>false</code> to use quotes only when necessary
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* @param formatter the formatter to use, or <code>null</code>
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* for the {@link #DEFAULT default}
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*
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* @return the formatted name-value pair
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*/
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public final static
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String formatNameValuePair(final NameValuePair nvp,
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final boolean quote,
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HeaderValueFormatter formatter) {
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if (formatter == null)
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formatter = BasicHeaderValueFormatter.DEFAULT;
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return formatter.formatNameValuePair(null, nvp, quote).toString();
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}
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// non-javadoc, see interface HeaderValueFormatter
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public CharArrayBuffer formatNameValuePair(CharArrayBuffer buffer,
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final NameValuePair nvp,
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final boolean quote) {
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if (nvp == null) {
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throw new IllegalArgumentException
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("NameValuePair must not be null.");
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}
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int len = estimateNameValuePairLen(nvp);
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if (buffer == null) {
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buffer = new CharArrayBuffer(len);
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} else {
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buffer.ensureCapacity(len);
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}
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buffer.append(nvp.getName());
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final String value = nvp.getValue();
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if (value != null) {
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buffer.append('=');
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doFormatValue(buffer, value, quote);
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}
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return buffer;
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}
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/**
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* Estimates the length of a formatted name-value pair.
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*
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* @param nvp the name-value pair to format, or <code>null</code>
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*
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* @return a length estimate, in number of characters
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*/
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protected int estimateNameValuePairLen(final NameValuePair nvp) {
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if (nvp == null)
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return 0;
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int result = nvp.getName().length(); // name
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final String value = nvp.getValue();
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if (value != null) {
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// assume quotes, but no escaped characters
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result += 3 + value.length(); // ="value"
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}
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return result;
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}
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/**
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* Actually formats the value of a name-value pair.
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* This does not include a leading = character.
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* Called from {@link #formatNameValuePair formatNameValuePair}.
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*
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* @param buffer the buffer to append to, never <code>null</code>
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* @param value the value to append, never <code>null</code>
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* @param quote <code>true</code> to always format with quotes,
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* <code>false</code> to use quotes only when necessary
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*/
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protected void doFormatValue(final CharArrayBuffer buffer,
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final String value,
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boolean quote) {
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if (!quote) {
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for (int i = 0; (i < value.length()) && !quote; i++) {
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quote = isSeparator(value.charAt(i));
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}
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}
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if (quote) {
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buffer.append('"');
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}
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for (int i = 0; i < value.length(); i++) {
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char ch = value.charAt(i);
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if (isUnsafe(ch)) {
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buffer.append('\\');
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}
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buffer.append(ch);
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}
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if (quote) {
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buffer.append('"');
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}
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}
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/**
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* Checks whether a character is a {@link #SEPARATORS separator}.
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*
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* @param ch the character to check
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*
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* @return <code>true</code> if the character is a separator,
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* <code>false</code> otherwise
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*/
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protected boolean isSeparator(char ch) {
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return SEPARATORS.indexOf(ch) >= 0;
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}
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/**
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* Checks whether a character is {@link #UNSAFE_CHARS unsafe}.
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*
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* @param ch the character to check
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*
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* @return <code>true</code> if the character is unsafe,
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* <code>false</code> otherwise
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*/
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protected boolean isUnsafe(char ch) {
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return UNSAFE_CHARS.indexOf(ch) >= 0;
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}
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} // class BasicHeaderValueFormatter
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