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422 lines
14 KiB
C
422 lines
14 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* This file is part of the Java-vendor-neutral implementation of LiveConnect
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*
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* It contains the code used to reflect Java fields as properties of
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* JavaObject objects and the code to access those fields.
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*
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*/
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#include <stdlib.h>
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#include "jsj_private.h" /* LiveConnect internals */
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/*
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* Add a single field, described by java_field, to the JavaMemberDescriptor
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* named by field_name within the given JavaClassDescriptor.
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*
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* Returns JS_TRUE on success. Otherwise, returns JS_FALSE and reports an error.
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*/
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static JSBool
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add_java_field_to_class_descriptor(JSContext *cx,
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JNIEnv *jEnv,
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JavaClassDescriptor *class_descriptor,
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jstring field_name_jstr,
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jobject java_field, /* a java.lang.reflect.Field */
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jint modifiers)
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{
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jclass fieldType;
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jfieldID fieldID;
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jclass java_class;
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JSBool is_static_field;
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JavaMemberDescriptor *member_descriptor = NULL;
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const char *sig_cstr = NULL;
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const char *field_name = NULL;
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JavaSignature *signature = NULL;
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JavaFieldSpec *field_spec = NULL;
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is_static_field = modifiers & ACC_STATIC;
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if (is_static_field) {
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member_descriptor = jsj_GetJavaStaticMemberDescriptor(cx, jEnv, class_descriptor, field_name_jstr);
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} else {
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member_descriptor = jsj_GetJavaMemberDescriptor(cx, jEnv, class_descriptor, field_name_jstr);
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}
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if (!member_descriptor)
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goto error;
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field_spec = (JavaFieldSpec*)JS_malloc(cx, sizeof(JavaFieldSpec));
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if (!field_spec)
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goto error;
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field_spec->modifiers = modifiers;
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/* Get the Java class corresponding to the type of the field */
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fieldType = (*jEnv)->CallObjectMethod(jEnv, java_field, jlrField_getType);
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if (!fieldType) {
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jsj_UnexpectedJavaError(cx, jEnv,
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"Unable to determine type of field using"
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" java.lang.reflect.Field.getType()");
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goto error;
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}
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signature = jsj_GetJavaClassDescriptor(cx, jEnv, fieldType);
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(*jEnv)->DeleteLocalRef(jEnv, fieldType);
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if (!signature)
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goto error;
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field_spec->signature = signature;
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field_name = jsj_DupJavaStringUTF(cx, jEnv, field_name_jstr);
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if (!field_name)
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goto error;
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field_spec->name = field_name;
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/* Compute the JNI-style (string-based) signature of the field type */
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sig_cstr = jsj_ConvertJavaSignatureToString(cx, signature);
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if (!sig_cstr)
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goto error;
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/* Compute the JNI fieldID and cache it for quick field access */
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java_class = class_descriptor->java_class;
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if (is_static_field)
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fieldID = (*jEnv)->GetStaticFieldID(jEnv, java_class, field_name, sig_cstr);
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else
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fieldID = (*jEnv)->GetFieldID(jEnv, java_class, field_name, sig_cstr);
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if (!fieldID) {
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jsj_UnexpectedJavaError(cx, jEnv,
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"Can't get Java field ID for class %s, field %s (sig=%s)",
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class_descriptor->name, field_name, sig_cstr);
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goto error;
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}
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field_spec->fieldID = fieldID;
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JS_free(cx, (char*)sig_cstr);
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member_descriptor->field = field_spec;
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/* Success */
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return JS_TRUE;
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error:
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if (field_spec) {
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JS_FREE_IF(cx, (char*)field_spec->name);
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JS_free(cx, field_spec);
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}
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JS_FREE_IF(cx, (char*)sig_cstr);
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if (signature)
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jsj_ReleaseJavaClassDescriptor(cx, jEnv, signature);
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return JS_FALSE;
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}
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/*
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* Free up a JavaFieldSpec and all its resources.
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*/
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void
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jsj_DestroyFieldSpec(JSContext *cx, JNIEnv *jEnv, JavaFieldSpec *field)
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{
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JS_FREE_IF(cx, (char*)field->name);
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jsj_ReleaseJavaClassDescriptor(cx, jEnv, field->signature);
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JS_free(cx, field);
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}
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/*
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* Add a JavaMemberDescriptor to the collection of members in class_descriptor
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* for every public field of the identified Java class. (A separate collection
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* is kept in class_descriptor for static and instance members.)
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* If reflect_only_static_fields is set, instance fields are not reflected. If
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* it isn't set, only instance fields are reflected and static fields are not
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* reflected.
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*
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* Returns JS_TRUE on success. Otherwise, returns JS_FALSE and reports an error.
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*/
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JSBool
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jsj_ReflectJavaFields(JSContext *cx, JNIEnv *jEnv, JavaClassDescriptor *class_descriptor,
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JSBool reflect_only_static_fields)
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{
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int i;
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JSBool ok;
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jint modifiers;
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jobject java_field;
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jstring field_name_jstr;
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jarray joFieldArray;
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jsize num_fields;
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jclass java_class;
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/* Get a java array of java.lang.reflect.Field objects, by calling
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java.lang.Class.getFields(). */
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java_class = class_descriptor->java_class;
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joFieldArray = (*jEnv)->CallObjectMethod(jEnv, java_class, jlClass_getFields);
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if (!joFieldArray) {
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jsj_UnexpectedJavaError(cx, jEnv,
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"Can't determine Java object's fields "
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"using java.lang.Class.getFields()");
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return JS_FALSE;
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}
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/* Iterate over the class fields */
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num_fields = (*jEnv)->GetArrayLength(jEnv, joFieldArray);
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for (i = 0; i < num_fields; i++) {
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/* Get the i'th reflected field */
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java_field = (*jEnv)->GetObjectArrayElement(jEnv, joFieldArray, i);
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if (!java_field) {
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jsj_UnexpectedJavaError(cx, jEnv, "Can't access a Field[] array");
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return JS_FALSE;
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}
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/* Get the field modifiers, e.g. static, public, private, etc. */
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modifiers = (*jEnv)->CallIntMethod(jEnv, java_field, jlrField_getModifiers);
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if ((*jEnv)->ExceptionOccurred(jEnv)) {
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jsj_UnexpectedJavaError(cx, jEnv,
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"Can't access a Field's modifiers using"
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"java.lang.reflect.Field.getModifiers()");
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return JS_FALSE;
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}
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/* Don't allow access to private or protected Java fields. */
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if (!(modifiers & ACC_PUBLIC))
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goto no_reflect;
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/* Reflect all instance fields or all static fields, but not both */
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if (reflect_only_static_fields != ((modifiers & ACC_STATIC) != 0))
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goto no_reflect;
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/* Determine the unqualified name of the field */
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field_name_jstr = (*jEnv)->CallObjectMethod(jEnv, java_field, jlrField_getName);
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if (!field_name_jstr) {
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jsj_UnexpectedJavaError(cx, jEnv,
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"Can't obtain a Field's name"
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"java.lang.reflect.Field.getName()");
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return JS_FALSE;
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}
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/* Add a JavaFieldSpec object to the JavaClassDescriptor */
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ok = add_java_field_to_class_descriptor(cx, jEnv, class_descriptor, field_name_jstr,
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java_field, modifiers);
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if (!ok)
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return JS_FALSE;
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(*jEnv)->DeleteLocalRef(jEnv, field_name_jstr);
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field_name_jstr = NULL;
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no_reflect:
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(*jEnv)->DeleteLocalRef(jEnv, java_field);
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java_field = NULL;
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}
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(*jEnv)->DeleteLocalRef(jEnv, joFieldArray);
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/* Success */
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return JS_TRUE;
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}
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/*
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* Read the value of a Java field and return it as a JavaScript value.
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* If the field is static, then java_obj is a Java class, otherwise
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* it's a Java instance object.
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*
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* Returns JS_TRUE on success. Otherwise, returns JS_FALSE and reports an error.
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*/
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JSBool
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jsj_GetJavaFieldValue(JSContext *cx, JNIEnv *jEnv, JavaFieldSpec *field_spec,
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jobject java_obj, jsval *vp)
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{
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JSBool is_static_field, success;
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jvalue java_value;
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JavaSignature *signature;
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JavaSignatureChar field_type;
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jfieldID fieldID = field_spec->fieldID;
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is_static_field = field_spec->modifiers & ACC_STATIC;
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#define GET_JAVA_FIELD(Type,member) \
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JS_BEGIN_MACRO \
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if (is_static_field) \
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java_value.member = \
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(*jEnv)->GetStatic##Type##Field(jEnv, (*jEnv)->GetObjectClass(jEnv, java_obj), fieldID); \
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else \
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java_value.member = \
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(*jEnv)->Get##Type##Field(jEnv, java_obj, fieldID); \
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if ((*jEnv)->ExceptionOccurred(jEnv)) { \
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jsj_UnexpectedJavaError(cx, jEnv, "Error reading Java field"); \
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return JS_FALSE; \
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} \
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JS_END_MACRO
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signature = field_spec->signature;
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field_type = signature->type;
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switch(field_type) {
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case JAVA_SIGNATURE_BYTE:
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GET_JAVA_FIELD(Byte,b);
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break;
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case JAVA_SIGNATURE_CHAR:
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GET_JAVA_FIELD(Char,c);
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break;
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case JAVA_SIGNATURE_SHORT:
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GET_JAVA_FIELD(Short,s);
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break;
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case JAVA_SIGNATURE_INT:
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GET_JAVA_FIELD(Int,i);
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break;
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case JAVA_SIGNATURE_BOOLEAN:
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GET_JAVA_FIELD(Boolean,z);
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break;
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case JAVA_SIGNATURE_LONG:
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GET_JAVA_FIELD(Long,j);
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break;
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case JAVA_SIGNATURE_FLOAT:
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GET_JAVA_FIELD(Float,f);
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break;
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case JAVA_SIGNATURE_DOUBLE:
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GET_JAVA_FIELD(Double,d);
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break;
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case JAVA_SIGNATURE_UNKNOWN:
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case JAVA_SIGNATURE_VOID:
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JS_ASSERT(0); /* Unknown java type signature */
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return JS_FALSE;
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/* Non-primitive (reference) type */
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default:
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JS_ASSERT(IS_REFERENCE_TYPE(field_type));
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GET_JAVA_FIELD(Object,l);
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success = jsj_ConvertJavaObjectToJSValue(cx, jEnv, java_value.l, vp);
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(*jEnv)->DeleteLocalRef(jEnv, java_value.l);
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return success;
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}
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#undef GET_JAVA_FIELD
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return jsj_ConvertJavaValueToJSValue(cx, jEnv, signature, &java_value, vp);
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}
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JSBool
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jsj_SetJavaFieldValue(JSContext *cx, JNIEnv *jEnv, JavaFieldSpec *field_spec,
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jclass java_obj, jsval js_val)
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{
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JSBool is_static_field, is_local_ref;
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int dummy_cost;
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jvalue java_value;
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JavaSignature *signature;
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JavaSignatureChar field_type;
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jfieldID fieldID = field_spec->fieldID;
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is_static_field = field_spec->modifiers & ACC_STATIC;
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#define SET_JAVA_FIELD(Type,member) \
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JS_BEGIN_MACRO \
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if (is_static_field) { \
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(*jEnv)->SetStatic##Type##Field(jEnv, java_obj, fieldID, \
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java_value.member); \
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} else { \
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(*jEnv)->Set##Type##Field(jEnv, java_obj, fieldID,java_value.member);\
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} \
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if ((*jEnv)->ExceptionOccurred(jEnv)) { \
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jsj_UnexpectedJavaError(cx, jEnv, "Error assigning to Java field"); \
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return JS_FALSE; \
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} \
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JS_END_MACRO
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signature = field_spec->signature;
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if (!jsj_ConvertJSValueToJavaValue(cx, jEnv, js_val, signature, &dummy_cost,
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&java_value, &is_local_ref))
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return JS_FALSE;
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field_type = signature->type;
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switch(field_type) {
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case JAVA_SIGNATURE_BYTE:
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SET_JAVA_FIELD(Byte,b);
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break;
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case JAVA_SIGNATURE_CHAR:
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SET_JAVA_FIELD(Char,c);
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break;
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case JAVA_SIGNATURE_SHORT:
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SET_JAVA_FIELD(Short,s);
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break;
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case JAVA_SIGNATURE_INT:
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SET_JAVA_FIELD(Int,i);
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break;
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case JAVA_SIGNATURE_BOOLEAN:
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SET_JAVA_FIELD(Boolean,z);
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break;
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case JAVA_SIGNATURE_LONG:
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SET_JAVA_FIELD(Long,j);
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break;
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case JAVA_SIGNATURE_FLOAT:
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SET_JAVA_FIELD(Float,f);
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break;
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case JAVA_SIGNATURE_DOUBLE:
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SET_JAVA_FIELD(Double,d);
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break;
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/* Non-primitive (reference) type */
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default:
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JS_ASSERT(IS_REFERENCE_TYPE(field_type));
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SET_JAVA_FIELD(Object,l);
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if (is_local_ref)
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(*jEnv)->DeleteLocalRef(jEnv, java_value.l);
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break;
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case JAVA_SIGNATURE_UNKNOWN:
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case JAVA_SIGNATURE_VOID:
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JS_ASSERT(0); /* Unknown java type signature */
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return JS_FALSE;
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}
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#undef SET_JAVA_FIELD
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return JS_TRUE;
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}
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