2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.vm4brwsr;
20 import java.io.IOException;
21 import java.io.InputStream;
22 import java.util.HashMap;
24 import org.apidesign.bck2brwsr.core.ExtraJavaScript;
25 import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
26 import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
27 import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
29 @ExtraJavaScript(processByteCode = false, resource="")
30 final class ClassDataCache {
31 private static final Object MISSING_CLASS = new Object();
33 private final Bck2Brwsr.Resources resources;
34 private final Map<String, Object> classDataMap;
36 ClassDataCache(final Bck2Brwsr.Resources resources) {
37 this.resources = resources;
39 classDataMap = new HashMap<String, Object>();
42 ClassData getClassData(String className) throws IOException {
43 if (className.startsWith("[")) {
44 // required for accessVirtualMethod, shouldn't be problematic for
45 // calls from other sources
46 className = "java/lang/Object";
48 Object cacheEntry = classDataMap.get(className);
49 if (cacheEntry == null) {
50 final InputStream is = loadClass(resources, className);
51 cacheEntry = (is != null) ? new ClassData(is) : MISSING_CLASS;
52 classDataMap.put(className, cacheEntry);
55 return (cacheEntry != MISSING_CLASS) ? (ClassData) cacheEntry : null;
58 MethodData findMethod(final String startingClass,
60 final String signature) throws IOException {
61 return findMethod(getClassData(startingClass), name, signature);
64 FieldData findField(final String startingClass,
66 final String signature) throws IOException {
67 return findField(getClassData(startingClass), name, signature);
70 MethodData findMethod(final ClassData startingClass,
72 final String signature) throws IOException {
73 final FindFirstTraversalCallback<MethodData> ffTraversalCallback =
74 new FindFirstTraversalCallback<MethodData>();
76 findMethods(startingClass, name, signature, ffTraversalCallback);
77 return ffTraversalCallback.getFirst();
80 FieldData findField(final ClassData startingClass,
82 final String signature) throws IOException {
83 final FindFirstTraversalCallback<FieldData> ffTraversalCallback =
84 new FindFirstTraversalCallback<FieldData>();
86 findFields(startingClass, name, signature, ffTraversalCallback);
87 return ffTraversalCallback.getFirst();
90 void findMethods(final ClassData startingClass,
91 final String methodName,
92 final String methodSignature,
93 final TraversalCallback<MethodData> mdTraversalCallback)
97 new FindMethodsTraversalCallback(methodName, methodSignature,
98 mdTraversalCallback));
101 void findFields(final ClassData startingClass,
102 final String fieldName,
103 final String fieldSignature,
104 final TraversalCallback<FieldData> fdTraversalCallback)
108 new FindFieldsTraversalCallback(fieldName, fieldSignature,
109 fdTraversalCallback));
112 private boolean traverseHierarchy(
113 ClassData currentClass,
114 final TraversalCallback<ClassData> cdTraversalCallback)
116 while (currentClass != null) {
117 if (!cdTraversalCallback.traverse(currentClass)) {
121 for (final String superIfaceName:
122 currentClass.getSuperInterfaces()) {
123 if (!traverseHierarchy(getClassData(superIfaceName),
124 cdTraversalCallback)) {
129 final String superClassName = currentClass.getSuperClassName();
130 if (superClassName == null) {
134 currentClass = getClassData(superClassName);
140 interface TraversalCallback<T> {
141 boolean traverse(T object);
144 private final class FindFirstTraversalCallback<T>
145 implements TraversalCallback<T> {
146 private T firstObject;
149 public boolean traverse(final T object) {
150 firstObject = object;
154 public T getFirst() {
159 private final class FindMethodsTraversalCallback
160 implements TraversalCallback<ClassData> {
161 private final String methodName;
162 private final String methodSignature;
163 private final TraversalCallback<MethodData> mdTraversalCallback;
165 public FindMethodsTraversalCallback(
166 final String methodName,
167 final String methodSignature,
168 final TraversalCallback<MethodData> mdTraversalCallback) {
169 this.methodName = methodName;
170 this.methodSignature = methodSignature;
171 this.mdTraversalCallback = mdTraversalCallback;
175 public boolean traverse(final ClassData classData) {
176 final MethodData methodData =
177 classData.findMethod(methodName, methodSignature);
178 return (methodData != null)
179 ? mdTraversalCallback.traverse(methodData)
184 private final class FindFieldsTraversalCallback
185 implements TraversalCallback<ClassData> {
186 private final String fieldName;
187 private final String fieldSignature;
188 private final TraversalCallback<FieldData> fdTraversalCallback;
190 public FindFieldsTraversalCallback(
191 final String fieldName,
192 final String fieldSignature,
193 final TraversalCallback<FieldData> fdTraversalCallback) {
194 this.fieldName = fieldName;
195 this.fieldSignature = fieldSignature;
196 this.fdTraversalCallback = fdTraversalCallback;
200 public boolean traverse(final ClassData classData) {
201 final FieldData fieldData =
202 classData.findField(fieldName, fieldSignature);
203 return (fieldData != null)
204 ? fdTraversalCallback.traverse(fieldData)
209 private static InputStream loadClass(Bck2Brwsr.Resources l, String name)
211 return l.get(name + ".class"); // NOI18N