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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.vm4brwsr;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.Map;
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import org.apidesign.bck2brwsr.core.ExtraJavaScript;
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import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
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import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
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import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
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@ExtraJavaScript(processByteCode = false, resource="")
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final class ClassDataCache {
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private static final Object MISSING_CLASS = new Object();
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private final Bck2Brwsr.Resources resources;
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private final Map<String, Object> classDataMap;
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ClassDataCache(final Bck2Brwsr.Resources resources) {
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this.resources = resources;
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classDataMap = new HashMap<String, Object>();
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}
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ClassData getClassData(String className) throws IOException {
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if (className.startsWith("[")) {
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// required for accessVirtualMethod, shouldn't be problematic for
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// calls from other sources
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className = "java/lang/Object";
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}
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Object cacheEntry = classDataMap.get(className);
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if (cacheEntry == null) {
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final InputStream is = loadClass(resources, className);
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cacheEntry = (is != null) ? new ClassData(is) : MISSING_CLASS;
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classDataMap.put(className, cacheEntry);
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}
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return (cacheEntry != MISSING_CLASS) ? (ClassData) cacheEntry : null;
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}
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MethodData findMethod(final String startingClass,
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final String name,
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final String signature) throws IOException {
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return findMethod(getClassData(startingClass), name, signature);
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}
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FieldData findField(final String startingClass,
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final String name,
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final String signature) throws IOException {
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return findField(getClassData(startingClass), name, signature);
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}
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MethodData findMethod(final ClassData startingClass,
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final String name,
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final String signature) throws IOException {
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final FindFirstTraversalCallback<MethodData> ffTraversalCallback =
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new FindFirstTraversalCallback<MethodData>();
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findMethods(startingClass, name, signature, ffTraversalCallback);
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return ffTraversalCallback.getFirst();
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}
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FieldData findField(final ClassData startingClass,
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final String name,
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final String signature) throws IOException {
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final FindFirstTraversalCallback<FieldData> ffTraversalCallback =
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new FindFirstTraversalCallback<FieldData>();
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findFields(startingClass, name, signature, ffTraversalCallback);
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return ffTraversalCallback.getFirst();
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}
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void findMethods(final ClassData startingClass,
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final String methodName,
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final String methodSignature,
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final TraversalCallback<MethodData> mdTraversalCallback)
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throws IOException {
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traverseHierarchy(
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startingClass,
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new FindMethodsTraversalCallback(methodName, methodSignature,
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mdTraversalCallback));
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}
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void findFields(final ClassData startingClass,
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final String fieldName,
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final String fieldSignature,
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final TraversalCallback<FieldData> fdTraversalCallback)
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throws IOException {
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traverseHierarchy(
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startingClass,
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new FindFieldsTraversalCallback(fieldName, fieldSignature,
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fdTraversalCallback));
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}
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private boolean traverseHierarchy(
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ClassData currentClass,
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final TraversalCallback<ClassData> cdTraversalCallback)
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throws IOException {
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while (currentClass != null) {
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if (!cdTraversalCallback.traverse(currentClass)) {
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return false;
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}
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for (final String superIfaceName:
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currentClass.getSuperInterfaces()) {
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if (!traverseHierarchy(getClassData(superIfaceName),
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cdTraversalCallback)) {
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return false;
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}
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}
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final String superClassName = currentClass.getSuperClassName();
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if (superClassName == null) {
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break;
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}
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currentClass = getClassData(superClassName);
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}
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return true;
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}
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interface TraversalCallback<T> {
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boolean traverse(T object);
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}
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private final class FindFirstTraversalCallback<T>
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implements TraversalCallback<T> {
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private T firstObject;
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@Override
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public boolean traverse(final T object) {
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firstObject = object;
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return false;
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}
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public T getFirst() {
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return firstObject;
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}
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}
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private final class FindMethodsTraversalCallback
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implements TraversalCallback<ClassData> {
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private final String methodName;
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private final String methodSignature;
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private final TraversalCallback<MethodData> mdTraversalCallback;
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public FindMethodsTraversalCallback(
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final String methodName,
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final String methodSignature,
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final TraversalCallback<MethodData> mdTraversalCallback) {
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this.methodName = methodName;
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this.methodSignature = methodSignature;
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this.mdTraversalCallback = mdTraversalCallback;
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}
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@Override
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public boolean traverse(final ClassData classData) {
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final MethodData methodData =
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classData.findMethod(methodName, methodSignature);
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return (methodData != null)
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? mdTraversalCallback.traverse(methodData)
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: true;
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}
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}
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private final class FindFieldsTraversalCallback
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implements TraversalCallback<ClassData> {
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private final String fieldName;
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private final String fieldSignature;
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private final TraversalCallback<FieldData> fdTraversalCallback;
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public FindFieldsTraversalCallback(
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final String fieldName,
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final String fieldSignature,
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final TraversalCallback<FieldData> fdTraversalCallback) {
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this.fieldName = fieldName;
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this.fieldSignature = fieldSignature;
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this.fdTraversalCallback = fdTraversalCallback;
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}
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@Override
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public boolean traverse(final ClassData classData) {
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final FieldData fieldData =
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classData.findField(fieldName, fieldSignature);
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return (fieldData != null)
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? fdTraversalCallback.traverse(fieldData)
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: true;
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}
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}
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private static InputStream loadClass(Bck2Brwsr.Resources l, String name)
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throws IOException {
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return l.get(name + ".class"); // NOI18N
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}
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}
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