lubomir@1084: /**
lubomir@1084:  * Back 2 Browser Bytecode Translator
lubomir@1084:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
lubomir@1084:  *
lubomir@1084:  * This program is free software: you can redistribute it and/or modify
lubomir@1084:  * it under the terms of the GNU General Public License as published by
lubomir@1084:  * the Free Software Foundation, version 2 of the License.
lubomir@1084:  *
lubomir@1084:  * This program is distributed in the hope that it will be useful,
lubomir@1084:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
lubomir@1084:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
lubomir@1084:  * GNU General Public License for more details.
lubomir@1084:  *
lubomir@1084:  * You should have received a copy of the GNU General Public License
lubomir@1084:  * along with this program. Look for COPYING file in the top folder.
lubomir@1084:  * If not, see http://opensource.org/licenses/GPL-2.0.
lubomir@1084:  */
lubomir@1084: package org.apidesign.vm4brwsr;
lubomir@1084: 
lubomir@1084: import java.io.IOException;
lubomir@1084: import java.io.InputStream;
lubomir@1084: import java.util.HashMap;
lubomir@1084: import java.util.Map;
lubomir@1084: import org.apidesign.bck2brwsr.core.ExtraJavaScript;
lubomir@1084: import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
lubomir@1085: import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
lubomir@1085: import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
lubomir@1084: 
lubomir@1084: @ExtraJavaScript(processByteCode = false, resource="")
lubomir@1084: final class ClassDataCache {
lubomir@1084:     private static final Object MISSING_CLASS = new Object();
lubomir@1084: 
lubomir@1084:     private final Bck2Brwsr.Resources resources;
lubomir@1084:     private final Map<String, Object> classDataMap;
lubomir@1084: 
lubomir@1084:     ClassDataCache(final Bck2Brwsr.Resources resources) {
lubomir@1084:         this.resources = resources;
lubomir@1084: 
lubomir@1084:         classDataMap = new HashMap<String, Object>();
lubomir@1084:     }
lubomir@1084: 
lubomir@1085:     ClassData getClassData(String className) throws IOException {
lubomir@1085:         if (className.startsWith("[")) {
lubomir@1085:             // required for accessVirtualMethod, shouldn't be problematic for
lubomir@1085:             // calls from other sources
lubomir@1085:             className = "java/lang/Object";
lubomir@1085:         }
lubomir@1084:         Object cacheEntry = classDataMap.get(className);
lubomir@1084:         if (cacheEntry == null) {
lubomir@1084:             final InputStream is = loadClass(resources, className);
lubomir@1084:             cacheEntry = (is != null) ? new ClassData(is) : MISSING_CLASS;
lubomir@1084:             classDataMap.put(className, cacheEntry);
lubomir@1084:         }
lubomir@1084: 
lubomir@1084:         return (cacheEntry != MISSING_CLASS) ? (ClassData) cacheEntry : null;
lubomir@1084:     }
lubomir@1084: 
lubomir@1085:     MethodData findMethod(final String startingClass,
lubomir@1085:                           final String name,
lubomir@1085:                           final String signature) throws IOException {
lubomir@1085:         return findMethod(getClassData(startingClass), name, signature);
lubomir@1085:     }
lubomir@1085: 
lubomir@1085:     FieldData findField(final String startingClass,
lubomir@1085:                         final String name,
lubomir@1085:                         final String signature) throws IOException {
lubomir@1085:         return findField(getClassData(startingClass), name, signature);
lubomir@1085:     }
lubomir@1085: 
lubomir@1085:     MethodData findMethod(ClassData currentClass,
lubomir@1085:                           final String name,
lubomir@1085:                           final String signature) throws IOException {
lubomir@1085:         while (currentClass != null) {
lubomir@1085:             final MethodData methodData =
lubomir@1085:                     currentClass.findMethod(name, signature);
lubomir@1085:             if (methodData != null) {
lubomir@1085:                 return methodData;
lubomir@1085:             }
lubomir@1085: 
lubomir@1085:             final String superClassName = currentClass.getSuperClassName();
lubomir@1085:             if (superClassName == null) {
lubomir@1085:                 break;
lubomir@1085:             }
lubomir@1085:             currentClass = getClassData(superClassName);
lubomir@1085:         }
lubomir@1085: 
lubomir@1085:         return null;
lubomir@1085:     }
lubomir@1085: 
lubomir@1085:     FieldData findField(ClassData currentClass,
lubomir@1085:                         final String name,
lubomir@1085:                         final String signature) throws IOException {
lubomir@1085:         while (currentClass != null) {
lubomir@1085:             final FieldData fieldData =
lubomir@1085:                     currentClass.findField(name, signature);
lubomir@1085:             if (fieldData != null) {
lubomir@1085:                 return fieldData;
lubomir@1085:             }
lubomir@1085: 
lubomir@1085:             final String superClassName = currentClass.getSuperClassName();
lubomir@1085:             if (superClassName == null) {
lubomir@1085:                 break;
lubomir@1085:             }
lubomir@1085:             currentClass = getClassData(superClassName);
lubomir@1085:         }
lubomir@1085: 
lubomir@1085:         return null;
lubomir@1085:     }
lubomir@1085: 
lubomir@1084:     private static InputStream loadClass(Bck2Brwsr.Resources l, String name)
lubomir@1084:             throws IOException {
lubomir@1084:         return l.get(name + ".class"); // NOI18N
lubomir@1084:     }
lubomir@1084: }