001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.util; 019 020import java.io.IOException; 021import java.io.InputStream; 022import java.util.HashMap; 023import java.util.Map; 024 025import org.apache.bcel.classfile.ClassParser; 026import org.apache.bcel.classfile.JavaClass; 027 028/** 029 * The repository maintains information about which classes have been loaded. 030 * 031 * It loads its data from the ClassLoader implementation passed into its constructor. 032 * 033 * @see org.apache.bcel.Repository 034 * 035 */ 036public class ClassLoaderRepository implements Repository { 037 038 private final java.lang.ClassLoader loader; 039 private final Map<String, JavaClass> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS 040 041 public ClassLoaderRepository(final java.lang.ClassLoader loader) { 042 this.loader = loader; 043 } 044 045 /** 046 * Clear all entries from cache. 047 */ 048 @Override 049 public void clear() { 050 loadedClasses.clear(); 051 } 052 053 /** 054 * Find an already defined JavaClass. 055 */ 056 @Override 057 public JavaClass findClass(final String className) { 058 return loadedClasses.get(className); 059 } 060 061 /* 062 * @return null 063 */ 064 @Override 065 public ClassPath getClassPath() { 066 return null; 067 } 068 069 @Override 070 public JavaClass loadClass(final Class<?> clazz) throws ClassNotFoundException { 071 return loadClass(clazz.getName()); 072 } 073 074 /** 075 * Lookup a JavaClass object from the Class Name provided. 076 */ 077 @Override 078 public JavaClass loadClass(final String className) throws ClassNotFoundException { 079 final String classFile = className.replace('.', '/'); 080 JavaClass RC = findClass(className); 081 if (RC != null) { 082 return RC; 083 } 084 try (InputStream is = loader.getResourceAsStream(classFile + ".class")) { 085 if (is == null) { 086 throw new ClassNotFoundException(className + " not found."); 087 } 088 final ClassParser parser = new ClassParser(is, className); 089 RC = parser.parse(); 090 storeClass(RC); 091 return RC; 092 } catch (final IOException e) { 093 throw new ClassNotFoundException(className + " not found: " + e, e); 094 } 095 } 096 097 /** 098 * Remove class from repository 099 */ 100 @Override 101 public void removeClass(final JavaClass clazz) { 102 loadedClasses.remove(clazz.getClassName()); 103 } 104 105 /** 106 * Store a new JavaClass into this Repository. 107 */ 108 @Override 109 public void storeClass(final JavaClass clazz) { 110 loadedClasses.put(clazz.getClassName(), clazz); 111 clazz.setRepository(this); 112 } 113}