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 030 * been loaded. 031 * 032 * It loads its data from the ClassLoader implementation 033 * passed into its constructor. 034 * 035 * @see org.apache.bcel.Repository 036 * 037 */ 038public class ClassLoaderRepository implements Repository { 039 040 private final java.lang.ClassLoader loader; 041 private final Map<String, JavaClass> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS 042 043 044 public ClassLoaderRepository(final java.lang.ClassLoader loader) { 045 this.loader = loader; 046 } 047 048 049 /** 050 * Store a new JavaClass into this Repository. 051 */ 052 @Override 053 public void storeClass( final JavaClass clazz ) { 054 loadedClasses.put(clazz.getClassName(), clazz); 055 clazz.setRepository(this); 056 } 057 058 059 /** 060 * Remove class from repository 061 */ 062 @Override 063 public void removeClass( final JavaClass clazz ) { 064 loadedClasses.remove(clazz.getClassName()); 065 } 066 067 068 /** 069 * Find an already defined JavaClass. 070 */ 071 @Override 072 public JavaClass findClass( final String className ) { 073 return loadedClasses.containsKey(className) ? loadedClasses.get(className) : null; 074 } 075 076 077 /** 078 * Lookup a JavaClass object from the Class Name provided. 079 */ 080 @Override 081 public JavaClass loadClass(final String className) throws ClassNotFoundException { 082 final String classFile = className.replace('.', '/'); 083 JavaClass RC = findClass(className); 084 if (RC != null) { 085 return RC; 086 } 087 try (InputStream is = loader.getResourceAsStream(classFile + ".class")) { 088 if (is == null) { 089 throw new ClassNotFoundException(className + " not found."); 090 } 091 final ClassParser parser = new ClassParser(is, className); 092 RC = parser.parse(); 093 storeClass(RC); 094 return RC; 095 } catch (final IOException e) { 096 throw new ClassNotFoundException(className + " not found: " + e, e); 097 } 098 } 099 100 101 @Override 102 public JavaClass loadClass( final Class<?> clazz ) throws ClassNotFoundException { 103 return loadClass(clazz.getName()); 104 } 105 106 107 /** Clear all entries from cache. 108 */ 109 @Override 110 public void clear() { 111 loadedClasses.clear(); 112 } 113 114 115 /* 116 * @return null 117 */ 118 @Override 119 public ClassPath getClassPath() { 120 return null; 121 } 122}