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 * @version $Id: ClassLoaderRepository.java 1749603 2016-06-21 20:50:19Z ggregory $ 038 */ 039public class ClassLoaderRepository implements Repository { 040 041 private final java.lang.ClassLoader loader; 042 private final Map<String, JavaClass> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS 043 044 045 public ClassLoaderRepository(final java.lang.ClassLoader loader) { 046 this.loader = loader; 047 } 048 049 050 /** 051 * Store a new JavaClass into this Repository. 052 */ 053 @Override 054 public void storeClass( final JavaClass clazz ) { 055 loadedClasses.put(clazz.getClassName(), clazz); 056 clazz.setRepository(this); 057 } 058 059 060 /** 061 * Remove class from repository 062 */ 063 @Override 064 public void removeClass( final JavaClass clazz ) { 065 loadedClasses.remove(clazz.getClassName()); 066 } 067 068 069 /** 070 * Find an already defined JavaClass. 071 */ 072 @Override 073 public JavaClass findClass( final String className ) { 074 return loadedClasses.containsKey(className) ? loadedClasses.get(className) : null; 075 } 076 077 078 /** 079 * Lookup a JavaClass object from the Class Name provided. 080 */ 081 @Override 082 public JavaClass loadClass(final String className) throws ClassNotFoundException { 083 final String classFile = className.replace('.', '/'); 084 JavaClass RC = findClass(className); 085 if (RC != null) { 086 return RC; 087 } 088 try (InputStream is = loader.getResourceAsStream(classFile + ".class")) { 089 if (is == null) { 090 throw new ClassNotFoundException(className + " not found."); 091 } 092 final ClassParser parser = new ClassParser(is, className); 093 RC = parser.parse(); 094 storeClass(RC); 095 return RC; 096 } catch (final IOException e) { 097 throw new ClassNotFoundException(className + " not found: " + e, e); 098 } 099 } 100 101 102 @Override 103 public JavaClass loadClass( final Class<?> clazz ) throws ClassNotFoundException { 104 return loadClass(clazz.getName()); 105 } 106 107 108 /** Clear all entries from cache. 109 */ 110 @Override 111 public void clear() { 112 loadedClasses.clear(); 113 } 114 115 116 /* 117 * @return null 118 */ 119 @Override 120 public ClassPath getClassPath() { 121 return null; 122 } 123}