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 */ 017package org.apache.bcel.util; 018 019import java.io.IOException; 020import java.io.InputStream; 021import java.util.HashMap; 022import java.util.Map; 023 024import org.apache.bcel.classfile.ClassParser; 025import org.apache.bcel.classfile.JavaClass; 026 027/** 028 * The repository maintains information about which classes have been loaded. 029 * 030 * It loads its data from the ClassLoader implementation passed into its constructor. 031 * 032 * @see org.apache.bcel.Repository 033 */ 034public class ClassLoaderRepository implements Repository { 035 036 private final java.lang.ClassLoader loader; 037 private final Map<String, JavaClass> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS 038 039 public ClassLoaderRepository(final java.lang.ClassLoader loader) { 040 this.loader = loader; 041 } 042 043 /** 044 * Clear all entries from cache. 045 */ 046 @Override 047 public void clear() { 048 loadedClasses.clear(); 049 } 050 051 /** 052 * Find an already defined JavaClass. 053 */ 054 @Override 055 public JavaClass findClass(final String className) { 056 return loadedClasses.get(className); 057 } 058 059 /* 060 * @return null 061 */ 062 @Override 063 public ClassPath getClassPath() { 064 return null; 065 } 066 067 @Override 068 public JavaClass loadClass(final Class<?> clazz) throws ClassNotFoundException { 069 return loadClass(clazz.getName()); 070 } 071 072 /** 073 * Lookup a JavaClass object from the Class Name provided. 074 */ 075 @Override 076 public JavaClass loadClass(final String className) throws ClassNotFoundException { 077 final String classFile = className.replace('.', '/'); 078 JavaClass RC = findClass(className); 079 if (RC != null) { 080 return RC; 081 } 082 try (InputStream is = loader.getResourceAsStream(classFile + ".class")) { 083 if (is == null) { 084 throw new ClassNotFoundException(className + " not found."); 085 } 086 final ClassParser parser = new ClassParser(is, className); 087 RC = parser.parse(); 088 storeClass(RC); 089 return RC; 090 } catch (final IOException e) { 091 throw new ClassNotFoundException(className + " not found: " + e, e); 092 } 093 } 094 095 /** 096 * Remove class from repository 097 */ 098 @Override 099 public void removeClass(final JavaClass clazz) { 100 loadedClasses.remove(clazz.getClassName()); 101 } 102 103 /** 104 * Store a new JavaClass into this Repository. 105 */ 106 @Override 107 public void storeClass(final JavaClass clazz) { 108 loadedClasses.put(clazz.getClassName(), clazz); 109 clazz.setRepository(this); 110 } 111}