001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.bcel.util; 020 021import java.io.IOException; 022import java.io.InputStream; 023import java.util.HashMap; 024import java.util.Map; 025 026import org.apache.bcel.classfile.ClassParser; 027import org.apache.bcel.classfile.JavaClass; 028import org.apache.bcel.classfile.Utility; 029 030/** 031 * The repository maintains information about which classes have been loaded. 032 * 033 * It loads its data from the ClassLoader implementation passed into its constructor. 034 * 035 * @see org.apache.bcel.Repository 036 */ 037public class ClassLoaderRepository implements Repository { 038 039 private final java.lang.ClassLoader loader; 040 private final Map<String, JavaClass> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS 041 042 public ClassLoaderRepository(final java.lang.ClassLoader loader) { 043 this.loader = loader; 044 } 045 046 /** 047 * Clear all entries from cache. 048 */ 049 @Override 050 public void clear() { 051 loadedClasses.clear(); 052 } 053 054 /** 055 * Find an already defined JavaClass. 056 */ 057 @Override 058 public JavaClass findClass(final String className) { 059 return loadedClasses.get(className); 060 } 061 062 /* 063 * @return null 064 */ 065 @Override 066 public ClassPath getClassPath() { 067 return null; 068 } 069 070 @Override 071 public JavaClass loadClass(final Class<?> clazz) throws ClassNotFoundException { 072 return loadClass(clazz.getName()); 073 } 074 075 /** 076 * Lookup a JavaClass object from the Class Name provided. 077 */ 078 @Override 079 public JavaClass loadClass(final String className) throws ClassNotFoundException { 080 final String classFile = Utility.packageToPath(className); 081 JavaClass RC = findClass(className); 082 if (RC != null) { 083 return RC; 084 } 085 try (InputStream is = loader.getResourceAsStream(classFile + JavaClass.EXTENSION)) { 086 if (is == null) { 087 throw new ClassNotFoundException(className + " not found."); 088 } 089 final ClassParser parser = new ClassParser(is, className); 090 RC = parser.parse(); 091 storeClass(RC); 092 return RC; 093 } catch (final IOException e) { 094 throw new ClassNotFoundException(className + " not found: " + e, e); 095 } 096 } 097 098 /** 099 * Remove class from repository 100 */ 101 @Override 102 public void removeClass(final JavaClass clazz) { 103 loadedClasses.remove(clazz.getClassName()); 104 } 105 106 /** 107 * Store a new JavaClass into this Repository. 108 */ 109 @Override 110 public void storeClass(final JavaClass clazz) { 111 loadedClasses.put(clazz.getClassName(), clazz); 112 clazz.setRepository(this); 113 } 114}