1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * https://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.bcel.util; 20 21 import java.lang.ref.SoftReference; 22 import java.util.HashMap; 23 import java.util.Map; 24 25 import org.apache.bcel.classfile.JavaClass; 26 27 /** 28 * This repository is used in situations where a Class is created outside the realm of a ClassLoader. Classes are loaded 29 * from the file systems using the paths specified in the given class path. By default, this is the value returned by 30 * ClassPath.getClassPath(). This repository holds onto classes with SoftReferences, and will reload as needed, in cases 31 * where memory sizes are important. 32 * 33 * @see org.apache.bcel.Repository 34 */ 35 public class MemorySensitiveClassPathRepository extends AbstractClassPathRepository { 36 37 private final Map<String, SoftReference<JavaClass>> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS 38 39 public MemorySensitiveClassPathRepository(final ClassPath path) { 40 super(path); 41 } 42 43 /** 44 * Clear all entries from cache. 45 */ 46 @Override 47 public void clear() { 48 loadedClasses.clear(); 49 } 50 51 /** 52 * Find an already defined (cached) JavaClass object by name. 53 */ 54 @Override 55 public JavaClass findClass(final String className) { 56 final SoftReference<JavaClass> ref = loadedClasses.get(className); 57 return ref == null ? null : ref.get(); 58 } 59 60 /** 61 * Remove class from repository 62 */ 63 @Override 64 public void removeClass(final JavaClass clazz) { 65 loadedClasses.remove(clazz.getClassName()); 66 } 67 68 /** 69 * Store a new JavaClass instance into this Repository. 70 */ 71 @Override 72 public void storeClass(final JavaClass clazz) { 73 // Not calling super.storeClass because this subclass maintains the mapping. 74 loadedClasses.put(clazz.getClassName(), new SoftReference<>(clazz)); 75 clazz.setRepository(this); 76 } 77 }