1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.app; 18 19 import dalvik.system.PathClassLoader; 20 21 import java.util.HashMap; 22 import java.util.Map; 23 24 class ApplicationLoaders 25 { getDefault()26 public static ApplicationLoaders getDefault() 27 { 28 return gApplicationLoaders; 29 } 30 getClassLoader(String zip, String libPath, ClassLoader parent)31 public ClassLoader getClassLoader(String zip, String libPath, ClassLoader parent) 32 { 33 /* 34 * This is the parent we use if they pass "null" in. In theory 35 * this should be the "system" class loader; in practice we 36 * don't use that and can happily (and more efficiently) use the 37 * bootstrap class loader. 38 */ 39 ClassLoader baseParent = ClassLoader.getSystemClassLoader().getParent(); 40 41 synchronized (mLoaders) { 42 if (parent == null) { 43 parent = baseParent; 44 } 45 46 /* 47 * If we're one step up from the base class loader, find 48 * something in our cache. Otherwise, we create a whole 49 * new ClassLoader for the zip archive. 50 */ 51 if (parent == baseParent) { 52 ClassLoader loader = mLoaders.get(zip); 53 if (loader != null) { 54 return loader; 55 } 56 57 PathClassLoader pathClassloader = 58 new PathClassLoader(zip, libPath, parent); 59 60 mLoaders.put(zip, pathClassloader); 61 return pathClassloader; 62 } 63 64 return new PathClassLoader(zip, parent); 65 } 66 } 67 68 private final Map<String, ClassLoader> mLoaders = new HashMap<String, ClassLoader>(); 69 70 private static final ApplicationLoaders gApplicationLoaders 71 = new ApplicationLoaders(); 72 } 73