| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dexgen.util; |
| |
| import dalvik.system.DexClassLoader; |
| |
| /** |
| * Class used indirectly for loading generated dex classes. It allows the caller |
| * to obtain appropriate {@code DexClassLoader} instance, which can be then used for |
| * loading classes. |
| */ |
| public class DexClassLoaderHelper { |
| |
| private static class DexClassLoaderHelperHolder { |
| private static final DexClassLoaderHelper INSTANCE = new DexClassLoaderHelper(); |
| } |
| |
| private DexClassLoaderHelper() { |
| // intentionally empty to disable direct instantiation |
| } |
| |
| /** |
| * Returns the sole instance of {@code DexClassLoaderHelper}. |
| * |
| * @return dex {@code DexClassLoaderHelper} sole instance |
| */ |
| public static DexClassLoaderHelper getInstance() { |
| return DexClassLoaderHelperHolder.INSTANCE; |
| } |
| |
| /** |
| * Creates and returns DexClassLoader instance with its classpath |
| * set to {@code pathHolder}. |
| * |
| * @param pathHolder {@code non-null;} location of jar archive containing dex |
| * classes canned into a working PathHolder instance. |
| * @return dex class loader instance with its classpath set to location |
| * indicated by {@code pathHolder} |
| */ |
| public ClassLoader getDexClassLoader(PathHolder pathHolder) { |
| ClassLoader myLoader = DexClassLoaderHelper.class.getClassLoader(); |
| return new DexClassLoader(pathHolder.getJarFilePath(), pathHolder.getDirLocation(), |
| null, myLoader); |
| } |
| } |