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/*
* Copyright (C) 2006 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 android.app;
import dalvik.system.PathClassLoader;
import java.util.HashMap;
class ApplicationLoaders
{
public static ApplicationLoaders getDefault()
{
return gApplicationLoaders;
}
public ClassLoader getClassLoader(String zip, String appDataDir,
ClassLoader parent)
{
/*
* This is the parent we use if they pass "null" in. In theory
* this should be the "system" class loader; in practice we
* don't use that and can happily (and more efficiently) use the
* bootstrap class loader.
*/
ClassLoader baseParent = ClassLoader.getSystemClassLoader().getParent();
synchronized (mLoaders) {
if (parent == null) {
parent = baseParent;
}
/*
* If we're one step up from the base class loader, find
* something in our cache. Otherwise, we create a whole
* new ClassLoader for the zip archive.
*/
if (parent == baseParent) {
ClassLoader loader = (ClassLoader)mLoaders.get(zip);
if (loader != null) {
return loader;
}
PathClassLoader pathClassloader =
new PathClassLoader(zip, appDataDir + "/lib", parent);
mLoaders.put(zip, pathClassloader);
return pathClassloader;
}
return new PathClassLoader(zip, parent);
}
}
private final HashMap mLoaders = new HashMap();
private static final ApplicationLoaders gApplicationLoaders
= new ApplicationLoaders();
}
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