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/*
* Copyright (C) 2014 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.content.res;
/**
* A Cache class which can be used to cache resource objects that are easy to clone but more
* expensive to inflate.
*
* @hide For internal use only.
*/
public class ConfigurationBoundResourceCache<T> extends ThemedResourceCache<ConstantState<T>> {
private final Resources mResources;
/**
* Creates a cache for the given Resources instance.
*
* @param resources the resources to use when creating new instances
*/
public ConfigurationBoundResourceCache(Resources resources) {
mResources = resources;
}
/**
* If the resource is cached, creates and returns a new instance of it.
*
* @param key a key that uniquely identifies the drawable resource
* @param theme the theme where the resource will be used
* @return a new instance of the resource, or {@code null} if not in
* the cache
*/
public T getInstance(long key, Resources.Theme theme) {
final ConstantState<T> entry = get(key, theme);
if (entry != null) {
return entry.newInstance(mResources, theme);
}
return null;
}
@Override
public boolean shouldInvalidateEntry(ConstantState<T> entry, int configChanges) {
return Configuration.needNewResources(configChanges, entry.getChangingConfigurations());
}
}
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