samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/utils/ResourceCache.java

/*
 * Copyright (C) 2015 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.support.v17.leanback.supportleanbackshowcase.utils;

import android.util.SparseArray;
import android.view.View;

/**
 * ResourceCache allows retrieving children from a given view and caches the resulting views in
 * order to prevent future lookups.
 */
public class ResourceCache {

    private final SparseArray<View> mCachedViews = new SparseArray<View>();

    public <ViewType extends View> ViewType getViewById(View view, int resId) {
        View child = mCachedViews.get(resId, null);
        if (child == null) {
            child = view.findViewById(resId);
            mCachedViews.put(resId, child);
        }
        return (ViewType) child;
    }
}