test-runner/src/android/test/SimpleCache.java

/*
 * Copyright (C) 2008 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.test;

import java.util.HashMap;
import java.util.Map;

abstract class SimpleCache<K, V> {
    private Map<K, V> map = new HashMap<K, V>();

    protected abstract V load(K key);

    final V get(K key) {
        if (map.containsKey(key)) {
            return map.get(key);
        }
        V value = load(key);
        map.put(key, value);
        return value;
    }
}