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/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.google.common.cache;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import java.util.concurrent.ExecutionException;

/**
 * A cache which forwards all its method calls to another cache. Subclasses should override one or
 * more methods to modify the behavior of the backing cache as desired per the decorator pattern.
 *
 * 

Note that {@link #get}, {@link #getUnchecked}, and {@link #apply} all expose the same * underlying functionality, so should probably be overridden as a group. * * @author Charles Fry * @since 11.0 */ @GwtIncompatible public abstract class ForwardingLoadingCache extends ForwardingCache implements LoadingCache { /** Constructor for use by subclasses. */ protected ForwardingLoadingCache() {} @Override protected abstract LoadingCache delegate(); @Override public V get(K key) throws ExecutionException { return delegate().get(key); } @Override public V getUnchecked(K key) { return delegate().getUnchecked(key); } @Override public ImmutableMap getAll(Iterable keys) throws ExecutionException { return delegate().getAll(keys); } @Override public V apply(K key) { return delegate().apply(key); } @Override public void refresh(K key) { delegate().refresh(key); } /** * A simplified version of {@link ForwardingLoadingCache} where subclasses can pass in an already * constructed {@link LoadingCache} as the delegate. * * @since 10.0 */ public abstract static class SimpleForwardingLoadingCache extends ForwardingLoadingCache { private final LoadingCache delegate; protected SimpleForwardingLoadingCache(LoadingCache delegate) { this.delegate = Preconditions.checkNotNull(delegate); } @Override protected final LoadingCache delegate() { return delegate; } } }





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