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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;
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 get(java.lang.Object), getUnchecked(java.lang.Object), and apply(java.lang.Object) all expose the same underlying functionality, so should probably be overridden as a group.

Author(s):
Charles Fry
Since:
11.0
public abstract class ForwardingLoadingCache<K, V>
    extends ForwardingCache<K, V> implements LoadingCache<K, V> {

  
Constructor for use by subclasses.
  protected ForwardingLoadingCache() {}
  protected abstract LoadingCache<K, V> delegate();
  public V get(K keythrows ExecutionException {
    return delegate().get(key);
  }
  public V getUnchecked(K key) {
    return delegate().getUnchecked(key);
  }
  public ImmutableMap<K, V> getAll(Iterable<? extends K> keysthrows ExecutionException {
    return delegate().getAll(keys);
  }
  public V apply(K key) {
    return delegate().apply(key);
  }
  public void refresh(K key) {
    delegate().refresh(key);
  }

  
A simplified version of ForwardingLoadingCache where subclasses can pass in an already constructed LoadingCache as the delegete.

Since:
10.0
  @Beta
  public abstract static class SimpleForwardingLoadingCache<K, V>
      extends ForwardingLoadingCache<K, V> {
    private final LoadingCache<K, V> delegate;
    protected SimpleForwardingLoadingCache(LoadingCache<K, V> delegate) {
      this. = Preconditions.checkNotNull(delegate);
    }
    @Override
    protected final LoadingCache<K, V> delegate() {
      return ;
    }
  }
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