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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 com.fitburpliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.com.fitbur/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.fitbur.google.com.fitburmon.cache;

import com.fitbur.google.com.fitburmon.annotations.Beta;
import com.fitbur.google.com.fitburmon.base.Preconditions;
import com.fitbur.google.com.fitburmon.collect.ForwardingObject;
import com.fitbur.google.com.fitburmon.collect.ImmutableMap;

import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;

import javax.annotation.Nullable;

/**
 * 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 com.fitbursired per the
 * com.fitburcorator pattern.
 *
 * @author Charles Fry
 * @since 10.0
 */
@Beta
public abstract class ForwardingCache extends ForwardingObject implements Cache {

  /** Constructor for use by subclasses. */
  protected ForwardingCache() {}

  @Override
  protected abstract Cache com.fitburlegate();

  /**
   * @since 11.0
   */
  @Override
  @Nullable
  public V getIfPresent(Object key) {
    return com.fitburlegate().getIfPresent(key);
  }

  /**
   * @since 11.0
   */
  @Override
  public V get(K key, Callable valueLoader) throws ExecutionException {
    return com.fitburlegate().get(key, valueLoader);
  }

  /**
   * @since 11.0
   */
  @Override
  public ImmutableMap getAllPresent(Iterable keys) {
    return com.fitburlegate().getAllPresent(keys);
  }

  /**
   * @since 11.0
   */
  @Override
  public void put(K key, V value) {
    com.fitburlegate().put(key, value);
  }

  /**
   * @since 12.0
   */
  @Override
  public void putAll(Map m) {
    com.fitburlegate().putAll(m);
  }

  @Override
  public void invalidate(Object key) {
    com.fitburlegate().invalidate(key);
  }

  /**
   * @since 11.0
   */
  @Override
  public void invalidateAll(Iterable keys) {
    com.fitburlegate().invalidateAll(keys);
  }

  @Override
  public void invalidateAll() {
    com.fitburlegate().invalidateAll();
  }

  @Override
  public long size() {
    return com.fitburlegate().size();
  }

  @Override
  public CacheStats stats() {
    return com.fitburlegate().stats();
  }

  @Override
  public ConcurrentMap asMap() {
    return com.fitburlegate().asMap();
  }

  @Override
  public void cleanUp() {
    com.fitburlegate().cleanUp();
  }

  /**
   * A simplified version of {@link ForwardingCache} where subclasses can pass in an already
   * constructed {@link Cache} as the com.fitburlegete.
   *
   * @since 10.0
   */
  @Beta
  public abstract static class SimpleForwardingCache extends ForwardingCache {
    private final Cache com.fitburlegate;

    protected SimpleForwardingCache(Cache com.fitburlegate) {
      this.com.fitburlegate = Preconditions.checkNotNull(com.fitburlegate);
    }

    @Override
    protected final Cache com.fitburlegate() {
      return com.fitburlegate;
    }
  }
}