/*
    * 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.collect;
  
  import com.google.common.annotations.GwtCompatible;
  
  import java.util.Map;
  
  import javax.annotation.Nullable;
  
  /**
   * Implementation of {@link ImmutableMultiset} with zero or more elements.
   *
   * @author Jared Levy
   * @author Louis Wasserman
   */
  @GwtCompatible(serializable = true)
  @SuppressWarnings("serial")
  // uses writeReplace(), not default serialization
  class RegularImmutableMultiset<E> extends ImmutableMultiset<E> {
    private final transient ImmutableMap<E, Integer> map;
    private final transient int size;
  
    RegularImmutableMultiset(ImmutableMap<E, Integer> map, int size) {
      this.map = map;
      this.size = size;
    }
  
    @Override
    boolean isPartialView() {
      return map.isPartialView();
    }
  
    @Override
    public int count(@Nullable Object element) {
      Integer value = map.get(element);
      return (value == null) ? 0 : value;
    }
  
    @Override
    public int size() {
      return size;
    }
  
    @Override
    public boolean contains(@Nullable Object element) {
      return map.containsKey(element);
    }
  
    @Override
    public ImmutableSet<E> elementSet() {
      return map.keySet();
    }
  
    @Override
    Entry<E> getEntry(int index) {
      Map.Entry<E, Integer> mapEntry = map.entrySet().asList().get(index);
      return Multisets.immutableEntry(mapEntry.getKey(), mapEntry.getValue());
    }
  
    @Override
    public int hashCode() {
      return map.hashCode();
    }
  }