1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 import java.util.Map; 22 23 import javax.annotation.Nullable; 24 25 /** 26 * Implementation of {@link ImmutableMultiset} with zero or more elements. 27 * 28 * @author Jared Levy 29 * @author Louis Wasserman 30 */ 31 @GwtCompatible(serializable = true) 32 @SuppressWarnings("serial") 33 // uses writeReplace(), not default serialization 34 class RegularImmutableMultiset<E> extends ImmutableMultiset<E> { 35 private final transient ImmutableMap<E, Integer> map; 36 private final transient int size; 37 RegularImmutableMultiset(ImmutableMap<E, Integer> map, int size)38 RegularImmutableMultiset(ImmutableMap<E, Integer> map, int size) { 39 this.map = map; 40 this.size = size; 41 } 42 43 @Override isPartialView()44 boolean isPartialView() { 45 return map.isPartialView(); 46 } 47 48 @Override count(@ullable Object element)49 public int count(@Nullable Object element) { 50 Integer value = map.get(element); 51 return (value == null) ? 0 : value; 52 } 53 54 @Override size()55 public int size() { 56 return size; 57 } 58 59 @Override contains(@ullable Object element)60 public boolean contains(@Nullable Object element) { 61 return map.containsKey(element); 62 } 63 64 @Override elementSet()65 public ImmutableSet<E> elementSet() { 66 return map.keySet(); 67 } 68 69 @Override getEntry(int index)70 Entry<E> getEntry(int index) { 71 Map.Entry<E, Integer> mapEntry = map.entrySet().asList().get(index); 72 return Multisets.immutableEntry(mapEntry.getKey(), mapEntry.getValue()); 73 } 74 75 @Override hashCode()76 public int hashCode() { 77 return map.hashCode(); 78 } 79 } 80