1 /* 2 * Copyright (C) 2012 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 import com.google.common.collect.Multisets.UnmodifiableMultiset; 21 22 import java.util.Comparator; 23 import java.util.NavigableSet; 24 25 /** 26 * Implementation of {@link Multisets#unmodifiableSortedMultiset(SortedMultiset)}, 27 * split out into its own file so it can be GWT emulated (to deal with the differing 28 * elementSet() types in GWT and non-GWT). 29 * 30 * @author Louis Wasserman 31 */ 32 @GwtCompatible(emulated = true) 33 final class UnmodifiableSortedMultiset<E> 34 extends UnmodifiableMultiset<E> implements SortedMultiset<E> { 35 UnmodifiableSortedMultiset(SortedMultiset<E> delegate) { 36 super(delegate); 37 } 38 39 @Override 40 protected SortedMultiset<E> delegate() { 41 return (SortedMultiset<E>) super.delegate(); 42 } 43 44 @Override 45 public Comparator<? super E> comparator() { 46 return delegate().comparator(); 47 } 48 49 @Override 50 NavigableSet<E> createElementSet() { 51 return Sets.unmodifiableNavigableSet(delegate().elementSet()); 52 } 53 54 @Override 55 public NavigableSet<E> elementSet() { 56 return (NavigableSet<E>) super.elementSet(); 57 } 58 59 private transient UnmodifiableSortedMultiset<E> descendingMultiset; 60 61 @Override 62 public SortedMultiset<E> descendingMultiset() { 63 UnmodifiableSortedMultiset<E> result = descendingMultiset; 64 if (result == null) { 65 result = new UnmodifiableSortedMultiset<E>( 66 delegate().descendingMultiset()); 67 result.descendingMultiset = this; 68 return descendingMultiset = result; 69 } 70 return result; 71 } 72 73 @Override 74 public Entry<E> firstEntry() { 75 return delegate().firstEntry(); 76 } 77 78 @Override 79 public Entry<E> lastEntry() { 80 return delegate().lastEntry(); 81 } 82 83 @Override 84 public Entry<E> pollFirstEntry() { 85 throw new UnsupportedOperationException(); 86 } 87 88 @Override 89 public Entry<E> pollLastEntry() { 90 throw new UnsupportedOperationException(); 91 } 92 93 @Override 94 public SortedMultiset<E> headMultiset(E upperBound, BoundType boundType) { 95 return Multisets.unmodifiableSortedMultiset( 96 delegate().headMultiset(upperBound, boundType)); 97 } 98 99 @Override 100 public SortedMultiset<E> subMultiset( 101 E lowerBound, BoundType lowerBoundType, 102 E upperBound, BoundType upperBoundType) { 103 return Multisets.unmodifiableSortedMultiset(delegate().subMultiset( 104 lowerBound, lowerBoundType, upperBound, upperBoundType)); 105 } 106 107 @Override 108 public SortedMultiset<E> tailMultiset(E lowerBound, BoundType boundType) { 109 return Multisets.unmodifiableSortedMultiset( 110 delegate().tailMultiset(lowerBound, boundType)); 111 } 112 113 private static final long serialVersionUID = 0; 114 }