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      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 }