Coverage Summary for Class: TransformedListIterator (com.google.common.collect)

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.base.Function;
21 import java.util.ListIterator;
22 
23 /**
24  * An iterator that transforms a backing list iterator; for internal use. This avoids the object
25  * overhead of constructing a {@link Function} for internal methods.
26  *
27  * @author Louis Wasserman
28  */
29 @GwtCompatible
30 abstract class TransformedListIterator<F, T> extends TransformedIterator<F, T>
31     implements ListIterator<T> {
32   TransformedListIterator(ListIterator<? extends F> backingIterator) {
33     super(backingIterator);
34   }
35 
36   private ListIterator<? extends F> backingIterator() {
37     return Iterators.cast(backingIterator);
38   }
39 
40   @Override
41   public final boolean hasPrevious() {
42     return backingIterator().hasPrevious();
43   }
44 
45   @Override
46   public final T previous() {
47     return transform(backingIterator().previous());
48   }
49 
50   @Override
51   public final int nextIndex() {
52     return backingIterator().nextIndex();
53   }
54 
55   @Override
56   public final int previousIndex() {
57     return backingIterator().previousIndex();
58   }
59 
60   @Override
61   public void set(T element) {
62     throw new UnsupportedOperationException();
63   }
64 
65   @Override
66   public void add(T element) {
67     throw new UnsupportedOperationException();
68   }
69 }