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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
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8  * particular file as subject to the "Classpath" exception as provided
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11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
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17  * You should have received a copy of the GNU General Public License version
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24  */
25 
26 package java.nio;
27 
28 import java.util.Comparator;
29 import java.util.Spliterator;
30 import java.util.function.IntConsumer;
31 
32 /**
33  * A Spliterator.OfInt for sources that traverse and split elements
34  * maintained in a CharBuffer.
35  *
36  * @implNote
37  * The implementation is based on the code for the Array-based spliterators.
38  */
39 class CharBufferSpliterator implements Spliterator.OfInt {
40     private final CharBuffer buffer;
41     private int index;   // current index, modified on advance/split
42     private final int limit;
43 
CharBufferSpliterator(CharBuffer buffer)44     CharBufferSpliterator(CharBuffer buffer) {
45         this(buffer, buffer.position(), buffer.limit());
46     }
47 
CharBufferSpliterator(CharBuffer buffer, int origin, int limit)48     CharBufferSpliterator(CharBuffer buffer, int origin, int limit) {
49         assert origin <= limit;
50         this.buffer = buffer;
51         this.index = (origin <= limit) ? origin : limit;
52         this.limit = limit;
53     }
54 
55     @Override
trySplit()56     public OfInt trySplit() {
57         int lo = index, mid = (lo + limit) >>> 1;
58         return (lo >= mid)
59                ? null
60                : new CharBufferSpliterator(buffer, lo, index = mid);
61     }
62 
63     @Override
forEachRemaining(IntConsumer action)64     public void forEachRemaining(IntConsumer action) {
65         if (action == null)
66             throw new NullPointerException();
67         CharBuffer cb = buffer;
68         int i = index;
69         int hi = limit;
70         index = hi;
71         while (i < hi) {
72             action.accept(cb.getUnchecked(i++));
73         }
74     }
75 
76     @Override
tryAdvance(IntConsumer action)77     public boolean tryAdvance(IntConsumer action) {
78         if (action == null)
79             throw new NullPointerException();
80         if (index >= 0 && index < limit) {
81             action.accept(buffer.getUnchecked(index++));
82             return true;
83         }
84         return false;
85     }
86 
87     @Override
estimateSize()88     public long estimateSize() {
89         return (long)(limit - index);
90     }
91 
92     @Override
characteristics()93     public int characteristics() {
94         return Buffer.SPLITERATOR_CHARACTERISTICS;
95     }
96 }
97