97 lines
3.0 KiB
Java
97 lines
3.0 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.nio;
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import java.util.Comparator;
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import java.util.Spliterator;
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import java.util.function.IntConsumer;
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/**
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* A Spliterator.OfInt for sources that traverse and split elements
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* maintained in a CharBuffer.
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*
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* @implNote
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* The implementation is based on the code for the Array-based spliterators.
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*/
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class CharBufferSpliterator implements Spliterator.OfInt {
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private final CharBuffer buffer;
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private int index; // current index, modified on advance/split
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private final int limit;
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CharBufferSpliterator(CharBuffer buffer) {
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this(buffer, buffer.position(), buffer.limit());
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}
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CharBufferSpliterator(CharBuffer buffer, int origin, int limit) {
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assert origin <= limit;
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this.buffer = buffer;
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this.index = (origin <= limit) ? origin : limit;
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this.limit = limit;
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}
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@Override
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public OfInt trySplit() {
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int lo = index, mid = (lo + limit) >>> 1;
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return (lo >= mid)
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? null
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: new CharBufferSpliterator(buffer, lo, index = mid);
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}
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@Override
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public void forEachRemaining(IntConsumer action) {
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if (action == null)
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throw new NullPointerException();
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CharBuffer cb = buffer;
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int i = index;
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int hi = limit;
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index = hi;
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while (i < hi) {
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action.accept(cb.getUnchecked(i++));
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}
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}
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@Override
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public boolean tryAdvance(IntConsumer action) {
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if (action == null)
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throw new NullPointerException();
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if (index >= 0 && index < limit) {
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action.accept(buffer.getUnchecked(index++));
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return true;
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}
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return false;
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}
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@Override
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public long estimateSize() {
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return (long)(limit - index);
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}
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@Override
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public int characteristics() {
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return Buffer.SPLITERATOR_CHARACTERISTICS;
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}
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}
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