/*

* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

*

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*/

package java.nio;

import java.util.Comparator;

import java.util.Spliterator;

import java.util.function.IntConsumer;

/**

* A Spliterator.OfInt for sources that traverse and split elements

* maintained in a CharBuffer.

*

* @implNote

* The implementation is based on the code for the Array-based spliterators.

*/

class CharBufferSpliterator implements Spliterator.OfInt {

private final CharBuffer buffer;

private int index; // current index, modified on advance/split

private final int limit;

CharBufferSpliterator(CharBuffer buffer) {

this(buffer, buffer.position(), buffer.limit());

}

CharBufferSpliterator(CharBuffer buffer, int origin, int limit) {

assert origin <= limit;

this.buffer = buffer;

this.index = (origin <= limit) ? origin : limit;

this.limit = limit;

}

@Override

public OfInt trySplit() {

int lo = index, mid = (lo + limit) >>> 1;

return (lo >= mid)

? null

: new CharBufferSpliterator(buffer, lo, index = mid);

}

@Override

public void forEachRemaining(IntConsumer action) {

if (action == null)

throw new NullPointerException();

CharBuffer cb = buffer;

int i = index;

int hi = limit;

index = hi;

while (i < hi) {

action.accept(cb.getUnchecked(i++));

}

}

@Override

public boolean tryAdvance(IntConsumer action) {

if (action == null)

throw new NullPointerException();

if (index >= 0 && index < limit) {

action.accept(buffer.getUnchecked(index++));

return true;

}

return false;

}

@Override

public long estimateSize() {

return (long)(limit - index);

}

@Override

public int characteristics() {

return Buffer.SPLITERATOR_CHARACTERISTICS;

}

}