org.wildfly.common.iteration.ByteBufferIterator Maven / Gradle / Ivy
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* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.common.iteration;
import java.nio.ByteBuffer;
import java.util.NoSuchElementException;
/**
*/
final class ByteBufferIterator extends ByteIterator {
private final ByteBuffer buffer;
private final int initialPosition;
ByteBufferIterator(final ByteBuffer buffer) {
this.buffer = buffer;
initialPosition = buffer.position();
}
public boolean hasNext() {
return buffer.hasRemaining();
}
public boolean hasPrevious() {
return buffer.position() > initialPosition;
}
public int next() throws NoSuchElementException {
if (! hasNext()) throw new NoSuchElementException();
return buffer.get() & 0xff;
}
public int peekNext() throws NoSuchElementException {
if (! hasNext()) throw new NoSuchElementException();
return buffer.get(buffer.position()) & 0xff;
}
public int previous() throws NoSuchElementException {
if (! hasPrevious()) throw new NoSuchElementException();
buffer.position(buffer.position() - 1);
return peekNext();
}
public int peekPrevious() throws NoSuchElementException {
if (! hasPrevious()) throw new NoSuchElementException();
return buffer.get(buffer.position() - 1) & 0xff;
}
public long getIndex() {
return buffer.position() - initialPosition;
}
}