org.wildfly.common.iteration.InterleavedByteArrayIterator Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* 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.util.NoSuchElementException;
/**
*/
final class InterleavedByteArrayIterator extends ByteIterator {
private final int len;
private final byte[] bytes;
private final int offs;
private final int[] interleave;
private int idx;
InterleavedByteArrayIterator(final int len, final byte[] bytes, final int offs, final int[] interleave) {
this.len = len;
this.bytes = bytes;
this.offs = offs;
this.interleave = interleave;
idx = 0;
}
public boolean hasNext() {
return idx < len;
}
public boolean hasPrevious() {
return idx > 0;
}
public int next() {
if (! hasNext()) throw new NoSuchElementException();
return bytes[offs + interleave[idx++]] & 0xff;
}
public int previous() {
if (! hasPrevious()) throw new NoSuchElementException();
return bytes[offs + interleave[-- idx]] & 0xff;
}
public int peekNext() throws NoSuchElementException {
if (! hasNext()) throw new NoSuchElementException();
return bytes[offs + interleave[idx]] & 0xff;
}
public int peekPrevious() throws NoSuchElementException {
if (! hasPrevious()) throw new NoSuchElementException();
return bytes[offs + interleave[idx - 1]] & 0xff;
}
public long getIndex() {
return idx;
}
}