/
WeightIteratorFromBytes.java
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/
WeightIteratorFromBytes.java
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/*
* Copyright (c) 2011 LinkedIn, Inc
*
* 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 cleo.search.util;
import java.nio.ByteBuffer;
/**
* WeightIteratorFromBytes
*
* @author jwu
* @since 04/30, 2011
*/
public class WeightIteratorFromBytes implements WeightIterator {
private final ByteBuffer bb;
private final int count;
private int index = 0;
public WeightIteratorFromBytes(byte[] bytes, int offset, int length) {
if(offset < 0 || length < 0 || bytes.length < (offset + length)) {
throw new IllegalArgumentException("offset and length");
}
this.bb = ByteBuffer.wrap(bytes, offset, length);
this.count = length / (Weight.ELEMENT_ID_NUM_BYTES + Weight.ELEMENT_WEIGHT_NUM_BYTES);
}
@Override
public void next(Weight weight) {
index++;
weight.elementId = bb.getInt();
weight.elementWeight = bb.getInt();
}
@Override
public boolean hasNext() {
return index < count;
}
@Override
public Weight next() {
index++;
return new Weight(bb.getInt(), bb.getInt());
}
@Override
public void remove() {}
/**
* @return the byte array that backs this iterator.
*/
public byte[] array() {
return bb.array();
}
}