/*
* Copyright 2017 NAVER Corp.
*
* 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 com.navercorp.pinpoint.common.server.bo.codec.stat.header;
import java.util.BitSet;
/**
* JDK 7 implementation of {@link BitCountingHeaderDecoder}.
*
* @author HyunGil Jeong
*/
public class Jdk7BitCountingHeaderDecoder implements AgentStatHeaderDecoder {
private final BitSet headerBitSet;
private int position = 0;
public Jdk7BitCountingHeaderDecoder(byte[] header) {
headerBitSet = BitSet.valueOf(header);
}
@Override
public int getCode() {
int fromIndex = this.position;
int toIndex = this.headerBitSet.nextClearBit(this.position);
int numBitsSet = this.headerBitSet.get(fromIndex, toIndex).cardinality();
this.position = toIndex + 1;
return numBitsSet;
}
}