/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.hbase.codec.prefixtree.decode.timestamp;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.codec.prefixtree.PrefixTreeBlockMeta;
import org.apache.hadoop.hbase.util.vint.UFIntTool;
/**
* Given a block and its blockMeta, this will decode the MvccVersion for the i-th Cell in the block.
*/
@InterfaceAudience.Private
public class MvccVersionDecoder {
protected PrefixTreeBlockMeta blockMeta;
protected byte[] block;
/************** construct ***********************/
public MvccVersionDecoder() {
}
public void initOnBlock(PrefixTreeBlockMeta blockMeta, byte[] block) {
this.block = block;
this.blockMeta = blockMeta;
}
/************** methods *************************/
public long getMvccVersion(int index) {
if (blockMeta.getMvccVersionIndexWidth() == 0) {//all mvccVersions in the block were identical
return blockMeta.getMinMvccVersion();
}
int startIndex = blockMeta.getAbsoluteMvccVersionOffset()
+ blockMeta.getMvccVersionDeltaWidth() * index;
long delta = UFIntTool.fromBytes(block, startIndex, blockMeta.getMvccVersionDeltaWidth());
return blockMeta.getMinMvccVersion() + delta;
}
}