001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.io.encoding; 019 020import java.io.IOException; 021import java.nio.ByteBuffer; 022import org.apache.hadoop.conf.Configuration; 023import org.apache.hadoop.hbase.ByteBufferKeyOnlyKeyValue; 024import org.apache.hadoop.hbase.ExtendedCell; 025import org.apache.hadoop.hbase.KeyValue; 026import org.apache.hadoop.hbase.io.hfile.BlockType; 027import org.apache.hadoop.hbase.io.hfile.HFileContext; 028import org.apache.yetus.audience.InterfaceAudience; 029 030@InterfaceAudience.Private 031public abstract class AbstractDataBlockEncoder implements DataBlockEncoder { 032 033 @Override 034 public HFileBlockEncodingContext newDataBlockEncodingContext(Configuration conf, 035 DataBlockEncoding encoding, byte[] header, HFileContext meta) { 036 return new HFileBlockDefaultEncodingContext(conf, encoding, header, meta); 037 } 038 039 @Override 040 public HFileBlockDecodingContext newDataBlockDecodingContext(Configuration conf, 041 HFileContext meta) { 042 return new HFileBlockDefaultDecodingContext(conf, meta); 043 } 044 045 protected void postEncoding(HFileBlockEncodingContext encodingCtx) throws IOException { 046 if (encodingCtx.getDataBlockEncoding() != DataBlockEncoding.NONE) { 047 encodingCtx.postEncoding(BlockType.ENCODED_DATA); 048 } else { 049 encodingCtx.postEncoding(BlockType.DATA); 050 } 051 } 052 053 protected ExtendedCell createFirstKeyCell(ByteBuffer key, int keyLength) { 054 if (key.hasArray()) { 055 return new KeyValue.KeyOnlyKeyValue(key.array(), key.arrayOffset() + key.position(), 056 keyLength); 057 } else { 058 return new ByteBufferKeyOnlyKeyValue(key, key.position(), keyLength); 059 } 060 } 061 062 /** 063 * Decorates EncodedSeeker with a {@link HFileBlockDecodingContext} 064 */ 065 protected abstract static class AbstractEncodedSeeker implements EncodedSeeker { 066 protected HFileBlockDecodingContext decodingCtx; 067 068 public AbstractEncodedSeeker(HFileBlockDecodingContext decodingCtx) { 069 this.decodingCtx = decodingCtx; 070 } 071 072 protected boolean includesMvcc() { 073 return this.decodingCtx.getHFileContext().isIncludesMvcc(); 074 } 075 076 protected boolean includesTags() { 077 return this.decodingCtx.getHFileContext().isIncludesTags(); 078 } 079 } 080}