/*
* 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.io.hfile;
import java.nio.ByteBuffer;
import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
import org.apache.hadoop.hbase.util.Pair;
/**
* Does not perform any kind of encoding/decoding.
*/
public class NoOpDataBlockEncoder implements HFileDataBlockEncoder {
public static final NoOpDataBlockEncoder INSTANCE =
new NoOpDataBlockEncoder();
/** Cannot be instantiated. Use {@link #INSTANCE} instead. */
private NoOpDataBlockEncoder() {
}
@Override
public HFileBlock diskToCacheFormat(HFileBlock block, boolean isCompaction) {
if (block.getBlockType() == BlockType.ENCODED_DATA) {
throw new IllegalStateException("Unexpected encoded block");
}
return block;
}
@Override
public Pair<ByteBuffer, BlockType> beforeWriteToDisk(
ByteBuffer in, boolean includesMemstoreTS, byte[] dummyHeader) {
return new Pair<ByteBuffer, BlockType>(in, BlockType.DATA);
}
@Override
public boolean useEncodedScanner(boolean isCompaction) {
return false;
}
@Override
public void saveMetadata(HFile.Writer writer) {
}
@Override
public DataBlockEncoding getEncodingOnDisk() {
return DataBlockEncoding.NONE;
}
@Override
public DataBlockEncoding getEncodingInCache() {
return DataBlockEncoding.NONE;
}
@Override
public DataBlockEncoding getEffectiveEncodingInCache(boolean isCompaction) {
return DataBlockEncoding.NONE;
}
@Override
public String toString() {
return getClass().getSimpleName();
}
}