/*
* 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.io.IOException;
import java.nio.ByteBuffer;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;
import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
import org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultDecodingContext;
import org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultEncodingContext;
import org.apache.hadoop.hbase.io.encoding.HFileBlockEncodingContext;
import org.apache.hadoop.hbase.io.encoding.HFileBlockDecodingContext;
/**
* Does not perform any kind of encoding/decoding.
*/
@InterfaceAudience.Private
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 void beforeWriteToDisk(ByteBuffer in,
boolean includesMemstoreTS,
HFileBlockEncodingContext encodeCtx, BlockType blockType)
throws IOException {
if (!(encodeCtx.getClass().getName().equals(
HFileBlockDefaultEncodingContext.class.getName()))) {
throw new IOException (this.getClass().getName() + " only accepts " +
HFileBlockDefaultEncodingContext.class.getName() + ".");
}
HFileBlockDefaultEncodingContext defaultContext =
(HFileBlockDefaultEncodingContext) encodeCtx;
defaultContext.compressAfterEncodingWithBlockType(in.array(), blockType);
}
@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();
}
@Override
public HFileBlockEncodingContext newOnDiskDataBlockEncodingContext(
Algorithm compressionAlgorithm, byte[] dummyHeader) {
return new HFileBlockDefaultEncodingContext(compressionAlgorithm,
null, dummyHeader);
}
@Override
public HFileBlockDecodingContext newOnDiskDataBlockDecodingContext(
Algorithm compressionAlgorithm) {
return new HFileBlockDefaultDecodingContext(compressionAlgorithm);
}
}