/*
* 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.DataOutputStream;
import java.io.IOException;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.KeyValueUtil;
import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
import org.apache.hadoop.hbase.io.encoding.HFileBlockDecodingContext;
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.io.WritableUtils;
/**
* 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 int encode(Cell cell, HFileBlockEncodingContext encodingCtx, DataOutputStream out)
throws IOException {
int klength = KeyValueUtil.keyLength(cell);
int vlength = cell.getValueLength();
out.writeInt(klength);
out.writeInt(vlength);
CellUtil.writeFlatKey(cell, out);
out.write(cell.getValueArray(), cell.getValueOffset(), vlength);
int encodedKvSize = klength + vlength + KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE;
// Write the additional tag into the stream
if (encodingCtx.getHFileContext().isIncludesTags()) {
int tagsLength = cell.getTagsLength();
out.writeShort(tagsLength);
if (tagsLength > 0) {
out.write(cell.getTagsArray(), cell.getTagsOffset(), tagsLength);
}
encodedKvSize += tagsLength + KeyValue.TAGS_LENGTH_SIZE;
}
if (encodingCtx.getHFileContext().isIncludesMvcc()) {
WritableUtils.writeVLong(out, cell.getSequenceId());
encodedKvSize += WritableUtils.getVIntSize(cell.getSequenceId());
}
return encodedKvSize;
}
@Override
public boolean useEncodedScanner() {
return false;
}
@Override
public void saveMetadata(HFile.Writer writer) {
}
@Override
public DataBlockEncoding getDataBlockEncoding() {
return DataBlockEncoding.NONE;
}
@Override
public DataBlockEncoding getEffectiveEncodingInCache(boolean isCompaction) {
return DataBlockEncoding.NONE;
}
@Override
public String toString() {
return getClass().getSimpleName();
}
@Override
public HFileBlockEncodingContext newDataBlockEncodingContext(
byte[] dummyHeader, HFileContext meta) {
return new HFileBlockDefaultEncodingContext(null, dummyHeader, meta);
}
@Override
public HFileBlockDecodingContext newDataBlockDecodingContext(HFileContext meta) {
return new HFileBlockDefaultDecodingContext(meta);
}
@Override
public void startBlockEncoding(HFileBlockEncodingContext encodingCtx, DataOutputStream out)
throws IOException {
}
@Override
public void endBlockEncoding(HFileBlockEncodingContext encodingCtx, DataOutputStream out,
byte[] uncompressedBytesWithHeader, BlockType blockType) throws IOException {
encodingCtx.postEncoding(BlockType.DATA);
}
}