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/*
* Copyright 2009-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.raw;
import org.cojen.classfile.CodeAssembler;
import org.cojen.classfile.Label;
import org.cojen.classfile.LocalVariable;
import org.cojen.classfile.Opcode;
import org.cojen.classfile.TypeDesc;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.SupportException;
import com.amazon.carbonado.info.StorableIndex;
import com.amazon.carbonado.info.StorableProperty;
/**
* Extension of GenericEncodingStrategy that allows for compression.
*
* @author Olga Kuznetsova
* @author Brian S O'Neill
*/
public class CompressedEncodingStrategy<S extends Storable> extends GenericEncodingStrategy<S> {
private final CompressionType mCompressionType;
public CompressedEncodingStrategy(Class<S> type,
StorableIndex<S> pkIndex,
CompressionType compressionType) {
super(type, pkIndex);
mCompressionType = compressionType;
}
@Override
protected void extraDataEncoding(CodeAssembler a,
LocalVariable dataVar, int prefix, int suffix)
{
switch (mCompressionType) {
case GZIP:
TypeDesc byteArrayType = TypeDesc.forClass(byte[].class);
a.loadLocal(dataVar);
a.loadConstant(prefix);
a.invokeStatic(GzipCompressor.class.getName(), "compress", byteArrayType,
new TypeDesc[] {byteArrayType, TypeDesc.INT});
a.storeLocal(dataVar);
break;
}
}
@Override
protected void extraDataDecoding(CodeAssembler a,
LocalVariable dataVar, int prefix, int suffix)
{
switch (mCompressionType) {
case GZIP:
TypeDesc byteArrayType = TypeDesc.forClass(byte[].class);
a.loadLocal(dataVar);
a.loadConstant(prefix);
a.invokeStatic(GzipCompressor.class.getName(), "decompress", byteArrayType,
new TypeDesc[] {byteArrayType, TypeDesc.INT});
a.storeLocal(dataVar);
break;
}
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj != null && obj.getClass() == this.getClass()) {
CompressedEncodingStrategy other = (CompressedEncodingStrategy) obj;
return super.equals(obj) && mCompressionType.equals(other.mCompressionType);
}
return false;
}
@Override
public int hashCode() {
return super.hashCode() + mCompressionType.hashCode();
}
}
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