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/*
* 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 com.datastax.oss.driver.internal.core.protocol;
import com.datastax.oss.protocol.internal.Compressor;
import com.datastax.oss.driver.shaded.netty.buffer.ByteBuf;
import java.nio.ByteBuffer;
import net.jcip.annotations.ThreadSafe;
@ThreadSafe
public abstract class ByteBufCompressor implements Compressor {
@Override
public ByteBuf compress(ByteBuf uncompressed) {
return uncompressed.isDirect()
? compressDirect(uncompressed, true)
: compressHeap(uncompressed, true);
}
@Override
public ByteBuf compressWithoutLength(ByteBuf uncompressed) {
return uncompressed.isDirect()
? compressDirect(uncompressed, false)
: compressHeap(uncompressed, false);
}
protected abstract ByteBuf compressDirect(ByteBuf input, boolean prependWithUncompressedLength);
protected abstract ByteBuf compressHeap(ByteBuf input, boolean prependWithUncompressedLength);
@Override
public ByteBuf decompress(ByteBuf compressed) {
return decompressWithoutLength(compressed, readUncompressedLength(compressed));
}
protected abstract int readUncompressedLength(ByteBuf compressed);
@Override
public ByteBuf decompressWithoutLength(ByteBuf compressed, int uncompressedLength) {
return compressed.isDirect()
? decompressDirect(compressed, uncompressedLength)
: decompressHeap(compressed, uncompressedLength);
}
protected abstract ByteBuf decompressDirect(ByteBuf input, int uncompressedLength);
protected abstract ByteBuf decompressHeap(ByteBuf input, int uncompressedLength);
protected static ByteBuffer inputNioBuffer(ByteBuf buf) {
// Using internalNioBuffer(...) as we only hold the reference in this method and so can
// reduce Object allocations.
int index = buf.readerIndex();
int len = buf.readableBytes();
return buf.nioBufferCount() == 1
? buf.internalNioBuffer(index, len)
: buf.nioBuffer(index, len);
}
protected static ByteBuffer outputNioBuffer(ByteBuf buf) {
int index = buf.writerIndex();
int len = buf.writableBytes();
return buf.nioBufferCount() == 1
? buf.internalNioBuffer(index, len)
: buf.nioBuffer(index, len);
}
}