/*
* Copyright DataStax, Inc.
*
* 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.datastax.oss.driver.internal.core.protocol;
import com.datastax.oss.protocol.internal.Compressor;
import io.netty.buffer.ByteBuf;
import java.nio.ByteBuffer;
import net.jcip.annotations.ThreadSafe;
@ThreadSafe
public abstract class ByteBufCompressor implements Compressor<ByteBuf> {
@Override
public ByteBuf compress(ByteBuf uncompressed) {
return uncompressed.isDirect() ? compressDirect(uncompressed) : compressHeap(uncompressed);
}
protected abstract ByteBuf compressDirect(ByteBuf input);
protected abstract ByteBuf compressHeap(ByteBuf input);
@Override
public ByteBuf decompress(ByteBuf compressed) {
return compressed.isDirect() ? decompressDirect(compressed) : decompressHeap(compressed);
}
protected abstract ByteBuf decompressDirect(ByteBuf input);
protected abstract ByteBuf decompressHeap(ByteBuf input);
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);
}
}