| /** |
| * 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.distributedlog.io; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.CompositeByteBuf; |
| import io.netty.buffer.PooledByteBufAllocator; |
| |
| /** |
| * An identity compression codec implementation for {@link CompressionCodec}. |
| */ |
| public class IdentityCompressionCodec implements CompressionCodec { |
| |
| public static IdentityCompressionCodec of() { |
| return INSTANCE; |
| } |
| |
| private static final IdentityCompressionCodec INSTANCE = new IdentityCompressionCodec(); |
| |
| @Override |
| public ByteBuf compress(ByteBuf uncompressed, int headerLen) { |
| checkNotNull(uncompressed); |
| checkArgument(uncompressed.readableBytes() >= 0); |
| if (headerLen == 0) { |
| return uncompressed.retain(); |
| } else { |
| CompositeByteBuf composited = PooledByteBufAllocator.DEFAULT.compositeBuffer(2); |
| composited.addComponent(PooledByteBufAllocator.DEFAULT.buffer(headerLen, headerLen)); |
| composited.addComponent(uncompressed.retain()); |
| return composited; |
| } |
| } |
| |
| @Override |
| public ByteBuf decompress(ByteBuf compressed, int decompressedSize) { |
| checkNotNull(compressed); |
| checkArgument(compressed.readableBytes() >= 0); |
| checkArgument(decompressedSize >= 0); |
| return compressed.retain(); |
| } |
| } |