Java tutorial
/* * Copyright (C) 2012-2015 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.driver.core; import io.netty.buffer.ByteBuf; import java.io.IOException; import java.nio.ByteBuffer; abstract class FrameCompressor { abstract Frame compress(Frame frame) throws IOException; abstract Frame decompress(Frame frame) throws IOException; 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); } }