| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * 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 org.jetbrains.io; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.Unpooled; |
| import io.netty.channel.ChannelHandlerContext; |
| import org.jetbrains.annotations.Nullable; |
| |
| public abstract class Decoder extends SimpleChannelInboundHandlerAdapter<ByteBuf> { |
| protected ByteBuf cumulation; |
| |
| protected Decoder() { |
| super(false); |
| } |
| |
| @Nullable |
| protected final ByteBuf getBufferIfSufficient(ByteBuf input, int requiredLength, ChannelHandlerContext context) { |
| if (!input.isReadable()) { |
| return null; |
| } |
| |
| if (cumulation == null) { |
| if (input.readableBytes() < requiredLength) { |
| cumulation = context.channel().config().getAllocator().buffer(requiredLength); |
| cumulation.writeBytes(input); |
| return null; |
| } |
| else { |
| return input; |
| } |
| } |
| else { |
| if ((cumulation.readableBytes() + input.readableBytes()) < requiredLength) { |
| cumulation.writeBytes(input); |
| return null; |
| } |
| else { |
| ByteBuf buffer = Unpooled.wrappedBuffer(cumulation, input); |
| input.skipBytes(input.readableBytes()); |
| cumulation = null; |
| return buffer; |
| } |
| } |
| } |
| } |