001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.fusesource.hawtbuf.codec; 018 019 import java.io.DataInput; 020 import java.io.DataOutput; 021 import java.io.IOException; 022 023 import org.fusesource.hawtbuf.Buffer; 024 025 /** 026 * Implementation of a Codec for Buffer objects 027 * 028 * @author <a href="http://hiramchirino.com">Hiram Chirino</a> 029 */ 030 abstract public class AbstractBufferCodec<T extends Buffer> extends VariableCodec<T> { 031 032 public void encode(T value, DataOutput dataOut) throws IOException { 033 dataOut.writeInt(value.length); 034 dataOut.write(value.data, value.offset, value.length); 035 } 036 037 public T decode(DataInput dataIn) throws IOException { 038 int size = dataIn.readInt(); 039 byte[] data = new byte[size]; 040 dataIn.readFully(data); 041 return createBuffer(data); 042 } 043 044 abstract protected T createBuffer(byte [] data); 045 046 public T deepCopy(T source) { 047 return createBuffer(source.deepCopy().data); 048 } 049 050 public boolean isDeepCopySupported() { 051 return true; 052 } 053 054 @Override 055 public boolean isEstimatedSizeSupported() { 056 return true; 057 } 058 059 public int estimatedSize(T object) { 060 return object.length+4; 061 } 062 063 }