001 /** 002 * 003 * Copyright 2004 Protique Ltd 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * 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 **/ 018 package org.activemq.transport.xstream; 019 020 import com.thoughtworks.xstream.XStream; 021 import org.activemq.io.TextWireFormat; 022 import org.activemq.io.WireFormat; 023 import org.activemq.message.Packet; 024 025 import javax.jms.JMSException; 026 import java.io.DataInput; 027 import java.io.DataOutput; 028 import java.io.IOException; 029 030 /** 031 * A {@link WireFormat} implementation which uses the 032 * <a href="http://xstream.codehaus.org/>XStream</a> library to marshall 033 * commands onto the wire 034 * 035 * @version $Revision$ 036 */ 037 public class XStreamWireFormat extends TextWireFormat { 038 private XStream xStream; 039 040 public Packet readPacket(DataInput in) throws IOException { 041 String text = in.readUTF(); 042 return (Packet) getXStream().fromXML(text); 043 } 044 045 public Packet readPacket(int firstByte, DataInput in) throws IOException { 046 String text = in.readUTF(); 047 return (Packet) getXStream().fromXML(text); 048 } 049 050 public Packet writePacket(Packet packet, DataOutput out) throws IOException, JMSException { 051 String text = getXStream().toXML(packet); 052 out.writeUTF(text); 053 return null; 054 } 055 056 public WireFormat copy() { 057 return new XStreamWireFormat(); 058 } 059 060 public String toString(Packet packet) { 061 return getXStream().toXML(packet); 062 } 063 064 public Packet fromString(String xml) { 065 return (Packet) getXStream().fromXML(xml); 066 } 067 068 /** 069 * Can this wireformat process packets of this version 070 * @param version the version number to test 071 * @return true if can accept the version 072 */ 073 public boolean canProcessWireFormatVersion(int version){ 074 return true; 075 } 076 077 /** 078 * @return the current version of this wire format 079 */ 080 public int getCurrentWireFormatVersion(){ 081 return 1; 082 } 083 084 // Properties 085 //------------------------------------------------------------------------- 086 public XStream getXStream() { 087 if (xStream == null) { 088 xStream = createXStream(); 089 } 090 return xStream; 091 } 092 093 public void setXStream(XStream xStream) { 094 this.xStream = xStream; 095 } 096 097 // Implementation methods 098 //------------------------------------------------------------------------- 099 protected XStream createXStream() { 100 return new XStream(); 101 } 102 }