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 */
017package org.apache.activemq.command;
018
019import java.util.Arrays;
020import javax.transaction.xa.Xid;
021import org.apache.activemq.util.HexSupport;
022
023/**
024 * @openwire:marshaller code="112"
025 * 
026 */
027public class XATransactionId extends TransactionId implements Xid, Comparable {
028
029    public static final byte DATA_STRUCTURE_TYPE = CommandTypes.ACTIVEMQ_XA_TRANSACTION_ID;
030
031    private int formatId;
032    private byte[] branchQualifier;
033    private byte[] globalTransactionId;
034
035    private transient int hash;
036    private transient String transactionKey;
037
038    public XATransactionId() {
039    }
040
041    public XATransactionId(Xid xid) {
042        this.formatId = xid.getFormatId();
043        this.globalTransactionId = xid.getGlobalTransactionId();
044        this.branchQualifier = xid.getBranchQualifier();
045    }
046
047    public byte getDataStructureType() {
048        return DATA_STRUCTURE_TYPE;
049    }
050
051    public synchronized String getTransactionKey() {
052        if (transactionKey == null) {
053            transactionKey = "XID:" + formatId + ":" + HexSupport.toHexFromBytes(globalTransactionId) + ":"
054                             + HexSupport.toHexFromBytes(branchQualifier);
055        }
056        return transactionKey;
057    }
058
059    public String toString() {
060        return getTransactionKey();
061    }
062
063    public boolean isXATransaction() {
064        return true;
065    }
066
067    public boolean isLocalTransaction() {
068        return false;
069    }
070
071    /**
072     * @openwire:property version=1
073     */
074    public int getFormatId() {
075        return formatId;
076    }
077
078    /**
079     * @openwire:property version=1
080     */
081    public byte[] getGlobalTransactionId() {
082        return globalTransactionId;
083    }
084
085    /**
086     * @openwire:property version=1
087     */
088    public byte[] getBranchQualifier() {
089        return branchQualifier;
090    }
091
092    public void setBranchQualifier(byte[] branchQualifier) {
093        this.branchQualifier = branchQualifier;
094        this.hash = 0;
095    }
096
097    public void setFormatId(int formatId) {
098        this.formatId = formatId;
099        this.hash = 0;
100    }
101
102    public void setGlobalTransactionId(byte[] globalTransactionId) {
103        this.globalTransactionId = globalTransactionId;
104        this.hash = 0;
105    }
106
107    public int hashCode() {
108        if (hash == 0) {
109            hash = formatId;
110            hash = hash(globalTransactionId, hash);
111            hash = hash(branchQualifier, hash);
112            if (hash == 0) {
113                hash = 0xaceace;
114            }
115        }
116        return hash;
117    }
118
119    private static int hash(byte[] bytes, int hash) {
120        int size = bytes.length;
121        for (int i = 0; i < size; i++) {
122            hash ^= bytes[i] << ((i % 4) * 8);
123        }
124        return hash;
125    }
126
127    public boolean equals(Object o) {
128        if (o == null || o.getClass() != XATransactionId.class) {
129            return false;
130        }
131        XATransactionId xid = (XATransactionId)o;
132        return xid.formatId == formatId && Arrays.equals(xid.globalTransactionId, globalTransactionId)
133               && Arrays.equals(xid.branchQualifier, branchQualifier);
134    }
135
136    public int compareTo(Object o) {
137        if (o == null || o.getClass() != XATransactionId.class) {
138            return -1;
139        }
140        XATransactionId xid = (XATransactionId)o;
141        return getTransactionKey().compareTo(xid.getTransactionKey());
142    }
143
144}