001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 * 
016 * Contributors:
017 *     Florent Guillaume
018 *     Sun Seng David TAN
019 */
020
021package org.nuxeo.common.utils;
022
023import java.io.Serializable;
024import java.util.Arrays;
025
026import javax.transaction.xa.Xid;
027
028/**
029 * A Serializable {@link Xid} independent of the transaction manager implementation.
030 */
031public class XidImpl implements Xid, Serializable {
032
033    private static final long serialVersionUID = 1L;
034
035    public final int fid;
036
037    public final byte[] gtrid;
038
039    public final byte[] bqual;
040
041    /**
042     * Copy constructor.
043     *
044     * @param xid the xid to copy
045     */
046    public XidImpl(Xid xid) {
047        fid = xid.getFormatId();
048        gtrid = xid.getGlobalTransactionId().clone();
049        bqual = xid.getBranchQualifier().clone();
050    }
051
052    /**
053     * Constructor mostly used in unit tests.
054     *
055     * @param id the global transaction id
056     */
057    public XidImpl(String id) {
058        fid = 0;
059        gtrid = id.getBytes();
060        // MySQL JDBC driver needs a non 0-length branch qualifier
061        bqual = new byte[] { 0 };
062    }
063
064    public int getFormatId() {
065        return fid;
066    }
067
068    public byte[] getGlobalTransactionId() {
069        return gtrid.clone();
070    }
071
072    public byte[] getBranchQualifier() {
073        return bqual.clone();
074    }
075
076    @Override
077    public int hashCode() {
078        final int prime = 31;
079        int hash = 1;
080        hash = prime * hash + fid;
081        hash = prime * hash + Arrays.hashCode(gtrid);
082        hash = prime * hash + Arrays.hashCode(bqual);
083        return hash;
084    }
085
086    @Override
087    public boolean equals(Object other) {
088        if (!(other instanceof XidImpl)) {
089            return false;
090        }
091        return equals((XidImpl) other);
092    }
093
094    private boolean equals(XidImpl other) {
095        if (other == this) {
096            return true;
097        }
098        return fid == other.fid && Arrays.equals(gtrid, other.gtrid) && Arrays.equals(bqual, other.bqual);
099    }
100
101}