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/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000,
*
* Arjuna Solutions Limited,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: XidImple.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.jta.xa;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import javax.transaction.xa.Xid;
import com.arjuna.ats.arjuna.AtomicAction;
import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.ats.arjuna.state.InputObjectState;
import com.arjuna.ats.arjuna.state.OutputObjectState;
import com.arjuna.ats.internal.jta.xa.XID;
import com.arjuna.ats.jta.logging.jtaLogger;
/**
* Implementation of javax.transaction.xa.Xid.
*
* @author Mark Little ([email protected])
* @version $Id: XidImple.java 2342 2006-03-30 13:06:17Z $
* @since JTS 1.2.4.
*/
public class XidImple implements javax.transaction.xa.Xid, Serializable {
private static final long serialVersionUID = -8922505475867377266L;
public XidImple() {
_theXid = null;
hashCode = getHash(_theXid);
}
public XidImple(Xid xid) {
_theXid = null;
copy(xid);
hashCode = getHash(_theXid) ;
}
public XidImple(AtomicAction c) {
this(c.get_uid(), false, null);
}
public XidImple(Xid xid, boolean branch, Integer eisName) {
this(xid);
if (branch) {
XATxConverter.setBranchUID(_theXid, new Uid());
}
XATxConverter.setEisName(_theXid, eisName);
}
/**
* @deprecated This is only used by test code
*/
public XidImple(Uid id) {
this(id, false, null);
}
public XidImple(Uid id, boolean branch, Integer eisName) {
try {
_theXid = XATxConverter.getXid(id, branch, eisName);
} catch (Exception e) {
_theXid = null;
e.printStackTrace();
// abort or throw exception?
}
hashCode = getHash(_theXid);
}
public XidImple(XID x) {
_theXid = x;
hashCode = getHash(_theXid);
}
public final boolean isSameTransaction(Xid xid) {
if (xid == null)
return false;
if (xid instanceof XidImple) {
return _theXid.isSameTransaction(((XidImple) xid)._theXid);
}
if (getFormatId() == xid.getFormatId()) {
byte[] gtx = xid.getGlobalTransactionId();
if (_theXid.gtrid_length == gtx.length) {
if (equals(xid))
return true;
else {
for (int i = 0; i < _theXid.gtrid_length; i++) {
if (_theXid.data[i] != gtx[i])
return false;
}
return true;
}
}
}
return false;
}
public int getFormatId() {
if (_theXid != null) {
return _theXid.formatID;
} else
return -1;
}
/**
* These operations critically rely on the fact that we unpack the array in
* the order we packed it!
*/
public byte[] getGlobalTransactionId() {
if (_theXid != null) {
byte b[] = new byte[_theXid.gtrid_length];
System.arraycopy(_theXid.data, 0, b, 0, b.length);
return b;
} else
return null;
}
public byte[] getBranchQualifier() {
if (_theXid != null) {
byte b[] = new byte[_theXid.bqual_length];
System.arraycopy(_theXid.data, _theXid.gtrid_length, b, 0, b.length);
return b;
} else
return null;
}
public final Uid getTransactionUid() {
return XATxConverter.getUid(_theXid);
}
public final XID getXID() {
return _theXid;
}
public final void copy(Xid xid) {
_theXid = new XID();
if (xid != null) {
if (xid instanceof XidImple)
_theXid.copy(((XidImple) xid)._theXid);
else {
_theXid.formatID = xid.getFormatId();
byte[] gtx = xid.getGlobalTransactionId();
byte[] bql = xid.getBranchQualifier();
final int bqlength = (bql == null ? 0 : bql.length);
_theXid.gtrid_length = gtx.length;
_theXid.bqual_length = bqlength;
System.arraycopy(gtx, 0, _theXid.data, 0, gtx.length);
if (bqlength > 0) {
System.arraycopy(bql, 0, _theXid.data, gtx.length,
bql.length);
}
}
}
}
public boolean equals(Xid xid) {
if (xid == null)
return false;
if (xid == this)
return true;
else {
if (xid instanceof XidImple)
return ((XidImple) xid)._theXid.equals(_theXid);
else {
if (xid.getFormatId() == _theXid.formatID) {
byte[] gtx = xid.getGlobalTransactionId();
byte[] bql = xid.getBranchQualifier();
final int bqlength = (bql == null ? 0 : bql.length);
if ((_theXid.gtrid_length == gtx.length)
&& (_theXid.bqual_length == bqlength)) {
int i;
for (i = 0; i < _theXid.gtrid_length; i++) {
if (_theXid.data[i] != gtx[i])
return false;
}
for (i = _theXid.gtrid_length; i < _theXid.gtrid_length
+ _theXid.bqual_length; i++) {
if (_theXid.data[i] != bql[i])
return false;
}
return true;
}
}
}
}
return false;
}
public final boolean packInto(OutputObjectState os) {
boolean result = false;
try {
os.packInt(_theXid.formatID);
os.packInt(_theXid.gtrid_length);
os.packInt(_theXid.bqual_length);
os.packBytes(_theXid.data);
result = true;
} catch (Exception e) {
e.printStackTrace();
result = false;
}
return result;
}
public final boolean unpackFrom(InputObjectState os) {
boolean result = false;
try {
if (_theXid == null)
_theXid = new XID();
_theXid.formatID = os.unpackInt();
_theXid.gtrid_length = os.unpackInt();
_theXid.bqual_length = os.unpackInt();
_theXid.data = os.unpackBytes();
hashCode = getHash(_theXid);
result = true;
} catch (Exception e) {
result = false;
}
return result;
}
public static final void pack(OutputObjectState os, Xid xid)
throws IOException {
if (xid instanceof XidImple) {
XidImple x = (XidImple) xid;
os.packBoolean(true);
if (!x.packInto(os))
throw new IOException(jtaLogger.i18NLogger.get_xid_packerror());
} else {
os.packBoolean(false);
ByteArrayOutputStream s = new ByteArrayOutputStream();
ObjectOutputStream o = new ObjectOutputStream(s);
o.writeObject(xid);
o.close();
os.packBytes(s.toByteArray());
}
}
public static final Xid unpack(InputObjectState os) throws IOException {
if (os.unpackBoolean()) {
XidImple x = new XidImple();
x.unpackFrom(os);
return x;
} else {
try {
byte[] b = os.unpackBytes();
ByteArrayInputStream s = new ByteArrayInputStream(b);
ObjectInputStream o = new ObjectInputStream(s);
Xid x = (Xid) o.readObject();
return x;
} catch (Exception e) {
IOException ioException = new IOException(e.toString());
ioException.initCause(e);
throw ioException;
}
}
}
public String toString() {
if (_theXid != null)
return _theXid.toString();
else
return jtaLogger.i18NLogger.get_xa_xidunset();
}
/**
* Is the specified object equal to this one?
*
* @param obj
* The object to test.
* @return true if they are equal, false otherwise.
*/
public boolean equals(final Object obj) {
if (obj instanceof Xid) {
return equals((Xid) obj);
}
return false;
}
/**
* Return the hash code for this Xid.
*
* @return the hash code.
*/
public int hashCode() {
return hashCode;
}
/**
* Generate the hash code for the xid.
*
* @param xid
* The xid.
* @return The hash code.
*/
protected int getHash(final XID xid) {
if (xid == null) {
return 0;
}
final int hash = generateHash(xid.formatID, xid.data, 0,
xid.gtrid_length);
return generateHash(hash, xid.data, xid.gtrid_length, xid.bqual_length);
}
/**
* Generate a hash code for the specified bytes.
*
* @param hash
* The initial hash.
* @param bytes
* The bytes to include in the hash.
* @return The new hash code.
*/
protected static int generateHash(int hash, final byte[] bytes,
final int start, final int length) {
for (int count = start; count < length; count++) {
hash = 31 * hash + bytes[count];
}
return hash;
}
protected XID _theXid;
private int hashCode;
}
