/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
//----------------------------------------------------------------------------
//
// Module: LogRecordHeader.java
//
// Description: Log record header.
//
// Product: com.sun.jts.CosTransactions
//
// Author: Simon Holdsworth
//
// Date: March, 1997
//
// Copyright (c): 1995-1997 IBM Corp.
//
// The source code for this program is not published or otherwise divested
// of its trade secrets, irrespective of what has been deposited with the
// U.S. Copyright Office.
//
// This software contains confidential and proprietary information of
// IBM Corp.
//----------------------------------------------------------------------------
package com.sun.jts.CosTransactions;
import java.io.*;
/**
* A class containing header information for a log record.
*
* @version 0.01
*
* @author Simon Holdsworth, IBM Corporation
*
* @see LogHandle
*/
class LogRecordHeader implements Serializable {
/**
* This constant holds the size of the LogRecordHeader object.
*/
final static int SIZEOF = 3 * LogLSN.SIZEOF + 8;
int recordType = 0;
LogLSN currentLSN = null;
LogLSN previousLSN = null;
LogLSN nextLSN = null;
int recordLength = 0;
LogRecordHeader() {
currentLSN = new LogLSN();
previousLSN = new LogLSN();
nextLSN = new LogLSN();
}
/**
* Constructs a LogRecordHeader from the given byte array.
*
* @param bytes The array of bytes from which the object is to
* be constructed.
* @param index The index in the array where copy is to start.
*
* @return
*
* @see
*/
LogRecordHeader(byte[] bytes, int index) {
recordType = (bytes[index++]&255) +
((bytes[index++]&255) << 8) +
((bytes[index++]&255) << 16) +
((bytes[index++]&255) << 24);
currentLSN = new LogLSN(bytes,index); index += LogLSN.SIZEOF;
previousLSN = new LogLSN(bytes,index); index += LogLSN.SIZEOF;
nextLSN = new LogLSN(bytes,index); index += LogLSN.SIZEOF;
recordLength = (bytes[index++]&255) +
((bytes[index++]&255) << 8) +
((bytes[index++]&255) << 16) +
((bytes[index++]&255) << 24);
}
/**
* Makes the target object a copy of the parameter.
*
* @param other The object to be copied.
*
* @return
*
* @see
*/
void copy( LogRecordHeader other) {
recordType = other.recordType;
currentLSN.copy(other.currentLSN);
previousLSN.copy(other.previousLSN);
nextLSN.copy(other.nextLSN);
recordLength = other.recordLength;
}
/**
* Makes a byte representation of the LogRecordHeader.
*
* @param bytes The array of bytes into which the object is to be copied.
* @param index The index in the array where copy is to start.
*
* @return Number of bytes copied.
*
* @see
*/
final int toBytes(byte[] bytes, int index) {
bytes[index++] = (byte) recordType;
bytes[index++] = (byte)(recordType >> 8);
bytes[index++] = (byte)(recordType >> 16);
bytes[index++] = (byte)(recordType >> 24);
index += currentLSN.toBytes(bytes,index);
index += previousLSN.toBytes(bytes,index);
index += nextLSN.toBytes(bytes,index);
bytes[index++] = (byte) recordLength;
bytes[index++] = (byte)(recordLength >> 8);
bytes[index++] = (byte)(recordLength >> 16);
bytes[index++] = (byte)(recordLength >> 24);
return SIZEOF;
}
/**
* This method is called to direct the object to format its state
* to a String.
*
* @param
*
* @return The formatted representation of the object.
*
* @see
*/
public final String toString() {
return "LRH(type="/*#Frozen*/ + recordType + ",curr="/*#Frozen*/ + currentLSN +
",prev="/*#Frozen*/ + previousLSN + ",next="/*#Frozen*/ + nextLSN +
",len="/*#Frozen*/ + recordLength + ")"/*#Frozen*/;
}
}
|
