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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2001, 2012 Oracle and/or its affiliates. All rights reserved.
*
* $Id$
*/
package com.sleepycat.db;
import com.sleepycat.db.internal.DbEnv;
/**
The LogSequenceNumber object is a <em>log sequence number</em> which
specifies a unique location in a log file. A LogSequenceNumber consists
of two unsigned 32-bit integers -- one specifies the log file number,
and the other specifies the offset in the log file.
*/
public class LogSequenceNumber {
private int file;
private int offset;
/**
Construct a LogSequenceNumber with the specified file and offset.
<p>
@param file
The log file number.
<p>
@param offset
The log file offset.
*/
public LogSequenceNumber(final int file, final int offset) {
this.file = file;
this.offset = offset;
}
/**
Construct an uninitialized LogSequenceNumber.
*/
public LogSequenceNumber() {
this(0, 0);
}
/**
Return the file number component of the LogSequenceNumber.
<p>
@return
The file number component of the LogSequenceNumber.
*/
public int getFile() {
return file;
}
/**
Return the file offset component of the LogSequenceNumber.
<p>
@return
The file offset component of the LogSequenceNumber.
*/
public int getOffset() {
return offset;
}
/**
Compare two LogSequenceNumber objects.
<p>
This method returns 0 if the two LogSequenceNumber objects are
equal, 1 if lsn0 is greater than lsn1, and -1 if lsn0 is less than
lsn1.
<p>
@param lsn1
The first LogSequenceNumber object to be compared.
<p>
@param lsn2
The second LogSequenceNumber object to be compared.
<p>
@return
0 if the two LogSequenceNumber objects are equal, 1 if lsn1 is
greater than lsn2, and -1 if lsn1 is less than lsn2.
*/
public static int compare(LogSequenceNumber lsn1, LogSequenceNumber lsn2) {
return DbEnv.log_compare(lsn1, lsn2);
}
}
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