net.sf.jasperreports.engine.util.VersionComparator Maven / Gradle / Ivy
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY 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
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.util;
import java.util.Comparator;
/**
* @author Teodor Danciu ([email protected])
*/
public class VersionComparator implements Comparator
{
public static final String LOWEST_VERSION = "0";
@Override
public int compare(String currentVersion, String oldVersion)
{
if (oldVersion == null)
{
throw new IllegalArgumentException("Reference version can't be null.");
}
if(currentVersion == null || currentVersion.startsWith(oldVersion))
{
return 1;
}
else
{
String[] oldVersionChunks = oldVersion.split("\\.");
String[] currentVersionChunks = currentVersion.split("\\.");
int count = Math.min(oldVersionChunks.length, currentVersionChunks.length);
for (int i = 0, old = 0, current = 0; i < count; i++)
{
try
{
//numeric comparison
old = Integer.valueOf(oldVersionChunks[i]);
current = Integer.valueOf(currentVersionChunks[i]);
if (current != old)
{
return current - old;
}
}
catch (NumberFormatException e)
{
//string comparison
if (currentVersionChunks[i].compareTo(oldVersionChunks[i]) != 0)
{
return currentVersionChunks[i].compareTo(oldVersionChunks[i]);
}
}
}
return currentVersionChunks.length - oldVersionChunks.length;
}
}
}