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/*******************************************************************************
* Copyright (c) 2011 Red Hat, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Red Hat Incorporated - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.autotools.core;
public class VersionComparator {
/**
* Compare two version numbers if
* return -1 if v1 is older than v2 0 if they are the same and +1
* if v1 is newer than v2
*
* Version numbers are expected to be in the format x.y.z...
*
* So:
* VersionComparator.compare("1.0", "1.2") return -1
* VersionComparator.compare("1.5", "1.2") returns 1
* VersionComparator.compare("1.5.1", "1.5.5") returns -1
* VersionComparator.compare("1.5", "1.5.1") returns 1
* VersionComparator.compare("1.5.1", "1.5.1") returns 0
*/
public static int compare(String v1, String v2) {
String[] v1digits = v1.split("\\.");
String[] v2digits = v2.split("\\.");
for (int i = 0; i < v1digits.length && i < v2digits.length; i++) {
int d1 = Integer.valueOf(v1digits[i]);
int d2 = Integer.valueOf(v2digits[i]);
if (d1 < d2)
return -1;
if (d1 > d2)
return 1;
}
// At this point all digits have the same value
// so the version with the longer string wins
if (v1digits.length < v2digits.length)
return -1;
if (v1digits.length > v2digits.length)
return 1;
return 0;
}
}
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