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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.ovsdb.rfc.utils;
/**
* Version utility class.
*/
public final class VersionUtil {
/**
* Constructs a VersionUtil object. Utility classes should not have a public
* or default constructor, otherwise IDE will compile unsuccessfully. This
* class should not be instantiated.
*/
private VersionUtil() {
}
public static final String DEFAULT_VERSION_STRING = "0.0.0";
private static final String FORMAT = "(\\d+)\\.(\\d+)\\.(\\d+)";
/**
* Match version by the format.
* @param version the version String
* @throws IllegalArgumentException this is an illegal argument exception
*/
public static void versionMatch(String version) {
if (!version.matches(FORMAT)) {
throw new IllegalArgumentException("<" + version
+ "> does not match format " + FORMAT);
}
}
/**
* Compare fromVersion and toVersion.
* @param fromVersion the initial version
* @param toVersion the end of the version
* @return an int number
*/
public static int versionCompare(String fromVersion, String toVersion) {
String[] fromArr = fromVersion.split("\\.");
String[] toArr = toVersion.split("\\.");
int fromFirst = Integer.parseInt(fromArr[0]);
int fromMiddle = Integer.parseInt(fromArr[1]);
int fromEnd = Integer.parseInt(fromArr[2]);
int toFirst = Integer.parseInt(toArr[0]);
int toMiddle = Integer.parseInt(toArr[1]);
int toEnd = Integer.parseInt(toArr[2]);
if (fromFirst - toFirst != 0) {
return fromFirst - toFirst;
} else if (fromMiddle - toMiddle != 0) {
return fromMiddle - toMiddle;
} else {
return fromEnd - toEnd;
}
}
}
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