server/src/com/cloud/maint/Version.java

// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.maint;

public class Version {
    /**
     * Compares two version strings and see which one is higher version.
     * @param ver1
     * @param ver2
     * @return positive if ver1 is higher.  negative if ver1 is lower; zero if the same.
     */
    public static int compare(String ver1, String ver2) {
        String[] tokens1 = ver1.split("[.]");
        String[] tokens2 = ver2.split("[.]");
//        assert(tokens1.length <= tokens2.length);
        
        int compareLength = Math.min(tokens1.length, tokens2.length);
        for (int i = 0; i < compareLength; i++) {
        	long version1 = Long.parseLong(tokens1[i]);
        	long version2 = Long.parseLong(tokens2[i]);
            if (version1 != version2) {
                return version1 < version2 ? -1 : 1;
            }
        }
        
        if (tokens1.length > tokens2.length) {
            return 1;
        } else if (tokens1.length < tokens2.length) {
            return -1;
        }
        
        return 0;
    }
    
    public static String trimToPatch(String version) {
        String[] tokens = version.split("[.]");
        return tokens[0] + "." + tokens[1]+ "." + tokens[2];
    }
    
    public static void main(String[] args) {
    	System.out.println("Result is " + compare(args[0], args[1]));
    }

}