Version.java

package com.arcusys.liferay.vaadinplugin.util;

/*
 * #%L
 * Liferay Vaadin Plugin
 * %%
 * Copyright (C) 2013 Arcusys Ltd.
 * %%
 * 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.
 * #L%
 */

import java.util.ArrayList;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * User: mminin
 * Date: 20/08/13
 * Time: 1:51 PM

 */
public class Version {
    private final String rawVersion;
    private final Integer[] numericVersion;

    public Version(String version) {
        rawVersion = version;
        this.numericVersion = parseNumericPart(rawVersion);
    }

    public static Integer[] parseNumericPart(String version){
        String[] versionParts = version.split(" ")[0].split("\\.");
        List<Integer> numbersList = new ArrayList<Integer>();
        for (String versionPart : versionParts) {
            try {
                numbersList.add(Integer.parseInt(versionPart));
            } catch (NumberFormatException exception) {
                break;
            }
        }
        return numbersList.toArray(new Integer[numbersList.size()]);
    }

    public Integer[] getNumericVersion(){
        return numericVersion;
    }

    @Override
    public String toString(){
        return rawVersion;
    }

    public int compareTo(Version that) {
        return this.compareTo(that.numericVersion);
    }

    public int compareTo(Integer[] versionToCompare) {
        if (versionToCompare == null || versionToCompare.length == 0) return 1;

        int length = Math.min(numericVersion.length, versionToCompare.length);
        for (int i = 0; i < length; i++) {
            int compareResult = numericVersion[i].compareTo(versionToCompare[i]);
            if (compareResult != 0) return compareResult;
        }
        return Integer.valueOf(numericVersion.length).compareTo(Integer.valueOf(versionToCompare.length));
    }
}