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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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 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.apache.cayenne.modeler.util;
Helper class to deal with version strings.

Andrus Adamchik
public class Version implements Comparable {
    protected String versionString;
    protected int[] versionParts;
    public Version(String versionStringthrows NumberFormatException {
        if (versionString == null) {
            throw new IllegalArgumentException("Null version.");
        if (versionString.trim().length() == 0) {
            throw new IllegalArgumentException("Empty version.");
        this. = versionString;
        StringTokenizer toks = new StringTokenizer(versionString".");
         = new int[toks.countTokens()];
        for (int i = 0; i < .i++) {
            [i] = Integer.parseInt(toks.nextToken());
    public int compareTo(Object o) {
        if (o instanceof CharSequence) {
            o = new Version(o.toString());
        else if (!(o instanceof Version)) {
            throw new IllegalArgumentException(
                    "Can only compare to Versions and Strings, got: " + o);
        int[] otherVersion = ((Versiono).;
        int len = Math.min(otherVersion.length.);
        for (int i = 0; i < leni++) {
            int delta = [i] - otherVersion[i];
            if (delta != 0) {
                return delta;
        if (. < otherVersion.length) {
            return -1;
        else if (. > otherVersion.length) {
            return 1;
        else {
            return 0;
    public String getVersionString() {
        return ;
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