content: /*****************************************************************
   *   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
   *
   *    https://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.apache.cayenne.modeler.util;
  
  import java.util.StringTokenizer;
  
  /**
   * Helper class to deal with version strings.
   * 
   */
  public class Version implements Comparable<Object> {
  
      protected String versionString;
      protected int[] versionParts;
  
      public Version(String versionString) throws NumberFormatException {
          if (versionString == null) {
              throw new IllegalArgumentException("Null version.");
          }
  
          if (versionString.trim().length() == 0) {
              throw new IllegalArgumentException("Empty version.");
          }
  
          this.versionString = versionString;
  
          StringTokenizer toks = new StringTokenizer(versionString, ".");
          versionParts = new int[toks.countTokens()];
  
          for (int i = 0; i < versionParts.length; i++) {
              versionParts[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 = ((Version) o).versionParts;
  
          int len = Math.min(otherVersion.length, versionParts.length);
          for (int i = 0; i < len; i++) {
  
              int delta = versionParts[i] - otherVersion[i];
              if (delta != 0) {
                  return delta;
              }
          }
  
          if (versionParts.length < otherVersion.length) {
              return -1;
          }
          else if (versionParts.length > otherVersion.length) {
              return 1;
          }
          else {
              return 0;
          }
      }
  
      public String getVersionString() {
          return versionString;
      }
  }
  