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
   *
   * 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.apache.calcite.util;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.Ordering;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import static java.lang.Integer.parseInt;
  
  /**
   * Version string parsed into major and minor parts.
   */
  public class Version implements Comparable<Version> {
    private static final Ordering<Iterable<Integer>> ORDERING =
        Ordering.<Integer>natural().lexicographical();
  
    public final List<Integer> integers;
    public final String string;
  
    /** Private constructor. */
    private Version(List<Integer> integers, String string) {
      this.integers = ImmutableList.copyOf(integers);
      this.string = string;
    }
  
    /** Creates a Version by parsing a string. */
    public static Version of(String s) {
      final String[] strings = s.split("[.-]");
      List<Integer> integers = new ArrayList<>();
      for (String string : strings) {
        try {
          integers.add(parseInt(string));
        } catch (NumberFormatException e) {
          break;
        }
      }
      return new Version(integers, s);
    }
  
    /** Creates a Version from a sequence of integers. */
    public static Version of(int... integers) {
      return new Version(ImmutableIntList.copyOf(integers), "");
    }
  
    @Override public int compareTo(Version version) {
      return ORDERING.compare(this.integers, version.integers);
    }
  }
  