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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.
 */

package com.rapiddweller.common.version;

import com.rapiddweller.common.CollectionUtil;

import java.io.Serializable;
import java.text.ParsePosition;
import java.util.Arrays;
import java.util.List;

/**
 * Represents a software version number.
 * Attention: equals() may return false for instances which are equivalent concerning compareTo(), e.g. 1.0 and 1.0.0.
 * Created at 22.12.2008 16:46:24
 *
 * @author Volker Bergmann
 * @since 0.5.7
 */
public class VersionNumber implements Comparable, Serializable {

  private static final long serialVersionUID = 8411677292851262669L;

  private static final NumberVersionNumberComponent ZERO_COMPONENT = new NumberVersionNumberComponent("0");
  private static final VersionNumberParser PARSER = new VersionNumberParser();

  private final VersionNumberComponent[] components;
  private final String[] delimiters;

  /**
   * Value of version number.
   *
   * @param text the text
   * @return the version number
   */
  public static VersionNumber valueOf(String text) {
    return PARSER.parseObject(text, new ParsePosition(0));
  }

  /**
   * Instantiates a new Version number.
   *
   * @param components the components
   */
  public VersionNumber(List components) {
    this.components = new VersionNumberComponent[components.size() / 2 + 1];
    this.delimiters = new String[components.size() / 2];
    for (int i = 0; i < components.size(); i += 2) {
      Object component = components.get(i);
      if (component instanceof Number) {
        this.components[i / 2] = new NumberVersionNumberComponent(((Number) component).intValue());
      } else {
        this.components[i / 2] = new StringVersionNumberComponent((String) component);
      }
      if (i / 2 < delimiters.length) {
        this.delimiters[i / 2] = (String) components.get(i + 1);
      }
    }
  }

  /**
   * Instantiates a new Version number.
   *
   * @param components the components
   * @param delimiters the delimiters
   */
  public VersionNumber(List components, List delimiters) {
    this.components = CollectionUtil.toArray(components, VersionNumberComponent.class);
    this.delimiters = CollectionUtil.toArray(delimiters, String.class);
  }

  @Override
  public int compareTo(VersionNumber that) {
    int n = Math.min(this.components.length, that.components.length);
    for (int i = 0; i < n; i++) {
      int componentComparation = this.components[i].compareTo(that.components[i]);
      if (componentComparation != 0) {
        return componentComparation;
      }
    }
    if (this.components.length == that.components.length) {
      return 0;
    } else if (this.components.length < that.components.length) {
      return -checkAdditionalComponents(that.components, this.components.length);
    } else {
      return checkAdditionalComponents(this.components, that.components.length);
    }
  }

  private static int checkAdditionalComponents(VersionNumberComponent[] components, int from) {
    for (int i = from; i < components.length; i++) {
      int comparation = components[i].compareTo(ZERO_COMPONENT);
      if (comparation != 0) {
        return comparation;
      }
    }
    return 0;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    for (int i = 0; i < components.length; i++) {
      builder.append(components[i]);
      if (i < delimiters.length) {
        builder.append(delimiters[i]);
      }
    }
    return builder.toString();
  }

  @Override
  public int hashCode() {
    return 31 * Arrays.hashCode(components) + Arrays.hashCode(delimiters);
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }
    VersionNumber other = (VersionNumber) obj;
    return (Arrays.equals(components, other.components) && Arrays.equals(delimiters, other.delimiters));
  }

}
    

    

    

            

    

            



    
    






    
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