java-design-patterns/value-object/src/main/java/com/iluwatar/value/object/HeroStat.java

/**
 * The MIT License
 * Copyright © 2014-2019 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.value.object;

/**
 * HeroStat is a value object
 * 
 * @see <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/doc-files/ValueBased.html">
 * http://docs.oracle.com/javase/8/docs/api/java/lang/doc-files/ValueBased.html
 * </a>
 */
public class HeroStat {

  // Stats for a hero

  private final int strength;
  private final int intelligence;
  private final int luck;

  // All constructors must be private.
  private HeroStat(int strength, int intelligence, int luck) {
    this.strength = strength;
    this.intelligence = intelligence;
    this.luck = luck;
  }

  // Static factory method to create new instances.
  public static HeroStat valueOf(int strength, int intelligence, int luck) {
    return new HeroStat(strength, intelligence, luck);
  }

  public int getStrength() {
    return strength;
  }

  public int getIntelligence() {
    return intelligence;
  }

  public int getLuck() {
    return luck;
  }

  /*
   * Recommended to provide a static factory method capable of creating an instance from the formal
   * string representation declared like this. public static HeroStat parse(String string) {}
   */

  // toString, hashCode, equals

  @Override
  public String toString() {
    return "HeroStat [strength=" + strength + ", intelligence=" + intelligence
        + ", luck=" + luck + "]";
  }

  @Override
  public int hashCode() {
    final var prime = 31;
    var result = 1;
    result = prime * result + intelligence;
    result = prime * result + luck;
    result = prime * result + strength;
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    var other = (HeroStat) obj;
    if (intelligence != other.intelligence) {
      return false;
    }
    if (luck != other.luck) {
      return false;
    }
    if (strength != other.strength) {
      return false;
    }
    return true;
  }

  // The clone() method should not be public. Just don't override it.

}