Mutable Integer : Mutable « Data Type « Java

1. Java
2. Data Type
3. Mutable

Mutable Integer

    

/**
 * created Aug 13, 2004
 * 
 * @by Thorsten Meinl (Thorsten.Meinl@informatik.uni-erlangen.de)
 *
 * Copyright 2006 Thorsten Meinl
 *
 * This file is part of parsemis.
 *
 * Licence: 
 *  LGPL: http://www.gnu.org/licenses/lgpl.html
 *   EPL: http://www.eclipse.org/org/documents/epl-v10.php
 *   See the LICENSE file in the project's top-level directory for details.
 */
//package de.parsemis.utils;

/**
 * This class is the same as Integer but the stored value can be changed.
 * 
 * @author Thorsten Meinl (Thorsten.Meinl@informatik.uni-erlangen.de)
 * 
 */
public class MutableInteger extends Number implements
    Comparable<MutableInteger>, SynchronizedCounter {
  private static final long serialVersionUID = 532556164094282571L;

  private int m_value;

  /**
   * Creates a new MutableInteger with the given initial value.
   * 
   * @param value
   *            the value
   */
  public MutableInteger(final int value) {
    m_value = value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Comparable#compareTo(java.lang.Object)
   */
  public int compareTo(final MutableInteger o) {
    return m_value - o.m_value;
  }

  /**
   * Decrements the value by one.
   * 
   * @return the new value
   */
  public int dec() {
    return --m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Number#doubleValue()
   */
  @Override
  public double doubleValue() {
    return m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#equals(java.lang.Object)
   */
  @Override
  public boolean equals(final Object obj) {
    if (obj == null || !(obj instanceof MutableInteger)) {
      return false;
    }
    return m_value == ((MutableInteger) obj).m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Number#floatValue()
   */
  @Override
  public float floatValue() {
    return m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#hashCode()
   */
  @Override
  public int hashCode() {
    return m_value;
  }

  /**
   * Increments the value by one.
   * 
   * @return the new value
   */
  public int inc() {
    return ++m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Number#intValue()
   */
  @Override
  public int intValue() {
    return m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Number#longValue()
   */
  @Override
  public long longValue() {
    return m_value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.parsemis.utils.Counter#next()
   */
  public synchronized int next() {
    return m_value++;
  }

  /**
   * Sets the value to a new value
   * 
   * @param value
   *            the new value
   */
  public void setValue(final int value) {
    m_value = value;
  }
}

interface SynchronizedCounter {
  public int next();
}

   
    
    
    
  

Related examples in the same category