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ModifiableInteger.java

/* ==========================================
 * JGraphT : a free Java graph-theory library
 * ==========================================
 *
 * Project Info:  http://jgrapht.sourceforge.net/
 * Project Lead:  Barak Naveh (http://sourceforge.net/users/barak_naveh)
 *
 * (C) Copyright 2003-2004, by Barak Naveh and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */
/* ----------------------
 * ModifiableInteger.java
 * ----------------------
 *
 * (C) Copyright 2002-2004, by Barak Naveh and Contributors.
 *
 * Original Author:  Barak Naveh
 * Contributor(s):   -
 *
 * $Id: ModifiableInteger.java,v 1.3 2005/07/17 05:40:49 perfecthash Exp $
 *
 * Changes
 * -------
 * 2004-05-27 : Initial version (BN);
 *
 */
package org._3pq.jgrapht.util;

/**
 * The <code>ModifiableInteger</code> class wraps a value of the primitive type
 * <code>int</code> in an object, similarly to {@link java.lang.Integer}. An
 * object of type <code>ModifiableInteger</code> contains a single field whose
 * type is <code>int</code>.
 * 
 * <p>
 * Unlike <code>java.lang.Integer</code>, the int value which the
 * ModifiableInteger represents can be modified. It becomes useful when used
 * together with the collection framework. For example, if you want to have a
 * {@link java.util.List} of counters. You could use <code>Integer</code> but
 * that would have became wasteful and inefficient if you frequently had to
 * update the counters.
 * </p>
 * 
 * <p>
 * WARNING: Because instances of this class are mutable, great care must be
 * exercised if used as keys of a {@link java.util.Map} or as values in a
 * {@link java.util.Set} in a manner that affects equals comparisons while the
 * instances are keys in the map (or values in the set). For more see
 * documentation of <code>Map</code> and <code>Set</code>.
 * </p>
 *
 * @author Barak Naveh
 *
 * @since May 27, 2004
 */
00069 public class ModifiableInteger extends Number implements Comparable {
    private static final long serialVersionUID = 3618698612851422261L;

    /** The int value represented by this <code>ModifiableInteger</code>. */
00073     public int value;

    /**
     * <b>!!! DON'T USE - Use the {@link #ModifiableInteger(int)} constructor
     * instead !!!</b>
     * 
     * <p>
     * This constructor is for the use of java.beans.XMLDecoder
     * deserialization. The constructor is marked as 'deprecated' to indicate
     * to the programmer against using it by mistake.
     * </p>
     *
     * @deprecated not really deprecated, just marked so to avoid mistaken use.
     */
00087     public ModifiableInteger(  ) {}


    /**
     * Constructs a newly allocated <code>ModifiableInteger</code> object that
     * represents the specified <code>int</code> value.
     *
     * @param value the value to be represented by the
     *        <code>ModifiableInteger</code> object.
     */
00097     public ModifiableInteger( int value ) {
        this.value = value;
    }

    /**
     * Sets a new value for this modifiable integer.
     *
     * @param value the new value to set.
     */
00106     public void setValue( int value ) {
        this.value = value;
    }


    /**
     * Returns the value of this object, similarly to {@link #intValue()}. This
     * getter is NOT redundant. It is used for serialization by
     * java.beans.XMLEncoder.
     *
     * @return the value.
     */
00118     public int getValue(  ) {
        return this.value;
    }


    /**
     * Compares two <code>ModifiableInteger</code> objects numerically.
     *
     * @param anotherInteger the <code>ModifiableInteger</code> to be compared.
     *
     * @return the value <code>0</code> if this <code>ModifiableInteger</code>
     *         is equal to the argument <code>ModifiableInteger</code>; a
     *         value less than <code>0</code> if this
     *         <code>ModifiableInteger</code> is numerically less than the
     *         argument <code>ModifiableInteger</code>; and a value greater
     *         than <code>0</code> if this <code>ModifiableInteger</code> is
     *         numerically greater than the argument
     *         <code>ModifiableInteger</code> (signed comparison).
     */
00137     public int compareTo( ModifiableInteger anotherInteger ) {
        int thisVal    = this.value;
        int anotherVal = anotherInteger.value;

        return thisVal < anotherVal ? -1 : ( thisVal == anotherVal ? 0 : 1 );
    }


    /**
     * Compares this <code>ModifiableInteger</code> object to another object.
     * If the object is an <code>ModifiableInteger</code>, this function
     * behaves like <code>compareTo(Integer)</code>.  Otherwise, it throws a
     * <code>ClassCastException</code> (as <code>ModifiableInteger</code>
     * objects are only comparable to other <code>ModifiableInteger</code>
     * objects).
     *
     * @param o the <code>Object</code> to be compared.
     *
     * @return the value <code>0</code> if the argument is a
     *         <code>ModifiableInteger</code> numerically equal to this
     *         <code>ModifiableInteger</code>; a value less than
     *         <code>0</code>  if the argument is a
     *         <code>ModifiableInteger</code> numerically  greater than this
     *         <code>ModifiableInteger</code>; and a value  greater than
     *         <code>0</code> if the argument is a
     *         <code>ModifiableInteger</code> numerically less than this
     *         <code>ModifiableInteger</code>.
     *
     * @see java.lang.Comparable#compareTo(java.lang.Object)
     */
00167     public int compareTo( Object o ) {
        return compareTo( (ModifiableInteger) o );
    }


    /**
     * @see Number#doubleValue()
     */
00175     public double doubleValue(  ) {
        return this.value;
    }


    /**
     * Compares this object to the specified object.  The result is
     * <code>true</code> if and only if the argument is not <code>null</code>
     * and is an <code>ModifiableInteger</code> object that contains the same
     * <code>int</code> value as this object.
     *
     * @param o the object to compare with.
     *
     * @return <code>true</code> if the objects are the same;
     *         <code>false</code> otherwise.
     */
00191     public boolean equals( Object o ) {
        if( o instanceof ModifiableInteger ) {
            return this.value == ( (ModifiableInteger) o ).value;
        }

        return false;
    }


    /**
     * @see Number#floatValue()
     */
00203     public float floatValue(  ) {
        return this.value;
    }


    /**
     * Returns a hash code for this <code>ModifiableInteger</code>.
     *
     * @return a hash code value for this object, equal to the  primitive
     *         <code>int</code> value represented by this
     *         <code>ModifiableInteger</code> object.
     */
00215     public int hashCode(  ) {
        return this.value;
    }


    /**
     * @see Number#intValue()
     */
00223     public int intValue(  ) {
        return this.value;
    }


    /**
     * @see Number#longValue()
     */
00231     public long longValue(  ) {
        return this.value;
    }


    /**
     * Returns an <code>Integer</code> object representing this
     * <code>ModifiableInteger</code>'s value.
     *
     * @return an <code>Integer</code> representation of the value of this
     *         object.
     */
00243     public Integer toInteger(  ) {
        return new Integer( this.value );
    }


    /**
     * Returns a <code>String</code> object representing this
     * <code>ModifiableInteger</code>'s value. The value is converted to
     * signed decimal representation and returned as a string, exactly as if
     * the integer value were given as an argument to the {@link
     * java.lang.Integer#toString(int)} method.
     *
     * @return a string representation of the value of this object in
     *         base&nbsp;10.
     */
00258     public String toString(  ) {
        return String.valueOf( this.value );
    }
}

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