001/* DateTimeSyntax.java -- 
002   Copyright (C) 2003, 2005 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package javax.print.attribute;
039
040import java.io.Serializable;
041import java.util.Date;
042
043/**
044 * <code>DateTimeSyntax</code> is the abstract base class of all attribute 
045 * classes having a date and a time as value.
046 * 
047 * @author Michael Koch (konqueror@gmx.de)
048 */
049public abstract class DateTimeSyntax implements Cloneable, Serializable
050{
051  private static final long serialVersionUID = -1400819079791208582L;
052  
053  private Date value;
054  
055  /**
056   * Creates a <code>DateTimeSyntax</code> with a given value.
057   *
058   * @param value the date for this syntax
059   *
060   * @exception NullPointerException if value is null
061   */
062  protected DateTimeSyntax(Date value)
063  {
064    if (value == null)
065      throw new NullPointerException("value may not be null");
066
067    this.value = value;
068  }
069
070  /**
071   * Returns the date value of this object.
072   *
073   * @return The date value.
074   */
075  public Date getValue()
076  {
077    return value;
078  }
079
080  /**
081   * Tests if the given object is equal to this one.
082   * 
083   * @param obj the object to test
084   *
085   * @return <code>true</code> if both objects are equal, 
086   * <code>false</code> otherwise.
087   */
088  public boolean equals(Object obj)
089  {
090    if (! (obj instanceof DateTimeSyntax))
091      return false;
092
093    return value.equals(((DateTimeSyntax) obj).getValue());
094  }
095
096  /**
097   * Returns the hashcode for this object.
098   *
099   * @return The hashcode.
100   */
101  public int hashCode()
102  {
103    return value.hashCode();
104  }
105  
106  /**
107   * Returns the string representation for this object.
108   *
109   * @return The string representation.
110   */
111  public String toString() 
112  {
113    return value.toString();    
114  }
115}