001    /* DateTimeSyntax.java --
002       Copyright (C) 2003, 2005 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package javax.print.attribute;
039    
040    import java.io.Serializable;
041    import 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     */
049    public 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    }