/* DateTimeSyntax.java -- 
   Copyright (C) 2003, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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General Public License for more details.

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02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package javax.print.attribute;

import java.io.Serializable;
import java.util.Date;

/**
 * <code>DateTimeSyntax</code> is the abstract base class of all attribute 
 * classes having a date and a time as value.
 * 
 * @author Michael Koch (konqueror@gmx.de)
 */
public abstract class DateTimeSyntax implements Cloneable, Serializable
{
  private static final long serialVersionUID = -1400819079791208582L;
  
  private Date value;
  
  /**
   * Creates a <code>DateTimeSyntax</code> with a given value.
   *
   * @param value the date for this syntax
   *
   * @exception NullPointerException if value is null
   */
  protected DateTimeSyntax(Date value)
  {
    if (value == null)
      throw new NullPointerException("value may not be null");

    this.value = value;
  }

  /**
   * Returns the date value of this object.
   *
   * @return The date value.
   */
  public Date getValue()
  {
    return value;
  }

  /**
   * Tests if the given object is equal to this one.
   * 
   * @param obj the object to test
   *
   * @return <code>true</code> if both objects are equal, 
   * <code>false</code> otherwise.
   */
  public boolean equals(Object obj)
  {
    if (! (obj instanceof DateTimeSyntax))
      return false;

    return value.equals(((DateTimeSyntax) obj).getValue());
  }

  /**
   * Returns the hashcode for this object.
   *
   * @return The hashcode.
   */
  public int hashCode()
  {
    return value.hashCode();
  }
  
  /**
   * Returns the string representation for this object.
   *
   * @return The string representation.
   */
  public String toString() 
  {
    return value.toString();    
  }
}