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* Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.print.attribute;
import java.io.Serializable;
import java.util.Date;
/**
* Class DateTimeSyntax is an abstract base class providing the common
* implementation of all attributes whose value is a date and time.
* <P>
* Under the hood, a date-time attribute is stored as a value of class <code>
* java.util.Date</code>. You can get a date-time attribute's Date value by
* calling {@link #getValue() <CODE>getValue()</CODE>}. A date-time attribute's
* Date value is established when it is constructed (see {@link
* #DateTimeSyntax(Date) <CODE>DateTimeSyntax(Date)</CODE>}). Once
* constructed, a date-time attribute's value is immutable.
* <P>
* To construct a date-time attribute from separate values of the year, month,
* day, hour, minute, and so on, use a <code>java.util.Calendar</code>
* object to construct a <code>java.util.Date</code> object, then use the
* <code>java.util.Date</code> object to construct the date-time attribute.
* To convert
* a date-time attribute to separate values of the year, month, day, hour,
* minute, and so on, create a <code>java.util.Calendar</code> object and
* set it to the <code>java.util.Date</code> from the date-time attribute. Class
* DateTimeSyntax stores its value in the form of a <code>java.util.Date
* </code>
* rather than a <code>java.util.Calendar</code> because it typically takes
* less memory to store and less time to compare a <code>java.util.Date</code>
* than a <code>java.util.Calendar</code>.
* <P>
*
* @author Alan Kaminsky
*/
public abstract class DateTimeSyntax implements Serializable, Cloneable {
private static final long serialVersionUID = -1400819079791208582L;
// Hidden data members.
/**
* This date-time attribute's<code>java.util.Date</code> value.
* @serial
*/
private Date value;
// Hidden constructors.
/**
* Construct a new date-time attribute with the given
* <code>java.util.Date </code> value.
*
* @param value <code>java.util.Date</code> value.
*
* @exception NullPointerException
* (unchecked exception) Thrown if <CODE>theValue</CODE> is null.
*/
protected DateTimeSyntax(Date value) {
if (value == null) {
throw new NullPointerException("value is null");
}
this.value = value;
}
// Exported operations.
/**
* Returns this date-time attribute's <code>java.util.Date</code>
* value.
* @return the Date.
*/
public Date getValue() {
return new Date (value.getTime());
}
// Exported operations inherited and overridden from class Object.
/**
* Returns whether this date-time attribute is equivalent to the passed in
* object. To be equivalent, all of the following conditions must be true:
* <OL TYPE=1>
* <LI>
* <CODE>object</CODE> is not null.
* <LI>
* <CODE>object</CODE> is an instance of class DateTimeSyntax.
* <LI>
* This date-time attribute's <code>java.util.Date</code> value and
* <CODE>object</CODE>'s <code>java.util.Date</code> value are
* equal. </OL>
*
* @param object Object to compare to.
*
* @return True if <CODE>object</CODE> is equivalent to this date-time
* attribute, false otherwise.
*/
public boolean equals(Object object) {
return (object != null &&
object instanceof DateTimeSyntax &&
value.equals(((DateTimeSyntax) object).value));
}
/**
* Returns a hash code value for this date-time attribute. The hashcode is
* that of this attribute's <code>java.util.Date</code> value.
*/
public int hashCode() {
return value.hashCode();
}
/**
* Returns a string value corresponding to this date-time attribute.
* The string value is just this attribute's
* <code>java.util.Date</code> value
* converted to a string.
*/
public String toString() {
return "" + value;
}
}