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* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 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}. You can get a date-time attribute's Date value by
* calling {@link #getValue() getValue()}. A date-time attribute's
* Date value is established when it is constructed (see {@link
* #DateTimeSyntax(Date) DateTimeSyntax(Date)}). 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}
* object to construct a {@code java.util.Date} object, then use the
* {@code java.util.Date} 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} object and
* set it to the {@code java.util.Date} from the date-time attribute. Class
* DateTimeSyntax stores its value in the form of a {@code java.util.Date}
* rather than a {@code java.util.Calendar} because it typically takes
* less memory to store and less time to compare a {@code java.util.Date}
* than a {@code java.util.Calendar}.
*
* @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} value.
* @serial
*/
private Date value;
// Hidden constructors.
/**
* Construct a new date-time attribute with the given
* {@code java.util.Date} value.
*
* @param value {@code java.util.Date} value.
*
* @exception NullPointerException
* (unchecked exception) Thrown if {@code theValue} 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}
* 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} is not null.
* <LI>
* {@code object} is an instance of class DateTimeSyntax.
* <LI>
* This date-time attribute's {@code java.util.Date} value and
* {@code object}'s {@code java.util.Date} value are
* equal. </OL>
*
* @param object Object to compare to.
*
* @return True if {@code object} 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} 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} value
* converted to a string.
*/
public String toString() {
return "" + value;
}
}