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147 lines
4.1 KiB
147 lines
4.1 KiB
/*
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* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.print.attribute;
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import java.io.Serializable;
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import java.util.Date;
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/**
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* Class DateTimeSyntax is an abstract base class providing the common
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* implementation of all attributes whose value is a date and time.
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* <P>
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* Under the hood, a date-time attribute is stored as a value of class <code>
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* java.util.Date</code>. You can get a date-time attribute's Date value by
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* calling {@link #getValue() getValue()}. A date-time attribute's
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* Date value is established when it is constructed (see {@link
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* #DateTimeSyntax(Date) DateTimeSyntax(Date)}). Once
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* constructed, a date-time attribute's value is immutable.
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* <P>
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* To construct a date-time attribute from separate values of the year, month,
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* day, hour, minute, and so on, use a <code>java.util.Calendar</code>
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* object to construct a <code>java.util.Date</code> object, then use the
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* <code>java.util.Date</code> object to construct the date-time attribute.
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* To convert
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* a date-time attribute to separate values of the year, month, day, hour,
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* minute, and so on, create a <code>java.util.Calendar</code> object and
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* set it to the <code>java.util.Date</code> from the date-time attribute. Class
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* DateTimeSyntax stores its value in the form of a <code>java.util.Date
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* </code>
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* rather than a <code>java.util.Calendar</code> because it typically takes
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* less memory to store and less time to compare a <code>java.util.Date</code>
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* than a <code>java.util.Calendar</code>.
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* <P>
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*
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* @author Alan Kaminsky
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*/
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public abstract class DateTimeSyntax implements Serializable, Cloneable {
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private static final long serialVersionUID = -1400819079791208582L;
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// Hidden data members.
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/**
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* This date-time attribute's<code>java.util.Date</code> value.
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* @serial
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*/
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private Date value;
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// Hidden constructors.
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/**
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* Construct a new date-time attribute with the given
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* <code>java.util.Date </code> value.
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*
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* @param value <code>java.util.Date</code> value.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <CODE>theValue</CODE> is null.
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*/
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protected DateTimeSyntax(Date value) {
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if (value == null) {
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throw new NullPointerException("value is null");
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}
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this.value = value;
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}
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// Exported operations.
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/**
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* Returns this date-time attribute's <code>java.util.Date</code>
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* value.
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* @return the Date.
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*/
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public Date getValue() {
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return new Date (value.getTime());
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}
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// Exported operations inherited and overridden from class Object.
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/**
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* Returns whether this date-time attribute is equivalent to the passed in
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* object. To be equivalent, all of the following conditions must be true:
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* <OL TYPE=1>
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* <LI>
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* <CODE>object</CODE> is not null.
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* <LI>
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* <CODE>object</CODE> is an instance of class DateTimeSyntax.
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* <LI>
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* This date-time attribute's <code>java.util.Date</code> value and
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* <CODE>object</CODE>'s <code>java.util.Date</code> value are
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* equal. </OL>
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*
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* @param object Object to compare to.
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*
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* @return True if <CODE>object</CODE> is equivalent to this date-time
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* attribute, false otherwise.
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*/
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public boolean equals(Object object) {
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return (object != null &&
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object instanceof DateTimeSyntax &&
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value.equals(((DateTimeSyntax) object).value));
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}
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/**
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* Returns a hash code value for this date-time attribute. The hashcode is
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* that of this attribute's <code>java.util.Date</code> value.
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*/
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public int hashCode() {
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return value.hashCode();
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}
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/**
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* Returns a string value corresponding to this date-time attribute.
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* The string value is just this attribute's
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* <code>java.util.Date</code> value
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* converted to a string.
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*/
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public String toString() {
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return "" + value;
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}
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}
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