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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.

 Under the hood, a date-time attribute is stored as a value of class java.util.Date. You can get a date-time attribute's Date value by calling getValue(). A date-time attribute's Date value is established when it is constructed (see DateTimeSyntax(Date)). Once constructed, a date-time attribute's value is immutable. 
 To construct a date-time attribute from separate values of the year, month, day, hour, minute, and so on, use a java.util.Calendar object to construct a java.util.Date object, then use the 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 java.util.Calendar object and set it to the java.util.Date from the date-time attribute. Class DateTimeSyntax stores its value in the form of a java.util.Date rather than a java.util.Calendar because it typically takes less memory to store and less time to compare a java.util.Date than a java.util.Calendar. 
Author: Alan Kaminsky
/**
 * 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 java.util.Date value. 
@serial
/**
     * 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 java.util.Date value. 
Params:
  • value –  java.util.Date value.
Throws:
/**
     * 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 java.util.Date value. 
Returns:the Date.
/**
     * 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:

    

  1.  object is not null. 
  2.  object is an instance of class DateTimeSyntax. 
  3.  This date-time attribute's java.util.Date value and object's java.util.Date value are equal. 


Params:
  • object –  Object to compare to.
Returns: True if object is equivalent to this date-time attribute, false otherwise.
/**
     * 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 java.util.Date 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 java.util.Date value converted to a string. 
/**
     * 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;
    }

}