/*
 * @(#)$Id: IDateTimeValueType.java,v 1.9 2002/09/08 20:18:55 kk122374 Exp $
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package com.sun.msv.datatype.xsd.datetime;

import java.util.Calendar;

/**
 * Interface as value type of DateTimeType
 * 
 * @author Kohsuke KAWAGUCHI
 */
public interface IDateTimeValueType extends java.io.Serializable {
	BigDateTimeValueType getBigValue();
	
	/** returns the result of addition of this object and TimeDuration.
	 * 
	 * this object will not be mutated.
	 */
	IDateTimeValueType add( ITimeDurationValueType duration );
	
	/** gets the normalized IDateTimeValueType.
	 * 
	 * normalized value always has GMT timezone or no timezone
	 */
	IDateTimeValueType normalize();
	
	/** compare two DateTimeValueType as defined in
	 *  com.sun.msv.datatype/Comparator
	 */
	int compare( IDateTimeValueType rhs );
    
    /**
     * Approximates the value represented by this object into a Calendar object.
     * This conversion may lose accuracy.
     */
    Calendar toCalendar();
}