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package org.apache.juneau.swaps;

import static org.apache.juneau.internal.ThrowableUtils.*;
import static org.apache.juneau.internal.StringUtils.*;

import javax.xml.datatype.*;

import org.apache.juneau.*;
import org.apache.juneau.swap.*;

/**
 * Transforms {@link XMLGregorianCalendar XMLGregorianCalendars} to ISO8601 date-time {@link String Strings}.
 *
 * <p>
 * Objects are converted to strings using {@link XMLGregorianCalendar#toXMLFormat()}.
 *
 * <p>
 * Strings are converted to objects using {@link DatatypeFactory#newXMLGregorianCalendar(String)}.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jm.Swaps}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public class XMLGregorianCalendarSwap extends StringSwap<XMLGregorianCalendar> {

	private DatatypeFactory dtf;

	/**
	 * Constructor.
	 */
	public XMLGregorianCalendarSwap() {
		try {
			this.dtf = DatatypeFactory.newInstance();
		} catch (DatatypeConfigurationException e) {
			throw runtimeException(e);
		}
	}

	/**
	 * Converts the specified <c>XMLGregorianCalendar</c> to a {@link String}.
	 */
	@Override /* ObjectSwap */
	public String swap(BeanSession session, XMLGregorianCalendar b) throws Exception {
		return b.toXMLFormat();
	}

	/**
	 * Converts the specified {@link String} to an <c>XMLGregorianCalendar</c>.
	 */
	@Override /* ObjectSwap */
	public XMLGregorianCalendar unswap(BeanSession session, String s, ClassMeta<?> hint) throws Exception {
		if (isEmpty(s))
			return null;
		return dtf.newXMLGregorianCalendar(s);
	}
}