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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * Copyright 2004 (C) Intalio, Inc. All Rights Reserved.
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 * $Id$
 */
package org.exolab.castor.xml.handlers;

import java.sql.Timestamp;
import java.util.Date;

import org.exolab.castor.mapping.GeneralizedFieldHandler;

/**
 * An implementation of GeneralizedFieldHandler for java.sql.Timestamp.
 *
 * @author <a href="kvisco@intalio.com">Keith Visco</a>
 * @version $Revision$ $Date: 2006-04-14 04:14:43 -0600 (Fri, 14 Apr 2006) $
 * @see org.exolab.castor.mapping.FieldDescriptor
 * @see org.exolab.castor.mapping.FieldHandler
 */
public class SQLTimestampFieldHandler extends GeneralizedFieldHandler {
    /** Position of the literal 'T' character in an xsd:dateTime. */
    private static final int OFFSET_OF_LITERAL_T = 10;

    /**
     * Creates a new SQLTimestampFieldHandler.
     */
    public SQLTimestampFieldHandler() {
        super();
    }

    /**
     * This method is used to convert the value when the getValue method is
     * called. The getValue method will obtain the actual field value from given
     * 'parent' object. This convert method is then invoked with the field's
     * value. The value returned from this method will be the actual value
     * returned by getValue method.
     *
     * @param value the object value to convert after performing a get operation
     * @return the converted value.
     */
    public Object convertUponGet(final Object value) {
        //-- no conversion necessary for marshaling
        return value;
    } //-- convertUponGet

    /**
     * This method is used to convert the value when the setValue method is
     * called. The setValue method will call this method to obtain the converted
     * value. The converted value will then be used as the value to set for the
     * field.
     *
     * @param value the object value to convert before performing a set
     *        operation
     * @return the converted value.
     */
    public Object convertUponSet(final Object value) {
        if (value == null) {
            return null;
        }

        Timestamp timestamp = null;

        // XML Schema compatibility: If 'T' exists at the correct spot,
        // then we most likely have an XML Schema dateTime format.
        String str = value.toString();
        if (str.indexOf('T') == OFFSET_OF_LITERAL_T) {
            try {
                Date date = DateFieldHandler.parse(str);
                timestamp = new Timestamp(date.getTime());
            } catch (java.text.ParseException px) {
                throw new IllegalStateException(px.getMessage());
            }
        } else {
            timestamp = Timestamp.valueOf(str);
        }
        return timestamp;
    } //-- convertUponSet;

    /**
     * Returns the class type for the field that this GeneralizedFieldHandler
     * converts to and from. This should be the type that is used in the object
     * model.
     *
     * @return the class type of of the field
     */
    public Class getFieldType() {
        return java.sql.Timestamp.class;
    } //-- getFieldType

    /**
     * Creates a new instance of the object described by this field.
     *
     * @param parent The object for which the field is created
     * @return A new instance of the field's value
     * @throws IllegalStateException This field is a simple type and cannot be
     *         instantiated
     */
    public Object newInstance(final Object parent) throws IllegalStateException {
        return new java.sql.Timestamp(0);
    }

} //-- SQLTimestampFieldHandler