DateDescriptor

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package org.exolab.castor.types;

import org.exolab.castor.mapping.FieldDescriptor;
import org.exolab.castor.mapping.ValidityException;
import org.exolab.castor.xml.NodeType;
import org.exolab.castor.xml.XMLFieldDescriptor;
import org.exolab.castor.xml.XMLFieldHandler;
import org.exolab.castor.xml.util.XMLFieldDescriptorImpl;

/**
 * The Date Descriptor.
 *
 * @author <a href="blandin@intalio.com">Arnaud Blandin</a>
 * @author <a href="kvisco@intalio.com">Keith Visco</a>
 * @version $Revision$ $Date: 2006-04-13 06:47:36 -0600 (Thu, 13 Apr 2006) $
 * @see TimeDurationDescriptor
 */
public class DateDescriptor extends BaseDescriptor {

  /** The name of the XML element. */
  private static final String XML_NAME = "date";
  /** Our field descriptor. */
  private static final XMLFieldDescriptorImpl CONTENT_DESCRIPTOR;
  /** Our field descriptor array. Lists the fields we describe. */
  private static final FieldDescriptor[] FIELDS;

  static {
    CONTENT_DESCRIPTOR =
        new XMLFieldDescriptorImpl(String.class, "content", "content", NodeType.Text);
    CONTENT_DESCRIPTOR.setHandler(new DateDescriptor().new DateFieldHandler());
    FIELDS = new FieldDescriptor[1];
    FIELDS[0] = CONTENT_DESCRIPTOR;
  }

  // ----------------/
  // - Constructors -/
  // ----------------/

  public DateDescriptor() {
    super(XML_NAME, Date.class);
  } // -- DateDescriptor

  // ------------------/
  // - Public Methods -/
  // ------------------/

  /**
   * Returns the XMLFieldDescriptor for the member that should be marshalled as text content.
   *
   * @return the XMLFieldDescriptor for the member that should be marshalled as text content.
   */
  public XMLFieldDescriptor getContentDescriptor() {
    return CONTENT_DESCRIPTOR;
  } // getContentDescriptor

  /**
   * Returns a list of fields represented by this descriptor.
   *
   * @return A list of fields
   */
  public FieldDescriptor[] getFields() {
    return FIELDS;
  } // -- getFields

  /**
   * A specialized FieldHandler for the XML Schema TimeDuration related types
   *
   * @author <a href="blandin@intalio.com">Arnaud Blandin</a>
   * @version $Revision$ $Date: $
   */
  class DateFieldHandler extends XMLFieldHandler {

    // ----------------/
    // - Constructors -/
    // ----------------/

    /**
     * Creates a new TimeFieldHandler
     */
    public DateFieldHandler() {
      super();
    } // -- TimeFieldHandler

    // ------------------/
    // - Public Methods -/
    // ------------------/

    /**
     * Returns the value of the field associated with this descriptor from the given target object.
     *
     * @param target the object to get the value from
     * @return the value of the field associated with this descriptor from the given target object.
     * @throws IllegalStateException The Java object has changed and is no longer supported by this
     *         handler, or the handler is not compatiable with the Java object
     */
    public Object getValue(Object target) throws java.lang.IllegalStateException {
      // TODO: check for TimeDuration class -- add later
      Date date = (Date) target;

      return date.toString();
    } // -- getValue

    /**
     * Sets the value of the field associated with this descriptor.
     *
     * @param target the object in which to set the value
     * @param value the value of the field
     * @throws IllegalStateException The Java object has changed and is no longer supported by this
     *         handler, or the handler is not compatiable with the Java object
     */
    public void setValue(Object target, Object value) throws java.lang.IllegalStateException {
      if (!(target instanceof Date)) {
        String err =
            "DateDescriptor#setValue: expected Date, received instead: " + target.getClass();
        throw new IllegalStateException(err);
      }

      Date dateTarget = (Date) target;

      if (value == null) {
        String err = "DateDescriptor#setValue: null value.";
        throw new IllegalStateException(err);
      }

      // -- update current instance of time with new time
      try {
        Date temp = Date.parseDate(value.toString());
        dateTarget.setCentury(temp.getCentury());
        dateTarget.setYear(temp.getYear());
        dateTarget.setMonth(temp.getMonth());
        dateTarget.setDay(temp.getDay());
        if (temp.isUTC()) {
          dateTarget.setUTC();
          dateTarget.setZone(temp.getZoneHour(), temp.getZoneMinute());
          dateTarget.setZoneNegative(temp.isZoneNegative());
        }
      } catch (java.text.ParseException ex) {
        String err = "DateDescriptor#setValue: wrong value\n" + ex.getMessage();
        throw new IllegalStateException(err);
      }
    } // -- setValue

    public void resetValue(Object target) throws java.lang.IllegalStateException {
      // nothing to do?
    }

    /**
     * Checks the field validity. Returns successfully if the field can be stored, is valid, etc,
     * throws an exception otherwise.
     *
     * @param object The object
     * @throws ValidityException The field is invalid, is required and null, or any other validity
     *         violation
     * @throws IllegalStateException The Java object has changed and is no longer supported by this
     *         handler, or the handler is not compatiable with the Java object
     */
    public void checkValidity(Object object) throws ValidityException, IllegalStateException {
      // nothing to do?
    } // -- checkValidity

    /**
     * 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(Object parent) throws IllegalStateException {
      return new Date();
    } // -- newInstance

  } // -- DateFieldHandler

} // -- DateDescriptor