Java(TM) Boutique - Tutorial - Data Validation with the Spring Framework

Listing 1: Conversion from the java.lang.String to the java.util.Date is done using the standard Java bean�s property editor, shown here.

<Simple Date Editor>
package jbriscoe.article.spring.validation;

import java.beans.PropertyEditorSupport;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class SimpleDateEditor extends PropertyEditorSupport {

  private DateFormat dateFormat;
  private Boolean allowEmpty;
  private Log log = LogFactory.getLog(getClass());

  public SimpleDateEditor(final DateFormat dateFormat, final Boolean allowEmpty) {
    this.dateFormat = dateFormat;
    this.allowEmpty = allowEmpty;
  }
  public String getAsText() {
    return (getValue() == null ? "" : this.dateFormat.format((Date) getValue()));
  }
  public void setAsText(final String text) throws IllegalArgumentException {
    if (this.allowEmpty.equals(Boolean.TRUE) && StringUtils.isEmpty(text)) {
      setValue(null);
    } else {
	try {
	  setValue(this.dateFormat.parse(text));
	} catch (final ParseException e) {
	  log.error("Spring configuration error.  Unable to parse date.", e);
	}
    }
  }
}

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