ex6_34.txt

j2ee core design patterns

Example 6.34 	Auto-populating ContextObject: AutoPopulateRequestContext
// Context Object helper
public class AutoPopulateRequestContext {

  public static void populateBean(Object bean, ServletRequest request) {

    Enumeration enum = request.getParameterNames();

    while ( enum.hasMoreElements()) {
      String parameterName = (String)enum.nextElement();
      if ( PropertyUtils.isWriteable(bean, parameterName)) {

        String values[] = request.getParameterValues(parameterName);
        try {
          if ( values.length == 1 ) {
            PropertyUtils.setSimpleProperty(
            bean, parameterName, values[0]);
          } else {
            for ( int iValue=0; iValue < values.length; iValue++)
              PropertyUtils.setIndexedProperty(
              bean, parameterName, iValue, values[iValue]);
          }
        } catch (IllegalAccessException e) {
          // handle exception
        } catch (InvocationTargetException e) {
          // handle exception
        } catch (NoSuchMethodException e) {
          // handle exception
        }
      }
    }
  }
}