org.apache.commons.beanutils.NestedNullException Java Examples

/**
 * Return whether or not an attribute is writeable. This method is aware that that Collections may be involved and
 * handles them
 * consistently with the way in which OJB handles specifying the attributes of elements of a Collection.
 *
 * @param object
 * @param property
 * @return
 * @throws IllegalArgumentException
 */
public static boolean isWriteable(Object object, String property,
        PersistenceStructureService persistenceStructureService) throws IllegalArgumentException {
    if (null == object || null == property) {
        throw new IllegalArgumentException("Cannot check writeable status with null arguments.");
    }

	// Try the easy way.
	try {
		if (!(PropertyUtils.isWriteable(object, property))) {
			// If that fails lets try to be a bit smarter, understanding that Collections may be involved.
			return isWriteableHelper(object, property, persistenceStructureService);
		} else {
			return true;
		}
	} catch (NestedNullException nestedNullException) {
		// If a NestedNullException is thrown then the property has a null
		// value.  Call the helper to find the class of the property and
		// get a newInstance of it.
		return isWriteableHelper(object, property, persistenceStructureService);
	}
}
 

private Object getObjectValue(final CsvExportColumn column) {
    final String property = column.getName();
    Object rawValue = null;
    try {
        rawValue = PropertyUtils.getNestedProperty(getData(), property);
    } catch (NestedNullException nne) {
        // do not report, it is just null
    } catch (Exception exp) {
        LOG.error("Unable to read property: " + property, exp);
    }
    return rawValue;
}
 

private static boolean isPropertyReadable(Object bean, String name) {
    try {
        return PropertyUtils.isReadable(bean, name);
    } catch (NestedNullException e) {
        return false;
    }
}
 

private static boolean isPropertyWritable(Object bean, String name) {
    try {
        return PropertyUtils.isWriteable(bean, name);
    } catch (NestedNullException e) {
        return false;
    }
}
 

public Collection getCollection() {
    throw new NestedNullException();
}