org.javarosa.core.model.utils

Class QuestionPreloader

java.lang.Object

org.javarosa.core.model.utils.QuestionPreloader

public class QuestionPreloader
extends Object

The Question Preloader is responsible for maintaining a set of handlers which are capable of parsing 'preload' elements, and their parameters, and returning IAnswerData objects.

Author:

Clayton Sims

Constructor Summary

Constructors

Constructor and Description
QuestionPreloader() Creates a new Preloader with default handlers

Method Summary

Modifier and Type	Method and Description
void	addPreloadHandler(IPreloadHandler handler) Adds a new preload handler to this preloader.
IAnswerData	getQuestionPreload(String preloadType, String preloadParams) Returns the IAnswerData preload value for the given preload type and parameters
boolean	questionPostProcess(TreeElement node, String preloadType, String params)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QuestionPreloader

public QuestionPreloader()

Creates a new Preloader with default handlers

Method Detail

addPreloadHandler

public void addPreloadHandler(IPreloadHandler handler)

Adds a new preload handler to this preloader.

Parameters:

handler - an IPreloadHandler that can handle a preload type

getQuestionPreload

public IAnswerData getQuestionPreload(String preloadType,
                                      String preloadParams)

Returns the IAnswerData preload value for the given preload type and parameters

Parameters:

preloadType - The type of the preload to be returned

preloadParams - Parameters for the preload handler

Returns:

An IAnswerData corresponding to a pre-loaded value for the given Arguments. null if no preload could successfully be derived due to either the lack of a handler, or to invalid parameters

questionPostProcess

public boolean questionPostProcess(TreeElement node,
                                   String preloadType,
                                   String params)