/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <p>
*/
package org.olat.ims.qti.process.elements;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Element;
import org.olat.ims.qti.container.ItemContext;
import org.olat.ims.qti.container.Output;
import org.olat.ims.qti.container.Variable;
import org.olat.ims.qti.container.Variables;
import org.olat.ims.qti.container.qtielements.Hint;
import org.olat.ims.qti.container.qtielements.Solution;
import org.olat.ims.qti.process.QTIHelper;
/**
*
*/
public class QTI_respcondition {
/**
* Response Condition
*
* ims qti 1.2.1 respcondition
* <!ELEMENT respcondition (qticomment? , conditionvar , setvar* , displayfeedback*)>
* <!ELEMENT conditionvar (not | and | or | unanswered | other | varequal | varlt | varlte |
* vargt | vargte | varsubset | varinside | varsubstring | durequal | durlt | durlte | durgt | durgte)+>
*
* <!ELEMENT setvar (#PCDATA)>
* <!ATTLIST setvar %I_VarName; action (Set | Add | Subtract | Multiply | Divide ) 'Set' >
* mit I_VarName = varname CDATA 'SCORE'
* <setvar action="Set" varname="SCORE">10</setvar>
*
* <!ELEMENT displayfeedback (#PCDATA)>
* <!ATTLIST displayfeedback feedbacktype (Response | Solution | Hint ) 'Response'
%I_LinkRefId; >
* mit I_LinkRefId = linkrefid CDATA #REQUIRED"
* e.g. <displayfeedback feedbacktype = "Solution" linkrefid = "CorrectSoln"/>
*
* ??? should be ? ? <conditionvar><or>...</or><varequal>...</varequal></conditionvar> does not make sense
* but <conditionvar>
<varequal respident = "Word-1">KITTENS</varequal>
<varequal respident = "Word-2">HATS</varequal>
</conditionvar> makes sense, so treat members of conditionvar as children of an "and" element
* @param node_respcond
*/
public boolean process(Element el_respcond, ItemContext itc, EvalContext ect) {
// 1. evaluate conditionvar
// 2. if true, set variables
// and setCurrentDisplayFeedback (TODO: assuming there is only one displayfeedback in a respcondition)
Variables vars;
Element el_condVar = (Element) el_respcond.selectSingleNode("conditionvar");
String respcondtitle = el_respcond.attributeValue("title");
QTI_and qtiAnd = QTIHelper.getQTI_and();
boolean fulfilled = qtiAnd.eval(el_condVar, itc, ect);
// continue to set variables and display feedback if question was answered correctly
if (fulfilled) {
vars = itc.getVariables();
List setvars = el_respcond.selectNodes("setvar");
for (Iterator iter = setvars.iterator(); iter.hasNext();) {
Element element = (Element) iter.next();
String action = element.attributeValue("action");
String varName = element.attributeValue("varname");
if (varName == null) varName = "SCORE";
varName.trim();
String varVal = element.getText();
Variable var = vars.getVariable(varName);
if (var == null) throw new RuntimeException("var "+varName+" is in setvar, but was not declared ");
if (action.equals("Set")) {
var.setValue(varVal);
} else {
// we are doing Integer or float arithmetic
// Add | Subtract | Multiply | Divide
if (action.equals("Add")) {
var.add(varVal);
} else if (action.equals("Subtract")) {
var.subtract(varVal);
} else if (action.equals("Multiply")) {
var.multiply(varVal);
} else if (action.equals("Divide")) {
var.divide(varVal);
}
}
}
// set displayfeedback
//<displayfeedback feedbacktype = "Response" linkrefid = "Correct"/>
//<!ATTLIST displayfeedback feedbacktype (Response | Solution | Hint ) 'Response' %I_LinkRefId; >
Output output = itc.getOutput();
List fbs = el_respcond.selectNodes("displayfeedback");
for (Iterator it_fbs = fbs.iterator(); it_fbs.hasNext();) {
Element el_dispfb = (Element) it_fbs.next();
String linkRefId = el_dispfb.attributeValue("linkrefid"); // must exist (dtd)
String feedbacktype = el_dispfb.attributeValue("feedbacktype"); // must exist (dtd)
Element el_resolved =
(Element) itc.getEl_item().selectSingleNode(".//itemfeedback[@ident='" + linkRefId + "']");
if (el_resolved == null) continue;
if (feedbacktype.equals("Response")) {
// additional (olat) rule:
// we want to render the original answer again in the simple case where the respcondition was generated
// by the olat export and contains only one varequal.
/*
<response_label ident = "2">
<flow_mat>
<material>
<mattext texttype="text/html">...</mattext>
</material>
</flow_mat>
</response_label>
...
<respcondition title="_olat_resp_feedback" continue="Yes">
<conditionvar>
<varequal respident="Frage6549" case="Yes">2</varequal>
</conditionvar>
<displayfeedback linkrefid="2"/>
</respcondition>
In this case, it is possible (and wished) to trace the feedback back to the answer which triggered this feedback.
Such a respcondition is identified by the title which is exactly "_olat_resp_feedback".
*/
Element el_chosenanswer = null;
if (respcondtitle != null && respcondtitle.equals("_olat_resp_feedback")) {
Element el_vareq = (Element) el_respcond.selectSingleNode(".//varequal");
String answerident = el_vareq.getText();
el_chosenanswer = (Element) itc.getEl_item().selectSingleNode(".//response_label[@ident='" + answerident + "']//material");
}
output.addItem_El_response(el_chosenanswer,el_resolved); // give the whole itemfeedback to render
} else if (feedbacktype.equals("Solution")) {
Element el_solution = (Element) el_resolved.selectSingleNode(".//solution");
if (el_solution != null) output.setSolution(new Solution(el_solution));
} else if (feedbacktype.equals("Hint")) {
//<!ENTITY % I_FeedbackStyle " feedbackstyle (Complete | Incremental | Multilevel | Proprietary ) 'Complete'">
Element el_hint = (Element) el_resolved.selectSingleNode(".//hint");
output.setHint(new Hint(el_hint));
}
}
}
return fulfilled;
}
}