public boolean evaluateConstraint(TreeReference ref, IAnswerData data) {
if (data == null) return true;
TreeElement node = instance.resolveReference(ref);
Constraint c = node.getConstraint();
if (c == null) return true;
EvaluationContext ec = new EvaluationContext(exprEvalContext, ref);
ec.isConstraint = true;
ec.candidateValue = data;
return c.constraint.eval(instance, ec);
}
public String fillTemplateString(
String template, TreeReference contextRef, Hashtable<String, ?> variables) {
Hashtable args = new Hashtable();
int depth = 0;
Vector outstandingArgs = Localizer.getArgs(template);
while (outstandingArgs.size() > 0) {
for (int i = 0; i < outstandingArgs.size(); i++) {
String argName = (String) outstandingArgs.elementAt(i);
if (!args.containsKey(argName)) {
int ix = -1;
try {
ix = Integer.parseInt(argName);
} catch (NumberFormatException nfe) {
System.err.println("Warning: expect arguments to be numeric [" + argName + "]");
}
if (ix < 0 || ix >= outputFragments.size()) continue;
IConditionExpr expr = (IConditionExpr) outputFragments.elementAt(ix);
EvaluationContext ec = new EvaluationContext(exprEvalContext, contextRef);
ec.setVariables(variables);
String value = expr.evalReadable(this.getInstance(), ec);
args.put(argName, value);
}
}
template = Localizer.processArguments(template, args);
outstandingArgs = Localizer.getArgs(template);
depth++;
if (depth >= TEMPLATING_RECURSION_LIMIT) {
throw new RuntimeException("Dependency cycle in <output>s; recursion limit exceeded!!");
}
}
return template;
}
private void initEvalContext(EvaluationContext ec) {
if (!ec.getFunctionHandlers().containsKey("jr:itext")) {
final FormDef f = this;
ec.addFunctionHandler(
new IFunctionHandler() {
public String getName() {
return "jr:itext";
}
public Object eval(Object[] args) {
String textID = (String) args[0];
try {
String text = f.getLocalizer().getText(textID);
return text == null ? "[itext:" + textID + "]" : text;
} catch (NoSuchElementException nsee) {
return "[nolocale]";
}
}
public Vector getPrototypes() {
Class[] proto = {String.class};
Vector v = new Vector();
v.addElement(proto);
return v;
}
public boolean rawArgs() {
return false;
}
public boolean realTime() {
return false;
}
});
}
/* function to reverse a select value into the display label for that choice in the question it came from
*
* arg 1: select value
* arg 2: string xpath referring to origin question; must be absolute path
*
* this won't work at all if the original label needed to be processed/calculated in some way (<output>s, etc.) (is this even allowed?)
* likely won't work with multi-media labels
* _might_ work for itemsets, but probably not very well or at all; could potentially work better if we had some context info
* DOES work with localization
*
* it's mainly intended for the simple case of reversing a question with compile-time-static fields, for use inside an <output>
*/
if (!ec.getFunctionHandlers().containsKey("jr:choice-name")) {
final FormDef f = this;
ec.addFunctionHandler(
new IFunctionHandler() {
public String getName() {
return "jr:choice-name";
}
public Object eval(Object[] args) {
try {
String value = (String) args[0];
String questionXpath = (String) args[1];
TreeReference ref = RestoreUtils.xfFact.ref(questionXpath);
QuestionDef q = f.findQuestionByRef(ref, f);
if (q == null
|| (q.getControlType() != Constants.CONTROL_SELECT_ONE
&& q.getControlType() != Constants.CONTROL_SELECT_MULTI)) {
return "";
}
Vector<SelectChoice> choices = q.getChoices();
for (SelectChoice ch : choices) {
if (ch.getValue().equals(value)) {
// this is really not ideal. we should hook into the existing code
// (FormEntryPrompt) for pulling
// display text for select choices. however, it's hard, because we don't really
// have
// any context to work with, and all the situations where that context would be
// used
// don't make sense for trying to reverse a select value back to a label in an
// unrelated
// expression
String textID = ch.getTextID();
if (textID != null) {
return f.getLocalizer().getText(textID);
} else {
return ch.getLabelInnerText();
}
}
}
return "";
} catch (Exception e) {
throw new WrappedException(
"error in evaluation of xpath function [choice-name]", e);
}
}
public Vector getPrototypes() {
Class[] proto = {String.class, String.class};
Vector v = new Vector();
v.addElement(proto);
return v;
}
public boolean rawArgs() {
return false;
}
public boolean realTime() {
return false;
}
});
}
}
