@Override
public void start() {
assert predicateResult != Boolean.FALSE;
assert !finished;
if (event.hasInstantListener(expression)) {
if (listener instanceof LocationEvaluation)
predicateChain = ((LocationEvaluation) listener).predicateChain;
else predicateChain = 0;
if (predicateEvaluation != null) predicateChain++;
}
if (predicateEvaluation != null) {
Expression predicate = predicateEvaluation.expression;
if (predicate.scope() != Scope.DOCUMENT) predicateEvaluation.start();
}
eventID.addListener(event, currentStep, this);
}
public PathExpression(LocationPath union, Expression relativeExpression, boolean forEach) {
super(Scope.DOCUMENT, relativeExpression.resultType);
assert relativeExpression.scope() != Scope.DOCUMENT;
this.union = union;
contexts = new Expression[union.contexts.size()];
for (int i = 0; i < contexts.length; i++)
contexts[i] = union.contexts.get(i).typeCast(DataType.NODESET);
this.relativeExpression = relativeExpression;
if (relativeExpression instanceof LocationExpression)
((LocationExpression) relativeExpression).rawResult = true;
else ((Literal) relativeExpression).rawResultRequired();
this.forEach = forEach;
if (union.hitExpression != null) union.hitExpression.pathExpression = this;
}
private void resultPrepared() {
if (!resultPrepared) {
manuallyExpired = true;
resultPrepared = true;
for (LinkableEvaluation pendingEval = pendingEvaluationHead;
pendingEval != null;
pendingEval = pendingEval.next) pendingEval.removeListener(this);
pendingEvaluationHead = pendingEvaluationTail = null;
}
if (predicateResult != null
&& (index != 0 || (stringEvaluations == null || stringEvaluations.size() == 0))) finished();
else if (result.size() == 0
&& predicateResult
== null) { // when result is empty, there is no need to wait for predicateEvaluation to
// finish
Expression predicate = predicateEvaluation.expression;
if (predicate.scope() != Scope.DOCUMENT) predicateEvaluation.removeListener(this);
else event.removeListener(predicate, this);
finished();
}
}