@Override
public void endPredicate() {
predicateDepth--;
Object predicate = pop();
Predicated predicated = (Predicated) peek();
Expression predicateExpr;
if (predicate instanceof Expression) {
predicateExpr = (Expression) predicate;
if (predicateExpr.resultType == DataType.NUMBER) {
if (predicate instanceof Literal) {
Double d = (Double) predicateExpr.getResult();
int pos = d.intValue();
if (d != pos) predicateExpr = new Literal(Boolean.FALSE, DataType.BOOLEAN);
else {
Step step = predicated instanceof Step ? (Step) predicated : null;
if (step != null
&& (step.axis == Axis.SELF
|| ((step.axis == Axis.ATTRIBUTE || step.axis == Axis.NAMESPACE)
&& step.constraint instanceof QName)
|| step.predicateSet.getPredicate() instanceof ExactPosition))
predicateExpr = new Literal(pos == 1, DataType.BOOLEAN);
else predicateExpr = new ExactPosition(pos);
}
} else {
FunctionCall equals = new FunctionCall(Functions.NUMBER_EQUALS_NUMBER);
equals.addValidMember(new Position(), 0);
equals.addValidMember(predicateExpr, 1);
predicateExpr = equals;
}
} else predicateExpr = Functions.typeCast(predicateExpr, DataType.BOOLEAN);
} else predicateExpr = Functions.typeCast(predicate, DataType.BOOLEAN);
if (predicated instanceof LocationPath) {
LocationPath path = (LocationPath) predicated;
if (path.contexts.size() == 0) {
LocationPath newPath = new LocationPath(Scope.LOCAL, 0);
newPath.contexts.add(path);
pop();
push(newPath);
predicated = newPath;
}
}
predicated.addPredicate(predicateExpr);
}
@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);
}
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();
}
}
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;
}