private boolean usesDeclaration(final Constraint constraint) {
boolean usesDecl = false;
final Declaration[] declarations = constraint.getRequiredDeclarations();
for (int j = 0; !usesDecl && j < declarations.length; j++) {
usesDecl = (declarations[j].getPattern().getObjectType() == this.objectType);
}
return usesDecl;
}
private void createConstraints(
BuildContext context,
BuildUtils utils,
Pattern pattern,
List<Constraint> alphaConstraints,
List<Constraint> betaConstraints) {
final List<?> constraints = pattern.getConstraints();
// check if cross products for identity patterns should be disabled
checkRemoveIdentities(context, pattern, betaConstraints);
// checks if this pattern is nested inside a NOT CE
final boolean isNegative = isNegative(context);
for (final Iterator<?> it = constraints.iterator(); it.hasNext(); ) {
final Object object = it.next();
// Check if its a declaration
if (object instanceof Declaration) {
// nothing to be done
continue;
}
final Constraint constraint = (Constraint) object;
if (constraint.getType().equals(Constraint.ConstraintType.ALPHA)) {
alphaConstraints.add(constraint);
} else if (constraint.getType().equals(Constraint.ConstraintType.BETA)) {
betaConstraints.add(constraint);
if (isNegative
&& context.getRuleBase().getConfiguration().getEventProcessingMode()
== EventProcessingOption.STREAM
&& pattern.getObjectType().isEvent()
&& constraint.isTemporal()) {
checkDelaying(context, constraint);
}
} else {
throw new RuntimeDroolsException(
"Unknown constraint type: "
+ constraint.getType()
+ ". This is a bug. Please contact development team.");
}
}
}
private void checkDelaying(final BuildContext context, final Constraint constraint) {
if (constraint instanceof VariableConstraint) {
// variable constraints always require a single declaration
Declaration target = constraint.getRequiredDeclarations()[0];
if (target.isPatternDeclaration() && target.getPattern().getObjectType().isEvent()) {
long uplimit = ((VariableConstraint) constraint).getInterval().getUpperBound();
Timer timer = context.getRule().getTimer();
DurationTimer durationTimer = new DurationTimer(uplimit);
if (timer instanceof CompositeMaxDurationTimer) {
// already a composite so just add
((CompositeMaxDurationTimer) timer).addDurationTimer(durationTimer);
} else {
if (timer == null) {
// no timer exists, so ok on it's own
timer = durationTimer;
} else {
// timer exists so we need to make a composite
CompositeMaxDurationTimer temp = new CompositeMaxDurationTimer();
if (timer instanceof DurationTimer) {
// previous timer was a duration, so add another DurationTimer
temp.addDurationTimer((DurationTimer) timer);
} else {
// previous timer was not a duration, so set it as the delegate Timer.
temp.setTimer(context.getRule().getTimer());
}
// now add the new durationTimer
temp.addDurationTimer(durationTimer);
timer = temp;
}
// with the composite made, reset it on the Rule
context.getRule().setTimer(timer);
}
}
}
}
/**
* recurse through the rule condition elements updating the declaration objecs
*
* @param resolver
* @param contextStack
* @param element
*/
private void processElement(
final DeclarationScopeResolver resolver,
final Stack contextStack,
final RuleConditionElement element) {
if (element instanceof Pattern) {
Pattern pattern = (Pattern) element;
for (Iterator it = pattern.getNestedElements().iterator(); it.hasNext(); ) {
processElement(resolver, contextStack, (RuleConditionElement) it.next());
}
for (Constraint next : pattern.getConstraints()) {
if (next instanceof Declaration) {
continue;
}
Constraint constraint = (Constraint) next;
Declaration[] decl = constraint.getRequiredDeclarations();
for (int i = 0; i < decl.length; i++) {
Declaration resolved = resolver.getDeclaration(null, decl[i].getIdentifier());
if (constraint instanceof MvelConstraint
&& ((MvelConstraint) constraint).isUnification()) {
if (ClassObjectType.DroolsQuery_ObjectType.isAssignableFrom(
resolved.getPattern().getObjectType())) {
Declaration redeclaredDeclr =
new Declaration(
resolved.getIdentifier(),
((MvelConstraint) constraint).getFieldExtractor(),
pattern,
false);
pattern.addDeclaration(redeclaredDeclr);
} else {
((MvelConstraint) constraint).unsetUnification();
}
}
if (resolved != null && resolved != decl[i] && resolved.getPattern() != pattern) {
constraint.replaceDeclaration(decl[i], resolved);
} else if (resolved == null) {
// it is probably an implicit declaration, so find the corresponding pattern
Pattern old = decl[i].getPattern();
Pattern current = resolver.findPatternByIndex(old.getIndex());
if (current != null && old != current) {
resolved = new Declaration(decl[i].getIdentifier(), decl[i].getExtractor(), current);
constraint.replaceDeclaration(decl[i], resolved);
}
}
}
}
} else if (element instanceof EvalCondition) {
Declaration[] decl = ((EvalCondition) element).getRequiredDeclarations();
for (Declaration aDecl : decl) {
Declaration resolved = resolver.getDeclaration(null, aDecl.getIdentifier());
if (resolved != null && resolved != aDecl) {
((EvalCondition) element).replaceDeclaration(aDecl, resolved);
}
}
} else if (element instanceof Accumulate) {
for (RuleConditionElement rce : element.getNestedElements()) {
processElement(resolver, contextStack, rce);
}
((Accumulate) element).resetInnerDeclarationCache();
} else if (element instanceof From) {
DataProvider provider = ((From) element).getDataProvider();
Declaration[] decl = provider.getRequiredDeclarations();
for (Declaration aDecl : decl) {
Declaration resolved = resolver.getDeclaration(null, aDecl.getIdentifier());
if (resolved != null && resolved != aDecl) {
provider.replaceDeclaration(aDecl, resolved);
} else if (resolved == null) {
// it is probably an implicit declaration, so find the corresponding pattern
Pattern old = aDecl.getPattern();
Pattern current = resolver.findPatternByIndex(old.getIndex());
if (current != null && old != current) {
resolved = new Declaration(aDecl.getIdentifier(), aDecl.getExtractor(), current);
provider.replaceDeclaration(aDecl, resolved);
}
}
}
} else if (element instanceof QueryElement) {
QueryElement qe = (QueryElement) element;
Pattern pattern = qe.getResultPattern();
for (Entry<String, Declaration> entry : pattern.getInnerDeclarations().entrySet()) {
Declaration resolved = resolver.getDeclaration(null, entry.getValue().getIdentifier());
if (resolved != null && resolved != entry.getValue() && resolved.getPattern() != pattern) {
entry.setValue(resolved);
}
}
List<Integer> varIndexes = ArrayUtils.asList(qe.getVariableIndexes());
for (int i = 0; i < qe.getDeclIndexes().length; i++) {
Declaration declr = (Declaration) qe.getArgTemplate()[qe.getDeclIndexes()[i]];
Declaration resolved = resolver.getDeclaration(null, declr.getIdentifier());
if (resolved != null && resolved != declr && resolved.getPattern() != pattern) {
qe.getArgTemplate()[qe.getDeclIndexes()[i]] = resolved;
}
if (ClassObjectType.DroolsQuery_ObjectType.isAssignableFrom(
resolved.getPattern().getObjectType())) {
// if the resolved still points to DroolsQuery, we know this is the first unification
// pattern, so redeclare it as the visible Declaration
declr = pattern.addDeclaration(declr.getIdentifier());
// this bit is different, notice its the ArrayElementReader that we wire up to, not the
// declaration.
ArrayElementReader reader =
new ArrayElementReader(
new SelfReferenceClassFieldReader(Object[].class, "this"),
qe.getDeclIndexes()[i],
resolved.getExtractor().getExtractToClass());
declr.setReadAccessor(reader);
varIndexes.add(qe.getDeclIndexes()[i]);
}
}
qe.setVariableIndexes(ArrayUtils.toIntArray(varIndexes));
} else {
contextStack.push(element);
for (RuleConditionElement ruleConditionElement : element.getNestedElements()) {
processElement(resolver, contextStack, ruleConditionElement);
}
contextStack.pop();
}
}
