protected Constraint rewriteConstraint(Constraint constraint) {
if (constraint instanceof Comparison) {
Comparison comparison = (Comparison) constraint;
DynamicOperand left = comparison.getOperand1();
if (left instanceof PropertyValue) {
PropertyValue propValue = (PropertyValue) left;
if ("jcr:path".equals(propValue.getPropertyName())) {
// Rewrite this constraint as a PATH criteria ...
NodePath path = new NodePath(propValue.selectorName());
return new Comparison(path, comparison.operator(), comparison.getOperand2());
}
if ("jcr:score".equals(propValue.getPropertyName())) {
// Rewrite this constraint as a SCORE criteria ...
FullTextSearchScore score = new FullTextSearchScore(propValue.selectorName());
return new Comparison(score, comparison.operator(), comparison.getOperand2());
}
}
} else if (constraint instanceof FullTextSearch) {
FullTextSearch search = (FullTextSearch) constraint;
if (".".equals(search.getPropertyName())) {
// JCR-SQL's use of CONTAINS allows a '.' to be used to represent the search is to be
// performed on all properties of the node(s). However, JCR-SQL2 and our AQM
// expect a '*' to be used instead ...
return new FullTextSearch(search.selectorName(), search.fullTextSearchExpression());
}
} else if (constraint instanceof And) {
And and = (And) constraint;
constraint = new And(rewriteConstraint(and.left()), rewriteConstraint(and.right()));
} else if (constraint instanceof Or) {
Or or = (Or) constraint;
constraint = new Or(rewriteConstraint(or.left()), rewriteConstraint(or.right()));
}
return constraint;
}
/**
* Create the constraint evaluator that is used by the {@link SelectComponent} to evaluate the
* supplied {@link Constraint criteria}.
*
* @param types the type system; may not be null
* @param schemata the schemata; may not be null
* @param columns the definition of the result columns and the tuples; may not be null
* @param constraint the criteria that this {@link SelectComponent} is to evaluate
* @param variables the variables that are to be substituted for the various {@link
* BindVariableName} {@link StaticOperand operands}; may not be null
* @return the constraint evaluator; never null
*/
protected ConstraintChecker createChecker(
final TypeSystem types,
Schemata schemata,
Columns columns,
Constraint constraint,
Map<String, Object> variables) {
if (constraint instanceof Or) {
Or orConstraint = (Or) constraint;
final ConstraintChecker left =
createChecker(types, schemata, columns, orConstraint.left(), variables);
final ConstraintChecker right =
createChecker(types, schemata, columns, orConstraint.right(), variables);
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return left.satisfiesConstraints(tuple) || right.satisfiesConstraints(tuple);
}
};
}
if (constraint instanceof Not) {
Not notConstraint = (Not) constraint;
final ConstraintChecker original =
createChecker(types, schemata, columns, notConstraint.getConstraint(), variables);
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return !original.satisfiesConstraints(tuple);
}
};
}
if (constraint instanceof And) {
And andConstraint = (And) constraint;
final ConstraintChecker left =
createChecker(types, schemata, columns, andConstraint.left(), variables);
final ConstraintChecker right =
createChecker(types, schemata, columns, andConstraint.right(), variables);
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return left.satisfiesConstraints(tuple) && right.satisfiesConstraints(tuple);
}
};
}
if (constraint instanceof ChildNode) {
ChildNode childConstraint = (ChildNode) constraint;
final int locationIndex = columns.getLocationIndex(childConstraint.selectorName().name());
final Path parentPath = (Path) types.getPathFactory().create(childConstraint.getParentPath());
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
Location location = (Location) tuple[locationIndex];
return location.getPath().getParent().equals(parentPath);
}
};
}
if (constraint instanceof DescendantNode) {
DescendantNode descendantNode = (DescendantNode) constraint;
final int locationIndex = columns.getLocationIndex(descendantNode.selectorName().name());
final Path ancestorPath =
(Path) types.getPathFactory().create(descendantNode.getAncestorPath());
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
Location location = (Location) tuple[locationIndex];
return location.getPath().isDescendantOf(ancestorPath);
}
};
}
if (constraint instanceof SameNode) {
SameNode sameNode = (SameNode) constraint;
final int locationIndex = columns.getLocationIndex(sameNode.selectorName().name());
final String path = sameNode.getPath();
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
Location location = (Location) tuple[locationIndex];
return location.toString().equals(path);
}
};
}
if (constraint instanceof PropertyExistence) {
PropertyExistence propertyExistance = (PropertyExistence) constraint;
String selectorName = propertyExistance.selectorName().name();
final String propertyName = propertyExistance.getPropertyName();
final int columnIndex = columns.getColumnIndexForProperty(selectorName, propertyName);
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return tuple[columnIndex] != null;
}
};
}
if (constraint instanceof FullTextSearch) {
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return true;
}
};
}
if (constraint instanceof Relike) {
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return true;
}
};
}
if (constraint instanceof Comparison) {
Comparison comparison = (Comparison) constraint;
// Create the correct dynamic operation ...
DynamicOperation dynamicOperation =
createDynamicOperation(types, schemata, columns, comparison.getOperand1());
Operator operator = comparison.operator();
StaticOperand staticOperand = comparison.getOperand2();
return createChecker(types, schemata, columns, dynamicOperation, operator, staticOperand);
}
if (constraint instanceof SetCriteria) {
SetCriteria setCriteria = (SetCriteria) constraint;
DynamicOperation dynamicOperation =
createDynamicOperation(types, schemata, columns, setCriteria.leftOperand());
Operator operator = Operator.EQUAL_TO;
final List<ConstraintChecker> checkers = new LinkedList<ConstraintChecker>();
for (StaticOperand setValue : setCriteria.rightOperands()) {
ConstraintChecker rightChecker =
createChecker(types, schemata, columns, dynamicOperation, operator, setValue);
assert rightChecker != null;
checkers.add(rightChecker);
}
if (checkers.isEmpty()) {
// Nothing will satisfy these constraints ...
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
return false;
}
};
}
return new ConstraintChecker() {
@Override
public boolean satisfiesConstraints(Object[] tuple) {
for (ConstraintChecker checker : checkers) {
if (checker.satisfiesConstraints(tuple)) return true;
}
return false;
}
};
}
assert false;
return null;
}
