public ExprNode validate(ExprValidationContext validationContext) throws ExprValidationException {
// Must have 2 child nodes
if (this.getChildNodes().length < 1) {
throw new IllegalStateException("Group relational op node must have 1 or more parameters");
}
evaluators = ExprNodeUtility.getEvaluators(this.getChildNodes());
Class typeOne = JavaClassHelper.getBoxedType(evaluators[0].getType());
// collections, array or map not supported
if ((typeOne.isArray())
|| (JavaClassHelper.isImplementsInterface(typeOne, Collection.class))
|| (JavaClassHelper.isImplementsInterface(typeOne, Map.class))) {
throw new ExprValidationException(
"Collection or array comparison is not allowed for the IN, ANY, SOME or ALL keywords");
}
List<Class> comparedTypes = new ArrayList<Class>();
comparedTypes.add(typeOne);
hasCollectionOrArray = false;
for (int i = 0; i < this.getChildNodes().length - 1; i++) {
Class propType = evaluators[i + 1].getType();
if (propType.isArray()) {
hasCollectionOrArray = true;
if (propType.getComponentType() != Object.class) {
comparedTypes.add(propType.getComponentType());
}
} else if (JavaClassHelper.isImplementsInterface(propType, Collection.class)) {
hasCollectionOrArray = true;
} else if (JavaClassHelper.isImplementsInterface(propType, Map.class)) {
hasCollectionOrArray = true;
} else {
comparedTypes.add(propType);
}
}
// Determine common denominator type
Class coercionType;
try {
coercionType =
JavaClassHelper.getCommonCoercionType(
comparedTypes.toArray(new Class[comparedTypes.size()]));
} catch (CoercionException ex) {
throw new ExprValidationException("Implicit conversion not allowed: " + ex.getMessage());
}
// Must be either numeric or string
if (coercionType != String.class) {
if (!JavaClassHelper.isNumeric(coercionType)) {
throw new ExprValidationException(
"Implicit conversion from datatype '"
+ coercionType.getSimpleName()
+ "' to numeric is not allowed");
}
}
computer = relationalOpEnum.getComputer(coercionType, coercionType, coercionType);
return null;
}
