/** @see org.vedantatree.expressionoasis.expressions.UnaryOperatorExpression#validate() */
@Override
protected void validate(ExpressionContext expressionContext) throws ExpressionEngineException {
// Initializes the function provider.
ParanthesisExpression argsExpression = (ParanthesisExpression) getOperandExpression();
List<Type> types = new ArrayList<Type>();
List values = new ArrayList();
populateTypesAndValues(argsExpression.getOperandExpression(), types, values);
Type[] parameterTypes = (Type[]) types.toArray(new Type[types.size()]);
for (Iterator functionProviders = expressionContext.getFunctionProviders().iterator();
functionProviders.hasNext(); ) {
FunctionProvider functionProvider = (FunctionProvider) functionProviders.next();
if (functionProvider.supportsFunction(functionName, parameterTypes)) {
this.functionProvider = functionProvider;
break;
}
}
if (functionProvider == null) {
throw new ExpressionEngineException(
"No Function Provider exists for function: ["
+ MethodKey.generateKey(functionName, parameterTypes)
+ "]");
}
}
/**
* @see
* org.vedantatree.expressionoasis.expressions.Expression#initialize(org.vedantatree.expressionoasis.ExpressionContext,
* java.lang.Object)
*/
@Override
public void initialize(ExpressionContext expressionContext, Object parameters, boolean validate)
throws ExpressionEngineException {
functionName = (String) expressionContext.getContextProperty("TOKEN");
super.initialize(expressionContext, parameters, validate);
}