/**
* Validates the expression.
*
* @param expressionContext
* @throws ExpressionEngineException
*/
protected void validate(ExpressionContext expressionContext) throws ExpressionEngineException {
HashMap typeMapping = (HashMap) typePairMapping.get(getClass());
if (typeMapping == null) {
throw new ExpressionEngineException(
"No type mapping specified for class \"" + getClass().getName() + "\"");
}
if (typeMapping.get(operandExpression.getReturnType()) == null) {
String prefix = StringUtils.getLastToken(getClass().getName(), ".");
prefix = prefix.substring(0, prefix.length() - "Expression".length());
throw new ExpressionEngineException(
"Operand of type: [\""
+ operandExpression.getReturnType()
+ "\"] is not supported by operator \""
+ prefix
+ "\"");
}
}
/** @see org.ganges.expressionengine.expressions.Expression#getReturnType() */
public Type getReturnType() throws ExpressionEngineException {
HashMap typeMapping = (HashMap) typePairMapping.get(getClass());
return (Type) typeMapping.get(operandExpression.getReturnType());
}
@Override
protected boolean isReturnTypesNotNull() {
if (right == null) return (left.getReturnType() != null);
return (left.getReturnType() != null) && (right.getReturnType() != null);
}
