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Chapter 18 Rule Language Datatypes : Correcting Inconsistencies of Type

Correcting Inconsistencies of Type
TIBCO BusinessEvents attempts to correct inconsistencies of type whenever possible by converting expressions to the appropriate type. TIBCO BusinessEvents converts expression types in the following cases:
There are some inconsistencies of type that TIBCO BusinessEvents cannot correct. For example, all expressions within conditions must be of type boolean. If an expression within a condition evaluates to anything other than boolean, it would be illogical for TIBCO BusinessEvents to convert the expression to boolean. In cases like this, TIBCO BusinessEvents returns an error at compile time.
String Operands
When an expression uses the plus sign (+) with a string operand, TIBCO BusinessEvents treats the expression as a request for concatenation rather than addition. It converts the second operand to a string and concatenates the two strings.
For example:
"area code:  " + 650     becomes
"area code:  650"
Arithmetic Expressions
The following information applies to these operators:
*  /  %  +  -  <  <=  >  =  ==  !=
When an expression uses one of the above arithmetic operators with two numbers of different numeric types, TIBCO BusinessEvents promotes one of the two operands to the numeric type of the other. It makes these promotions as follows:
Assignment Conversion
If the value of an expression is assigned to a variable, TIBCO BusinessEvents converts the expression’s type to that of the variable. This might include, for example, converting a double to an int, or converting a generic model type to a more specific model type.
Function Argument Conversion
Conversions of function arguments are handled in the same way as assignment conversions.
 

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