Documentation:OCLOperators value: Difference between revisions

OCLOperators value

Latest revision as of 05:59, 20 January 2025

This page was created by Lars.olofsson@mdriven.net on 2024-06-11. Last edited by Edgar on 2025-01-20.

Returns the the non-null value of a simple nullable type.

Expression	Result
int? with the value null	0

The value of the current nullable object is returned if it has been assigned a valid underlying value - otherwise, 0 is returned.

Some expressions may require a non-null value and yet your attribute is a nullable type. A scenario like this is catered for in the MDriven OCL expressions.

.Value is available for all number types including Integer, Decimal, Double, and Int64.

For example:

To calculate the Total Price of all products use:

Product.allinstances.Price->sum.Value

or:

Product.allinstances->collect(i|i.Price.Value)->sum

This will ensure a value is always returned by the expression, either when there are no product instances or the product price is not set for all instances.

@@ Line 1: / Line 1: @@
-{{message|Write the content here to display this box}}
+<message>Write the content here to display this box</message>
 Returns the the non-null value of a simple nullable type.
 {| class="wikitable"
@@ Line 8: / Line 8: @@
 |0
 |}
-{{Edited|July|12|2024}}
+{{Edited|July|12|2025}}The value of the current nullable object is returned if it has been assigned a valid underlying value - otherwise, 0 is returned.
+Some expressions may require  a non-null value and yet your attribute is a nullable type. A scenario like this is catered for in the MDriven OCL expressions.
+ '''.Value''' is available for all number types including Integer, Decimal, Double, and Int64.
+For example:
+[[File:getting-value-for-nullable-type.png|alt=getting value for nullable type|frameless|202x202px]]
+To calculate the Total Price of all products use:
+ Product.allinstances.Price->sum.Value
+or:
+ Product.allinstances->collect(i|i.Price.Value)->sum
+This will ensure a value is always returned by the expression, either when there are no product instances or the product price is not set for all instances.
+[[Category:OCLOperators]]