OCLOperators value
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{{Edited|July|12|2024}}The value of the current nullable object is returned if it has been assigned a valid underlying value otherwise 0 is returned. | {{Edited|July|12|2024}}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 MDriven OCL expressions. | 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 | For example: | ||
[[File:getting-value-for-nullable-type.png|alt=getting value for nullable type|frameless]] | [[File:getting-value-for-nullable-type.png|alt=getting value for nullable type|frameless]] | ||
To calculate the Total Price of all products | To calculate the Total Price of all products use: | ||
Product.allinstances.Price->sum.Value | |||
or: | |||
Product.allinstances->collect(i|i.Price.Value)->sum | |||
or | 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. | ||
This will ensure a value is always returned by the expression either when there are no product instances or product price is not set for all instances | |||
Revision as of 04:56, 21 June 2024
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.
This page was edited 7 days ago on 06/24/2024. What links here