Error upon using a count in magic properties

[Tanya]

Hello,

I am currently trying to use a count in a magic properties, however I am getting errors. I was wondering if someone would be able to assist me.

Thank you kindly,
Tanya


Errors:
- SELECT with expressions not supported in magic properties
- Function definition does not contain a valid body

Magic Properties Function:
SELECT COUNT(DISTINCT ?e) COUNT(DISTINCT ?e2)
WHERE {
    ( ?d1 ) :getFnc ( ?e ) .
    ( ?d2 ) :getFnc ( ?e2 ) .}

Contraints: ?d1, ?d2


Error message: Failed to execute operation
Exception Stack Trace:
java.lang.reflect.InvocationTargetException
    at org.topbraid.core.change.AbstractChangeEngine.execute(AbstractChangeEngine.java:286)
    at org.topbraidcomposer.core.change.TBCChangeEngine.access$0(TBCChangeEngine.java:1)
    at org.topbraidcomposer.core.change.TBCChangeEngine$2.run(TBCChangeEngine.java:163)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Caused by: org.eclipse.core.commands.ExecutionException: While executing the operation, an exception occurred
    at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:521)
    at org.topbraid.core.change.AbstractChangeEngine.execute(AbstractChangeEngine.java:272)
    ... 3 more
Caused by: java.lang.IllegalStateException: we failed to create the object: java.lang.NullPointerException: Failed to identify source graph (statement found but not identified)
    at org.topbraidcomposer.change.lib.ReplaceObjectChange.execute(ReplaceObjectChange.java:53)
    at org.topbraid.core.change.ChangeOperation.execute(ChangeOperation.java:105)
    at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:513)
    ... 4 more
Caused by: java.lang.NullPointerException: Failed to identify source graph (statement found but not identified)
    at org.topbraidcomposer.change.lib.AbstractReplaceObjectChange.replaceObject(AbstractReplaceObjectChange.java:116)
    at org.topbraidcomposer.change.lib.AbstractReplaceObjectChange.replaceObject(AbstractReplaceObjectChange.java:100)
    at org.topbraidcomposer.change.lib.ReplaceObjectChange.execute(ReplaceObjectChange.java:49)
    ... 6 more

Session data:
eclipse.buildId=I20110613-1736
java.version=1.6.0_45
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_CA
Framework arguments:  -product org.eclipse.epp.package.rcp.product
Command-line arguments:  -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.rcp.product

[Holger Knublauch]

Hi Tanya,

the message means what it states: it is not possible to define a magic property that has an expression (such as COUNT) as result variable. Given that it only returns one value, why don't you just implement it as a normal spin:Function?

The exception below that seems unrelated, and I would need more information on why this happened.

HTH
Holger

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[Tanya Hiebert]

Thank you for your assistance. I have implemented it as normal, and it works now.

Tanya

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