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
On 1/14/2014 1:26, Tanya wrote:
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
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