Notice: this Wiki will be going read only early in 2024 and edits will no longer be possible. Please see: https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/wikis/Wiki-shutdown-plan for the plan.
Difference between revisions of "QVTo/FAQ"
(→Q: I've properly defined a Java black box unit and the editor recognize my blackbox operations, however my transformation crashes when executing those operations. What I'm doing wrong?) |
(→Q: I've properly defined a Java black box unit and the editor recognize my blackbox operations, however my transformation crashes when executing those operations. What I'm doing wrong?) |
||
| Line 29: | Line 29: | ||
=Q: I've properly defined a Java black box unit and the editor recognize my blackbox operations, however my transformation crashes when executing those operations. What I'm doing wrong?= | =Q: I've properly defined a Java black box unit and the editor recognize my blackbox operations, however my transformation crashes when executing those operations. What I'm doing wrong?= | ||
| − | '''A:''' May be you have forgotten to define in the extension of the Java Black-Box Units extension point all the metamodels which are involved in operations of your java black box unit. So for example, for the following java black box operation: | + | '''A:''' May be you have forgotten to define in the extension of the Java Black-Box Units extension point all the metamodels which are involved in operations of your java black box unit. |
| + | |||
| + | So for example, for the following java black box operation: | ||
@Operation(contextual=true) | @Operation(contextual=true) | ||
| Line 38: | Line 40: | ||
} | } | ||
| − | Ensure that you have properly defined the URI of the metamodel of MyDSLType: | + | Ensure that you have properly defined the URI of the metamodel of ''MyDSLType'': |
<extension point="org.eclipse.m2m.qvt.oml.javaBlackboxUnits"> | <extension point="org.eclipse.m2m.qvt.oml.javaBlackboxUnits"> | ||
Revision as of 12:26, 14 March 2013
This QVTo Wiki entry gather some frequently asked questions thrown in the QVTo forum
A: Yes. The QVTo language provides import mechanisms so that your modules may import other Tranformations and Libraries defined in other files.
This is an easy example in which we create a MyLib.qvto library acceded by a MyTransformation.qvto.
1. MyLyb.qvto file:
library MyLib;
helper doSomethingCol() : String {
return "Well, this is trivial!!";
}
2. MyTransformation.qvto file:
import MyLib;
transformation MyTransformation();
main() {
log(doSomethingCool());
}
You may find more information about the different mechanisms of module imports in the Section 8.2.1.4 of the OMG QVT specification
Q: I've properly defined a Java black box unit and the editor recognize my blackbox operations, however my transformation crashes when executing those operations. What I'm doing wrong?
A: May be you have forgotten to define in the extension of the Java Black-Box Units extension point all the metamodels which are involved in operations of your java black box unit.
So for example, for the following java black box operation:
@Operation(contextual=true)
public static String doSomeComplexOperation(MyDSLType self) {
String result;
// Do some complex operation with self variable
return result;
}
Ensure that you have properly defined the URI of the metamodel of MyDSLType:
<extension point="org.eclipse.m2m.qvt.oml.javaBlackboxUnits">
<unit name="ExampleJavaLib" namespace="m2m.qvt.oml">
<library name="UtilLib" class="org.eclipse.m2m.qvt.oml.examples.blackbox.UtilitiesLibrary">
<metamodel nsURI="http://MyDSL1URI"/>
<metamodel nsURI="http://MyDSL2URI"/>
</library>
</unit>
</extension>
For more information about Java Black-Box units check the QVT Operational Developer Guide (Eclipse's Help) since there is "BlackBox support" section which covers this topic