| [SOLVED] How to access to "com.google.inject.Injector.Injector" from JavaValidator [message #639234] |
Mon, 15 November 2010 17:16  |
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Hello
I presented the following problem when running the workflow XXXGenerator.mwe2, I access the "injector" (com.google.inject.Injector) from GUIDSLJavaValidator class to instantiate a concrete class (using the binding), but in all cases returns me null.
On the other side tried to use the method createInjectorAndDoEMFRegistration (), but when you register, all modules are reloaded, so runs recursively until throws StackOverflowException (enter in infinite loop).
Thanks.
public class GUIDSLJavaValidator extends AbstractGUIDSLJavaValidator {
@Inject
private Injector injector = null;
@Inject
private ISentence _sentence;
public GUIDSLJavaValidator() {
injector = super.getInjector(); // return null
injector = new GUIDSLStandaloneSetupGenerated()
.createInjectorAndDoEMFRegistration(); //enter in infinite loop
_sentence = injector.getInstance(ISentence.class); // never execute
public class GUIDSLRuntimeModule extends
unlp.info.guidsl.AbstractGUIDSLRuntimeModule {
@Override
public void configure(Binder binder) {
super.configure(binder);
binder.bind(ISentence.class).to(CSharpSentence.class);
[Updated on: Wed, 17 November 2010 15:33] Report message to a moderator |
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| Re: How to access to "com.google.inject.Injector.Injector" from JavaValidator [message #639372 is a reply to message #639234] |
Tue, 16 November 2010 10:06  |
 Jan Koehnlein
Messages: 760
Registered: July 2009
Location: Hamburg |
Senior Member |
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In general, you should never try to access the Injector directly. The
Java validator is usually created by Guice already, so all you have to
do to get other language specific things it to have them injected, e.g.
public class GUIDSLJavaValidator extends AbstractGUIDSLJavaValidator {
@Inject
private ISentence _sentence;
...
If _sentence stays null, this either means you haven't bound any
implementation to the interface ISentence or the GUIDSLJavaValidator has
not been created by Guice but by an explicit constructor call.
Am 15.11.10 18:16, schrieb Ariel Santana:
> Hello
> I presented the following problem when running the workflow
> XXXGenerator.mwe2, I access the "injector" (com.google.inject.Injector)
> from GUIDSLJavaValidator class to instantiate a concrete class (using
> the binding), but in all cases returns me null.
>
> On the other side tried to use the method
> createInjectorAndDoEMFRegistration (), but when you register, all
> modules are reloaded, so runs recursively until throws
> StackOverflowException (enter in infinite loop).
>
> Thanks.
>
>
> public class GUIDSLJavaValidator extends AbstractGUIDSLJavaValidator {
> @Inject
> private Injector injector = null;
> @Inject
> private ISentence _sentence;
>
> public GUIDSLJavaValidator() {
> injector = super.getInjector(); // return null
>
> injector = new GUIDSLStandaloneSetupGenerated()
> .createInjectorAndDoEMFRegistration(); //enter in infinite loop
>
> _sentence = injector.getInstance(ISentence.class); // never execute
>
>
>
> public class GUIDSLRuntimeModule extends
> unlp.info.guidsl.AbstractGUIDSLRuntimeModule {
>
> @Override
> public void configure(Binder binder) {
>
> super.configure(binder);
> binder.bind(ISentence.class).to(CSharpSentence.class);
>
--
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---
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| Re: How to access to "com.google.inject.Injector.Injector" from JavaValidator [message #639424 is a reply to message #639372] |
Tue, 16 November 2010 13:58 |
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| Jan Koehnlein wrote on Tue, 16 November 2010 08:06 |
...
public class GUIDSLJavaValidator extends AbstractGUIDSLJavaValidator {
@Inject
private ISentence _sentence;
...
If _sentence stays null, this either means you haven't bound any
implementation to the interface ISentence or the GUIDSLJavaValidator has
not been created by Guice but by an explicit constructor call.
|
Hi Jan, thanks for responding.
I mention that I followed your example, but the variable _sentence is not initialized automatically (has the value null).
Alternatives as you give, my case is probably the second option (you GUIDSLJavaValidator
Not been created by Guice But by an explicit constructor call).
In this case, as I can do about it?
As, for example, if I using JAVA calls from templates, the method Guice.createInjector works perfectly:
Test.xpt
«DEFINE expAction FOR Action»
Expand action: «expandAction(this)» // call extension
Extension.ext
import unlp::info::guidsl::gUIDSL;
String expandAction(Action action) :
JAVA unlp.info.guidsl.core.sentence.Sentence.toString( unlp.info.guidsl.gUIDSL.Action); // call java method in Sentence class
Sentence.java
public class Sentence {
@Inject
private ISentence _sentence;
public Sentence() {
Injector injector = Guice.createInjector(new GUIDSLRuntimeModule()); // works fine
_sentence = injector.getInstance(ISentence.class); // works fine
}
public String toString(Action action) {
return _sentence.toString(action); //work fine
}
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| Re: How to access to "com.google.inject.Injector.Injector" from JavaValidator [message #639550 is a reply to message #639424] |
Tue, 16 November 2010 20:58 |
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Hi,
following works fine for me:
package org.xtext.example.mydsl.validation;
public interface IHelper {
public boolean help();
}
package org.xtext.example.mydsl.validation;
public class Helper implements IHelper {
@Override
public boolean help() {
return true;
}
}
package org.xtext.example.mydsl.validation;
import org.eclipse.xtext.validation.Check;
import org.xtext.example.mydsl.myDsl.Greeting;
import org.xtext.example.mydsl.myDsl.MyDslPackage;
import com.google.inject.Inject;
public class MyDslJavaValidator extends AbstractMyDslJavaValidator {
@Inject
private IHelper helper;
@Check
public void checkGreetingStartsWithCapital(Greeting greeting) {
if (helper.help()) {
error("Helper returned true", MyDslPackage.GREETING__NAME);
}
}
}
package org.xtext.example.mydsl;
import org.xtext.example.mydsl.validation.Helper;
import org.xtext.example.mydsl.validation.IHelper;
import com.google.inject.Binder;
/**
* Use this class to register components to be used at runtime / without the Equinox extension registry.
*/
public class MyDslRuntimeModule extends org.xtext.example.mydsl.AbstractMyDslRuntimeModule {
@Override
public void configure(Binder binder) {
super.configure(binder);
binder.bind(IHelper.class).to(Helper.class);
}
}
~Christian
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
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