fix(web): not dot display spurious occurrences

Only return find occurrences results for NamedElement instances,
as other objects cannot be referenced by name and thus cannot have any
references at all.

2 files changed, 22 insertions, 0 deletions

diff --git a/language-web/src/main/java/tools/refinery/language/web/ProblemWebModule.java b/language-web/src/main/java/tools/refinery/language/web/ProblemWebModule.java
index ac8934ed..ec55036f 100644
--- a/language-web/src/main/java/tools/refinery/language/web/ProblemWebModule.java
+++ b/language-web/src/main/java/tools/refinery/language/web/ProblemWebModule.java
@@ -6,7 +6,9 @@ package tools.refinery.language.web;
 import org.eclipse.xtext.web.server.XtextServiceDispatcher;
 import org.eclipse.xtext.web.server.model.IWebDocumentProvider;
 import org.eclipse.xtext.web.server.model.XtextWebDocumentAccess;
+import org.eclipse.xtext.web.server.occurrences.OccurrencesService;
 
+import tools.refinery.language.web.occurrences.ProblemOccurrencesService;
 import tools.refinery.language.web.xtext.server.push.PushServiceDispatcher;
 import tools.refinery.language.web.xtext.server.push.PushWebDocumentAccess;
 import tools.refinery.language.web.xtext.server.push.PushWebDocumentProvider;
@@ -26,4 +28,8 @@ public class ProblemWebModule extends AbstractProblemWebModule {
         public Class<? extends XtextServiceDispatcher> bindXtextServiceDispatcher() {
                 return PushServiceDispatcher.class;
         }
+        
+        public Class<? extends OccurrencesService> bindOccurrencesService() {
+                return ProblemOccurrencesService.class;
+        }
 }
diff --git a/language-web/src/main/java/tools/refinery/language/web/occurrences/ProblemOccurrencesService.java b/language-web/src/main/java/tools/refinery/language/web/occurrences/ProblemOccurrencesService.java
new file mode 100644
index 00000000..d32bbb54
--- /dev/null
+++ b/language-web/src/main/java/tools/refinery/language/web/occurrences/ProblemOccurrencesService.java
@@ -0,0 +1,16 @@
+package tools.refinery.language.web.occurrences;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.xtext.web.server.occurrences.OccurrencesService;
+
+import com.google.inject.Singleton;
+
+import tools.refinery.language.model.problem.NamedElement;
+
+@Singleton
+public class ProblemOccurrencesService extends OccurrencesService {
+        @Override
+        protected boolean filter(EObject element) {
+                return super.filter(element) && element instanceof NamedElement;
+        }
+}