Hiding import keyword when no packages are visible.

plugins/org.yakindu.sct.model.stext.ui/src/org/yakindu/sct/model/stext/ui/contentassist/STextProposalProvider.java

@@ -15,18 +15,27 @@ import java.util.ArrayList;
 import java.util.List;
 
 import org.eclipse.emf.common.util.EList;
+import org.eclipse.emf.common.util.URI;
 import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.resource.Resource;
+import org.eclipse.emf.ecore.util.EcoreUtil;
 import org.eclipse.jface.text.contentassist.ICompletionProposal;
 import org.eclipse.xtext.EnumLiteralDeclaration;
 import org.eclipse.xtext.Keyword;
 import org.eclipse.xtext.RuleCall;
 import org.eclipse.xtext.XtextFactory;
+import org.eclipse.xtext.resource.IContainer;
+import org.eclipse.xtext.resource.IEObjectDescription;
+import org.eclipse.xtext.resource.IResourceDescription;
+import org.eclipse.xtext.resource.IResourceDescriptions;
+import org.eclipse.xtext.resource.impl.ResourceDescriptionsProvider;
 import org.eclipse.xtext.ui.editor.contentassist.ConfigurableCompletionProposal;
 import org.eclipse.xtext.ui.editor.contentassist.ContentAssistContext;
 import org.eclipse.xtext.ui.editor.contentassist.ICompletionProposalAcceptor;
 import org.yakindu.base.expressions.expressions.ElementReferenceExpression;
 import org.yakindu.base.expressions.expressions.FeatureCall;
 import org.yakindu.base.types.Operation;
+import org.yakindu.base.types.TypesPackage;
 import org.yakindu.sct.model.stext.services.STextGrammarAccess;
 import org.yakindu.sct.model.stext.stext.InterfaceScope;
 import org.yakindu.sct.model.stext.stext.InternalScope;
@@ -35,8 +44,11 @@ import org.yakindu.sct.model.stext.stext.StatechartSpecification;
 import org.yakindu.sct.model.stext.stext.TransitionSpecification;
 import org.yakindu.sct.model.stext.stext.VariableDefinition;
 
+import com.google.common.collect.Iterables;
 import com.google.inject.Inject;
 
+import de.itemis.xtext.utils.jface.viewers.ContextElementAdapter;
+
 /**
  * Several filters to make proposals more useful.
  * 
@@ -46,6 +58,10 @@ public class STextProposalProvider extends AbstractSTextProposalProvider {
 
 	@Inject
 	private STextGrammarAccess grammarAccess;
+	@Inject
+	private IContainer.Manager containerManager;
+	@Inject
+	private ResourceDescriptionsProvider resourceDescriptionsProvider;
 
 	/**
 	 * Validates if a keyword should be viewed by the proposal view.
@@ -77,6 +93,10 @@ public class STextProposalProvider extends AbstractSTextProposalProvider {
 		else if (contentAssistContext.getRootModel() instanceof StatechartSpecification) {
 			suppressKeywords.addAll(getKeywords(grammarAccess.getExitEventAccess().getGroup().eContents()));
 			suppressKeywords.addAll(getKeywords(grammarAccess.getEntryEventAccess().getGroup().eContents()));
+			
+			if (!atLeastOnePackageExistsInIndex(getSctResource(contentAssistContext.getRootModel()))) {
+				suppressKeywords.addAll(getKeywords(grammarAccess.getImportScopeAccess().getGroup().eContents()));
+			}
 		}
 
 		EObject currentModel = contentAssistContext.getCurrentModel();
@@ -240,5 +260,32 @@ public class STextProposalProvider extends AbstractSTextProposalProvider {
 			return delegate.canAcceptMoreProposals();
 		}
 	}
+	
+	private boolean atLeastOnePackageExistsInIndex(Resource res) {
+		IResourceDescriptions resourceDescriptions = resourceDescriptionsProvider.getResourceDescriptions(res);
+		URI uri = res.getURI();
+		IResourceDescription resourceDescription = resourceDescriptions.getResourceDescription(uri);
+		for (IContainer container : containerManager.getVisibleContainers(resourceDescription, resourceDescriptions)) {
+			final Iterable<IResourceDescription> currentDescriptions = container.getResourceDescriptions();
+			for (IResourceDescription resDesc : currentDescriptions) {
+				Iterable<IEObjectDescription> visisblePackages = resDesc
+						.getExportedObjectsByType(TypesPackage.Literals.PACKAGE);
+				if (!Iterables.isEmpty(visisblePackages)) {
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+	
+	private Resource getSctResource(EObject context) {
+		final ContextElementAdapter provider = (ContextElementAdapter) EcoreUtil.getExistingAdapter(
+				context.eResource(), ContextElementAdapter.class);
+		if (provider == null) {
+			return context.eResource();
+		} else {
+			return provider.getElement().eResource();
+		}
+	}
 
 }