ScopeProvider in Java

for easier debugging

edelta.parent/edelta/src/edelta/GenerateEdelta.mwe2

@@ -44,6 +44,9 @@ Workflow {
 				generateStub = true
 				generateXtendStub = true
 			}
+			scopeProvider = {
+				generateXtendStub = false
+			}
 			projectWizard = {
 				generate = true
 			}

edelta.parent/edelta/src/edelta/scoping/EdeltaScopeProvider.java

@@ -0,0 +1,56 @@
+/*
+ * generated by Xtext 2.21.0
+ */
+package edelta.scoping;
+
+import static edelta.edelta.EdeltaPackage.Literals.*;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.xtext.scoping.IScope;
+import org.eclipse.xtext.scoping.Scopes;
+import org.eclipse.xtext.scoping.impl.FilteringScope;
+import org.eclipse.xtext.util.IResourceScopeCache;
+
+import com.google.inject.Inject;
+
+import edelta.edelta.EdeltaEcoreQualifiedReference;
+import edelta.util.EdeltaEcoreHelper;
+import edelta.util.EdeltaModelUtil;
+
+/**
+ * This class contains custom scoping description.
+ * 
+ * See
+ * https://www.eclipse.org/Xtext/documentation/303_runtime_concepts.html#scoping
+ * on how and when to use it.
+ */
+public class EdeltaScopeProvider extends AbstractEdeltaScopeProvider {
+	@Inject
+	private IResourceScopeCache cache;
+
+	@Inject
+	private EdeltaModelUtil edeltaModelUtil;
+
+	@Inject
+	private EdeltaEcoreHelper edeltaEcoreHelper;
+
+	@Override
+	public IScope getScope(final EObject context, final EReference reference) {
+		if (reference == EDELTA_ECORE_REFERENCE__ENAMEDELEMENT) {
+			if (context instanceof EdeltaEcoreQualifiedReference) {
+				return Scopes.scopeFor(edeltaEcoreHelper.getENamedElements(
+					((EdeltaEcoreQualifiedReference) context).getQualification().getEnamedelement(),
+						context));
+			}
+			return Scopes.scopeFor(edeltaEcoreHelper.getProgramENamedElements(context));
+		} else if (reference == EDELTA_MODIFY_ECORE_OPERATION__EPACKAGE) {
+			return Scopes.scopeFor(edeltaModelUtil.getProgram(context).getMetamodels());
+		} else if (reference == EDELTA_PROGRAM__METAMODELS) {
+			return cache.get("scopeMetamodels", context.eResource(),
+				() -> new FilteringScope(delegateGetScope(context, reference),
+						it -> "false".equals(it.getUserData("nsURI"))));
+		}
+		return super.getScope(context, reference);
+	}
+}