[1077] Fix explorer in case of non-sysml domain

CHANGELOG.adoc

@@ -17,6 +17,8 @@
 
 === Bug fixes
 
+- https://github.com/eclipse-syson/syson/issues/1077[#1077] [explorer] Fix navigation in case of project containing both sysml and non-sysml model elements
+
 === Improvements
 
 - https://github.com/eclipse-syson/syson/issues/1061[#1061] [general-view] Add ellipsis on `Packages` label, to provide visual feedback on name overflow.

backend/views/syson-tree-explorer-view/pom.xml

@@ -132,6 +132,16 @@
 					</execution>
 				</executions>
 			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<configuration>
+				<!-- removes mockito warning: must align version of byte-buddy-agent with the version indirectly required by spring-boot-starter-test -->
+				<argLine>
+					-javaagent:"${settings.localRepository}/net/bytebuddy/byte-buddy-agent/1.15.11/byte-buddy-agent-1.15.11.jar"
+				</argLine>
+				</configuration>
+			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>

backend/views/syson-tree-explorer-view/src/main/java/org/eclipse/syson/tree/explorer/view/services/SysONDefaultExplorerServices.java

@@ -133,6 +133,8 @@ public boolean hasChildren(Object self, IEditingContext editingContext, List<Str
             List<Object> contents = this.filterService.applyFilters(this.contentService.getContents(self), activeFilterIds);
             hasChildren = !contents.isEmpty() && contents.stream().anyMatch(e -> !(e instanceof EAnnotation))
                 || this.hasRepresentation(element, editingContext);
+        } else {
+            hasChildren = explorerServices.hasChildren(self, editingContext);
         }
         return hasChildren;
     }

backend/views/syson-tree-explorer-view/src/test/java/org/eclipse/syson/tree/explorer/view/services/SysONDefaultExplorerServicesTest.java

@@ -0,0 +1,108 @@
+/*******************************************************************************
+ * Copyright (c) 2024, 2025 Obeo.
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.syson.tree.explorer.view.services;
+
+import org.eclipse.emf.common.command.BasicCommandStack;
+import org.eclipse.emf.ecore.*;
+import org.eclipse.emf.ecore.impl.EPackageRegistryImpl;
+import org.eclipse.emf.ecore.resource.ResourceSet;
+import org.eclipse.emf.ecore.util.ECrossReferenceAdapter;
+import org.eclipse.emf.ecore.util.EcoreAdapterFactory;
+import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
+import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
+import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
+import org.eclipse.sirius.components.collaborative.api.IRepresentationImageProvider;
+import org.eclipse.sirius.components.core.api.IContentService;
+import org.eclipse.sirius.components.core.api.IIdentityService;
+import org.eclipse.sirius.components.core.api.IObjectService;
+import org.eclipse.sirius.components.core.api.IURLParser;
+import org.eclipse.sirius.web.application.editingcontext.EditingContext;
+import org.eclipse.sirius.web.application.views.explorer.services.ExplorerServices;
+import org.eclipse.sirius.web.application.views.explorer.services.api.IExplorerServices;
+import org.eclipse.sirius.web.domain.boundedcontexts.representationdata.services.api.IRepresentationMetadataSearchService;
+import org.eclipse.syson.tree.explorer.view.services.api.ISysONExplorerFilterService;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+public class SysONDefaultExplorerServicesTest {
+
+    private static EditingContext editingContext;
+
+    private SysONDefaultExplorerServices sysONDefaultExplorerServices;
+
+    @BeforeAll
+    static void createEditingContext() {
+        ComposedAdapterFactory composedAdapterFactory = new ComposedAdapterFactory();
+        composedAdapterFactory.addAdapterFactory(new EcoreAdapterFactory());
+        composedAdapterFactory.addAdapterFactory(new ReflectiveItemProviderAdapterFactory());
+
+        EPackage.Registry ePackageRegistry = new EPackageRegistryImpl();
+        ePackageRegistry.put(EcorePackage.eINSTANCE.getNsURI(), EcorePackage.eINSTANCE);
+
+        AdapterFactoryEditingDomain editingDomain = new AdapterFactoryEditingDomain(composedAdapterFactory, new BasicCommandStack());
+        ResourceSet resourceSet = editingDomain.getResourceSet();
+        resourceSet.setPackageRegistry(ePackageRegistry);
+        resourceSet.eAdapters().add(new ECrossReferenceAdapter());
+        editingContext = new EditingContext(UUID.randomUUID().toString(), editingDomain, Map.of(), List.of());
+    }
+
+    @Test
+    @DisplayName("hasChildren method can handle non sysml content")
+    public void hasChildrenCanHandleNonSysmlContent() {
+        this.createMockServicesForHasChildren();
+
+        EPackage ePackage = EcoreFactory.eINSTANCE.createEPackage();
+        ePackage.setName("somePackage");
+        EClass c1 = EcoreFactory.eINSTANCE.createEClass();
+        ePackage.getEClassifiers().add(c1);
+        EClass c2 = EcoreFactory.eINSTANCE.createEClass();
+        ePackage.getEClassifiers().add(c2);
+        EAttribute c1_a1 = EcoreFactory.eINSTANCE.createEAttribute();
+        c1.getEStructuralFeatures().add(c1_a1);
+        EAttribute c1_a2 = EcoreFactory.eINSTANCE.createEAttribute();
+        c1.getEStructuralFeatures().add(c1_a2);
+
+        assertThat(sysONDefaultExplorerServices.hasChildren(ePackage, editingContext, List.of(), List.of())).isTrue();
+        assertThat(sysONDefaultExplorerServices.hasChildren(c1, editingContext, List.of(), List.of())).isTrue();
+        assertThat(sysONDefaultExplorerServices.hasChildren(c1_a1, editingContext, List.of(), List.of())).isFalse();
+    }
+
+    /**
+     * Create instances of services required to test hasChildren
+     * Use mock instances for non required services
+     */
+    private void createMockServicesForHasChildren() {
+
+        IIdentityService identityService = mock(IIdentityService.class);
+        IContentService contentService = mock(IContentService.class);
+        IRepresentationMetadataSearchService representationMetadataSearchService = mock(IRepresentationMetadataSearchService.class);
+
+        IObjectService objectService = mock(IObjectService.class);
+        IURLParser urlParser = mock(IURLParser.class);
+        List<IRepresentationImageProvider> representationImageProviders = new ArrayList<>();
+        IExplorerServices explorerServices = new ExplorerServices(objectService, urlParser, representationImageProviders, representationMetadataSearchService);
+
+        ISysONExplorerFilterService filterService = new SysONExplorerFilterService();
+
+        sysONDefaultExplorerServices = new SysONDefaultExplorerServices(identityService, contentService, representationMetadataSearchService, explorerServices, filterService);
+    }
+}

doc/content/modules/user-manual/pages/release-notes/2025.4.0.adoc

@@ -8,6 +8,8 @@ In such cases, delete the `SuccessionUsage` graphical node and recreate it graph
 
 == Bug fixes
 
+- In `Explorer View`, the fold/unfold arrow is now also available for non-sysml model elements.
+
 == New features
 
 == Improvements