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/*******************************************************************************
* Copyright (c) 2010-2012, Andras Okros, Tamas Szabo, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.viatra.query.runtime.ui.modelconnector;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.eclipse.core.runtime.ILog;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.common.ui.viewer.IViewerProvider;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.domain.IEditingDomainProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.viatra.query.runtime.api.IModelConnectorTypeEnum;
import org.eclipse.viatra.query.runtime.matchers.util.Preconditions;
import org.eclipse.viatra.query.runtime.ui.ViatraQueryRuntimeUIPlugin;
import org.eclipse.viatra.query.runtime.ui.modelconnector.internal.ModelEditorPartListener;
/**
* Model connector implementation for the default EMF generated model editors.
*/
public class EMFModelConnector implements IModelConnector {
private static final String LISTENER_NULL_MSG = "Listener cannot be null!";
protected IEditorPart editorPart;
protected ILog logger;
protected IWorkbenchPage workbenchPage;
private ModelEditorPartListener modelEditorPartListener;
private Set<IModelConnectorListener> listeners;
public EMFModelConnector(IEditorPart editorPart) {
super();
this.logger = ViatraQueryRuntimeUIPlugin.getDefault().getLog();
this.editorPart = editorPart;
this.listeners = new HashSet<>();
}
@Override
public void loadModel(IModelConnectorTypeEnum modelConnectorTypeEnum) {
Notifier notifier = getNotifier(modelConnectorTypeEnum);
if (notifier != null) {
workbenchPage = editorPart.getSite().getPage();
modelEditorPartListener = new ModelEditorPartListener(this);
workbenchPage.addPartListener(modelEditorPartListener);
}
}
@Override
public void unloadModel() {
for (IModelConnectorListener listener : listeners) {
listener.modelUnloaded(this);
}
workbenchPage.removePartListener(modelEditorPartListener);
}
@Override
public void showLocation(Object[] locationObjects) {
IStructuredSelection preparedSelection = prepareSelection(locationObjects);
navigateToElements(editorPart, preparedSelection);
workbenchPage.bringToTop(editorPart);
if (editorPart instanceof ISelectionProvider) {
ISelectionProvider selectionProvider = (ISelectionProvider) editorPart;
selectionProvider.setSelection(preparedSelection);
}
reflectiveSetSelection(editorPart, preparedSelection);
}
@Override
public Notifier getNotifier(IModelConnectorTypeEnum modelConnectorTypeEnum) {
Notifier result = null;
if (IModelConnectorTypeEnum.RESOURCESET.equals(modelConnectorTypeEnum)) {
if (editorPart instanceof IEditingDomainProvider) {
IEditingDomainProvider editingDomainProvider = (IEditingDomainProvider) editorPart;
result = editingDomainProvider.getEditingDomain().getResourceSet();
}
} else if (IModelConnectorTypeEnum.RESOURCE.equals(modelConnectorTypeEnum) && editorPart instanceof ISelectionProvider) {
ISelectionProvider selectionProvider = (ISelectionProvider) editorPart;
if (selectionProvider.getSelection() instanceof TreeSelection) {
Object object = ((TreeSelection) selectionProvider.getSelection()).getFirstElement();
if (object instanceof Resource) {
result = (Resource) object;
} else if (object instanceof EObject) {
result = ((EObject) object).eResource();
}
}
}
return result;
}
/**
* This is a somewhat "hackish" workaround in case the selection setting through the provider doesn't work.
*
* Unfortunately, this seems to be the most reliable way to do this. *sigh*
*
*/
private void reflectiveSetSelection(IEditorPart editorPart, IStructuredSelection preparedSelection) {
if (editorPart instanceof IViewerProvider
&& (((IViewerProvider) editorPart).getViewer() instanceof TreeViewer)) {
try {
Method m = editorPart.getClass().getMethod("setSelectionToViewer", Collection.class);
if (m!=null) {
m.invoke(editorPart, preparedSelection.toList());
}
} catch (Exception e) {
logger.log(new Status(IStatus.INFO, ViatraQueryRuntimeUIPlugin.PLUGIN_ID, "Error while setting selection. If this is not an EMF Tree editor, consider providing a specialized ModelConnector implementation.", e));
}
}
}
protected TreeSelection prepareSelection(Object[] locationObjects) {
List<TreePath> paths = new ArrayList<>();
for (Object o : locationObjects) {
if (o instanceof EObject) {
TreePath path = createTreePath(editorPart, (EObject) o);
if (path != null) {
paths.add(path);
}
}
}
return paths.isEmpty() ? new TreeSelection() : new TreeSelection(paths.toArray(new TreePath[1]));
}
protected void navigateToElements(IEditorPart editorPart, IStructuredSelection selection) {
// ISelectionProvider selectionProvider = editorPart.getEditorSite().getSelectionProvider();
ISelectionProvider selectionProvider = editorPart.getSite().getSelectionProvider();
selectionProvider.setSelection(selection);
}
protected TreePath createTreePath(IEditorPart editorPart, EObject obj) {
List<Object> nodes = new LinkedList<>();
nodes.add(obj);
EObject tmp = obj.eContainer();
while (tmp != null) {
nodes.add(0, tmp);
tmp = tmp.eContainer();
}
return new TreePath(nodes.toArray());
}
@Override
public IWorkbenchPart getOwner() {
return this.editorPart;
}
@Override
public Collection<EObject> getSelectedEObjects() {
return getSelectedEObjects(getCurrentSelection());
}
protected ISelection getCurrentSelection() {
ISelectionProvider selectionProvider = editorPart.getSite().getSelectionProvider();
return selectionProvider.getSelection();
}
protected Collection<EObject> getSelectedEObjects(ISelection selection) {
if (selection instanceof IStructuredSelection) {
return Arrays.stream(((IStructuredSelection) selection).toArray())
.filter(EObject.class::isInstance)
.map(EObject.class::cast).collect(Collectors.toList());
} else {
return Collections.emptyList();
}
}
public boolean addListener(IModelConnectorListener listener) {
Preconditions.checkArgument(listener != null, LISTENER_NULL_MSG);
return listeners.add(listener);
}
public boolean removeListener(IModelConnectorListener listener) {
Preconditions.checkArgument(listener != null, LISTENER_NULL_MSG);
return listeners.remove(listener);
}
}
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