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AddWidgetEventHandler.java
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AddWidgetEventHandler.java
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/*******************************************************************************
* Copyright (c) 2022, 2023 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.sirius.components.collaborative.formdescriptioneditors.handlers;
import java.util.List;
import java.util.Objects;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.sirius.components.collaborative.api.ChangeDescription;
import org.eclipse.sirius.components.collaborative.api.ChangeKind;
import org.eclipse.sirius.components.collaborative.api.Monitoring;
import org.eclipse.sirius.components.collaborative.formdescriptioneditors.api.IFormDescriptionEditorContext;
import org.eclipse.sirius.components.collaborative.formdescriptioneditors.api.IFormDescriptionEditorEventHandler;
import org.eclipse.sirius.components.collaborative.formdescriptioneditors.api.IFormDescriptionEditorInput;
import org.eclipse.sirius.components.collaborative.formdescriptioneditors.dto.AddWidgetInput;
import org.eclipse.sirius.components.collaborative.formdescriptioneditors.messages.ICollaborativeFormDescriptionEditorMessageService;
import org.eclipse.sirius.components.core.api.ErrorPayload;
import org.eclipse.sirius.components.core.api.IEditingContext;
import org.eclipse.sirius.components.core.api.IObjectService;
import org.eclipse.sirius.components.core.api.IPayload;
import org.eclipse.sirius.components.core.api.SuccessPayload;
import org.eclipse.sirius.components.formdescriptioneditors.IWidgetDescriptionProvider;
import org.eclipse.sirius.components.view.FlexDirection;
import org.eclipse.sirius.components.view.FlexboxContainerDescription;
import org.eclipse.sirius.components.view.GroupDescription;
import org.eclipse.sirius.components.view.ViewFactory;
import org.eclipse.sirius.components.view.ViewPackage;
import org.eclipse.sirius.components.view.WidgetDescription;
import org.springframework.stereotype.Service;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.MeterRegistry;
import reactor.core.publisher.Sinks.Many;
import reactor.core.publisher.Sinks.One;
/**
* Handle the add widget event on Form Description Editor.
*
* @author arichard
*/
@Service
public class AddWidgetEventHandler implements IFormDescriptionEditorEventHandler {
private final IObjectService objectService;
private final ICollaborativeFormDescriptionEditorMessageService messageService;
private final List<IWidgetDescriptionProvider> widgetDescriptionProviders;
private final Counter counter;
public AddWidgetEventHandler(IObjectService objectService, ICollaborativeFormDescriptionEditorMessageService messageService, List<IWidgetDescriptionProvider> widgetDescriptionProviders, MeterRegistry meterRegistry) {
this.objectService = Objects.requireNonNull(objectService);
this.messageService = Objects.requireNonNull(messageService);
this.widgetDescriptionProviders = Objects.requireNonNull(widgetDescriptionProviders);
// @formatter:off
this.counter = Counter.builder(Monitoring.EVENT_HANDLER)
.tag(Monitoring.NAME, this.getClass().getSimpleName())
.register(meterRegistry);
// @formatter:on
}
@Override
public boolean canHandle(IFormDescriptionEditorInput formDescriptionEditorInput) {
return formDescriptionEditorInput instanceof AddWidgetInput;
}
@Override
public void handle(One<IPayload> payloadSink, Many<ChangeDescription> changeDescriptionSink, IEditingContext editingContext, IFormDescriptionEditorContext formDescriptionEditorContext,
IFormDescriptionEditorInput formDescriptionEditorInput) {
this.counter.increment();
String message = this.messageService.invalidInput(formDescriptionEditorInput.getClass().getSimpleName(), AddWidgetInput.class.getSimpleName());
IPayload payload = new ErrorPayload(formDescriptionEditorInput.id(), message);
ChangeDescription changeDescription = new ChangeDescription(ChangeKind.NOTHING, formDescriptionEditorInput.representationId(), formDescriptionEditorInput);
if (formDescriptionEditorInput instanceof AddWidgetInput) {
String containerId = ((AddWidgetInput) formDescriptionEditorInput).containerId();
String kind = ((AddWidgetInput) formDescriptionEditorInput).kind();
int index = ((AddWidgetInput) formDescriptionEditorInput).index();
boolean addWidget = this.addWidget(editingContext, formDescriptionEditorContext, containerId, kind, index);
if (addWidget) {
payload = new SuccessPayload(formDescriptionEditorInput.id());
changeDescription = new ChangeDescription(ChangeKind.SEMANTIC_CHANGE, formDescriptionEditorInput.representationId(), formDescriptionEditorInput);
}
}
payloadSink.tryEmitValue(payload);
changeDescriptionSink.tryEmitNext(changeDescription);
}
private boolean addWidget(IEditingContext editingContext, IFormDescriptionEditorContext formDescriptionEditorContext, String containerId, String kind, int index) {
boolean success = false;
var optionalSelf = this.objectService.getObject(editingContext, containerId);
if (optionalSelf.isPresent()) {
Object container = optionalSelf.get();
EClassifier eClassifier = this.getWidgetDescriptionType(kind);
if (eClassifier instanceof EClass eClass) {
var widgetDescription = EcoreUtil.create(eClass);
if (widgetDescription instanceof FlexboxContainerDescription) {
((FlexboxContainerDescription) widgetDescription).setFlexDirection(FlexDirection.get(kind));
}
if (widgetDescription instanceof WidgetDescription) {
this.createStyle((WidgetDescription) widgetDescription);
if (container instanceof GroupDescription) {
((GroupDescription) container).getWidgets().add(index, (WidgetDescription) widgetDescription);
success = true;
} else if (container instanceof FlexboxContainerDescription) {
((FlexboxContainerDescription) container).getChildren().add(index, (WidgetDescription) widgetDescription);
success = true;
}
}
}
}
return success;
}
private EClassifier getWidgetDescriptionType(String kind) {
for (IWidgetDescriptionProvider widgetDescriptionProvider : this.widgetDescriptionProviders) {
var optionalType = widgetDescriptionProvider.getWidgetDescriptionType(kind);
if (optionalType.isPresent()) {
return optionalType.get();
}
}
return ViewPackage.eINSTANCE.getEClassifier(kind + "Description");
}
private void createStyle(WidgetDescription widgetDescription) {
EStructuralFeature styleFeature = widgetDescription.eClass().getEStructuralFeature("style");
if (styleFeature instanceof EReference) {
EClassifier eClassifier = styleFeature.getEType();
if (eClassifier instanceof EClass) {
var widgetDescriptionStyle = ViewFactory.eINSTANCE.create((EClass) eClassifier);
if (eClassifier.isInstance(widgetDescriptionStyle)) {
widgetDescription.eSet(styleFeature, widgetDescriptionStyle);
}
}
}
}
}