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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.form.FlexDirection;
import org.eclipse.sirius.components.view.form.FlexboxContainerDescription;
import org.eclipse.sirius.components.view.form.FormElementDescription;
import org.eclipse.sirius.components.view.form.FormElementFor;
import org.eclipse.sirius.components.view.form.FormElementIf;
import org.eclipse.sirius.components.view.form.FormFactory;
import org.eclipse.sirius.components.view.form.FormPackage;
import org.eclipse.sirius.components.view.form.GroupDescription;
import org.eclipse.sirius.components.view.form.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 addWidgetInput) {
String containerId = addWidgetInput.containerId();
String kind = addWidgetInput.kind();
int index = addWidgetInput.index();
boolean widgetAdded = this.addWidget(editingContext, containerId, kind, index);
if (widgetAdded) {
payload = new SuccessPayload(addWidgetInput.id());
changeDescription = new ChangeDescription(ChangeKind.SEMANTIC_CHANGE, formDescriptionEditorInput.representationId(), addWidgetInput);
}
}
payloadSink.tryEmitValue(payload);
changeDescriptionSink.tryEmitNext(changeDescription);
}
private boolean addWidget(IEditingContext editingContext, 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 newElement = EcoreUtil.create(eClass);
if (newElement instanceof FlexboxContainerDescription flexboxContainerDescription) {
flexboxContainerDescription.setFlexDirection(FlexDirection.get(kind));
}
if (newElement instanceof FormElementDescription formElementDescription) {
if (newElement instanceof WidgetDescription widgetDescription) {
this.createStyle(widgetDescription);
}
if (container instanceof GroupDescription groupDescription) {
groupDescription.getChildren().add(index, formElementDescription);
success = true;
} else if (container instanceof FlexboxContainerDescription flexboxContainerDescription) {
flexboxContainerDescription.getChildren().add(index, formElementDescription);
success = true;
} else if (container instanceof FormElementFor formElementFor) {
formElementFor.getChildren().add(index, formElementDescription);
success = true;
} else if (container instanceof FormElementIf formElementIf) {
formElementIf.getChildren().add(index, formElementDescription);
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();
}
}
EClassifier result = null;
if (Objects.equals(FormPackage.Literals.FORM_ELEMENT_IF.getName(), kind)) {
result = FormPackage.Literals.FORM_ELEMENT_IF;
} else if (Objects.equals(FormPackage.Literals.FORM_ELEMENT_FOR.getName(), kind)) {
result = FormPackage.Literals.FORM_ELEMENT_FOR;
} else {
result = FormPackage.eINSTANCE.getEClassifier(kind + "Description");
}
return result;
}
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 = FormFactory.eINSTANCE.create((EClass) eClassifier);
if (eClassifier.isInstance(widgetDescriptionStyle)) {
widgetDescription.eSet(styleFeature, widgetDescriptionStyle);
}
}
}
}
}