org.eclipse.osbp.ecview.core.common.editparts.emf/src/org/eclipse/osbp/ecview/core/common/editpart/emf/EmbeddableEditpart.java - osbp/org.eclipse.osbp.ecview.core - Git at Google

 /**
  * Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *         Florian Pirchner - Initial implementation
  */
 package org.eclipse.osbp.ecview.core.common.editpart.emf;

 import java.util.ArrayList;
 import java.util.List;

 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.ecore.EStructuralFeature;
 import org.eclipse.osbp.ecview.core.common.context.IViewContext;
 import org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart;
 import org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableParent;
 import org.eclipse.osbp.ecview.core.common.editpart.IViewEditpart;
 import org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart;
 import org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeBridge;
 import org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeChangeEvent;
 import org.eclipse.osbp.ecview.core.common.editpart.validation.IValidatorEditpart;
 import org.eclipse.osbp.ecview.core.common.editpart.visibility.IUiElementAccess;
 import org.eclipse.osbp.ecview.core.common.memento.IECViewMementoManager;
 import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddable;
 import org.eclipse.osbp.ecview.core.common.model.core.YLayout;
 import org.eclipse.osbp.ecview.core.common.model.core.YMemento;
 import org.eclipse.osbp.ecview.core.common.model.core.YView;
 import org.eclipse.osbp.ecview.core.common.model.datatypes.YDatatype;
 import org.eclipse.osbp.ecview.core.common.presentation.DelegatingPresenterFactory;
 import org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation;
 import org.eclipse.osbp.ecview.core.common.visibility.IVisibilityHandler;
 import org.eclipse.osbp.runtime.common.memento.IMementoHandler;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 // TODO: Auto-generated Javadoc
 /**
  * See {@link ElementEditpart}.
  *
  * @param <M>
  *            the generic type
  */
 public abstract class EmbeddableEditpart<M extends YEmbeddable> extends
 		ElementEditpart<M> implements IEmbeddableEditpart, DatatypeBridge,
 		IUiElementAccess {

 	/** The Constant LOGGER. */
 	private static final Logger LOGGER = LoggerFactory
 			.getLogger(EmbeddableEditpart.class);

 	/** The presentation. */
 	private IWidgetPresentation<?> presentation;

 	/** The datatype feature. */
 	private EStructuralFeature datatypeFeature;

 	/**
 	 * The default constructor.
 	 */
 	protected EmbeddableEditpart() {
 	}

 	/**
 	 * A constructor that becomes passed the datatype feature.
 	 *
 	 * @param datatypeFeature
 	 *            the datatype feature
 	 */
 	public EmbeddableEditpart(EStructuralFeature datatypeFeature) {
 		this.datatypeFeature = datatypeFeature;
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public IEmbeddableParent getParent() {
 		YLayout yParentLayout = getModel().getParent();
 		if (yParentLayout != null) {
 			return getEditpart(viewContext, yParentLayout);
 		} else {
 			YView yView = getModel().getView();
 			if (yView != null && yView.getContent() == getModel()) {
 				return (IViewEditpart) getEditpart(viewContext, yView);
 			}
 		}
 		return null;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#getView()
 	 */
 	@Override
 	public IViewEditpart getView() {
 		return viewContext.getViewEditpart();
 	}

 	/**
 	 * Returns the instance of the presentation, but does not load it.
 	 *
 	 * @param <A>
 	 *            An instance of {@link IWidgetPresentation}
 	 * @return presentation
 	 */
 	@SuppressWarnings("unchecked")
 	protected <A extends IWidgetPresentation<?>> A internalGetPresentation() {
 		return (A) presentation;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#getPresentation()
 	 */
 	@SuppressWarnings("unchecked")
 	@Override
 	public <A extends IWidgetPresentation<?>> A getPresentation() {
 		if (presentation == null) {
 			presentation = createPresenter();

 			doInitPresentation(presentation);
 		}
 		return (A) presentation;
 	}

 	/**
 	 * A hook method to initialize the presentation after creation.
 	 *
 	 * @param presentation
 	 *            the presentation
 	 */
 	protected void doInitPresentation(IWidgetPresentation<?> presentation) {

 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.visibility.IVisibilityProcessable#apply(org.eclipse.osbp.ecview.core.common.visibility.IVisibilityHandler)
 	 */
 	@Override
 	public void apply(IVisibilityHandler handler) {
 		IWidgetPresentation<?> presentation = getPresentation();
 		if (presentation != null) {
 			presentation.apply(handler);
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.visibility.IVisibilityProcessable#resetVisibilityProperties()
 	 */
 	@Override
 	public void resetVisibilityProperties() {
 		IWidgetPresentation<?> presentation = getPresentation();
 		if (presentation != null) {
 			presentation.resetVisibilityProperties();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#restoreMemento()
 	 */
 	@Override
 	public void restoreMemento() {
 		if (isRendered()) {
 			if (!(getPresentation() instanceof IMementoHandler)) {
 				throw new UnsupportedOperationException(
 						"Memento not supported by element.");
 			}

 			YMemento yMemento = loadMemento(getModel().getMementoId());
 			if (yMemento != null) {
 				((IMementoHandler) getPresentation()).applyMemento(yMemento);
 			} else {
 				LOGGER.debug("Memento is null. No apply to presentation. mementoId: "
 						+ getModel().getMementoId());
 			}
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#saveMemento(java.lang.Object)
 	 */
 	@Override
 	public void saveMemento(Object memento) {
 		if (isRendered()) {
 			if (!(getPresentation() instanceof IMementoHandler)) {
 				throw new UnsupportedOperationException(
 						"Memento not supported by element.");
 			}

 			YMemento yMemento = (YMemento) memento;
 			if (yMemento != null) {
 				IECViewMementoManager manager = getView().getContext()
 						.getService(IECViewMementoManager.class.getName());
 				if (manager != null) {
 					manager.saveMemento(yMemento.getId(), yMemento);
 				} else {
 					LOGGER.warn("IMementoManager is not available.");
 				}
 			} else {
 				LOGGER.warn("Memento is null. No save done. mementoId: "
 						+ memento);
 			}
 		}
 	}

 	/**
 	 * Load memento.
 	 *
 	 * @param mementoId
 	 *            the memento id
 	 * @return the y memento
 	 */
 	protected YMemento loadMemento(String mementoId) {
 		IECViewMementoManager manager = getView().getContext().getService(
 				IECViewMementoManager.class.getName());
 		if (manager == null) {
 			LOGGER.error("IMementoManager is not available.");
 			return null;
 		}
 		return (YMemento) manager.loadMemento(mementoId);
 	}

 	/**
 	 * Returns the datatype of the model. Or <code>null</code> if no datatype is
 	 * available.
 	 *
 	 * @return the y datatype
 	 */
 	protected YDatatype internalGetDatatype() {
 		if (datatypeFeature == null) {
 			return null;
 		}
 		return (YDatatype) getModel().eGet(datatypeFeature);
 	}

 	/**
 	 * Is called to created the presenter for this edit part.
 	 *
 	 * @param <A>
 	 *            the generic type
 	 * @return the a
 	 */
 	protected <A extends IWidgetPresentation<?>> A createPresenter() {
 		IViewEditpart viewEditPart = getView();
 		if (viewEditPart == null) {
 			LOGGER.info("View is null");
 			return null;
 		}
 		return DelegatingPresenterFactory.getInstance().createPresentation(
 				viewEditPart.getContext(), this);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.emf.ElementEditpart#initialize(org.eclipse.osbp.ecview.core.common.model.core.YElement)
 	 */
 	@Override
 	public void initialize(IViewContext context, M model) {
 		super.initialize(context, model);

 		// directly after initialization the embeddable needs to become
 		// registered at the datatype editpart. No lazy loading can be used
 		// here.
 		registerAtDatatype();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.emf.ElementEditpart#handleModelSet(int, org.eclipse.emf.common.notify.Notification)
 	 */
 	@Override
 	protected void handleModelSet(int featureId, Notification notification) {
 		checkDisposed();

 		if (notification.getFeature() == datatypeFeature) {
 			YDatatype oldYDatatype = (YDatatype) notification.getOldValue();
 			if (oldYDatatype != null) {
 				// unregister the element from the old datatype
 				unregisterFromDatatype(oldYDatatype);
 			}

 			// an register the field to the new datatype if available
 			YDatatype newYDatatype = (YDatatype) notification.getNewValue();
 			if (newYDatatype != null) {
 				registerAtDatatype();
 			}
 		} else {
 			super.handleModelSet(featureId, notification);
 		}
 	}

 	/**
 	 * Registers the element at the datatype. Changes on the datatype will
 	 * update the embeddable.
 	 */
 	protected void registerAtDatatype() {
 		// unregisters the datatype editpart
 		YDatatype yDatatype = internalGetDatatype();
 		if (yDatatype != null) {
 			IDatatypeEditpart datatypeEditpart = getEditpart(viewContext, yDatatype);
 			datatypeEditpart.addBridge(this);

 			notifyDatatypeChanged(datatypeEditpart.getCurrentState());
 		}
 	}

 	/**
 	 * Unregisters the element from the datatype. So changes on the datatype do
 	 * not update the embeddable anymore.
 	 *
 	 * @param yDatatype
 	 *            the y datatype
 	 */
 	protected void unregisterFromDatatype(YDatatype yDatatype) {
 		// unregisters the datatype editpart
 		if (yDatatype != null) {
 			IDatatypeEditpart datatypeEditpart = getEditpart(viewContext, yDatatype);
 			datatypeEditpart.removeBridge(this);
 			notifyDatatypeChanged(createDatatypeUnsetEvent(datatypeEditpart));
 		}
 	}

 	/**
 	 * Create an internal event that resets the datatype information.
 	 *
 	 * @param datatypeEditpart
 	 *            the datatype editpart
 	 * @return the datatype change event
 	 */
 	private DatatypeChangeEvent createDatatypeUnsetEvent(
 			IDatatypeEditpart datatypeEditpart) {

 		List<IValidatorEditpart> toRemove = new ArrayList<>(
 				getDatatypeValidators());
 		DatatypeChangeEvent event = new DatatypeChangeEvent(true,
 				datatypeEditpart, null, null, toRemove);
 		return event;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeBridge#notifyDatatypeChanged(org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeChangeEvent)
 	 */
 	@Override
 	public void notifyDatatypeChanged(DatatypeChangeEvent event) {
 		IWidgetPresentation<?> presentation = getPresentation();
 		if (presentation != null) {
 			presentation.notifyDatatypeChanged(event);
 		} else {
 			LOGGER.warn("Presentation is null for " + getModel());
 		}
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	protected void internalDispose() {
 		try {
 			// unregister the element from the datatype
 			YDatatype yDatatype = internalGetDatatype();
 			if (yDatatype != null) {
 				unregisterFromDatatype(yDatatype);
 			}

 			// dispose the presenter
 			//
 			if (presentation != null) {
 				presentation.dispose();
 				presentation = null;
 			}

 		} finally {
 			super.internalDispose();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#requestRender()
 	 */
 	@Override
 	public void requestRender() {
 		if (getParent() != null) {
 			getParent().renderChild(this);
 		} else {
 			unrender();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#render(java.lang.Object)
 	 */
 	@Override
 	public Object render(Object parentWidget) {
 		if (getPresentation() == null) {
 			throw new IllegalStateException("No presentation for " + getModel());
 		}
 		return getPresentation().createWidget(parentWidget);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#requestUnrender()
 	 */
 	@Override
 	public void requestUnrender() {
 		if (getParent() != null) {
 			getParent().unrenderChild(this);
 		} else {
 			unrender();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#unrender()
 	 */
 	@Override
 	public void unrender() {
 		IWidgetPresentation<?> presentation = getPresentation();
 		if (presentation != null) {
 			presentation.unrender();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#isRendered()
 	 */
 	@Override
 	public boolean isRendered() {
 		return internalGetPresentation() != null
 				&& internalGetPresentation().isRendered();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#getWidget()
 	 */
 	@Override
 	public Object getWidget() {
 		IWidgetPresentation<?> presentation = getPresentation();
 		if (presentation != null) {
 			return presentation.getWidget();
 		}
 		return null;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.common.editpart.emf.ElementEditpart#requestDispose()
 	 */
 	@Override
 	public void requestDispose() {
 		if (getParent() != null) {
 			getParent().disposeChild(this);
 		} else {
 			// in case where the embeddable is not added to a layout
 			dispose();
 		}
 	}
 }
	/**
	* Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* Florian Pirchner - Initial implementation
	*/
	package org.eclipse.osbp.ecview.core.common.editpart.emf;

	import java.util.ArrayList;
	import java.util.List;

	import org.eclipse.emf.common.notify.Notification;
	import org.eclipse.emf.ecore.EStructuralFeature;
	import org.eclipse.osbp.ecview.core.common.context.IViewContext;
	import org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart;
	import org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableParent;
	import org.eclipse.osbp.ecview.core.common.editpart.IViewEditpart;
	import org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart;
	import org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeBridge;
	import org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeChangeEvent;
	import org.eclipse.osbp.ecview.core.common.editpart.validation.IValidatorEditpart;
	import org.eclipse.osbp.ecview.core.common.editpart.visibility.IUiElementAccess;
	import org.eclipse.osbp.ecview.core.common.memento.IECViewMementoManager;
	import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddable;
	import org.eclipse.osbp.ecview.core.common.model.core.YLayout;
	import org.eclipse.osbp.ecview.core.common.model.core.YMemento;
	import org.eclipse.osbp.ecview.core.common.model.core.YView;
	import org.eclipse.osbp.ecview.core.common.model.datatypes.YDatatype;
	import org.eclipse.osbp.ecview.core.common.presentation.DelegatingPresenterFactory;
	import org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation;
	import org.eclipse.osbp.ecview.core.common.visibility.IVisibilityHandler;
	import org.eclipse.osbp.runtime.common.memento.IMementoHandler;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	// TODO: Auto-generated Javadoc
	/**
	* See {@link ElementEditpart}.
	*
	* @param <M>
	* the generic type
	*/
	public abstract class EmbeddableEditpart<M extends YEmbeddable> extends
	ElementEditpart<M> implements IEmbeddableEditpart, DatatypeBridge,
	IUiElementAccess {

	/** The Constant LOGGER. */
	private static final Logger LOGGER = LoggerFactory
	.getLogger(EmbeddableEditpart.class);

	/** The presentation. */
	private IWidgetPresentation<?> presentation;

	/** The datatype feature. */
	private EStructuralFeature datatypeFeature;

	/**
	* The default constructor.
	*/
	protected EmbeddableEditpart() {
	}

	/**
	* A constructor that becomes passed the datatype feature.
	*
	* @param datatypeFeature
	* the datatype feature
	*/
	public EmbeddableEditpart(EStructuralFeature datatypeFeature) {
	this.datatypeFeature = datatypeFeature;
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public IEmbeddableParent getParent() {
	YLayout yParentLayout = getModel().getParent();
	if (yParentLayout != null) {
	return getEditpart(viewContext, yParentLayout);
	} else {
	YView yView = getModel().getView();
	if (yView != null && yView.getContent() == getModel()) {
	return (IViewEditpart) getEditpart(viewContext, yView);
	}
	}
	return null;
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#getView()
	*/
	@Override
	public IViewEditpart getView() {
	return viewContext.getViewEditpart();
	}

	/**
	* Returns the instance of the presentation, but does not load it.
	*
	* @param <A>
	* An instance of {@link IWidgetPresentation}
	* @return presentation
	*/
	@SuppressWarnings("unchecked")
	protected <A extends IWidgetPresentation<?>> A internalGetPresentation() {
	return (A) presentation;
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#getPresentation()
	*/
	@SuppressWarnings("unchecked")
	@Override
	public <A extends IWidgetPresentation<?>> A getPresentation() {
	if (presentation == null) {
	presentation = createPresenter();

	doInitPresentation(presentation);
	}
	return (A) presentation;
	}

	/**
	* A hook method to initialize the presentation after creation.
	*
	* @param presentation
	* the presentation
	*/
	protected void doInitPresentation(IWidgetPresentation<?> presentation) {

	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.visibility.IVisibilityProcessable#apply(org.eclipse.osbp.ecview.core.common.visibility.IVisibilityHandler)
	*/
	@Override
	public void apply(IVisibilityHandler handler) {
	IWidgetPresentation<?> presentation = getPresentation();
	if (presentation != null) {
	presentation.apply(handler);
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.visibility.IVisibilityProcessable#resetVisibilityProperties()
	*/
	@Override
	public void resetVisibilityProperties() {
	IWidgetPresentation<?> presentation = getPresentation();
	if (presentation != null) {
	presentation.resetVisibilityProperties();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#restoreMemento()
	*/
	@Override
	public void restoreMemento() {
	if (isRendered()) {
	if (!(getPresentation() instanceof IMementoHandler)) {
	throw new UnsupportedOperationException(
	"Memento not supported by element.");
	}

	YMemento yMemento = loadMemento(getModel().getMementoId());
	if (yMemento != null) {
	((IMementoHandler) getPresentation()).applyMemento(yMemento);
	} else {
	LOGGER.debug("Memento is null. No apply to presentation. mementoId: "
	+ getModel().getMementoId());
	}
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#saveMemento(java.lang.Object)
	*/
	@Override
	public void saveMemento(Object memento) {
	if (isRendered()) {
	if (!(getPresentation() instanceof IMementoHandler)) {
	throw new UnsupportedOperationException(
	"Memento not supported by element.");
	}

	YMemento yMemento = (YMemento) memento;
	if (yMemento != null) {
	IECViewMementoManager manager = getView().getContext()
	.getService(IECViewMementoManager.class.getName());
	if (manager != null) {
	manager.saveMemento(yMemento.getId(), yMemento);
	} else {
	LOGGER.warn("IMementoManager is not available.");
	}
	} else {
	LOGGER.warn("Memento is null. No save done. mementoId: "
	+ memento);
	}
	}
	}

	/**
	* Load memento.
	*
	* @param mementoId
	* the memento id
	* @return the y memento
	*/
	protected YMemento loadMemento(String mementoId) {
	IECViewMementoManager manager = getView().getContext().getService(
	IECViewMementoManager.class.getName());
	if (manager == null) {
	LOGGER.error("IMementoManager is not available.");
	return null;
	}
	return (YMemento) manager.loadMemento(mementoId);
	}

	/**
	* Returns the datatype of the model. Or <code>null</code> if no datatype is
	* available.
	*
	* @return the y datatype
	*/
	protected YDatatype internalGetDatatype() {
	if (datatypeFeature == null) {
	return null;
	}
	return (YDatatype) getModel().eGet(datatypeFeature);
	}

	/**
	* Is called to created the presenter for this edit part.
	*
	* @param <A>
	* the generic type
	* @return the a
	*/
	protected <A extends IWidgetPresentation<?>> A createPresenter() {
	IViewEditpart viewEditPart = getView();
	if (viewEditPart == null) {
	LOGGER.info("View is null");
	return null;
	}
	return DelegatingPresenterFactory.getInstance().createPresentation(
	viewEditPart.getContext(), this);
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.emf.ElementEditpart#initialize(org.eclipse.osbp.ecview.core.common.model.core.YElement)
	*/
	@Override
	public void initialize(IViewContext context, M model) {
	super.initialize(context, model);

	// directly after initialization the embeddable needs to become
	// registered at the datatype editpart. No lazy loading can be used
	// here.
	registerAtDatatype();
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.emf.ElementEditpart#handleModelSet(int, org.eclipse.emf.common.notify.Notification)
	*/
	@Override
	protected void handleModelSet(int featureId, Notification notification) {
	checkDisposed();

	if (notification.getFeature() == datatypeFeature) {
	YDatatype oldYDatatype = (YDatatype) notification.getOldValue();
	if (oldYDatatype != null) {
	// unregister the element from the old datatype
	unregisterFromDatatype(oldYDatatype);
	}

	// an register the field to the new datatype if available
	YDatatype newYDatatype = (YDatatype) notification.getNewValue();
	if (newYDatatype != null) {
	registerAtDatatype();
	}
	} else {
	super.handleModelSet(featureId, notification);
	}
	}

	/**
	* Registers the element at the datatype. Changes on the datatype will
	* update the embeddable.
	*/
	protected void registerAtDatatype() {
	// unregisters the datatype editpart
	YDatatype yDatatype = internalGetDatatype();
	if (yDatatype != null) {
	IDatatypeEditpart datatypeEditpart = getEditpart(viewContext, yDatatype);
	datatypeEditpart.addBridge(this);

	notifyDatatypeChanged(datatypeEditpart.getCurrentState());
	}
	}

	/**
	* Unregisters the element from the datatype. So changes on the datatype do
	* not update the embeddable anymore.
	*
	* @param yDatatype
	* the y datatype
	*/
	protected void unregisterFromDatatype(YDatatype yDatatype) {
	// unregisters the datatype editpart
	if (yDatatype != null) {
	IDatatypeEditpart datatypeEditpart = getEditpart(viewContext, yDatatype);
	datatypeEditpart.removeBridge(this);
	notifyDatatypeChanged(createDatatypeUnsetEvent(datatypeEditpart));
	}
	}

	/**
	* Create an internal event that resets the datatype information.
	*
	* @param datatypeEditpart
	* the datatype editpart
	* @return the datatype change event
	*/
	private DatatypeChangeEvent createDatatypeUnsetEvent(
	IDatatypeEditpart datatypeEditpart) {

	List<IValidatorEditpart> toRemove = new ArrayList<>(
	getDatatypeValidators());
	DatatypeChangeEvent event = new DatatypeChangeEvent(true,
	datatypeEditpart, null, null, toRemove);
	return event;
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeBridge#notifyDatatypeChanged(org.eclipse.osbp.ecview.core.common.editpart.datatypes.IDatatypeEditpart.DatatypeChangeEvent)
	*/
	@Override
	public void notifyDatatypeChanged(DatatypeChangeEvent event) {
	IWidgetPresentation<?> presentation = getPresentation();
	if (presentation != null) {
	presentation.notifyDatatypeChanged(event);
	} else {
	LOGGER.warn("Presentation is null for " + getModel());
	}
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected void internalDispose() {
	try {
	// unregister the element from the datatype
	YDatatype yDatatype = internalGetDatatype();
	if (yDatatype != null) {
	unregisterFromDatatype(yDatatype);
	}

	// dispose the presenter
	//
	if (presentation != null) {
	presentation.dispose();
	presentation = null;
	}

	} finally {
	super.internalDispose();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#requestRender()
	*/
	@Override
	public void requestRender() {
	if (getParent() != null) {
	getParent().renderChild(this);
	} else {
	unrender();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#render(java.lang.Object)
	*/
	@Override
	public Object render(Object parentWidget) {
	if (getPresentation() == null) {
	throw new IllegalStateException("No presentation for " + getModel());
	}
	return getPresentation().createWidget(parentWidget);
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#requestUnrender()
	*/
	@Override
	public void requestUnrender() {
	if (getParent() != null) {
	getParent().unrenderChild(this);
	} else {
	unrender();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#unrender()
	*/
	@Override
	public void unrender() {
	IWidgetPresentation<?> presentation = getPresentation();
	if (presentation != null) {
	presentation.unrender();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#isRendered()
	*/
	@Override
	public boolean isRendered() {
	return internalGetPresentation() != null
	&& internalGetPresentation().isRendered();
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.IEmbeddableEditpart#getWidget()
	*/
	@Override
	public Object getWidget() {
	IWidgetPresentation<?> presentation = getPresentation();
	if (presentation != null) {
	return presentation.getWidget();
	}
	return null;
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.common.editpart.emf.ElementEditpart#requestDispose()
	*/
	@Override
	public void requestDispose() {
	if (getParent() != null) {
	getParent().disposeChild(this);
	} else {
	// in case where the embeddable is not added to a layout
	dispose();
	}
	}
	}