org.eclipse.osbp.runtime.web.ecview.presentation.vaadin/src/org/eclipse/osbp/runtime/web/ecview/presentation/vaadin/internal/ComboBoxPresentation.java - osbp/org.eclipse.osbp.runtime.web - 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.runtime.web.ecview.presentation.vaadin.internal;

 import java.util.Locale;

 import org.eclipse.core.databinding.observable.IObservable;
 import org.eclipse.core.databinding.observable.list.IObservableList;
 import org.eclipse.core.databinding.observable.value.IObservableValue;
 import org.eclipse.emf.databinding.EMFProperties;
 import org.eclipse.osbp.ecview.core.common.editpart.IElementEditpart;
 import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableBindingEndpoint;
 import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableCollectionEndpoint;
 import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableSelectionEndpoint;
 import org.eclipse.osbp.ecview.core.databinding.emf.model.ECViewModelBindable;
 import org.eclipse.osbp.ecview.core.extension.model.extension.ExtensionModelPackage;
 import org.eclipse.osbp.ecview.core.extension.model.extension.YComboBox;
 import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.IComboBoxEditpart;
 import org.eclipse.osbp.runtime.common.state.ISharedStateContext;
 import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractFieldWidgetPresenter;
 import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal.util.Util;
 import org.eclipse.osbp.runtime.web.vaadin.common.data.BeanServiceLazyLoadingContainer;
 import org.eclipse.osbp.runtime.web.vaadin.common.data.DeepResolvingBeanItemContainer;
 import org.eclipse.osbp.runtime.web.vaadin.common.data.IBeanSearchServiceFactory;
 import org.eclipse.osbp.runtime.web.vaadin.components.widget.LazyLoadingComboBox;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 import com.vaadin.data.Container;
 import com.vaadin.data.Container.Sortable;
 import com.vaadin.data.Property;
 import com.vaadin.data.util.ObjectProperty;
 import com.vaadin.server.Resource;
 import com.vaadin.server.ThemeResource;
 import com.vaadin.ui.AbstractSelect.ItemCaptionMode;
 import com.vaadin.ui.Component;
 import com.vaadin.ui.ComponentContainer;
 import com.vaadin.ui.Field;

 // TODO: Auto-generated Javadoc
 /**
  * This presenter is responsible to render a combo box on the given layout.
  */
 @SuppressWarnings("restriction")
 public class ComboBoxPresentation extends AbstractFieldWidgetPresenter<Component> {

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

 	/** The model access. */
 	private final ModelAccess modelAccess;

 	/** The combo. */
 	private LazyLoadingComboBox combo;

 	/** The property. */
 	@SuppressWarnings("rawtypes")
 	private ObjectProperty property;

 	/**
 	 * Constructor.
 	 *
 	 * @param editpart
 	 *            The editpart of that presenter
 	 */
 	public ComboBoxPresentation(IElementEditpart editpart) {
 		super((IComboBoxEditpart) editpart);
 		this.modelAccess = new ModelAccess((YComboBox) editpart.getModel());
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	@Override
 	public Component doCreateWidget(Object parent) {
 		if (combo == null) {

 			combo = new CustomComboBox();
 			combo.addStyleName(CSS_CLASS_CONTROL);
 			combo.setImmediate(true);
 			setupComponent(combo, getCastedModel());

 			associateWidget(combo, modelAccess.yField);
 			if (modelAccess.isCssIdValid()) {
 				combo.setId(modelAccess.getCssID());
 			} else {
 				combo.setId(getEditpart().getId());
 			}

 			if (modelAccess.isCssClassValid()) {
 				combo.addStyleName(modelAccess.getCssClass());
 			}

 			try {
 				property = new ObjectProperty(null, modelAccess.yField.getModelSelectionType());
 				combo.setPropertyDataSource(property);

 				if (modelAccess.yField.getType() != null) {
 					if (!modelAccess.yField.isUseBeanService()) {
 						DeepResolvingBeanItemContainer datasource = new DeepResolvingBeanItemContainer(
 								modelAccess.yField.getType());
 						combo.setContainerDataSource(datasource);
 					} else {
 						IBeanSearchServiceFactory factory = getViewContext()
 								.getService(IBeanSearchServiceFactory.class.getName());
 						if (factory != null) {
 							ISharedStateContext sharedState = getViewContext()
 									.getService(ISharedStateContext.class.getName());
 							BeanServiceLazyLoadingContainer<?> datasource = new BeanServiceLazyLoadingContainer(
 									factory.createService(modelAccess.yField.getType()), modelAccess.yField.getType(),
 									sharedState);
 							combo.setContainerDataSource(datasource);
 						}
 					}
 				}

 				String itemCaptionProperty = modelAccess.yField.getCaptionProperty();
 				if (itemCaptionProperty != null && !itemCaptionProperty.equals("")) {
 					combo.setItemCaptionPropertyId(itemCaptionProperty);
 					combo.setItemCaptionMode(ItemCaptionMode.PROPERTY);

 					Container container = combo.getContainerDataSource();
 					if (container instanceof Container.Sortable) {
 						Container.Sortable sortable = (Sortable) container;
 						sortable.sort(new Object[] { itemCaptionProperty }, new boolean[] { true });
 					}
 				} else {
 					combo.setItemCaptionMode(ItemCaptionMode.ID);
 				}

 				String itemImageProperty = modelAccess.yField.getImageProperty();
 				if (itemImageProperty != null && !itemImageProperty.equals("")) {
 					combo.setItemIconPropertyId(itemImageProperty);
 				}

 				// creates the binding for the field
 				createBindings(modelAccess.yField, combo);

 				if (modelAccess.isCssClassValid()) {
 					combo.addStyleName(modelAccess.getCssClass());
 				}

 				applyCaptions();

 				initializeField(combo);
 			} catch (Exception e) {
 				LOGGER.error("{}", e);
 			}
 		}
 		return combo;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.
 	 * AbstractVaadinWidgetPresenter#doUpdateLocale(java.util.Locale)
 	 */
 	@Override
 	protected void doUpdateLocale(Locale locale) {
 		// no need to set the locale to the ui elements. Is handled by vaadin
 		// internally.

 		// update the captions
 		applyCaptions();
 	}

 	/**
 	 * Applies the labels to the widgets.
 	 */
 	protected void applyCaptions() {
 		Util.applyCaptions(getI18nService(), modelAccess.getLabel(), modelAccess.getLabelI18nKey(), getLocale(), combo);
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.
 	 * AbstractFieldWidgetPresenter#doGetField()
 	 */
 	@Override
 	protected Field<?> doGetField() {
 		return combo;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.
 	 * AbstractVaadinWidgetPresenter#internalGetObservableEndpoint(org.eclipse.
 	 * osbp.ecview.core.common.model.core.YEmbeddableBindingEndpoint)
 	 */
 	@Override
 	protected IObservable internalGetObservableEndpoint(YEmbeddableBindingEndpoint bindableValue) {
 		if (bindableValue == null) {
 			throw new IllegalArgumentException("BindableValue must not be null!");
 		}

 		if (bindableValue instanceof YEmbeddableCollectionEndpoint) {
 			return internalGetCollectionEndpoint();
 		} else if (bindableValue instanceof YEmbeddableSelectionEndpoint) {
 			return internalGetSelectionEndpoint((YEmbeddableSelectionEndpoint) bindableValue);
 		}
 		throw new IllegalArgumentException("Not a valid input: " + bindableValue);
 	}

 	/**
 	 * Returns the observable to observe the collection.
 	 *
 	 * @return the i observable list
 	 */
 	protected IObservableList internalGetCollectionEndpoint() {
 		// return the observable value for text
 		return EMFProperties.list(ExtensionModelPackage.Literals.YCOMBO_BOX__COLLECTION).observe(getModel());
 	}

 	/**
 	 * Returns the observable to observe the selection.
 	 *
 	 * @param yEndpoint
 	 *            the y endpoint
 	 * @return the i observable value
 	 */
 	protected IObservableValue internalGetSelectionEndpoint(YEmbeddableSelectionEndpoint yEndpoint) {

 		String attributePath = ECViewModelBindable
 				.getAttributePath(ExtensionModelPackage.Literals.YCOMBO_BOX__SELECTION, yEndpoint.getAttributePath());

 		// return the observable value for text
 		return ECViewModelBindable.observeValue(castEObject(getModel()), attributePath, modelAccess.yField.getType(),
 				modelAccess.yField.getEmfNsURI());
 	}

 	/**
 	 * Creates the bindings for the given values.
 	 *
 	 * @param yField
 	 *            the y field
 	 * @param field
 	 *            the field
 	 */
 	protected void createBindings(YComboBox yField, LazyLoadingComboBox field) {

 		if (!modelAccess.yField.isUseBeanService()) {
 			// create the model binding from ridget to ECView-model
 			registerBinding(createBindings_ContainerContents(castEObject(getModel()),
 					ExtensionModelPackage.Literals.YCOMBO_BOX__COLLECTION, field, yField.getType()));
 		}

 		// create the model binding from ridget to ECView-model
 		registerBinding(createBindingsSelection(castEObject(getModel()),
 				ExtensionModelPackage.Literals.YCOMBO_BOX__SELECTION, field, yField.getModelSelectionType()));

 		super.createBindings(yField, field, null);
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see
 	 * org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation#
 	 * getWidget()
 	 */
 	@Override
 	public Component getWidget() {
 		return combo;
 	}

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

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public void doUnrender() {
 		if (combo != null) {

 			// unbind all active bindings
 			unbind();

 			Component parent = ((Component) combo.getParent());
 			if (parent != null && parent instanceof ComponentContainer) {
 				((ComponentContainer) parent).removeComponent(combo);
 			}

 			// remove assocations
 			unassociateWidget(combo);

 			combo = null;
 		}
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	protected void internalDispose() {
 		try {
 			unrender();
 		} finally {
 			super.internalDispose();
 		}
 	}

 	/**
 	 * A helper class.
 	 */
 	private static class ModelAccess {

 		/** The y field. */
 		private final YComboBox yField;

 		/**
 		 * Instantiates a new model access.
 		 *
 		 * @param yField
 		 *            the y field
 		 */
 		public ModelAccess(YComboBox yField) {
 			super();
 			this.yField = yField;
 		}

 		/**
 		 * Gets the css class.
 		 *
 		 * @return the css class
 		 * @see org.eclipse.osbp.ecview.core.ui.core.model.core.YCssAble#getCssClass()
 		 */
 		public String getCssClass() {
 			return yField.getCssClass();
 		}

 		/**
 		 * Returns true, if the css class is not null and not empty.
 		 *
 		 * @return true, if is css class valid
 		 */
 		public boolean isCssClassValid() {
 			return getCssClass() != null && !getCssClass().equals("");
 		}

 		/**
 		 * Gets the css id.
 		 *
 		 * @return the css id
 		 * @see org.eclipse.osbp.ecview.core.ui.core.model.core.YCssAble#getCssID()
 		 */
 		public String getCssID() {
 			return yField.getCssID();
 		}

 		/**
 		 * Returns true, if the css id is not null and not empty.
 		 *
 		 * @return true, if is css id valid
 		 */
 		public boolean isCssIdValid() {
 			return getCssID() != null && !getCssID().equals("");
 		}

 		/**
 		 * Returns the label.
 		 *
 		 * @return the label
 		 */
 		public String getLabel() {
 			return yField.getDatadescription() != null ? yField.getDatadescription().getLabel() : null;
 		}

 		/**
 		 * Returns the label.
 		 *
 		 * @return the label i18n key
 		 */
 		public String getLabelI18nKey() {
 			return yField.getDatadescription() != null ? yField.getDatadescription().getLabelI18nKey() : null;
 		}
 	}

 	/**
 	 * Converts the string value of the item icon property to
 	 * {@link ThemeResource}.
 	 */
 	@SuppressWarnings("serial")
 	private static class CustomComboBox extends LazyLoadingComboBox {

 		/** The item icon property id. */
 		private Object itemIconPropertyId;

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see
 		 * com.vaadin.ui.AbstractSelect#setItemIconPropertyId(java.lang.Object)
 		 */
 		@Override
 		public void setItemIconPropertyId(Object propertyId) throws IllegalArgumentException {
 			if (propertyId == null) {
 				super.setItemIconPropertyId(propertyId);
 			} else if (!getContainerPropertyIds().contains(propertyId)) {
 				super.setItemIconPropertyId(propertyId);
 			} else if (String.class.isAssignableFrom(getType(propertyId))) {
 				itemIconPropertyId = propertyId;
 			} else {
 				super.setItemIconPropertyId(propertyId);
 			}
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see com.vaadin.ui.AbstractSelect#getItemIconPropertyId()
 		 */
 		public Object getItemIconPropertyId() {
 			return itemIconPropertyId != null ? itemIconPropertyId : super.getItemIconPropertyId();
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see com.vaadin.ui.AbstractSelect#getItemIcon(java.lang.Object)
 		 */
 		public Resource getItemIcon(Object itemId) {
 			if (itemIconPropertyId == null) {
 				return super.getItemIcon(itemId);
 			} else {
 				final Property<?> ip = getContainerProperty(itemId, getItemIconPropertyId());
 				if (ip == null) {
 					return null;
 				}
 				final Object icon = ip.getValue();
 				try {
 					if (icon instanceof String) {
 						return new ThemeResource((String) icon);
 					}
 				} catch (Exception e) {
 					// nothing to do
 				}
 			}
 			return null;
 		}
 	}

 }
	/**
	* 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.runtime.web.ecview.presentation.vaadin.internal;

	import java.util.Locale;

	import org.eclipse.core.databinding.observable.IObservable;
	import org.eclipse.core.databinding.observable.list.IObservableList;
	import org.eclipse.core.databinding.observable.value.IObservableValue;
	import org.eclipse.emf.databinding.EMFProperties;
	import org.eclipse.osbp.ecview.core.common.editpart.IElementEditpart;
	import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableBindingEndpoint;
	import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableCollectionEndpoint;
	import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableSelectionEndpoint;
	import org.eclipse.osbp.ecview.core.databinding.emf.model.ECViewModelBindable;
	import org.eclipse.osbp.ecview.core.extension.model.extension.ExtensionModelPackage;
	import org.eclipse.osbp.ecview.core.extension.model.extension.YComboBox;
	import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.IComboBoxEditpart;
	import org.eclipse.osbp.runtime.common.state.ISharedStateContext;
	import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractFieldWidgetPresenter;
	import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal.util.Util;
	import org.eclipse.osbp.runtime.web.vaadin.common.data.BeanServiceLazyLoadingContainer;
	import org.eclipse.osbp.runtime.web.vaadin.common.data.DeepResolvingBeanItemContainer;
	import org.eclipse.osbp.runtime.web.vaadin.common.data.IBeanSearchServiceFactory;
	import org.eclipse.osbp.runtime.web.vaadin.components.widget.LazyLoadingComboBox;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	import com.vaadin.data.Container;
	import com.vaadin.data.Container.Sortable;
	import com.vaadin.data.Property;
	import com.vaadin.data.util.ObjectProperty;
	import com.vaadin.server.Resource;
	import com.vaadin.server.ThemeResource;
	import com.vaadin.ui.AbstractSelect.ItemCaptionMode;
	import com.vaadin.ui.Component;
	import com.vaadin.ui.ComponentContainer;
	import com.vaadin.ui.Field;

	// TODO: Auto-generated Javadoc
	/**
	* This presenter is responsible to render a combo box on the given layout.
	*/
	@SuppressWarnings("restriction")
	public class ComboBoxPresentation extends AbstractFieldWidgetPresenter<Component> {

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

	/** The model access. */
	private final ModelAccess modelAccess;

	/** The combo. */
	private LazyLoadingComboBox combo;

	/** The property. */
	@SuppressWarnings("rawtypes")
	private ObjectProperty property;

	/**
	* Constructor.
	*
	* @param editpart
	* The editpart of that presenter
	*/
	public ComboBoxPresentation(IElementEditpart editpart) {
	super((IComboBoxEditpart) editpart);
	this.modelAccess = new ModelAccess((YComboBox) editpart.getModel());
	}

	/**
	* {@inheritDoc}
	*/
	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public Component doCreateWidget(Object parent) {
	if (combo == null) {

	combo = new CustomComboBox();
	combo.addStyleName(CSS_CLASS_CONTROL);
	combo.setImmediate(true);
	setupComponent(combo, getCastedModel());

	associateWidget(combo, modelAccess.yField);
	if (modelAccess.isCssIdValid()) {
	combo.setId(modelAccess.getCssID());
	} else {
	combo.setId(getEditpart().getId());
	}

	if (modelAccess.isCssClassValid()) {
	combo.addStyleName(modelAccess.getCssClass());
	}

	try {
	property = new ObjectProperty(null, modelAccess.yField.getModelSelectionType());
	combo.setPropertyDataSource(property);

	if (modelAccess.yField.getType() != null) {
	if (!modelAccess.yField.isUseBeanService()) {
	DeepResolvingBeanItemContainer datasource = new DeepResolvingBeanItemContainer(
	modelAccess.yField.getType());
	combo.setContainerDataSource(datasource);
	} else {
	IBeanSearchServiceFactory factory = getViewContext()
	.getService(IBeanSearchServiceFactory.class.getName());
	if (factory != null) {
	ISharedStateContext sharedState = getViewContext()
	.getService(ISharedStateContext.class.getName());
	BeanServiceLazyLoadingContainer<?> datasource = new BeanServiceLazyLoadingContainer(
	factory.createService(modelAccess.yField.getType()), modelAccess.yField.getType(),
	sharedState);
	combo.setContainerDataSource(datasource);
	}
	}
	}

	String itemCaptionProperty = modelAccess.yField.getCaptionProperty();
	if (itemCaptionProperty != null && !itemCaptionProperty.equals("")) {
	combo.setItemCaptionPropertyId(itemCaptionProperty);
	combo.setItemCaptionMode(ItemCaptionMode.PROPERTY);

	Container container = combo.getContainerDataSource();
	if (container instanceof Container.Sortable) {
	Container.Sortable sortable = (Sortable) container;
	sortable.sort(new Object[] { itemCaptionProperty }, new boolean[] { true });
	}
	} else {
	combo.setItemCaptionMode(ItemCaptionMode.ID);
	}

	String itemImageProperty = modelAccess.yField.getImageProperty();
	if (itemImageProperty != null && !itemImageProperty.equals("")) {
	combo.setItemIconPropertyId(itemImageProperty);
	}

	// creates the binding for the field
	createBindings(modelAccess.yField, combo);

	if (modelAccess.isCssClassValid()) {
	combo.addStyleName(modelAccess.getCssClass());
	}

	applyCaptions();

	initializeField(combo);
	} catch (Exception e) {
	LOGGER.error("{}", e);
	}
	}
	return combo;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.
	* AbstractVaadinWidgetPresenter#doUpdateLocale(java.util.Locale)
	*/
	@Override
	protected void doUpdateLocale(Locale locale) {
	// no need to set the locale to the ui elements. Is handled by vaadin
	// internally.

	// update the captions
	applyCaptions();
	}

	/**
	* Applies the labels to the widgets.
	*/
	protected void applyCaptions() {
	Util.applyCaptions(getI18nService(), modelAccess.getLabel(), modelAccess.getLabelI18nKey(), getLocale(), combo);
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.
	* AbstractFieldWidgetPresenter#doGetField()
	*/
	@Override
	protected Field<?> doGetField() {
	return combo;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.
	* AbstractVaadinWidgetPresenter#internalGetObservableEndpoint(org.eclipse.
	* osbp.ecview.core.common.model.core.YEmbeddableBindingEndpoint)
	*/
	@Override
	protected IObservable internalGetObservableEndpoint(YEmbeddableBindingEndpoint bindableValue) {
	if (bindableValue == null) {
	throw new IllegalArgumentException("BindableValue must not be null!");
	}

	if (bindableValue instanceof YEmbeddableCollectionEndpoint) {
	return internalGetCollectionEndpoint();
	} else if (bindableValue instanceof YEmbeddableSelectionEndpoint) {
	return internalGetSelectionEndpoint((YEmbeddableSelectionEndpoint) bindableValue);
	}
	throw new IllegalArgumentException("Not a valid input: " + bindableValue);
	}

	/**
	* Returns the observable to observe the collection.
	*
	* @return the i observable list
	*/
	protected IObservableList internalGetCollectionEndpoint() {
	// return the observable value for text
	return EMFProperties.list(ExtensionModelPackage.Literals.YCOMBO_BOX__COLLECTION).observe(getModel());
	}

	/**
	* Returns the observable to observe the selection.
	*
	* @param yEndpoint
	* the y endpoint
	* @return the i observable value
	*/
	protected IObservableValue internalGetSelectionEndpoint(YEmbeddableSelectionEndpoint yEndpoint) {

	String attributePath = ECViewModelBindable
	.getAttributePath(ExtensionModelPackage.Literals.YCOMBO_BOX__SELECTION, yEndpoint.getAttributePath());

	// return the observable value for text
	return ECViewModelBindable.observeValue(castEObject(getModel()), attributePath, modelAccess.yField.getType(),
	modelAccess.yField.getEmfNsURI());
	}

	/**
	* Creates the bindings for the given values.
	*
	* @param yField
	* the y field
	* @param field
	* the field
	*/
	protected void createBindings(YComboBox yField, LazyLoadingComboBox field) {

	if (!modelAccess.yField.isUseBeanService()) {
	// create the model binding from ridget to ECView-model
	registerBinding(createBindings_ContainerContents(castEObject(getModel()),
	ExtensionModelPackage.Literals.YCOMBO_BOX__COLLECTION, field, yField.getType()));
	}

	// create the model binding from ridget to ECView-model
	registerBinding(createBindingsSelection(castEObject(getModel()),
	ExtensionModelPackage.Literals.YCOMBO_BOX__SELECTION, field, yField.getModelSelectionType()));

	super.createBindings(yField, field, null);
	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation#
	* getWidget()
	*/
	@Override
	public Component getWidget() {
	return combo;
	}

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

	/**
	* {@inheritDoc}
	*/
	@Override
	public void doUnrender() {
	if (combo != null) {

	// unbind all active bindings
	unbind();

	Component parent = ((Component) combo.getParent());
	if (parent != null && parent instanceof ComponentContainer) {
	((ComponentContainer) parent).removeComponent(combo);
	}

	// remove assocations
	unassociateWidget(combo);

	combo = null;
	}
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected void internalDispose() {
	try {
	unrender();
	} finally {
	super.internalDispose();
	}
	}

	/**
	* A helper class.
	*/
	private static class ModelAccess {

	/** The y field. */
	private final YComboBox yField;

	/**
	* Instantiates a new model access.
	*
	* @param yField
	* the y field
	*/
	public ModelAccess(YComboBox yField) {
	super();
	this.yField = yField;
	}

	/**
	* Gets the css class.
	*
	* @return the css class
	* @see org.eclipse.osbp.ecview.core.ui.core.model.core.YCssAble#getCssClass()
	*/
	public String getCssClass() {
	return yField.getCssClass();
	}

	/**
	* Returns true, if the css class is not null and not empty.
	*
	* @return true, if is css class valid
	*/
	public boolean isCssClassValid() {
	return getCssClass() != null && !getCssClass().equals("");
	}

	/**
	* Gets the css id.
	*
	* @return the css id
	* @see org.eclipse.osbp.ecview.core.ui.core.model.core.YCssAble#getCssID()
	*/
	public String getCssID() {
	return yField.getCssID();
	}

	/**
	* Returns true, if the css id is not null and not empty.
	*
	* @return true, if is css id valid
	*/
	public boolean isCssIdValid() {
	return getCssID() != null && !getCssID().equals("");
	}

	/**
	* Returns the label.
	*
	* @return the label
	*/
	public String getLabel() {
	return yField.getDatadescription() != null ? yField.getDatadescription().getLabel() : null;
	}

	/**
	* Returns the label.
	*
	* @return the label i18n key
	*/
	public String getLabelI18nKey() {
	return yField.getDatadescription() != null ? yField.getDatadescription().getLabelI18nKey() : null;
	}
	}

	/**
	* Converts the string value of the item icon property to
	* {@link ThemeResource}.
	*/
	@SuppressWarnings("serial")
	private static class CustomComboBox extends LazyLoadingComboBox {

	/** The item icon property id. */
	private Object itemIconPropertyId;

	/*
	* (non-Javadoc)
	*
	* @see
	* com.vaadin.ui.AbstractSelect#setItemIconPropertyId(java.lang.Object)
	*/
	@Override
	public void setItemIconPropertyId(Object propertyId) throws IllegalArgumentException {
	if (propertyId == null) {
	super.setItemIconPropertyId(propertyId);
	} else if (!getContainerPropertyIds().contains(propertyId)) {
	super.setItemIconPropertyId(propertyId);
	} else if (String.class.isAssignableFrom(getType(propertyId))) {
	itemIconPropertyId = propertyId;
	} else {
	super.setItemIconPropertyId(propertyId);
	}
	}

	/*
	* (non-Javadoc)
	*
	* @see com.vaadin.ui.AbstractSelect#getItemIconPropertyId()
	*/
	public Object getItemIconPropertyId() {
	return itemIconPropertyId != null ? itemIconPropertyId : super.getItemIconPropertyId();
	}

	/*
	* (non-Javadoc)
	*
	* @see com.vaadin.ui.AbstractSelect#getItemIcon(java.lang.Object)
	*/
	public Resource getItemIcon(Object itemId) {
	if (itemIconPropertyId == null) {
	return super.getItemIcon(itemId);
	} else {
	final Property<?> ip = getContainerProperty(itemId, getItemIconPropertyId());
	if (ip == null) {
	return null;
	}
	final Object icon = ip.getValue();
	try {
	if (icon instanceof String) {
	return new ThemeResource((String) icon);
	}
	} catch (Exception e) {
	// nothing to do
	}
	}
	return null;
	}
	}

	}