org.eclipse.osbp.runtime.web.ecview.presentation.vaadin/src/org/eclipse/osbp/runtime/web/ecview/presentation/vaadin/internal/MasterDetailPresentation.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 v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *         Florian Pirchner - Initial implementation
  */
 package org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal;

 import java.net.URI;
 import java.util.Locale;

 import org.eclipse.core.databinding.Binding;
 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.binding.observables.ContextObservables;
 import org.eclipse.osbp.ecview.core.common.editpart.IElementEditpart;
 import org.eclipse.osbp.ecview.core.common.model.core.YCollectionBindable;
 import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddable;
 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.common.presentation.IWidgetPresentation;
 import org.eclipse.osbp.ecview.core.common.uri.URIHelper;
 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.YMasterDetail;
 import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.IMasterDetailEditpart;
 import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation;
 import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.IConstants;
 import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractVaadinWidgetPresenter;
 import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal.util.Util;

 import com.vaadin.ui.Component;
 import com.vaadin.ui.ComponentContainer;
 import com.vaadin.ui.CssLayout;
 import com.vaadin.ui.VerticalLayout;

 // TODO: Auto-generated Javadoc
 /**
  * This presenter is responsible to render a text field on the given layout.
  */
 @SuppressWarnings("restriction")
 public class MasterDetailPresentation extends
 		AbstractVaadinWidgetPresenter<ComponentContainer> implements
 		IMasterDetailPresentation<ComponentContainer> {

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

 	/** The component base. */
 	private VerticalLayout componentBase;

 	/** The master base. */
 	private CssLayout masterBase;

 	/** The detail base. */
 	private CssLayout detailBase;

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

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

 	/** The master collection binding. */
 	private Binding masterCollectionBinding;

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

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public ComponentContainer doCreateWidget(Object parent) {
 		if (componentBase == null) {
 			componentBase = new VerticalLayout();
 			componentBase.addStyleName(CSS_CLASS_CONTROL_BASE);
 			if (modelAccess.isCssIdValid()) {
 				componentBase.setId(modelAccess.getCssID());
 			} else {
 				componentBase.setId(getEditpart().getId());
 			}

 			associateWidget(componentBase, modelAccess.yField);

 			// create the container for master an detail
 			masterBase = new CssLayout();
 			masterBase.setStyleName(IConstants.CSS_CLASS_MASTER_BASE);
 			masterBase.setSizeFull();
 			componentBase.addComponent(masterBase);

 			associateWidget(masterBase, modelAccess.yField);

 			detailBase = new CssLayout();
 			masterBase.setStyleName(IConstants.CSS_CLASS_DETAIL_BASE);
 			detailBase.setSizeFull();
 			componentBase.addComponent(detailBase);

 			associateWidget(detailBase, modelAccess.yField);

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

 			// render master an detail
 			if (masterPresentation != null) {
 				createMasterWidget();
 			}

 			if (detailPresentation != null) {
 				Component detailWidget = (Component) detailPresentation
 						.createWidget(detailBase);
 				if (detailWidget != null) {
 					detailBase.removeAllComponents();
 					detailBase.addComponent(detailWidget);
 				}
 			}

 		}
 		return componentBase;
 	}

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

 		// create the model binding from ECView-Model to the collection bean
 		// slot
 		URI uri = URIHelper.view().bean(getCollectionBeanSlot())
 				.fragment("value").toURI();
 		IObservableList targetObservableList = ContextObservables.observeList(
 				getViewContext(), uri, modelAccess.yField.getType());
 		IObservableList modelObservable = EMFProperties.list(
 				ExtensionModelPackage.Literals.YMASTER_DETAIL__COLLECTION)
 				.observe(getModel());
 		registerBinding(createBindings(targetObservableList, modelObservable));

 	}

 	/**
 	 * Creates a bean slot that is the input for the detail fields. It is used
 	 * by the presentation to bind the detail fields to that slot.
 	 *
 	 * @return the selection bean slot
 	 */
 	protected String getSelectionBeanSlot() {
 		return "selection_" + getEditpart().getId();
 	}

 	/**
 	 * Create a bean slot which is the input for the master detail. It is used
 	 * by the presentation to bind the table, list,... to that slot.
 	 *
 	 * @return the collection bean slot
 	 */
 	protected String getCollectionBeanSlot() {
 		return "input_" + getEditpart().getId();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractVaadinWidgetPresenter#doUpdateLocale(java.util.Locale)
 	 */
 	@Override
 	protected void doUpdateLocale(Locale locale) {

 		// update the captions
 		applyCaptions();
 	}

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

 	/* (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 NullPointerException("BindableValue must not be null!");
 		}

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

 	/**
 	 * Returns the observable to observe value.
 	 *
 	 * @return the i observable list
 	 */
 	protected IObservableList internalGetCollectionEndpoint() {
 		// delegate the binding to the proper bean slot
 		URI uri = URIHelper.view().bean(getCollectionBeanSlot()).toURI();
 		IObservableList modelObservableList = ContextObservables.observeList(
 				getViewContext(), uri, modelAccess.yField.getType());
 		return modelObservableList;
 	}

 	/**
 	 * 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.YMASTER_DETAIL__SELECTION,
 				yEndpoint.getAttributePath());

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

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

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

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

 			// unbind all active bindings
 			unbind();

 			ComponentContainer parent = ((ComponentContainer) componentBase
 					.getParent());
 			if (parent != null) {
 				parent.removeComponent(componentBase);
 			}

 			// remove assocations
 			unassociateWidget(componentBase);

 			componentBase = null;

 			if (masterPresentation != null) {
 				disposeMasterWidget();
 			}

 			if (detailPresentation != null) {
 				detailPresentation.unrender();
 				detailBase.removeAllComponents();
 			}
 		}
 	}

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

 			// do NOT dispose. Will be handled by editpart.
 			masterPresentation = null;
 			detailPresentation = null;

 		} finally {
 			super.internalDispose();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#getMaster()
 	 */
 	@Override
 	public IWidgetPresentation<?> getMaster() {
 		return masterPresentation;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#getDetail()
 	 */
 	@Override
 	public IWidgetPresentation<?> getDetail() {
 		return detailPresentation;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#setMaster(org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation)
 	 */
 	@Override
 	public void setMaster(IWidgetPresentation<?> master) {
 		if (this.masterPresentation == master) {
 			return;
 		}

 		if (this.masterPresentation != null) {
 			disposeMasterWidget();
 		}

 		this.masterPresentation = master;

 		if (isRendered()) {
 			if (this.masterPresentation != null) {
 				createMasterWidget();
 			}
 		}
 	}

 	/**
 	 * Creates the master widget and does the databinding.
 	 */
 	public void createMasterWidget() {

 		Component masterWidget = (Component) masterPresentation
 				.createWidget(masterBase);
 		if (masterWidget != null) {
 			masterBase.removeAllComponents();
 			masterBase.addComponent(masterWidget);
 		}

 		YEmbeddable yMaster = (YEmbeddable) masterPresentation.getModel();
 		if (yMaster instanceof YCollectionBindable) {
 			createMasterCollectionBinding((YCollectionBindable) yMaster);
 		}
 	}

 	/**
 	 * Disposes the master widget and removes active bindings.
 	 */
 	protected void disposeMasterWidget() {
 		masterPresentation.dispose();
 		masterBase.removeAllComponents();

 		if (masterCollectionBinding != null) {
 			masterCollectionBinding.dispose();
 			masterCollectionBinding = null;
 		}
 	}

 	/**
 	 * Creates a binding from the master element to the proper bean slot.
 	 *
 	 * @param yMasterCollectionBindable
 	 *            the y master collection bindable
 	 */
 	protected void createMasterCollectionBinding(
 			YCollectionBindable yMasterCollectionBindable) {

 		YEmbeddableCollectionEndpoint yMasterEndpoint = yMasterCollectionBindable
 				.createCollectionEndpoint();
 		IObservableList targetObservableList = (IObservableList) this.masterPresentation
 				.getObservableValue(yMasterEndpoint);
 		URI uri = URIHelper.view().bean(getCollectionBeanSlot())
 				.fragment("value").toURI();
 		IObservableList modelObservableList = ContextObservables.observeList(
 				getViewContext(), uri, modelAccess.yField.getType());

 		masterCollectionBinding = createBindings(targetObservableList,
 				modelObservableList);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#setDetail(org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation)
 	 */
 	@Override
 	public void setDetail(IWidgetPresentation<?> detail) {
 		if (this.detailPresentation == detail) {
 			return;
 		}

 		if (this.detailPresentation != null) {
 			this.detailPresentation.dispose();
 			detailBase.removeAllComponents();
 		}

 		this.detailPresentation = detail;

 		if (isRendered()) {
 			if (this.detailPresentation != null) {
 				this.detailPresentation.createWidget(detailBase);
 			}
 		}
 	}

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

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

 		/**
 		 * Instantiates a new model access.
 		 *
 		 * @param yField
 		 *            the y field
 		 */
 		public ModelAccess(YMasterDetail 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
 		 */
 		@SuppressWarnings("unused")
 		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;
 		}
 	}
 }
	/**
	* 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 v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* Florian Pirchner - Initial implementation
	*/
	package org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal;

	import java.net.URI;
	import java.util.Locale;

	import org.eclipse.core.databinding.Binding;
	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.binding.observables.ContextObservables;
	import org.eclipse.osbp.ecview.core.common.editpart.IElementEditpart;
	import org.eclipse.osbp.ecview.core.common.model.core.YCollectionBindable;
	import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddable;
	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.common.presentation.IWidgetPresentation;
	import org.eclipse.osbp.ecview.core.common.uri.URIHelper;
	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.YMasterDetail;
	import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.IMasterDetailEditpart;
	import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation;
	import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.IConstants;
	import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractVaadinWidgetPresenter;
	import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal.util.Util;

	import com.vaadin.ui.Component;
	import com.vaadin.ui.ComponentContainer;
	import com.vaadin.ui.CssLayout;
	import com.vaadin.ui.VerticalLayout;

	// TODO: Auto-generated Javadoc
	/**
	* This presenter is responsible to render a text field on the given layout.
	*/
	@SuppressWarnings("restriction")
	public class MasterDetailPresentation extends
	AbstractVaadinWidgetPresenter<ComponentContainer> implements
	IMasterDetailPresentation<ComponentContainer> {

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

	/** The component base. */
	private VerticalLayout componentBase;

	/** The master base. */
	private CssLayout masterBase;

	/** The detail base. */
	private CssLayout detailBase;

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

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

	/** The master collection binding. */
	private Binding masterCollectionBinding;

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

	/**
	* {@inheritDoc}
	*/
	@Override
	public ComponentContainer doCreateWidget(Object parent) {
	if (componentBase == null) {
	componentBase = new VerticalLayout();
	componentBase.addStyleName(CSS_CLASS_CONTROL_BASE);
	if (modelAccess.isCssIdValid()) {
	componentBase.setId(modelAccess.getCssID());
	} else {
	componentBase.setId(getEditpart().getId());
	}

	associateWidget(componentBase, modelAccess.yField);

	// create the container for master an detail
	masterBase = new CssLayout();
	masterBase.setStyleName(IConstants.CSS_CLASS_MASTER_BASE);
	masterBase.setSizeFull();
	componentBase.addComponent(masterBase);

	associateWidget(masterBase, modelAccess.yField);

	detailBase = new CssLayout();
	masterBase.setStyleName(IConstants.CSS_CLASS_DETAIL_BASE);
	detailBase.setSizeFull();
	componentBase.addComponent(detailBase);

	associateWidget(detailBase, modelAccess.yField);

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

	// render master an detail
	if (masterPresentation != null) {
	createMasterWidget();
	}

	if (detailPresentation != null) {
	Component detailWidget = (Component) detailPresentation
	.createWidget(detailBase);
	if (detailWidget != null) {
	detailBase.removeAllComponents();
	detailBase.addComponent(detailWidget);
	}
	}

	}
	return componentBase;
	}

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

	// create the model binding from ECView-Model to the collection bean
	// slot
	URI uri = URIHelper.view().bean(getCollectionBeanSlot())
	.fragment("value").toURI();
	IObservableList targetObservableList = ContextObservables.observeList(
	getViewContext(), uri, modelAccess.yField.getType());
	IObservableList modelObservable = EMFProperties.list(
	ExtensionModelPackage.Literals.YMASTER_DETAIL__COLLECTION)
	.observe(getModel());
	registerBinding(createBindings(targetObservableList, modelObservable));

	}

	/**
	* Creates a bean slot that is the input for the detail fields. It is used
	* by the presentation to bind the detail fields to that slot.
	*
	* @return the selection bean slot
	*/
	protected String getSelectionBeanSlot() {
	return "selection_" + getEditpart().getId();
	}

	/**
	* Create a bean slot which is the input for the master detail. It is used
	* by the presentation to bind the table, list,... to that slot.
	*
	* @return the collection bean slot
	*/
	protected String getCollectionBeanSlot() {
	return "input_" + getEditpart().getId();
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractVaadinWidgetPresenter#doUpdateLocale(java.util.Locale)
	*/
	@Override
	protected void doUpdateLocale(Locale locale) {

	// update the captions
	applyCaptions();
	}

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

	/* (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 NullPointerException("BindableValue must not be null!");
	}

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

	/**
	* Returns the observable to observe value.
	*
	* @return the i observable list
	*/
	protected IObservableList internalGetCollectionEndpoint() {
	// delegate the binding to the proper bean slot
	URI uri = URIHelper.view().bean(getCollectionBeanSlot()).toURI();
	IObservableList modelObservableList = ContextObservables.observeList(
	getViewContext(), uri, modelAccess.yField.getType());
	return modelObservableList;
	}

	/**
	* 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.YMASTER_DETAIL__SELECTION,
	yEndpoint.getAttributePath());

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

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

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

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

	// unbind all active bindings
	unbind();

	ComponentContainer parent = ((ComponentContainer) componentBase
	.getParent());
	if (parent != null) {
	parent.removeComponent(componentBase);
	}

	// remove assocations
	unassociateWidget(componentBase);

	componentBase = null;

	if (masterPresentation != null) {
	disposeMasterWidget();
	}

	if (detailPresentation != null) {
	detailPresentation.unrender();
	detailBase.removeAllComponents();
	}
	}
	}

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

	// do NOT dispose. Will be handled by editpart.
	masterPresentation = null;
	detailPresentation = null;

	} finally {
	super.internalDispose();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#getMaster()
	*/
	@Override
	public IWidgetPresentation<?> getMaster() {
	return masterPresentation;
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#getDetail()
	*/
	@Override
	public IWidgetPresentation<?> getDetail() {
	return detailPresentation;
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#setMaster(org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation)
	*/
	@Override
	public void setMaster(IWidgetPresentation<?> master) {
	if (this.masterPresentation == master) {
	return;
	}

	if (this.masterPresentation != null) {
	disposeMasterWidget();
	}

	this.masterPresentation = master;

	if (isRendered()) {
	if (this.masterPresentation != null) {
	createMasterWidget();
	}
	}
	}

	/**
	* Creates the master widget and does the databinding.
	*/
	public void createMasterWidget() {

	Component masterWidget = (Component) masterPresentation
	.createWidget(masterBase);
	if (masterWidget != null) {
	masterBase.removeAllComponents();
	masterBase.addComponent(masterWidget);
	}

	YEmbeddable yMaster = (YEmbeddable) masterPresentation.getModel();
	if (yMaster instanceof YCollectionBindable) {
	createMasterCollectionBinding((YCollectionBindable) yMaster);
	}
	}

	/**
	* Disposes the master widget and removes active bindings.
	*/
	protected void disposeMasterWidget() {
	masterPresentation.dispose();
	masterBase.removeAllComponents();

	if (masterCollectionBinding != null) {
	masterCollectionBinding.dispose();
	masterCollectionBinding = null;
	}
	}

	/**
	* Creates a binding from the master element to the proper bean slot.
	*
	* @param yMasterCollectionBindable
	* the y master collection bindable
	*/
	protected void createMasterCollectionBinding(
	YCollectionBindable yMasterCollectionBindable) {

	YEmbeddableCollectionEndpoint yMasterEndpoint = yMasterCollectionBindable
	.createCollectionEndpoint();
	IObservableList targetObservableList = (IObservableList) this.masterPresentation
	.getObservableValue(yMasterEndpoint);
	URI uri = URIHelper.view().bean(getCollectionBeanSlot())
	.fragment("value").toURI();
	IObservableList modelObservableList = ContextObservables.observeList(
	getViewContext(), uri, modelAccess.yField.getType());

	masterCollectionBinding = createBindings(targetObservableList,
	modelObservableList);
	}

	/* (non-Javadoc)
	* @see org.eclipse.osbp.ecview.core.ui.core.editparts.extension.presentation.IMasterDetailPresentation#setDetail(org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation)
	*/
	@Override
	public void setDetail(IWidgetPresentation<?> detail) {
	if (this.detailPresentation == detail) {
	return;
	}

	if (this.detailPresentation != null) {
	this.detailPresentation.dispose();
	detailBase.removeAllComponents();
	}

	this.detailPresentation = detail;

	if (isRendered()) {
	if (this.detailPresentation != null) {
	this.detailPresentation.createWidget(detailBase);
	}
	}
	}

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

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

	/**
	* Instantiates a new model access.
	*
	* @param yField
	* the y field
	*/
	public ModelAccess(YMasterDetail 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
	*/
	@SuppressWarnings("unused")
	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;
	}
	}
	}