Java tutorial
/** * Copyright (c) 2011 - 2014, Lunifera GmbH (Gross Enzersdorf), Loetz KG (Heidelberg) * 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.lunifera.runtime.web.ecview.presentation.vaadin.internal; import java.util.HashSet; import java.util.Locale; import java.util.Set; 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.emf.ecp.ecview.common.context.II18nService; import org.eclipse.emf.ecp.ecview.common.editpart.IElementEditpart; import org.eclipse.emf.ecp.ecview.common.model.core.YEmbeddableBindingEndpoint; import org.eclipse.emf.ecp.ecview.common.model.core.YEmbeddableCollectionEndpoint; import org.eclipse.emf.ecp.ecview.common.model.core.YEmbeddableMultiSelectionEndpoint; import org.eclipse.emf.ecp.ecview.common.model.core.YEmbeddableSelectionEndpoint; import org.eclipse.emf.ecp.ecview.databinding.emf.model.ECViewModelBindable; import org.eclipse.emf.ecp.ecview.extension.model.extension.ExtensionModelPackage; import org.eclipse.emf.ecp.ecview.extension.model.extension.YSelectionType; import org.eclipse.emf.ecp.ecview.extension.model.extension.YTree; import org.eclipse.emf.ecp.ecview.ui.core.editparts.extension.ITreeEditpart; import com.vaadin.data.util.ObjectProperty; import com.vaadin.ui.Component; import com.vaadin.ui.ComponentContainer; import com.vaadin.ui.CssLayout; import com.vaadin.ui.Field; import com.vaadin.ui.Tree; /** * This presenter is responsible to render a tree on the given layout. */ public class TreePresentation extends AbstractFieldWidgetPresenter<Component> { private final ModelAccess modelAccess; private CssLayout componentBase; private Tree tree; private ObjectProperty property; /** * Constructor. * * @param editpart * The editpart of that presenter */ public TreePresentation(IElementEditpart editpart) { super((ITreeEditpart) editpart); this.modelAccess = new ModelAccess((YTree) editpart.getModel()); } /** * {@inheritDoc} */ @SuppressWarnings({ "unchecked", "rawtypes" }) @Override public Component doCreateWidget(Object parent) { if (componentBase == null) { componentBase = new CssLayout(); componentBase.addStyleName(CSS_CLASS_CONTROL_BASE); if (modelAccess.isCssIdValid()) { componentBase.setId(modelAccess.getCssID()); } else { componentBase.setId(getEditpart().getId()); } associateWidget(componentBase, modelAccess.yTree); tree = new Tree(); tree.addStyleName(CSS_CLASS_CONTROL); tree.setMultiSelect(modelAccess.yTree.getSelectionType() == YSelectionType.MULTI); tree.setImmediate(true); associateWidget(tree, modelAccess.yTree); if (tree.isMultiSelect()) { property = new ObjectProperty(new HashSet(), Set.class); } else { property = new ObjectProperty(null, modelAccess.yTree.getType()); } tree.setPropertyDataSource(property); // creates the binding for the field createBindings(modelAccess.yTree, tree); componentBase.addComponent(tree); if (modelAccess.isCssClassValid()) { tree.addStyleName(modelAccess.getCssClass()); } applyCaptions(); initializeField(tree); } return componentBase; } @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() { II18nService service = getI18nService(); if (service != null && modelAccess.isLabelI18nKeyValid()) { componentBase.setCaption(service.getValue(modelAccess.getLabelI18nKey(), getLocale())); } else { if (modelAccess.isLabelValid()) { componentBase.setCaption(modelAccess.getLabel()); } } } @Override protected Field<?> doGetField() { return tree; } @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); } else if (bindableValue instanceof YEmbeddableMultiSelectionEndpoint) { return internalGetMultiSelectionEndpoint(); } throw new IllegalArgumentException("Not a valid input: " + bindableValue); } /** * Returns the observable to observe the collection. * * @return */ protected IObservableList internalGetCollectionEndpoint() { // return the observable value for text return EMFProperties.list(ExtensionModelPackage.Literals.YTREE__COLLECTION).observe(getModel()); } /** * Returns the observable to observe the selection. * * @return */ protected IObservableList internalGetMultiSelectionEndpoint() { // return the observable value for text return EMFProperties.list(ExtensionModelPackage.Literals.YTREE__MULTI_SELECTION).observe(getModel()); } /** * Returns the observable to observe the selection. * * @return */ @SuppressWarnings("restriction") protected IObservableValue internalGetSelectionEndpoint(YEmbeddableSelectionEndpoint yEndpoint) { String attributePath = ECViewModelBindable.getAttributePath(ExtensionModelPackage.Literals.YTREE__SELECTION, yEndpoint.getAttributePath()); // return the observable value for text return ECViewModelBindable.observeValue(castEObject(getModel()), attributePath, modelAccess.yTree.getType(), modelAccess.yTree.getEmfNsURI()); } /** * Creates the bindings for the given values. * * @param yField * @param field */ protected void createBindings(YTree yField, Tree field) { // create the model binding from ridget to ECView-model registerBinding(createBindings_ContainerContents(castEObject(getModel()), ExtensionModelPackage.Literals.YTREE__COLLECTION, field, yField.getType())); // create the model binding from ridget to ECView-model if (modelAccess.yTree.getSelectionType() == YSelectionType.MULTI) { // create the model binding from ridget to ECView-model registerBinding(createBindingsMultiSelection(castEObject(getModel()), ExtensionModelPackage.Literals.YTREE__MULTI_SELECTION, field, yField.getType())); } else { // create the model binding from ridget to ECView-model registerBinding(createBindingsSelection(castEObject(getModel()), ExtensionModelPackage.Literals.YTREE__SELECTION, field, yField.getType())); } super.createBindings(yField, field, componentBase); } @Override public Component getWidget() { return componentBase; } @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); unassociateWidget(tree); componentBase = null; tree = null; } } /** * {@inheritDoc} */ @Override protected void internalDispose() { try { unrender(); } finally { super.internalDispose(); } } /** * A helper class. */ private static class ModelAccess { private final YTree yTree; public ModelAccess(YTree yTree) { super(); this.yTree = yTree; } /** * @return * @see org.eclipse.emf.ecp.ecview.ui.core.model.core.YCssAble#getCssClass() */ public String getCssClass() { return yTree.getCssClass(); } /** * Returns true, if the css class is not null and not empty. * * @return */ public boolean isCssClassValid() { return getCssClass() != null && !getCssClass().equals(""); } /** * @return * @see org.eclipse.emf.ecp.ecview.ui.core.model.core.YCssAble#getCssID() */ public String getCssID() { return yTree.getCssID(); } /** * Returns true, if the css id is not null and not empty. * * @return */ public boolean isCssIdValid() { return getCssID() != null && !getCssID().equals(""); } /** * Returns true, if the label is valid. * * @return */ public boolean isLabelValid() { return yTree.getDatadescription() != null && yTree.getDatadescription().getLabel() != null; } /** * Returns the label. * * @return */ public String getLabel() { return yTree.getDatadescription().getLabel(); } /** * Returns true, if the label is valid. * * @return */ public boolean isLabelI18nKeyValid() { return yTree.getDatadescription() != null && yTree.getDatadescription().getLabelI18nKey() != null; } /** * Returns the label. * * @return */ public String getLabelI18nKey() { return yTree.getDatadescription().getLabelI18nKey(); } } }