Java tutorial
/******************************************************************************* * Copyright (c) 2013-2014 Red Hat, Inc. * All rights reserved. * This program is 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: * Red Hat, Inc. - initial API and implementation ******************************************************************************/ package org.switchyard.tools.ui.editor.components.binding.sca; import org.eclipse.core.databinding.DataBindingContext; import org.eclipse.core.databinding.UpdateValueStrategy; import org.eclipse.core.databinding.observable.ChangeEvent; import org.eclipse.core.databinding.observable.IChangeListener; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.value.ComputedValue; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.core.databinding.observable.value.WritableValue; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.Path; import org.eclipse.core.runtime.Status; import org.eclipse.emf.ecore.EObject; import org.eclipse.emf.ecore.resource.Resource; import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain; import org.eclipse.emf.edit.domain.EditingDomain; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jdt.core.IType; import org.eclipse.jdt.core.JavaCore; import org.eclipse.jdt.core.JavaModelException; import org.eclipse.jdt.core.search.IJavaSearchScope; import org.eclipse.jdt.core.search.SearchEngine; import org.eclipse.jdt.ui.IJavaElementSearchConstants; import org.eclipse.jdt.ui.JavaUI; import org.eclipse.jface.databinding.fieldassist.ControlDecorationSupport; import org.eclipse.jface.databinding.swt.SWTObservables; import org.eclipse.jface.databinding.viewers.ViewersObservables; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ComboViewer; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.soa.sca.sca1_1.model.sca.Binding; import org.eclipse.soa.sca.sca1_1.model.sca.SCABinding; import org.eclipse.soa.sca.sca1_1.model.sca.ScaPackage; import org.eclipse.soa.sca.sca1_1.model.sca.Service; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.dialogs.SelectionDialog; import org.eclipse.ui.forms.widgets.FormToolkit; import org.switchyard.tools.models.switchyard1_0.camel.jms.CamelJmsBindingType; import org.switchyard.tools.models.switchyard1_0.switchyard.SwitchyardPackage; import org.switchyard.tools.ui.editor.Messages; import org.switchyard.tools.ui.editor.databinding.EMFUpdateValueStrategyNullForEmptyString; import org.switchyard.tools.ui.editor.databinding.ObservablesUtil; import org.switchyard.tools.ui.editor.databinding.SWTValueUpdater; import org.switchyard.tools.ui.editor.databinding.StringEmptyValidator; import org.switchyard.tools.ui.editor.diagram.binding.AbstractSYBindingComposite; import org.switchyard.tools.ui.editor.model.merge.MergedModelUtil; /** * @author bfitzpat * */ public class BindingSCAComposite extends AbstractSYBindingComposite { private Composite _panel; private SCABinding _binding = null; private Text _nameText; private Button _clusteredCheckbox; private ComboViewer _loadBalancingCombo; private Text _loadBalancingCustomClassText; private Button _browseLoadBalancingClassButton; private Text _targetServiceText; private Text _targetNamespaceText; private boolean _showConsumer; private IJavaProject _project; private WritableValue _bindingValue; BindingSCAComposite(FormToolkit toolkit) { super(toolkit); } @Override public String getTitle() { return Messages.title_scaBindingDetails; } @Override public String getDescription() { return Messages.description_scaBindingDetails; } @Override public void setBinding(Binding impl) { super.setBinding(impl); if (impl instanceof SCABinding) { this._binding = (SCABinding) impl; _bindingValue.setValue(_binding); final Resource resource = MergedModelUtil.getSwitchYard((EObject) getTargetObject()).eResource(); if (resource.getURI().isPlatformResource()) { final IFile file = ResourcesPlugin.getWorkspace().getRoot() .getFile(new Path(resource.getURI().toPlatformString(true))); if (file != null) { _project = JavaCore.create(file.getProject()); } } } else { _bindingValue.setValue(null); } } @Override public void setTargetObject(EObject target) { super.setTargetObject(target); if (target instanceof Service) { _showConsumer = true; } } @Override public void createContents(Composite parent, int style, DataBindingContext context) { _panel = getToolkit().createComposite(parent, style); _panel.setLayout(new FillLayout()); getConsumerTabControl(_panel, context); bindControls(context); } private Control getConsumerTabControl(Composite tabFolder, DataBindingContext context) { final FormToolkit toolkit = getToolkit(); Composite composite = toolkit.createComposite(tabFolder, SWT.NONE); GridLayout gl = new GridLayout(2, false); composite.setLayout(gl); _nameText = createLabelAndText(composite, Messages.label_name); if (!_showConsumer) { _targetServiceText = createLabelAndText(composite, Messages.label_targetService); _targetNamespaceText = createLabelAndText(composite, Messages.label_targetNamespace); } Group clusteringGroup = new Group(composite, SWT.NONE); clusteringGroup.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false, 2, 1)); clusteringGroup.setLayout(new GridLayout(3, false)); clusteringGroup.setText(Messages.label_clustering); toolkit.adapt(clusteringGroup); _clusteredCheckbox = createCheckbox(clusteringGroup, Messages.label_clustered); addGridData(_clusteredCheckbox, 3, GridData.FILL_HORIZONTAL); if (!_showConsumer) { _loadBalancingCombo = createLabelAndComboViewer(clusteringGroup, Messages.label_loadBalancing, true); addGridData(_loadBalancingCombo.getCombo(), 2, GridData.FILL_HORIZONTAL); _loadBalancingCombo.setContentProvider(ArrayContentProvider.getInstance()); _loadBalancingCombo.setLabelProvider(new LabelProvider()); String[] authTypes = new String[] { "", "RoundRobinStrategy", "RandomStrategy", Messages.constant_customLoadBalanceStrategy }; _loadBalancingCombo.setInput(authTypes); _loadBalancingCustomClassText = createLabelAndText(clusteringGroup, Messages.label_customClass); _loadBalancingCombo.getCombo().setEnabled(false); _loadBalancingCustomClassText.setEnabled(false); _browseLoadBalancingClassButton = toolkit.createButton(clusteringGroup, Messages.button_browse, SWT.PUSH); GridData btnGD = new GridData(); _browseLoadBalancingClassButton.setLayoutData(btnGD); _browseLoadBalancingClassButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent event) { String newClass = handleBrowse(_loadBalancingCustomClassText.getText()); if (newClass != null) { setTextValueAndNotify(_loadBalancingCustomClassText, newClass, true); } } }); } return composite; } @Override public Composite getPanel() { return this._panel; } protected void handleModify(final Control control) { setHasChanged(false); setDidSomething(true); } protected void handleUndo(Control control) { if (_binding != null) { super.handleUndo(control); } } /** * Must be called prior to creating the control. * * @param showConsumer true to show consumer details; false to show producer * details. */ public void setShowConsumer(boolean showConsumer) { _showConsumer = showConsumer; } private String handleBrowse(String filter) { IJavaSearchScope scope = null; if (_project == null) { scope = SearchEngine.createWorkspaceScope(); } else { scope = SearchEngine.createJavaSearchScope(new IJavaElement[] { _project }); } try { SelectionDialog dialog = JavaUI.createTypeDialog(Display.getCurrent().getActiveShell(), null, scope, IJavaElementSearchConstants.CONSIDER_CLASSES, false, filter.isEmpty() ? "* " : filter); //$NON-NLS-1$ if (dialog.open() == SelectionDialog.OK) { Object[] result = dialog.getResult(); if (result.length > 0 && result[0] instanceof IType) { return ((IType) result[0]).getFullyQualifiedName(); } } } catch (JavaModelException e) { e.printStackTrace(); } return null; } private void bindControls(final DataBindingContext context) { final EditingDomain domain = AdapterFactoryEditingDomain.getEditingDomainFor(getTargetObject()); final Realm realm = SWTObservables.getRealm(_nameText.getDisplay()); _bindingValue = new WritableValue(realm, null, CamelJmsBindingType.class); org.eclipse.core.databinding.Binding binding = context.bindValue( SWTObservables.observeText(_nameText, new int[] { SWT.Modify }), ObservablesUtil.observeDetailValue(domain, _bindingValue, ScaPackage.eINSTANCE.getBinding_Name()), new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT) .setAfterConvertValidator( new StringEmptyValidator("SCA binding name should not be empty.", Status.WARNING)), null); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); /* * we also want to bind the name field to the binding name. note that * the model to target updater is configured to NEVER update. we want * the camel binding name to be the definitive source for this field. */ binding = context.bindValue(SWTObservables.observeText(_nameText, new int[] { SWT.Modify }), ObservablesUtil.observeDetailValue(domain, _bindingValue, ScaPackage.eINSTANCE.getBinding_Name()), new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT) .setAfterConvertValidator( new StringEmptyValidator("SCA binding name should not be empty.", Status.WARNING)), new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER)); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); final IObservableValue clusteredValue = ObservablesUtil.observeDetailValue(domain, _bindingValue, SwitchyardPackage.eINSTANCE.getDocumentRoot_Clustered()); binding = context.bindValue(SWTObservables.observeSelection(_clusteredCheckbox), clusteredValue, new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT), null); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); if (!_showConsumer) { final IObservableValue loadBalanceValue = new WritableValue(realm, null, String.class); final IObservableValue loadBalanceCustomValue = new WritableValue(realm, null, String.class); clusteredValue.addChangeListener(new IChangeListener() { @Override public void handleChange(ChangeEvent event) { boolean isClustered = ((Boolean) clusteredValue.getValue()).booleanValue(); _loadBalancingCombo.getControl().setEnabled(isClustered); String value = (String) loadBalanceValue.getValue(); if (!isClustered && value != null) { loadBalanceValue.setValue(null); } } }); loadBalanceValue.addChangeListener(new IChangeListener() { @Override public void handleChange(ChangeEvent event) { String value = (String) loadBalanceValue.getValue(); boolean isCustom = false; if (value != null) { isCustom = value.equals(Messages.constant_customLoadBalanceStrategy); } _loadBalancingCustomClassText.setEnabled(isCustom); _browseLoadBalancingClassButton.setEnabled(isCustom); if (!isCustom) { loadBalanceCustomValue.setValue(null); } } }); binding = context.bindValue(SWTObservables.observeText(_targetServiceText, new int[] { SWT.Modify }), ObservablesUtil.observeDetailValue(domain, _bindingValue, SwitchyardPackage.eINSTANCE.getDocumentRoot_Target()), new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT), null); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); binding = context.bindValue(SWTObservables.observeText(_targetNamespaceText, new int[] { SWT.Modify }), ObservablesUtil.observeDetailValue(domain, _bindingValue, SwitchyardPackage.eINSTANCE.getDocumentRoot_TargetNamespace()), new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT), null); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); binding = context.bindValue(ViewersObservables.observeSingleSelection(_loadBalancingCombo), loadBalanceValue, new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT), null); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); binding = context.bindValue(SWTObservables.observeText(_loadBalancingCustomClassText, SWT.Modify), loadBalanceCustomValue, new EMFUpdateValueStrategyNullForEmptyString(null, UpdateValueStrategy.POLICY_CONVERT), null); ControlDecorationSupport.create(SWTValueUpdater.attach(binding), SWT.TOP | SWT.LEFT); ComputedValue computedLoadBalanceValue = new ComputedValue() { @Override protected Object calculate() { final String loadBalance = (String) loadBalanceValue.getValue(); final String customLoadBalance = (String) loadBalanceCustomValue.getValue(); if (loadBalance != null && loadBalance.equalsIgnoreCase(Messages.constant_customLoadBalanceStrategy) && customLoadBalance != null) { return customLoadBalance; } else if (loadBalance != null && !loadBalance.equalsIgnoreCase(Messages.constant_customLoadBalanceStrategy)) { loadBalanceCustomValue.setValue(null); return loadBalance; } return null; } protected void doSetValue(Object value) { final String strValue = (String) value; //"RoundRobinStrategy", "RandomStrategy" if (strValue != null && !strValue.equalsIgnoreCase("RoundRobinStrategy") && !strValue.equalsIgnoreCase("RandomStrategy")) { loadBalanceValue.setValue(Messages.constant_customLoadBalanceStrategy); loadBalanceCustomValue.setValue(strValue); } else if (strValue != null) { loadBalanceValue.setValue(strValue); loadBalanceCustomValue.setValue(null); setTextValueAndNotify(_loadBalancingCustomClassText, "", false); } else { loadBalanceValue.setValue(null); loadBalanceCustomValue.setValue(null); } getValue(); } }; // now bind the proxy into the binding binding = context.bindValue(computedLoadBalanceValue, ObservablesUtil.observeDetailValue(domain, _bindingValue, SwitchyardPackage.eINSTANCE.getDocumentRoot_LoadBalance())); } } }