Java tutorial
/* * Copyright 2010-2011 Amazon Technologies, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://aws.amazon.com/apache2.0 * * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES * OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and * limitations under the License. */ package com.amazonaws.eclipse.elasticbeanstalk.server.ui.configEditor; import java.util.Collection; import org.eclipse.core.databinding.AggregateValidationStatus; import org.eclipse.core.databinding.DataBindingContext; import org.eclipse.core.databinding.observable.ChangeEvent; import org.eclipse.core.databinding.observable.IChangeListener; import org.eclipse.core.databinding.observable.set.WritableSet; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.core.databinding.observable.value.WritableValue; import org.eclipse.core.runtime.IStatus; import org.eclipse.jface.databinding.swt.SWTObservables; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.fieldassist.ControlDecoration; import org.eclipse.jface.fieldassist.FieldDecoration; import org.eclipse.jface.fieldassist.FieldDecorationRegistry; 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.Combo; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import com.amazonaws.eclipse.elasticbeanstalk.server.ui.databinding.ChainValidator; import com.amazonaws.eclipse.elasticbeanstalk.server.ui.databinding.DecorationChangeListener; import com.amazonaws.eclipse.elasticbeanstalk.server.ui.databinding.NotEmptyValidator; import com.amazonaws.eclipse.elasticbeanstalk.server.ui.databinding.NotInListValidator; /** * Simple wizard to export an environment configuration template. */ public class ExportTemplateDialog extends MessageDialog { private String templateName; private Collection<String> existingTemplateNames; private DataBindingContext bindingContext = new DataBindingContext(); private IObservableValue isCreatingNew = new WritableValue(); private IObservableValue newTemplateName = new WritableValue(); private IObservableValue existingTemplateName = new WritableValue(); private IObservableValue templateDescription = new WritableValue(); private AggregateValidationStatus aggregateValidationStatus = new AggregateValidationStatus(bindingContext, AggregateValidationStatus.MAX_SEVERITY); public boolean isCreatingNew() { return (Boolean) isCreatingNew.getValue(); } public String getTemplateDescription() { return (String) templateDescription.getValue(); } public String getTemplateName() { if (isCreatingNew()) { return (String) newTemplateName.getValue(); } else { return (String) existingTemplateName.getValue(); } } public ExportTemplateDialog(Shell parentShell, Collection<String> existingTemplateNames, String defaultTemplateName) { super(parentShell, "Export configuration template", null, "Choose a name and description for your template", MessageDialog.NONE, new String[] { IDialogConstants.OK_LABEL, IDialogConstants.CANCEL_LABEL }, 0); this.templateName = defaultTemplateName; this.existingTemplateNames = existingTemplateNames; } @Override protected Control createCustomArea(Composite parent) { parent.setLayout(new FillLayout()); Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(new GridLayout(2, false)); Group templateNameGroup = new Group(composite, SWT.None); templateNameGroup.setLayout(new GridLayout(2, false)); GridData groupData = new GridData(); groupData.horizontalSpan = 2; templateNameGroup.setLayoutData(groupData); // Update existing template final Button updateExistingRadioButton = new Button(templateNameGroup, SWT.RADIO); updateExistingRadioButton.setText("Update an existing template"); final Combo existingTemplateNamesCombo = new Combo(templateNameGroup, SWT.READ_ONLY); existingTemplateNamesCombo.setEnabled(false); if (existingTemplateNames.isEmpty()) { updateExistingRadioButton.setEnabled(false); } else { existingTemplateNamesCombo .setItems(existingTemplateNames.toArray(new String[existingTemplateNames.size()])); existingTemplateNamesCombo.select(0); } // Create new template -- default option Button createNewRadioButton = new Button(templateNameGroup, SWT.RADIO); createNewRadioButton.setText("Create a new template"); final Text templateNameText = new Text(templateNameGroup, SWT.BORDER); templateNameText.setText(templateName); templateNameText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); updateExistingRadioButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { templateNameText.setEnabled(!updateExistingRadioButton.getSelection()); existingTemplateNamesCombo.setEnabled(updateExistingRadioButton.getSelection()); } }); // Description new Label(composite, SWT.NONE).setText("Template description: "); final Text templateDescriptionText = new Text(composite, SWT.BORDER); templateDescriptionText.setText(""); templateDescriptionText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); // Data binding bindingContext.bindValue(SWTObservables.observeSelection(createNewRadioButton), isCreatingNew); isCreatingNew.setValue(true); bindingContext.bindValue(SWTObservables.observeSelection(existingTemplateNamesCombo), existingTemplateName) .updateTargetToModel(); bindingContext.bindValue(SWTObservables.observeText(templateNameText, SWT.Modify), newTemplateName); bindingContext.bindValue(SWTObservables.observeText(templateDescriptionText, SWT.Modify), templateDescription); WritableSet inUseNames = new WritableSet(); inUseNames.addAll(existingTemplateNames); ChainValidator<String> validator = new ChainValidator<String>(newTemplateName, isCreatingNew, new NotEmptyValidator("Template name cannot be empty"), new NotInListValidator<String>(inUseNames, "Template name already in use")); bindingContext.addValidationStatusProvider(validator); // Decorate the new name field with error status ControlDecoration decoration = new ControlDecoration(templateNameText, SWT.TOP | SWT.LEFT); decoration.setDescriptionText("Invalid value"); FieldDecoration fieldDecoration = FieldDecorationRegistry.getDefault() .getFieldDecoration(FieldDecorationRegistry.DEC_ERROR); decoration.setImage(fieldDecoration.getImage()); new DecorationChangeListener(decoration, validator.getValidationStatus()); return composite; } /** * We need to add our button enabling listener here, because they haven't * been created yet in createCustomArea */ @Override protected void createButtonsForButtonBar(Composite parent) { super.createButtonsForButtonBar(parent); aggregateValidationStatus.addChangeListener(new IChangeListener() { public void handleChange(ChangeEvent event) { Object value = aggregateValidationStatus.getValue(); if (value instanceof IStatus == false) return; IStatus status = (IStatus) value; Button okButton = getButton(0); if (okButton != null) { if (status.getSeverity() == IStatus.OK) { okButton.setEnabled(true); } else { okButton.setEnabled(false); } } } }); getButton(0).setEnabled(false); } }