Java tutorial
/* * Copyright (c) 2012 Data Harmonisation Panel * * All rights reserved. This program and the accompanying materials are made * available under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the License, * or (at your option) any later version. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution. If not, see <http://www.gnu.org/licenses/>. * * Contributors: * HUMBOLDT EU Integrated Project #030962 * Data Harmonisation Panel <http://www.dhpanel.eu> */ package eu.esdihumboldt.hale.ui.io.instance; import java.text.MessageFormat; import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.eclipse.core.runtime.content.IContentType; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ComboViewer; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import eu.esdihumboldt.hale.common.core.io.HaleIO; import eu.esdihumboldt.hale.common.core.io.extension.IOProviderDescriptor; import eu.esdihumboldt.hale.common.instance.io.InstanceValidator; import eu.esdihumboldt.hale.common.instance.io.InstanceWriter; import eu.esdihumboldt.hale.ui.HaleWizardPage; import eu.esdihumboldt.hale.ui.io.ExportSelectTargetPage; import eu.esdihumboldt.hale.ui.io.IOWizardListener; /** * Wizard page that allows selecting a target instance file and a corresponding * validator * * @author Simon Templer * @partner 01 / Fraunhofer Institute for Computer Graphics Research */ public class InstanceSelectTargetPage extends ExportSelectTargetPage<InstanceWriter, InstanceExportWizard> implements IOWizardListener<InstanceWriter, InstanceExportWizard> { private ComboViewer validators; /** * @see ExportSelectTargetPage#createContent(Composite) */ @Override protected void createContent(Composite page) { super.createContent(page); // page has a 3-column grid layout Group validatorGroup = new Group(page, SWT.NONE); validatorGroup.setText("Validation"); validatorGroup.setLayoutData(GridDataFactory.swtDefaults().align(SWT.FILL, SWT.BEGINNING).grab(true, false) .span(3, 1).indent(8, 10).create()); validatorGroup.setLayout(GridLayoutFactory.swtDefaults().numColumns(1).margins(10, 8).create()); Label vabel = new Label(validatorGroup, SWT.NONE); vabel.setText("Please select a validator if you want to validate the exported file"); vabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false)); validators = new ComboViewer(validatorGroup, SWT.DROP_DOWN | SWT.READ_ONLY); validators.getControl().setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false)); validators.setContentProvider(ArrayContentProvider.getInstance()); validators.setLabelProvider(new LabelProvider() { @Override public String getText(Object element) { if (element instanceof IOProviderDescriptor) { return ((IOProviderDescriptor) element).getDisplayName(); } return super.getText(element); } }); updateInput(); // process selection changes validators.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { ISelection selection = event.getSelection(); updateWizard(selection); } }); getWizard().addIOWizardListener(this); } /** * Update the input of the validator combo viewer */ private void updateInput() { // remember selection ISelection lastSelection = validators.getSelection(); // populate input List<Object> input = new ArrayList<Object>(); IContentType contentType = getWizard().getContentType(); if (contentType != null) { Collection<IOProviderDescriptor> factories = HaleIO.getProviderFactories(InstanceValidator.class); factories = HaleIO.filterFactories(factories, contentType); if (!factories.isEmpty()) { input.add("No validation"); } input.addAll(factories); } if (input.isEmpty()) { input.add((contentType == null) ? ("Unrecognized content type") : (MessageFormat.format("No validator available for {0}", contentType.getName()))); validators.getControl().setEnabled(false); } else { validators.getControl().setEnabled(true); } validators.setInput(input); ISelection newSelection = new StructuredSelection(input.get(0)); // retain old selection if possible if (!lastSelection.isEmpty() && lastSelection instanceof IStructuredSelection) { Object selected = ((IStructuredSelection) lastSelection).getFirstElement(); if (input.contains(selected)) { newSelection = lastSelection; } } validators.setSelection(newSelection, true); // process current selection ISelection selection = validators.getSelection(); updateWizard(selection); } /** * Update the wizard * * @param selection the current selection */ private void updateWizard(ISelection selection) { if (selection.isEmpty()) { getWizard().setValidatorFactory(null); } else if (selection instanceof IStructuredSelection) { IStructuredSelection sel = (IStructuredSelection) selection; Object element = sel.getFirstElement(); if (element instanceof IOProviderDescriptor) { getWizard().setValidatorFactory((IOProviderDescriptor) element); } else { // element that disables validating getWizard().setValidatorFactory(null); } } } /** * @see ExportSelectTargetPage#onShowPage(boolean) */ @Override protected void onShowPage(boolean firstShow) { super.onShowPage(firstShow); updateInput(); } /** * @see IOWizardListener#contentTypeChanged(IContentType) */ @Override public void contentTypeChanged(IContentType contentType) { updateInput(); } /** * @see IOWizardListener#providerDescriptorChanged(IOProviderDescriptor) */ @Override public void providerDescriptorChanged(IOProviderDescriptor providerFactory) { // do nothing } /** * @see HaleWizardPage#dispose() */ @Override public void dispose() { getWizard().removeIOWizardListener(this); super.dispose(); } }