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.source; import java.io.File; import java.io.InputStream; import java.net.URI; import java.util.Collection; import java.util.HashSet; import java.util.Set; import org.eclipse.core.runtime.content.IContentType; import org.eclipse.jface.dialogs.DialogPage; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.jface.preference.FileFieldEditor; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.jface.viewers.ComboViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; 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.Label; import org.eclipse.ui.PlatformUI; import eu.esdihumboldt.hale.common.core.io.HaleIO; import eu.esdihumboldt.hale.common.core.io.IOProvider; import eu.esdihumboldt.hale.common.core.io.ImportProvider; import eu.esdihumboldt.hale.common.core.io.extension.IOProviderDescriptor; import eu.esdihumboldt.hale.common.core.io.supplier.FileIOSupplier; import eu.esdihumboldt.hale.common.core.io.supplier.LocatableInputSupplier; import eu.esdihumboldt.hale.ui.io.ImportSource; import eu.esdihumboldt.hale.ui.service.project.ProjectService; import eu.esdihumboldt.util.io.IOUtils; /** * File import source * * @param <P> the supported {@link IOProvider} type * * @author Simon Templer * @since 2.5 */ public class FileSource<P extends ImportProvider> extends AbstractProviderSource<P> { /** * The file field editor for the source file */ private FileSourceFileFieldEditor sourceFile; /** * The set of supported content types */ private Set<IContentType> supportedTypes; private URI projectLocation; /** * @see ImportSource#createControls(Composite) */ @Override public void createControls(Composite parent) { parent.setLayout(new GridLayout(4, false)); ProjectService ps = (ProjectService) PlatformUI.getWorkbench().getService(ProjectService.class); projectLocation = ps.getLoadLocation() == null ? null : ps.getLoadLocation(); boolean projectLocAvailable = projectLocation != null && "file".equals(projectLocation.getScheme()); // source file sourceFile = new FileSourceFileFieldEditor("sourceFile", "Source file:", FileFieldEditor.VALIDATE_ON_KEY_STROKE, parent, projectLocation); sourceFile.setEmptyStringAllowed(false); sourceFile.setPage(getPage()); // set content types for file field Collection<IOProviderDescriptor> factories = getConfiguration().getFactories(); supportedTypes = new HashSet<IContentType>(); for (IOProviderDescriptor factory : factories) { supportedTypes.addAll(factory.getSupportedTypes()); } sourceFile.setContentTypes(supportedTypes); sourceFile.setPropertyChangeListener(new IPropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent event) { if (event.getProperty().equals(FieldEditor.IS_VALID)) { updateState(true); } else if (event.getProperty().equals(FieldEditor.VALUE)) { updateState(true); } } }); // provider selection // label Label providerLabel = new Label(parent, SWT.NONE); providerLabel.setText("Import as"); // create provider combo ComboViewer providers = createProviders(parent); providers.getControl().setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false, 3, 1)); final Button relativeCheck = new Button(parent, SWT.CHECK); String text = "Use relative paths if possible."; relativeCheck.setText("Use relative paths if possible."); relativeCheck.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { sourceFile.setUseRelativeIfPossible(relativeCheck.getSelection()); } }); if (!projectLocAvailable) { relativeCheck.setEnabled(false); text += " Only available once the project is saved to a file."; } relativeCheck.setText(text); relativeCheck.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false, 4, 1)); // initial state update updateState(true); } /** * @see AbstractProviderSource#updateContentType() */ @Override protected void updateContentType() { IContentType contentType = null; if (sourceFile.isValid()) { // determine content type Collection<IContentType> filteredTypes = HaleIO.findContentTypesFor(supportedTypes, getSource(), sourceFile.getStringValue()); if (!filteredTypes.isEmpty()) { contentType = filteredTypes.iterator().next(); } } getConfiguration().setContentType(contentType); if (contentType != null) { getPage().setMessage(contentType.getName(), DialogPage.INFORMATION); } else { getPage().setMessage(null); } super.updateContentType(); } /** * @see AbstractProviderSource#isValidSource() */ @Override protected boolean isValidSource() { return sourceFile.isValid(); } /** * @see AbstractProviderSource#getSource() */ @Override protected LocatableInputSupplier<? extends InputStream> getSource() { File file = new File(sourceFile.getStringValue()); if (file.isAbsolute()) return new FileIOSupplier(file); else { URI relativeURI = IOUtils.relativeFileToURI(file); File absoluteFile = new File(projectLocation.resolve(relativeURI)); return new FileIOSupplier(absoluteFile, relativeURI); } } /** * @see AbstractSource#onActivate() */ @Override public void onActivate() { sourceFile.setFocus(); } }