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.style.editors; import java.io.File; import java.net.MalformedURLException; import java.net.URL; import java.util.Arrays; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import javax.imageio.ImageIO; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.text.Document; import org.eclipse.jface.text.TextViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; 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.FileDialog; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; import org.geotools.styling.Graphic; import org.geotools.styling.PointSymbolizer; import org.geotools.styling.StyleBuilder; import de.fhg.igd.slf4jplus.ALogger; import de.fhg.igd.slf4jplus.ALoggerFactory; import eu.esdihumboldt.hale.ui.style.internal.Messages; /** * Editor for external {@link Graphic}. * * Doesn't support editing of an existing symbolizer. * * @author Sebastian Reinhardt * @partner 01 / Fraunhofer Institute for Computer Graphics Research */ public class PointGraphicEditor implements Editor<PointSymbolizer> { private static final StyleBuilder styleBuilder = new StyleBuilder(); private final Composite page; private FileDialog fd; private final TextViewer path; private final Button dialogButton; private final boolean changed = false; private URL chosenFile; private final Text supportText; private static final ALogger log = ALoggerFactory.getLogger(PointGraphicEditor.class); /** * Creates a {@link Graphic} editor * * @param parent the parent composite */ public PointGraphicEditor(Composite parent) { page = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(2, false); page.setLayout(layout); Label graphLabel = new Label(page, SWT.NONE); graphLabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false)); graphLabel.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT)); graphLabel.setText(Messages.PointGraphicEditor_UrlTextField); path = new TextViewer(page, SWT.SINGLE | SWT.BORDER); path.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false)); path.setDocument(new Document()); dialogButton = new Button(page, SWT.PUSH); dialogButton.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false, 2, 1)); dialogButton.setText(Messages.PointGraphicEditor_FileDialogButton); dialogButton.addSelectionListener(new SelectionListener() { @Override public void widgetSelected(SelectionEvent e) { openFileDialog(); } @Override public void widgetDefaultSelected(SelectionEvent e) { // ignore } }); Label supportLabel = new Label(page, SWT.NONE); supportLabel.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false, 2, 1)); supportLabel.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT)); supportLabel.setText("\n" + Messages.PointGraphicEditor_SupportedTypes); supportText = new Text(page, SWT.SINGLE | SWT.BORDER | SWT.READ_ONLY); supportText.setLayoutData(new GridData(SWT.BOTTOM, SWT.CENTER, false, false, 2, 1)); supportText.setText(new HashSet<String>(Arrays.asList(ImageIO.getReaderMIMETypes())).toString()); } /** * Opens a filedialog for the user to select a file and saves its path in a * field */ private void openFileDialog() { fd = new FileDialog(Display.getCurrent().getActiveShell()); fd.open(); File file = new File(fd.getFilterPath() + "/" + fd.getFileName()); try { path.getDocument().set(file.toURI().toURL().toString()); } catch (MalformedURLException e) { log.userError(e.getMessage()); } } /** * generates the string representation of the MIME-Type of a selected file * * @param url the URL of a selected file * @return the format of the file as a string */ private String getFormat(String url) { Set<String> supportedGraphicFormats = new HashSet<String>(Arrays.asList(ImageIO.getReaderMIMETypes())); String extension = url.substring(url.lastIndexOf(".") + 1); Iterator<String> it = supportedGraphicFormats.iterator(); String format = null; while (it.hasNext()) { String next = it.next(); if (next.contains(extension.toLowerCase())) { format = next; } } if (format == null) { log.userError("PointGraphicEditor_ErrorMessageFormat"); return ""; } else return format; } /** * @see Editor#getControl() */ @Override public Control getControl() { return page; } /** * @see Editor#getValue() */ @Override public PointSymbolizer getValue() throws Exception { try { chosenFile = new URL(path.getDocument().get()); } catch (MalformedURLException e) { throw new IllegalStateException(Messages.PointGraphicEditor_ErrorMessageFile, e); } return styleBuilder.createPointSymbolizer(styleBuilder.createGraphic( styleBuilder.createExternalGraphic(chosenFile.toString(), getFormat(chosenFile.toString())), null, null)); } /** * @see Editor#isChanged() */ @Override public boolean isChanged() { return changed; } /** * @see Editor#setValue(Object) */ @Override public void setValue(PointSymbolizer pointSym) { // unused } }