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.io.gml.ui.wfs.wizard; import java.net.URL; import java.util.List; import java.util.Timer; import java.util.TimerTask; import org.eclipse.jface.dialogs.DialogPage; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.BusyIndicator; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import eu.esdihumboldt.hale.io.gml.ui.wfs.wizard.capabilities.GetCapabilititiesRetriever; import eu.esdihumboldt.hale.io.wfs.ui.WFSPreferences; /*+-------------+----------------------------------------------------------* *| | |_|_|_|_| Fraunhofer-Institut fuer Graphische Datenverarbeitung * *|__|__|_|_|_|_| (Fraunhofer Institute for Computer Graphics) * *| | |_|_|_|_| * *|__|__|_|_|_|_| * *| __ | ___| * *| /_ /_ / _ | Fraunhoferstrasse 5 * *|/ / / /__/ | D-64283 Darmstadt, Germany * *+-------------+----------------------------------------------------------*/ /** * WFS location field editor * * @author Simon Templer */ public class WfsLocationFieldEditor extends FieldEditor { /** * Delay for validating on modification in milliseconds */ private static final int MODIFY_VALIDATE_DELAY = 1200; private Combo combo; private boolean valid; private Timer timer; /** * @see FieldEditor#FieldEditor(String, String, Composite) */ public WfsLocationFieldEditor(String name, String labelText, Composite parent) { super(name, labelText, parent); } /** * @see FieldEditor#adjustForNumColumns(int) */ @Override protected void adjustForNumColumns(int numColumns) { GridData gd = (GridData) combo.getLayoutData(); gd.horizontalSpan = numColumns - 1; // We only grab excess space if we have to // If another field editor has more columns then // we assume it is setting the width. gd.grabExcessHorizontalSpace = gd.horizontalSpan == 1; } /** * @see FieldEditor#doFillIntoGrid(Composite, int) */ @Override protected void doFillIntoGrid(Composite parent, int numColumns) { getLabelControl(parent); combo = new Combo(parent, SWT.BORDER | SWT.DROP_DOWN); GridData layoutData = new GridData(SWT.FILL, SWT.CENTER, true, false, numColumns - 1, 1); combo.setLayoutData(layoutData); loadRecent(); refreshValidState(); combo.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { scheduleValidation(); // refreshValidState(); } }); } /** * Schedule the validation */ protected void scheduleValidation() { final Display display = Display.getCurrent(); synchronized (this) { if (timer != null) { timer.cancel(); } // invalidate invalidate(); // schedule validation timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { display.syncExec(new Runnable() { @Override public void run() { BusyIndicator.showWhile(display, new Runnable() { @Override public void run() { refreshValidState(); } }); } }); } }, MODIFY_VALIDATE_DELAY); } } /** * Load the recently used WFSes */ protected void loadRecent() { List<String> recent = WFSPreferences.getRecent(); combo.setItems(recent.toArray(new String[recent.size()])); if (!recent.isEmpty() && (combo.getText() == null || combo.getText().isEmpty())) { combo.setText(recent.get(0)); } } /** * Update the recently used WFSes */ public void updateRecent() { String value = combo.getText(); if (value != null && !value.isEmpty()) { List<String> recent = WFSPreferences.getRecent(); recent.remove(value); recent.add(0, value); WFSPreferences.setRecent(recent); } } /** * @see FieldEditor#doLoad() */ @Override protected void doLoad() { String value = getPreferenceStore().getString(getPreferenceName()); combo.setText((value == null) ? ("") : (value)); //$NON-NLS-1$ } /** * @see FieldEditor#doLoadDefault() */ @Override protected void doLoadDefault() { String value = getPreferenceStore().getDefaultString(getPreferenceName()); combo.setText((value == null) ? ("") : (value)); //$NON-NLS-1$ } /** * @see FieldEditor#doStore() */ @Override protected void doStore() { getPreferenceStore().setValue(getPreferenceName(), combo.getText()); } /** * @see FieldEditor#getNumberOfControls() */ @Override public int getNumberOfControls() { return 2; } /** * Get the value * * @return the value */ public String getValue() { return combo.getText(); } /** * Set the value * * @param value the value to set */ public void setValue(String value) { combo.setText((value == null) ? ("") : (value)); //$NON-NLS-1$ refreshValidState(); } /** * @see FieldEditor#isValid() */ @Override public boolean isValid() { return valid; } /** * @see FieldEditor#refreshValidState() */ @Override protected void refreshValidState() { boolean newValid = getValidState(); if (valid != newValid) { valid = newValid; fireStateChanged(IS_VALID, !valid, valid); } } /** * Invalidate the editor */ protected void invalidate() { if (valid) { valid = false; fireStateChanged(IS_VALID, !valid, valid); } } private boolean getValidState() { String value = getValue(); DialogPage page = getPage(); // try to create a URL try { new URL(value); } catch (Throwable e) { if (page != null) { page.setErrorMessage(e.getLocalizedMessage()); } return false; } // try to get capabilities? try { GetCapabilititiesRetriever.getDataStore(value); } catch (Throwable e) { if (page != null) { page.setErrorMessage(e.getLocalizedMessage()); } return false; } // passed all tests if (page != null) { page.setErrorMessage(null); } return true; } }