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.wfs.ui; import java.io.InputStream; import java.net.URI; import java.util.Collection; import java.util.HashSet; import javax.annotation.Nullable; import org.apache.http.NameValuePair; import org.apache.http.client.utils.URIBuilder; import org.eclipse.core.runtime.content.IContentType; import org.eclipse.jface.preference.FieldEditor; 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 com.google.common.base.Predicate; 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.DefaultInputSupplier; import eu.esdihumboldt.hale.common.core.io.supplier.LocatableInputSupplier; import eu.esdihumboldt.hale.ui.io.ImportSource; import eu.esdihumboldt.hale.ui.io.source.AbstractProviderSource; import eu.esdihumboldt.hale.ui.io.source.AbstractSource; import eu.esdihumboldt.hale.ui.io.source.URLSourceURIFieldEditor; import eu.esdihumboldt.hale.ui.util.io.URIFieldEditor; /** * Abstract base implementation for import sources based on WFS * * @param <P> the supported {@link IOProvider} type * * @author Simon Templer */ public abstract class AbstractWFSSource<P extends ImportProvider> extends AbstractProviderSource<P> { private URLSourceURIFieldEditor sourceURL; /** * @see ImportSource#createControls(Composite) */ @Override public void createControls(Composite parent) { parent.setLayout(new GridLayout(4, false)); // caption new Label(parent, SWT.NONE); // placeholder Label caption = new Label(parent, SWT.NONE); caption.setText(getCaption()); caption.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, true, false, 3, 1)); // source file // target URL field sourceURL = new URLSourceURIFieldEditor("sourceURL", "URL:", parent) { // the following methods are overridden so the capabilities button // may appear on the same line @Override public int getNumberOfControls() { return super.getNumberOfControls() + 1; } @Override protected void doFillIntoGrid(Composite parent, int numColumns) { super.doFillIntoGrid(parent, numColumns - 1); } }; sourceURL.setPage(getPage()); // set custom URI filter sourceURL.setURIFilter(createHistoryURIFilter()); // set content types for URI field Collection<IOProviderDescriptor> factories = getConfiguration().getFactories(); HashSet<IContentType> supportedTypes = new HashSet<IContentType>(); for (IOProviderDescriptor factory : factories) { supportedTypes.addAll(factory.getSupportedTypes()); } sourceURL.setContentTypes(supportedTypes); sourceURL.setPropertyChangeListener(new IPropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent event) { if (event.getProperty().equals(FieldEditor.IS_VALID)) { getPage().setMessage(null); updateState(true); } else if (event.getProperty().equals(FieldEditor.VALUE)) { getPage().setMessage(null); updateState(true); } } }); // button to determine from capabilities Button capButton = new Button(parent, SWT.PUSH); capButton.setText("..."); capButton.setToolTipText("Determine based on WFS Capabilities"); capButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { determineSource(sourceURL); } }); // 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)); // initial state update updateState(true); } /** * @return a custom filter for the URI history */ @Nullable protected Predicate<? super URI> createHistoryURIFilter() { return new Predicate<URI>() { @Override public boolean apply(URI input) { String expectedRequest = getWFSRequestValue(); URIBuilder uri = new URIBuilder(input); for (NameValuePair param : uri.getQueryParams()) { if ("request".equalsIgnoreCase(param.getName()) && expectedRequest.equals(param.getValue())) { return true; } } return false; } }; } /** * @return the value to use for the REQUEST parameter for a WFS request with * this source */ protected abstract String getWFSRequestValue(); /** * Let the user determine the source URL to use, e.g. though a dialog or * wizard. * * @param sourceURL the source URL field to edit */ protected abstract void determineSource(URIFieldEditor sourceURL); /** * Get the caption for the source page * * @return the caption */ protected abstract String getCaption(); /** * @see AbstractProviderSource#getSource() */ @Override protected LocatableInputSupplier<? extends InputStream> getSource() { try { URI uri = sourceURL.getURI(); return new DefaultInputSupplier(uri); } catch (Throwable e) { return null; } } /** * @see AbstractProviderSource#isValidSource() */ @Override protected boolean isValidSource() { return sourceURL.isValid() && sourceURL.getURI() != null; } /** * @see AbstractSource#onActivate() */ @Override public void onActivate() { sourceURL.setFocus(); } }