eu.esdihumboldt.hale.io.gml.ui.wfs.AbstractWFSSource.java Source code

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Here is the source code for eu.esdihumboldt.hale.io.gml.ui.wfs.AbstractWFSSource.java

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/*
 * 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;

import java.io.InputStream;
import java.net.URI;

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.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

import eu.esdihumboldt.hale.common.core.io.IOProvider;
import eu.esdihumboldt.hale.common.core.io.ImportProvider;
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;

/**
 * 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 WfsUrlFieldEditor sourceURL;

    /**
     * @see ImportSource#createControls(Composite)
     */
    @Override
    public void createControls(Composite parent) {
        parent.setLayout(new GridLayout(3, 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, 2, 1));

        // source file
        sourceURL = createWfsFieldEditor(parent);
        sourceURL.setPage(getPage());

        sourceURL.setPropertyChangeListener(new IPropertyChangeListener() {

            @Override
            public void propertyChange(PropertyChangeEvent event) {
                if (event.getProperty().equals(FieldEditor.IS_VALID)) {
                    updateState(false);
                } else if (event.getProperty().equals(FieldEditor.VALUE)) {
                    updateState(false);
                }
            }
        });

        // 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, 2, 1));

        // initial state update
        updateState(true);
    }

    /**
     * Get the caption for the source page
     * 
     * @return the caption
     */
    protected abstract String getCaption();

    /**
     * Create the WFS field editor to use in the page.
     * 
     * @param parent the parent composite
     * @return the WFS field editor
     */
    protected abstract WfsUrlFieldEditor createWfsFieldEditor(Composite parent);

    /**
     * @see AbstractProviderSource#getSource()
     */
    @Override
    protected LocatableInputSupplier<? extends InputStream> getSource() {
        try {
            URI uri = sourceURL.getURL().toURI();
            return new DefaultInputSupplier(uri);
        } catch (Throwable e) {
            return null;
        }
    }

    /**
     * @see AbstractProviderSource#isValidSource()
     */
    @Override
    protected boolean isValidSource() {
        return sourceURL.isValid() && sourceURL.getURL() != null;
    }

    /**
     * @see AbstractSource#onActivate()
     */
    @Override
    public void onActivate() {
        sourceURL.setFocus();
    }

}