eu.esdihumboldt.hale.ui.schema.presets.PresetsSource.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.schema.presets.PresetsSource.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:
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.schema.presets;

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

import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

import eu.esdihumboldt.hale.common.core.io.HaleIO;
import eu.esdihumboldt.hale.common.core.io.supplier.LocatableInputSupplier;
import eu.esdihumboldt.hale.common.schema.io.SchemaReader;
import eu.esdihumboldt.hale.ui.io.ImportSource;
import eu.esdihumboldt.hale.ui.io.source.AbstractProviderSource;
import eu.esdihumboldt.hale.ui.schema.presets.extension.SchemaPreset;
import eu.esdihumboldt.hale.ui.schema.presets.internal.SchemaPresetSelector;

/**
 * TODO Type description
 * 
 * @author Simon Templer
 */
public class PresetsSource extends AbstractProviderSource<SchemaReader> {

    private SchemaPresetSelector selector;
    private Label description;

    /**
     * @see AbstractProviderSource#getSource()
     */
    @Override
    protected LocatableInputSupplier<? extends InputStream> getSource() {
        if (selector != null && selector.getSelectedObject() != null) {
            return selector.getSelectedObject().getLocation();
        }
        return null;
    }

    /**
     * @see AbstractProviderSource#isValidSource()
     */
    @Override
    protected boolean isValidSource() {
        return selector.getSelectedObject() != null;
    }

    /**
     * @see AbstractProviderSource#updateContentType()
     */
    @Override
    protected void updateContentType() {
        LocatableInputSupplier<? extends InputStream> source = getSource();
        IContentType contentType = null;
        if (source != null) {
            URI loc = source.getLocation();
            String filename = null;
            if (loc != null) {
                filename = loc.getPath();
            }
            contentType = HaleIO.findContentType(SchemaReader.class, source, filename);
        }
        getConfiguration().setContentType(contentType);

        super.updateContentType();
    }

    /**
     * @see ImportSource#createControls(Composite)
     */
    @Override
    public void createControls(Composite parent) {
        GridLayoutFactory parentLayout = GridLayoutFactory.swtDefaults().numColumns(2).equalWidth(false);
        parentLayout.applyTo(parent);

        GridDataFactory labelData = GridDataFactory//
                .swtDefaults()//
                .align(SWT.BEGINNING, SWT.CENTER);

        GridDataFactory controlData = GridDataFactory//
                .swtDefaults()//
                .align(SWT.FILL, SWT.CENTER)//
                .grab(true, false);

        // preset label
        Label label = new Label(parent, SWT.NONE);
        label.setText("Select preset:");
        labelData.applyTo(label);

        // preset selector
        selector = new SchemaPresetSelector(parent);
        selector.addSelectionChangedListener(new ISelectionChangedListener() {

            @Override
            public void selectionChanged(SelectionChangedEvent event) {
                if (description != null) {
                    SchemaPreset schema = selector.getSelectedObject();
                    if (schema != null && schema.getDescription() != null) {
                        description.setText(schema.getDescription());
                    } else {
                        description.setText("");
                    }
                }
                updateState(true);
            }
        });
        controlData.applyTo(selector.getControl());

        // skipper
        Composite empty = new Composite(parent, SWT.NONE);
        GridDataFactory.swtDefaults().hint(1, 1).applyTo(empty);

        // description label
        description = new Label(parent, SWT.WRAP);
        GridDataFactory.fillDefaults().grab(true, true).applyTo(description);

        // preset label
        label = new Label(parent, SWT.NONE);
        label.setText("Import as");
        labelData.applyTo(label);

        // create provider combo
        ComboViewer providers = createProviders(parent);
        controlData.applyTo(providers.getControl());

        // prevent selector appearing very small
        parent.pack();

        // initial state update
        updateState(true);
    }

}