eu.esdihumboldt.hale.ui.schema.presets.internal.SchemaPresetSelectionDialog.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.schema.presets.internal.SchemaPresetSelectionDialog.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.internal;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.dialogs.FilteredTree;
import org.eclipse.ui.dialogs.PatternFilter;

import eu.esdihumboldt.hale.ui.schema.presets.extension.SchemaCategoryExtension;
import eu.esdihumboldt.hale.ui.schema.presets.extension.SchemaPreset;
import eu.esdihumboldt.hale.ui.util.selector.AbstractViewerSelectionDialog;

/**
 * Dialog for selecting a {@link SchemaPreset}.
 * 
 * @author Simon Templer
 */
public class SchemaPresetSelectionDialog extends AbstractViewerSelectionDialog<SchemaPreset, TreeViewer> {

    /**
     * Create a dialog for selecting a {@link SchemaPreset}.
     * 
     * @param parentShell the parent shell
     * @param initialSelection the initial selection
     */
    public SchemaPresetSelectionDialog(Shell parentShell, SchemaPreset initialSelection) {
        super(parentShell, "Select a schema", initialSelection);
    }

    /**
     * @see AbstractViewerSelectionDialog#createViewer(Composite)
     */
    @Override
    protected TreeViewer createViewer(Composite parent) {
        PatternFilter patternFilter = new PatternFilter();
        patternFilter.setIncludeLeadingWildcard(true);
        FilteredTree tree = new FilteredTree(parent, SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER,
                patternFilter, true);
        tree.getViewer().setComparator(new SchemaPresetComparator());

        // set filter to only accept schema selection (must be set after
        // pattern filter is created)
        setFilters(new ViewerFilter[] { new ViewerFilter() {

            @Override
            public boolean select(Viewer viewer, Object parentElement, Object element) {
                return element instanceof SchemaPreset;
            }
        } });

        return tree.getViewer();
    }

    /**
     * @see AbstractViewerSelectionDialog#setupViewer(StructuredViewer, Object)
     */
    @Override
    protected void setupViewer(TreeViewer viewer, SchemaPreset initialSelection) {
        viewer.setLabelProvider(new SchemaPresetLabelProvider());
        viewer.setContentProvider(new SchemaPresetContentProvider());

        viewer.setInput(SchemaCategoryExtension.getInstance().getElements());

        if (initialSelection != null) {
            viewer.setSelection(new StructuredSelection(initialSelection));
        }
    }

    /**
     * @see AbstractViewerSelectionDialog#getObjectFromSelection(ISelection)
     */
    @Override
    protected SchemaPreset getObjectFromSelection(ISelection selection) {
        if (!selection.isEmpty() && selection instanceof IStructuredSelection) {
            Object element = ((IStructuredSelection) selection).getFirstElement();
            if (element instanceof SchemaPreset) {
                return (SchemaPreset) element;
            }
        }

        return null;
    }

}