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

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Here is the source code for eu.esdihumboldt.hale.ui.schema.presets.internal.SchemaPresetLabelProvider.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 java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.StyledCellLabelProvider;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.plugin.AbstractUIPlugin;

import eu.esdihumboldt.hale.ui.schema.presets.extension.SchemaCategory;
import eu.esdihumboldt.hale.ui.schema.presets.extension.SchemaCategoryExtension;
import eu.esdihumboldt.hale.ui.schema.presets.extension.SchemaPreset;

/**
 * Label provider for {@link SchemaPreset}s.
 * 
 * @author Simon Templer
 */
public class SchemaPresetLabelProvider extends StyledCellLabelProvider implements ILabelProvider {

    private final Image defImage = AbstractUIPlugin
            .imageDescriptorFromPlugin("eu.esdihumboldt.hale.ui.schema.presets", "icons/def_preset.gif")
            .createImage();
    private final Image categoryImage = PlatformUI.getWorkbench().getSharedImages()
            .getImage(ISharedImages.IMG_OBJ_FOLDER);

    private final Map<String, Image> urlImages = new HashMap<String, Image>();

    @Override
    public void update(ViewerCell cell) {
        Object element = cell.getElement();

        StyledString text = new StyledString();

        if (element instanceof SchemaPreset) {
            SchemaPreset schema = (SchemaPreset) element;
            text.append(schema.getName());
        }
        if (element instanceof SchemaCategory) {
            text.append(((SchemaCategory) element).getName());
        }

        if (element instanceof SchemaPreset) {
            SchemaPreset preset = (SchemaPreset) element;

            String version = preset.getVersion();
            if (version != null) {
                text.append(" " + version, StyledString.COUNTER_STYLER);
            }

            String tag = preset.getTag();
            if (tag != null) {
                text.append(" (" + tag + ")", StyledString.DECORATIONS_STYLER);
            }
        }

        cell.setImage(getImage(element));
        cell.setText(text.toString());
        cell.setStyleRanges(text.getStyleRanges());

        super.update(cell);
    }

    @Override
    public Image getImage(Object element) {
        if (element instanceof SchemaPreset) {
            SchemaPreset schema = (SchemaPreset) element;
            URL iconURL = schema.getIconURL();
            if (iconURL != null) {
                String key = iconURL.toString();
                Image image = urlImages.get(key);
                if (image == null) {
                    image = ImageDescriptor.createFromURL(iconURL).createImage();
                    urlImages.put(key, image);
                }
                return image;
            }

            return defImage;
        }
        if (element instanceof SchemaCategory) {
            return categoryImage;
        }
        return null;
    }

    @Override
    public String getText(Object element) {
        if (element instanceof SchemaPreset) {
            SchemaPreset schema = (SchemaPreset) element;
            // name and category name for search
            return schema.getName() + "("
                    + SchemaCategoryExtension.getInstance().get(schema.getCategoryId()).getName() + ")";
        }
        if (element instanceof SchemaCategory) {
            return ((SchemaCategory) element).getName();
        }

        return element.toString();
    }

    @Override
    public void dispose() {
        for (Image image : urlImages.values()) {
            image.dispose();
        }
        urlImages.clear();

        defImage.dispose();

        super.dispose();
    }

}