eu.esdihumboldt.hale.ui.common.function.viewer.FunctionLabelProvider.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.common.function.viewer.FunctionLabelProvider.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.ui.common.function.viewer;

import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.BaseLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;

import eu.esdihumboldt.hale.common.align.extension.category.Category;
import eu.esdihumboldt.hale.common.align.extension.function.AbstractFunction;

/**
 * Function label provider
 * 
 * @author Simon Templer
 */
public class FunctionLabelProvider extends LabelProvider {

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

    /**
     * @see LabelProvider#getText(Object)
     */
    @Override
    public String getText(Object element) {
        if (element instanceof Category) {
            return ((Category) element).getName();
        }
        if (element instanceof AbstractFunction) {
            return ((AbstractFunction<?>) element).getDisplayName();
        }

        return super.getText(element);
    }

    /**
     * @see LabelProvider#getImage(Object)
     */
    @Override
    public Image getImage(Object element) {
        if (element instanceof Category) {
            return PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJ_FOLDER);
        }

        // get image based on getIconURL in AbstractFunction (and cache them)
        if (element instanceof AbstractFunction) {
            URL iconUrl = ((AbstractFunction<?>) element).getIconURL();
            String iconString = iconUrl.toString();

            Image image = urlImages.get(iconString);

            if (image == null) {
                try {
                    image = ImageDescriptor.createFromURL(iconUrl).createImage();
                    if (image != null) {
                        urlImages.put(iconString, image);
                    }
                } catch (Throwable e) {
                    // ignore
                }
            }

            return image;
        }

        return super.getImage(element);
    }

    /**
     * @see BaseLabelProvider#dispose()
     */
    @Override
    public void dispose() {
        // dispose any images created
        for (Image image : urlImages.values()) {
            image.dispose();
        }
        urlImages.clear();

        super.dispose();
    }

}