au.gov.ga.earthsci.intent.IntentSelectionDialogTableLabelProvider.java Source code

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Here is the source code for au.gov.ga.earthsci.intent.IntentSelectionDialogTableLabelProvider.java

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/*******************************************************************************
 * Copyright 2013 Geoscience Australia
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package au.gov.ga.earthsci.intent;

import java.net.URL;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.jface.viewers.BaseLabelProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;

import au.gov.ga.earthsci.common.util.Util;

/**
 * Label provider for the table viewer in the {@link IntentSelectionDialog}.
 * 
 * @author Michael de Hoog (michael.dehoog@ga.gov.au)
 */
public class IntentSelectionDialogTableLabelProvider extends BaseLabelProvider implements ITableLabelProvider {
    private final ImageRegistry registry;

    public IntentSelectionDialogTableLabelProvider() {
        registry = new ImageRegistry(Display.getDefault());
    }

    @Override
    public void dispose() {
        registry.dispose();
        super.dispose();
    }

    @Override
    public Image getColumnImage(Object element, int columnIndex) {
        IntentFilter filter = (IntentFilter) element;
        URL url = filter.getIcon();
        if (url != null) {
            Image image = registry.get(url.toString());
            if (image == null) {
                registry.put(url.toString(), ImageDescriptor.createFromURL(url));
                image = registry.get(url.toString());
            }
            return image;
        }
        return null;
    }

    @Override
    public String getColumnText(Object element, int columnIndex) {
        IntentFilter filter = (IntentFilter) element;
        String label = filter.getLabel();
        if (!Util.isEmpty(label)) {
            return label;
        }
        return filter.getHandler().getName();
    }
}