descent.internal.ui.viewsupport.StorageLabelProvider.java Source code

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Here is the source code for descent.internal.ui.viewsupport.StorageLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package descent.internal.ui.viewsupport;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.resources.IStorage;

import org.eclipse.swt.graphics.Image;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.LabelProvider;

import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.IFileEditorMapping;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;

/**
 * Standard label provider for IStorage objects.
 * Use this class when you want to present IStorage objects in a viewer.
 */
public class StorageLabelProvider extends LabelProvider {

    private IEditorRegistry fEditorRegistry = null;
    private Map fJarImageMap = new HashMap(10);
    private Image fDefaultImage;

    private IEditorRegistry getEditorRegistry() {
        if (fEditorRegistry == null)
            fEditorRegistry = PlatformUI.getWorkbench().getEditorRegistry();
        return fEditorRegistry;
    }

    /* (non-Javadoc)
     * @see ILabelProvider#getImage
     */
    public Image getImage(Object element) {
        if (element instanceof IStorage)
            return getImageForJarEntry((IStorage) element);

        return super.getImage(element);
    }

    /* (non-Javadoc)
     * @see ILabelProvider#getText
     */
    public String getText(Object element) {
        if (element instanceof IStorage)
            return ((IStorage) element).getName();

        return super.getText(element);
    }

    /* (non-Javadoc)
     * 
     * @see IBaseLabelProvider#dispose
     */
    public void dispose() {
        if (fJarImageMap != null) {
            Iterator each = fJarImageMap.values().iterator();
            while (each.hasNext()) {
                Image image = (Image) each.next();
                image.dispose();
            }
            fJarImageMap = null;
        }
        fDefaultImage = null;
    }

    /*
     * Gets and caches an image for a JarEntryFile.
     * The image for a JarEntryFile is retrieved from the EditorRegistry.
     */
    private Image getImageForJarEntry(IStorage element) {
        if (fJarImageMap == null)
            return getDefaultImage();

        if (element == null || element.getName() == null)
            return getDefaultImage();

        // Try to find icon for full name
        String name = element.getName();
        Image image = (Image) fJarImageMap.get(name);
        if (image != null)
            return image;
        IFileEditorMapping[] mappings = getEditorRegistry().getFileEditorMappings();
        int i = 0;
        while (i < mappings.length) {
            if (mappings[i].getLabel().equals(name))
                break;
            i++;
        }
        String key = name;
        if (i == mappings.length) {
            // Try to find icon for extension
            IPath path = element.getFullPath();
            if (path == null)
                return getDefaultImage();
            key = path.getFileExtension();
            if (key == null)
                return getDefaultImage();
            image = (Image) fJarImageMap.get(key);
            if (image != null)
                return image;
        }

        // Get the image from the editor registry   
        ImageDescriptor desc = getEditorRegistry().getImageDescriptor(name);
        image = desc.createImage();

        fJarImageMap.put(key, image);

        return image;
    }

    private Image getDefaultImage() {
        if (fDefaultImage == null)
            fDefaultImage = PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJ_FILE);
        return fDefaultImage;
    }
}