org.eclipse.ltk.internal.ui.refactoring.ChangeElementLabelProvider.java Source code

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Here is the source code for org.eclipse.ltk.internal.ui.refactoring.ChangeElementLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2000, 2008 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 org.eclipse.ltk.internal.ui.refactoring;

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

import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;

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

class ChangeElementLabelProvider extends LabelProvider implements IFontProvider {

    private Map fDescriptorImageMap = new HashMap();

    public ChangeElementLabelProvider() {
    }

    public Image getImage(Object object) {
        return manageImageDescriptor(((PreviewNode) object).getImageDescriptor());
    }

    public String getText(Object object) {
        String text = ((PreviewNode) object).getText();
        if (isDerived(object)) {
            return Messages.format(RefactoringUIMessages.ChangeElementLabelProvider_derived, text);
        } else {
            return text;
        }
    }

    public Font getFont(Object element) {
        if (isDerived(element)) {
            return JFaceResources.getFontRegistry().getItalic(JFaceResources.DIALOG_FONT);
        } else {
            return null;
        }
    }

    private boolean isDerived(Object element) {
        PreviewNode node = (PreviewNode) element;
        return node.hasDerived();
    }

    public void dispose() {
        for (Iterator iter = fDescriptorImageMap.values().iterator(); iter.hasNext();) {
            Image image = (Image) iter.next();
            image.dispose();
        }
        super.dispose();
    }

    private Image manageImageDescriptor(ImageDescriptor descriptor) {
        Image image = (Image) fDescriptorImageMap.get(descriptor);
        if (image == null) {
            image = descriptor.createImage();
            fDescriptorImageMap.put(descriptor, image);
        }
        return image;
    }
}