org.eclipse.pde.internal.ui.views.dependencies.DependenciesViewComparator.java Source code

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Here is the source code for org.eclipse.pde.internal.ui.views.dependencies.DependenciesViewComparator.java

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/*******************************************************************************
 *  Copyright (c) 2007, 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.pde.internal.ui.views.dependencies;

import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.osgi.service.resolver.*;
import org.eclipse.pde.internal.ui.PDEPlugin;

public class DependenciesViewComparator extends ViewerComparator {

    private static DependenciesViewComparator fComparator = null;

    private DependenciesViewComparator() {
        super();
    }

    public int compare(Viewer viewer, Object e1, Object e2) {
        return getId(e1).compareTo(getId(e2));
    }

    private String getId(Object obj) {
        BundleDescription desc = null;
        if (obj instanceof ImportPackageSpecification) {
            return ((ImportPackageSpecification) obj).getName();
        } else if (obj instanceof BundleSpecification) {
            desc = (BundleDescription) ((BundleSpecification) obj).getSupplier();
        } else if (obj instanceof BundleDescription)
            desc = (BundleDescription) obj;
        if (desc != null)
            return PDEPlugin.getDefault().getLabelProvider().getObjectText(desc);
        return ""; //$NON-NLS-1$
    }

    public static DependenciesViewComparator getViewerComparator() {
        if (fComparator == null)
            fComparator = new DependenciesViewComparator();
        return fComparator;
    }

}