org.eclipse.help.ui.internal.views.FederatedSearchSorter.java Source code

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Here is the source code for org.eclipse.help.ui.internal.views.FederatedSearchSorter.java

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/*******************************************************************************
 * Copyright (c) 2000, 2006 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.help.ui.internal.views;

import org.eclipse.help.IHelpResource;
import org.eclipse.help.search.ISearchEngineResult;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;

public class FederatedSearchSorter extends ViewerComparator {
    public FederatedSearchSorter() {
        super(ReusableHelpPart.SHARED_COLLATOR);
    }

    public int category(Object element) {
        if (element instanceof ISearchEngineResult) {
            ISearchEngineResult r = (ISearchEngineResult) element;
            IHelpResource c = r.getCategory();
            if (c != null) {
                String label = c.getLabel();
                if (label.length() == 0)
                    return 10;
                return 5;
            }
        }
        return super.category(element);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ViewerComparator#compare(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
     */
    public int compare(Viewer viewer, Object e1, Object e2) {
        int cat1 = category(e1);
        int cat2 = category(e2);

        if (cat1 != cat2)
            return cat1 - cat2;
        try {
            ISearchEngineResult r1 = (ISearchEngineResult) e1;
            ISearchEngineResult r2 = (ISearchEngineResult) e2;
            IHelpResource c1 = r1.getCategory();
            IHelpResource c2 = r2.getCategory();
            if (c1 != null && c2 != null) {
                int cat = super.compare(viewer, c1.getLabel(), c2.getLabel());
                if (cat != 0)
                    return cat;
            }
            float rank1 = ((ISearchEngineResult) e1).getScore();
            float rank2 = ((ISearchEngineResult) e2).getScore();
            if (rank1 - rank2 > 0) {
                return -1;
            } else if (rank1 == rank2) {
                return 0;
            } else {
                return 1;
            }
        } catch (Exception e) {
        }
        return super.compare(viewer, e1, e2);
    }
}