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

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

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/*******************************************************************************
 * Copyright (c) 2000, 2011 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 java.util.LinkedList;

import org.eclipse.help.IContext2;
import org.eclipse.help.IHelpResource;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;

public class ContextHelpSorter extends ViewerComparator {
    private IContext2 context;
    private LinkedList list;

    public ContextHelpSorter(IContext2 context) {
        super(ReusableHelpPart.SHARED_COLLATOR);
        list = new LinkedList();
        this.context = context;
    }

    public void sort(Viewer viewer, Object[] elements) {
        for (int i = 0; i < elements.length; i++) {
            IHelpResource r1 = (IHelpResource) elements[i];
            String c1 = context.getCategory(r1);
            if (!list.contains(c1)) {
                list.add(c1);
            }
        }
        super.sort(viewer, elements);
    }

    /* (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) {
        if (!(e2 instanceof IHelpResource)) {
            return -1;
        }
        if (!(e1 instanceof IHelpResource)) {
            return 1;
        }
        IHelpResource r1 = (IHelpResource) e1;
        IHelpResource r2 = (IHelpResource) e2;
        String c1 = context.getCategory(r1);
        String c2 = context.getCategory(r2);
        int i1 = list.indexOf(c1);
        int i2 = list.indexOf(c2);
        return i1 - i2;
    }
}