tinyos.dlrc.views.NodeLabelComparator.java Source code

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Here is the source code for tinyos.dlrc.views.NodeLabelComparator.java

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/*
 * Dlrc 2, NesC development in Eclipse.
 * Copyright (C) 2009 DLRC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Web:  http://tos-ide.ethz.ch
 * Mail: tos-ide@tik.ee.ethz.ch
 */
package tinyos.dlrc.views;

import java.text.Collator;
import java.util.Comparator;

import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;

import tinyos.dlrc.TinyOSPlugin;
import tinyos.dlrc.ep.parser.TagSet;
import tinyos.dlrc.views.NodeContentProvider.Element;

/**
 * A comparator that can compare the elements of a {@link NodeContentProvider},
 * this comparator uses the label of the nodes for comparison.
 * @author Benjamin Sigg
 */
public class NodeLabelComparator extends ViewerComparator implements Comparator<NodeContentProvider.Element> {
    private Comparator<TagSet> tagComparator = TinyOSPlugin.getDefault().getParserFactory().createComparator();
    private Collator stringComparator = Collator.getInstance();

    private String property;

    public NodeLabelComparator(String property) {
        this.property = property;
    }

    public int compare(Element a, Element b) {
        TagSet tagsA = a.getTags();
        TagSet tagsB = b.getTags();

        int check = tagComparator.compare(tagsA, tagsB);
        if (check != 0)
            return check;

        String labelA = a.getLabel();
        String labelB = b.getLabel();

        if (labelA == null && labelB == null)
            return 0;

        if (labelA == null)
            return 1;

        if (labelB == null)
            return -1;

        return stringComparator.compare(labelA, labelB);
    }

    @Override
    public int compare(Viewer viewer, Object e1, Object e2) {
        if (e1 instanceof Element && e2 instanceof Element)
            return compare((Element) e1, (Element) e2);
        else
            return 0;
    }

    @Override
    public boolean isSorterProperty(Object element, String property) {
        if (this.property == null)
            return true;

        return this.property.equals(property);
    }
}