name.schedenig.eclipse.grepconsole.view.styles.StyleComparator.java Source code

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Here is the source code for name.schedenig.eclipse.grepconsole.view.styles.StyleComparator.java

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/*******************************************************************************
 * Copyright (c) 2008 - 2014 Marian Schedenig
 * 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:
 *    Marian Schedenig - initial API and implementation
 *******************************************************************************/

package name.schedenig.eclipse.grepconsole.view.styles;

import name.schedenig.eclipse.grepconsole.model.GrepStyle;

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

/**
 * Comapres two styles by name. Can handle the style content provider's null
 * element style.
 * 
 * @author msched
 */
public class StyleComparator extends ViewerComparator {
    /**
     * @see org.eclipse.jface.viewers.ViewerComparator#compare(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(Viewer viewer, Object e1, Object e2) {
        if (e1 == StyleContentProvider.NULL_ELEMENT && e2 == StyleContentProvider.NULL_ELEMENT) {
            return 0;
        } else if (e1 == StyleContentProvider.NULL_ELEMENT) {
            return -1;
        } else if (e2 == StyleContentProvider.NULL_ELEMENT) {
            return +1;
        }

        GrepStyle s1 = (GrepStyle) e1;
        GrepStyle s2 = (GrepStyle) e2;

        String n1 = s1.getName();
        String n2 = s2.getName();

        if (n1 == n2) {
            return 0;
        } else if (n1 == null) {
            return -1;
        } else if (n2 == null) {
            return +1;
        } else {
            return n1.compareTo(n2);
        }
    }
}