com.google.dart.tools.ui.internal.viewsupport.NameElementComparator.java Source code

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Here is the source code for com.google.dart.tools.ui.internal.viewsupport.NameElementComparator.java

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/*
 * Copyright (c) 2013, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.dart.tools.ui.internal.viewsupport;

import com.google.dart.engine.element.Element;

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

/**
 * {@link ViewerComparator} which sorts the {@link Element}s by their names.
 */
public class NameElementComparator extends ViewerComparator {
    public static final ViewerComparator INSTANCE = new NameElementComparator();

    private NameElementComparator() {
    }

    @Override
    public int compare(Viewer viewer, Object e1, Object e2) {
        if (!(e1 instanceof Element)) {
            return 0;
        }
        if (!(e2 instanceof Element)) {
            return 0;
        }
        String name1 = ((Element) e1).getDisplayName();
        String name2 = ((Element) e2).getDisplayName();
        if (name1 == null || name2 == null) {
            return 0;
        }
        return name1.compareTo(name2);
    }
}