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/*******************************************************************************
* Copyright (c) 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.ui.trace.internal;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.ui.trace.internal.datamodel.TracingNode;
/**
* A Comparator for ordering the list of traceable bundles visible in a viewer in alphabetical order
*/
public class TracingComponentComparator extends ViewerComparator {
/**
* Either the first or second object are null - so compare them to ensure they are put in the right order.
*
* @param object1
* The first object to compare
* @param object2
* The second object to compare
* @return Return 0 if both objects are null; Returns -1 if object1 is null and object2 is not null; Returns 1 if
* object1 is not null and object2 is null.
*/
private int compareNullCases(final Object object1, final Object object2) {
int result = -1;
// take care of the null cases
if ((object1 == null) && (object2 == null)) {
result = 0;
} else if ((object1 == null) && (object2 != null)) {
result = -1;
} else if ((object1 != null) && (object2 == null)) {
result = 1;
}
return result;
}
@Override
public int compare(final Viewer viewer, final Object object1, final Object object2) {
int result = -1;
if ((object1 == null) || (object2 == null)) {
// take care of the null cases
result = this.compareNullCases(object1, object2);
} else {
// neither object are null
if ((object1 instanceof TracingNode) && (object2 instanceof TracingNode)) {
String name1 = ((TracingNode) object1).getLabel();
String name2 = ((TracingNode) object2).getLabel();
if ((name1 == null) || (name2 == null)) {
// take care of the null cases
result = this.compareNullCases(name1, name2);
} else {
result = name1.compareTo(name2);
}
} else if (object1 instanceof String && object2 instanceof String) {
String label1 = (String) object1;
String label2 = (String) object2;
result = label1.compareTo(label2);
}
}
return result;
}
}
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