/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2009 - 2012 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of any organization.
 * #L%
 */

package imagej.plugin;

import imagej.AbstractContextual;
import imagej.Contextual;
import imagej.Prioritized;
import imagej.Priority;

/**
 * Abstract base class for {@link Contextual}, {@link Prioritized} plugins.
 * 
 * @author Curtis Rueden
 */
public abstract class SortablePlugin extends AbstractContextual
	implements Prioritized, ImageJPlugin
{

	/** The priority of the plugin. */
	private double priority = Priority.NORMAL_PRIORITY;

	// -- Prioritized methods --

	@Override
	public double getPriority() {
		return priority;
	}

	@Override
	public void setPriority(final double priority) {
		this.priority = priority;
	}

	// -- Comparable methods --

	@Override
	public int compareTo(final Prioritized that) {
		return Priority.compare(this, that);
	}

}

@@ -1953,16 +1953,47 @@
 riority;
+%0Aimport imagej.util.ClassUtils;
 %0A%0A/**%0A *
@@ -2578,42 +2578,250 @@
 %7B%0A%09%09
-return Priority.compare(this, that
+if (that == null) return 1;%0A%0A%09%09// compare priorities%0A%09%09final int priorityCompare = Priority.compare(this, that);%0A%09%09if (priorityCompare != 0) return priorityCompare;%0A%0A%09%09// compare classes%0A%09%09return ClassUtils.compare(getClass(), that.getClass()
 );%0A%09

improve compareTo logic