ClassUtils.java

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/* *********************************************************************** *
 * project: org.matsim.*
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2010 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.core.utils.misc;

import java.util.HashSet;
import java.util.Set;
import java.util.Stack;

public final class ClassUtils {
    private ClassUtils(){} // do not instantiate

    public static Set<Class<?>> getAllTypes(final Class<?> klass) {
        Set<Class<?>> set = new HashSet<Class<?>>();
        Stack<Class<?>> stack = new Stack<Class<?>>();
        stack.add(klass);

        while (!stack.isEmpty()) {
            Class<?> c = stack.pop();
            set.add(c);
            for (Class<?> k : c.getInterfaces()) {
                stack.push(k);
            }
            if (c.getSuperclass() != null) {
                stack.push(c.getSuperclass());
            }
        }

        return set;
    }

    public static Set<Class<?>> getAllInterfaces( final Class<?> klass ) {
        Set<Class<?>> intfs = new HashSet<Class<?>>();
        for (Class<?> intf : klass.getInterfaces()) {
            intfs.add(intf);
            intfs.addAll(getAllInterfaces(intf));
        }
        if (!klass.isInterface()) {
            Class<?> superclass = klass.getSuperclass();
            while (superclass != Object.class) {
                intfs.addAll(getAllInterfaces(superclass));
                superclass = superclass.getSuperclass();
            }
        }
        return intfs;
    }
}