Util.java Source code

Introduction

Here is the source code for Util.java

Source

/*
 * This file is part of aion-emu <aion-emu.com>.
 *
 * aion-emu 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 3 of the License, or
 * (at your option) any later version.
 *
 * aion-emu is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with aion-emu.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * This class contains utilities that are used when we are working with classes
 * 
 * @author SoulKeeper
 */
public class Util {

    /**
     * Return true if class a is either equivalent to class b, or if class a is a subclass of class b, i.e. if a either
     * "extends" or "implements" b. Note tht either or both "Class" objects may represent interfaces.
     * 
     * @param a
     *            class
     * @param b
     *            class
     * @return true if a == b or a extends b or a implements b
     */
    @SuppressWarnings("rawtypes")
    public static boolean isSubclass(Class<?> a, Class<?> b) {
        // We rely on the fact that for any given java class or
        // primtitive type there is a unqiue Class object, so
        // we can use object equivalence in the comparisons.
        if (a == b) {
            return true;
        }
        if (a == null || b == null) {
            return false;
        }
        for (Class x = a; x != null; x = x.getSuperclass()) {
            if (x == b) {
                return true;
            }
            if (b.isInterface()) {
                Class[] interfaces = x.getInterfaces();
                for (Class anInterface : interfaces) {
                    if (isSubclass(anInterface, b)) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

}