Mega Code Archive
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 impl
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/*
* 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;
}
}
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