/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.web.websocket.spi;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
public class GenericParameterUtility {
public static Class<?> getTypeParameter (Class<?> objectClass, Class<?> targetInterface) {
Class<?> currentClass = objectClass;
do {
for (Type interfaceType : currentClass.getGenericInterfaces()) {
if (interfaceType instanceof ParameterizedType) {
Type rawType;
if (((rawType = ((ParameterizedType)interfaceType).getRawType()) instanceof Class) && targetInterface.isAssignableFrom((Class)rawType)) {
Type[] typeArguments;
if ((typeArguments = ((ParameterizedType)interfaceType).getActualTypeArguments()).length == 1) {
if (typeArguments[0] instanceof Class) {
return (Class)typeArguments[0];
}
}
}
}
}
} while ((currentClass = currentClass.getSuperclass()) != null);
throw new MalformedMessageHandlerException("Unable to determine the parameterized type of %s(%s)", targetInterface.getName(), objectClass.getName());
}
}