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/*-
* ============LICENSE_START=======================================================
* policy-utils
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
/**
*
*/
package org.openecomp.policy.drools.utils;
import org.openecomp.policy.common.logging.eelf.PolicyLogger;
/**
* Reflection utilities
*
*/
public class ReflectionUtil {
/**
* returns (if exists) a class fetched from a given classloader
*
* @param classLoader the class loader
* @param classname the class name
* @return the PolicyEvent class
* @throws IllegalArgumentException if an invalid parameter has been passed in
*/
public static Class<?> fetchClass(ClassLoader classLoader,
String classname)
throws IllegalArgumentException {
PolicyLogger.info("FETCH-CLASS: " + classname + " FROM " + classLoader);
if (classLoader == null)
throw new IllegalArgumentException("A class loader must be provided");
if (classname == null)
throw new IllegalArgumentException("A class name to be fetched in class loader " +
classLoader + " must be provided");
try {
Class<?> aClass = Class.forName(classname,
true,
classLoader);
return aClass;
} catch (Exception e) {
e.printStackTrace();
PolicyLogger.error("FETCH-CLASS: " + classname + " IN " + classLoader + " does NOT exist");
}
return null;
}
/**
*
* @param classLoader target class loader
* @param classname class name to fetch
* @return true if exists
* @throws IllegalArgumentException if an invalid parameter has been passed in
*/
public static boolean isClass(ClassLoader classLoader, String classname)
throws IllegalArgumentException {
return fetchClass(classLoader, classname) != null;
}
/**
* is a subclass?
* @param parent superclass
* @param presumedSubclass subclass
* @return
*/
public static boolean isSubclass(Class<?> parent, Class<?> presumedSubclass) {
PolicyLogger.debug("IS-SUBCLASS: superclass: " + parent.getCanonicalName() +
" subclass: " + presumedSubclass.getCanonicalName());
return (parent.isAssignableFrom(presumedSubclass));
}
}
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