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/*-
* ============LICENSE_START=======================================================
* policy-utils
* ================================================================================
* Copyright (C) 2017-2018, 2021 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.onap.policy.drools.utils;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Reflection utilities.
*
*/
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class ReflectionUtil {
protected static final Logger logger = LoggerFactory.getLogger(ReflectionUtil.class);
/**
* returns (if exists) a class fetched from a given classloader.
*
* @param classLoader the class loader
* @param className the class name
* @return the actual class
* @throws IllegalArgumentException if an invalid parameter has been passed in
*/
public static Class<?> fetchClass(ClassLoader classLoader,
String className) {
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 {
return Class.forName(className, true, classLoader);
} catch (Exception e) {
logger.error("class {} fetched in {} does not exist", className, classLoader, e);
}
return null;
}
/**
* Is class.
*
* @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) {
return fetchClass(classLoader, classname) != null;
}
/**
* Is it a sub class.
*
* @param parent superclass
* @param presumedSubclass subclass
* @return true if it is a sub class
*/
public static boolean isSubclass(Class<?> parent, Class<?> presumedSubclass) {
return parent.isAssignableFrom(presumedSubclass);
}
}
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