1 files changed, 88 insertions, 0 deletions
diff --git a/policy-utils/src/main/java/org/onap/policy/drools/utils/ReflectionUtil.java b/policy-utils/src/main/java/org/onap/policy/drools/utils/ReflectionUtil.java
new file mode 100644
index 00000000..eeb7f1f6
--- /dev/null
+++ b/policy-utils/src/main/java/org/onap/policy/drools/utils/ReflectionUtil.java
@@ -0,0 +1,88 @@
+/*-
+ * ============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.onap.policy.drools.utils;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+/**
+ * Reflection utilities
+ *
+ */
+public class ReflectionUtil {
+	
+	protected final static 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) 
+		throws IllegalArgumentException {
+		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) {
+			logger.error("FETCHED-CLASS {} IN {} does NOT EXIST", className, classLoader);
+		}
+		
+		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) {		
+		return (parent.isAssignableFrom(presumedSubclass));
+	}
+
+}