| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| package org.apache.gossip.utils; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| |
| public class ReflectionUtils { |
| |
| /** |
| * Create an instance of a thing. This method essentially makes code more readable by handing the various exception |
| * trapping. |
| * @param className |
| * @param constructorTypes |
| * @param constructorArgs |
| * @param <T> |
| * @return constructed instance of a thing. |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> T constructWithReflection(String className, Class<?>[] constructorTypes, Object[] constructorArgs) { |
| try { |
| Constructor<?> c = Class.forName(className).getConstructor(constructorTypes); |
| c.setAccessible(true); |
| return (T) c.newInstance(constructorArgs); |
| } catch (InvocationTargetException e) { |
| // catch ITE and throw the target if it is a RTE. |
| if (e.getTargetException() != null && RuntimeException.class.isAssignableFrom(e.getTargetException().getClass())) { |
| throw (RuntimeException) e.getTargetException(); |
| } else { |
| throw new RuntimeException(e); |
| } |
| } catch (ReflectiveOperationException others) { |
| // Note: No class in the above list should be a descendent of RuntimeException. Otherwise, we're just wrapping |
| // and making stack traces confusing. |
| throw new RuntimeException(others); |
| } |
| } |
| } |