| /* |
| * 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 |
| * |
| * https://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.tools.ant.util; |
| |
| import java.lang.reflect.Constructor; |
| |
| /** |
| * Utility class to handle reflection on java objects. |
| * The class is a holder class for an object and |
| * uses java reflection to call methods on the objects. |
| * If things go wrong, BuildExceptions are thrown. |
| */ |
| |
| public class ReflectWrapper { |
| private Object obj; |
| |
| /** |
| * Construct a wrapped object using the no arg constructor. |
| * @param loader the classloader to use to construct the class. |
| * @param name the classname of the object to construct. |
| */ |
| public ReflectWrapper(ClassLoader loader, String name) { |
| try { |
| Class<?> clazz = Class.forName(name, true, loader); |
| Constructor<?> constructor = clazz.getConstructor(); |
| obj = constructor.newInstance(); |
| } catch (Exception t) { |
| ReflectUtil.throwBuildException(t); |
| } |
| } |
| |
| /** |
| * Constructor using a passed in object. |
| * @param obj the object to wrap. |
| */ |
| public ReflectWrapper(Object obj) { |
| this.obj = obj; |
| } |
| |
| /** |
| * @param <T> desired type |
| * @return the wrapped object. |
| */ |
| @SuppressWarnings("unchecked") |
| public <T> T getObject() { |
| return (T) obj; |
| } |
| |
| /** |
| * Call a method on the object with no parameters. |
| * @param <T> desired type |
| * @param methodName the name of the method to call |
| * @return the object returned by the method |
| */ |
| public <T> T invoke(String methodName) { |
| return ReflectUtil.invoke(obj, methodName); |
| } |
| |
| /** |
| * Call a method on the object with one argument. |
| * @param <T> desired type |
| * @param methodName the name of the method to call |
| * @param argType the type of argument. |
| * @param arg the value of the argument. |
| * @return the object returned by the method |
| */ |
| public <T> T invoke(String methodName, Class<?> argType, Object arg) { |
| return ReflectUtil.invoke(obj, methodName, argType, arg); |
| } |
| |
| /** |
| * Call a method on the object with one argument. |
| * @param <T> desired type |
| * @param methodName the name of the method to call |
| * @param argType1 the type of the first argument. |
| * @param arg1 the value of the first argument. |
| * @param argType2 the type of the second argument. |
| * @param arg2 the value of the second argument. |
| * @return the object returned by the method |
| */ |
| public <T> T invoke(String methodName, Class<?> argType1, Object arg1, |
| Class<?> argType2, Object arg2) { |
| return ReflectUtil.invoke(obj, methodName, argType1, arg1, argType2, |
| arg2); |
| } |
| } |