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/*
* 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.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;
clazz = Class.forName(name, true, loader);
Constructor constructor;
constructor = clazz.getConstructor((Class[]) null);
obj = constructor.newInstance((Object[]) null);
} 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;
}
/**
* @return the wrapped object.
*/
public Object getObject() {
return obj;
}
/**
* Call a method on the object with no parameters.
* @param methodName the name of the method to call
* @return the object returned by the method
*/
public Object invoke(String methodName) {
return ReflectUtil.invoke(obj, methodName);
}
/**
* Call a method on the object with one argument.
* @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 Object invoke(
String methodName, Class argType, Object arg) {
return ReflectUtil.invoke(obj, methodName, argType, arg);
}
/**
* Call a method on the object with one argument.
* @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 Object invoke(
String methodName, Class argType1, Object arg1,
Class argType2, Object arg2) {
return ReflectUtil.invoke(
obj, methodName, argType1, arg1, argType2, arg2);
}
}
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