01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: */
18: package org.apache.tools.ant.util;
19:
20: import java.lang.reflect.Constructor;
21:
22: /**
23: * Utility class to handle reflection on java objects.
24: * The class is a holder class for an object and
25: * uses java reflection to call methods on the objects.
26: * If things go wrong, BuildExceptions are thrown.
27: */
28:
29: public class ReflectWrapper {
30: private Object obj;
31:
32: /**
33: * Construct a wrapped object using the no arg constructor.
34: * @param loader the classloader to use to construct the class.
35: * @param name the classname of the object to construct.
36: */
37: public ReflectWrapper(ClassLoader loader, String name) {
38: try {
39: Class clazz;
40: clazz = Class.forName(name, true, loader);
41: Constructor constructor;
42: constructor = clazz.getConstructor((Class[]) null);
43: obj = constructor.newInstance((Object[]) null);
44: } catch (Exception t) {
45: ReflectUtil.throwBuildException(t);
46: }
47: }
48:
49: /**
50: * Constructor using a passed in object.
51: * @param obj the object to wrap.
52: */
53: public ReflectWrapper(Object obj) {
54: this .obj = obj;
55: }
56:
57: /**
58: * @return the wrapped object.
59: */
60: public Object getObject() {
61: return obj;
62: }
63:
64: /**
65: * Call a method on the object with no parameters.
66: * @param methodName the name of the method to call
67: * @return the object returned by the method
68: */
69: public Object invoke(String methodName) {
70: return ReflectUtil.invoke(obj, methodName);
71: }
72:
73: /**
74: * Call a method on the object with one argument.
75: * @param methodName the name of the method to call
76: * @param argType the type of argument.
77: * @param arg the value of the argument.
78: * @return the object returned by the method
79: */
80: public Object invoke(String methodName, Class argType, Object arg) {
81: return ReflectUtil.invoke(obj, methodName, argType, arg);
82: }
83:
84: /**
85: * Call a method on the object with one argument.
86: * @param methodName the name of the method to call
87: * @param argType1 the type of the first argument.
88: * @param arg1 the value of the first argument.
89: * @param argType2 the type of the second argument.
90: * @param arg2 the value of the second argument.
91: * @return the object returned by the method
92: */
93: public Object invoke(String methodName, Class argType1,
94: Object arg1, Class argType2, Object arg2) {
95: return ReflectUtil.invoke(obj, methodName, argType1, arg1,
96: argType2, arg2);
97: }
98: }
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