01: /*
02: * Copyright (c) 1998-2002 Carnegie Mellon University. All rights
03: * reserved.
04: *
05: * Redistribution and use in source and binary forms, with or without
06: * modification, are permitted provided that the following conditions
07: * are met:
08: *
09: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: *
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in
14: * the documentation and/or other materials provided with the
15: * distribution.
16: *
17: * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
18: * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19: * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
21: * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28: *
29: */
30:
31: package rcm.util;
32:
33: import java.lang.reflect.*;
34:
35: /**
36: * Handy reflection routines.
37: */
38: public abstract class Reflect {
39: /**
40: * Create a new instance of a class by calling a constructor with
41: * arguments.
42: */
43: public static Object newInstance(String className,
44: Class[] signature, Object[] args) throws Exception {
45:
46: Class cls = Class.forName(className);
47: Constructor constructor = cls.getConstructor(signature);
48: return constructor.newInstance(args);
49: }
50:
51: /**
52: * Call a method of an object.
53: */
54: public static Object callMethod(Object obj, String methodName,
55: Class[] signature, Object[] args) throws Exception {
56:
57: Class cls = obj.getClass();
58: Method method = cls.getMethod(methodName, signature);
59: return method.invoke(obj, args);
60: }
61:
62: /**
63: * Call a static method of a class.
64: */
65: public static Object callStaticMethod(String className,
66: String methodName, Class[] signature, Object[] args)
67: throws Exception {
68:
69: Class cls = Class.forName(className);
70: Method method = cls.getMethod(methodName, signature);
71: return method.invoke(cls, args);
72: }
73: }
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