01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.db4ounit.common.migration;
22:
23: import java.io.*;
24: import java.lang.reflect.*;
25: import java.net.*;
26:
27: import com.db4o.db4ounit.util.*;
28:
29: /**
30: * @sharpen.ignore
31: */
32: public class Db4oLibraryEnvironment {
33:
34: private final static String[] PREFIXES = { "com.db4o" };
35: private final ClassLoader _loader;
36:
37: public Db4oLibraryEnvironment(File db4oLibrary,
38: File additionalClassPath) throws IOException {
39: _loader = new VersionClassLoader(urls(db4oLibrary,
40: additionalClassPath), PREFIXES);
41: }
42:
43: private URL[] urls(File db4oLibrary, File additionalClassPath)
44: throws MalformedURLException {
45: return new URL[] { db4oLibrary.toURL(),
46: additionalClassPath.toURL() };
47: }
48:
49: public String version() throws Exception {
50: String version = (String) invokeStaticMethod("com.db4o.Db4o",
51: "version");
52: return version.substring(5);
53: }
54:
55: private Object invokeStaticMethod(String className,
56: String methodName) throws Exception {
57: Class clazz = _loader.loadClass(className);
58: Method method = clazz.getMethod(methodName, new Class[] {});
59: return method.invoke(null, new Object[] {});
60: }
61:
62: public Object invokeInstanceMethod(Class klass, String methodName,
63: Object[] args) throws Exception {
64: Class clazz = _loader.loadClass(klass.getName());
65: Method method = clazz.getMethod(methodName, classes(args));
66: return method.invoke(clazz.newInstance(), args);
67: }
68:
69: private Class[] classes(Object[] args) {
70: Class[] classes = new Class[args.length];
71: for (int i = 0; i < args.length; ++i) {
72: classes[i] = args[i].getClass();
73: }
74: return classes;
75: }
76: }
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