1 /**
2 * This file Copyright (c) 2010-2010 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.objectfactory;
35
36 import org.apache.commons.beanutils.ConstructorUtils;
37
38 import java.lang.reflect.InvocationTargetException;
39 import java.util.Arrays;
40
41 /**
42 * A ClassFactory implementation which uses the default class loader and the thread context class loader.
43 *
44 * @author gjoseph
45 * @version $Revision: $ ($Author: $)
46 */
47 public class DefaultClassFactory implements ClassFactory {
48
49 public <C> Class<C> forName(String className) throws ClassNotFoundException {
50 Class<C> loadedClass;
51 try {
52 loadedClass = (Class<C>) Class.forName(className);
53 } catch (ClassNotFoundException e) {
54 loadedClass = (Class<C>) Class.forName(className, true, Thread.currentThread().getContextClassLoader());
55 }
56 return loadedClass;
57
58 }
59
60 public <T> T newInstance(final Class<T> c, final Class<?>[] argTypes, final Object... params) {
61 if (argTypes.length != params.length) {
62 throw new IllegalStateException("Argument types and values do not match! " + Arrays.asList(argTypes) + " / " + Arrays.asList(params));
63 }
64
65 return newInstance(c, params, new Invoker<T>() {
66 public T invoke() throws InvocationTargetException, NoSuchMethodException, IllegalAccessException, InstantiationException {
67 return (T) ConstructorUtils.invokeConstructor(c, params, argTypes);
68 }
69 });
70 }
71
72 public <T> T newInstance(final Class<T> c, final Object... params) {
73 return newInstance(c, params, new Invoker<T>() {
74 public T invoke() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, InstantiationException {
75 return (T) ConstructorUtils.invokeConstructor(c, params);
76 }
77 });
78 }
79
80 private <T> T newInstance(Class<T> c, Object[] params, Invoker<T> invoker) {
81 // TODO -
82 // c.isAnnotationPresent(Deprecated) - at class or constructor level,
83 // output a warning - todo bis - use a subclass of java.lang.Deprecated which allows a message
84
85 try {
86 if (params == null || params.length == 0) {
87 // shortcut
88 return c.newInstance();
89 }
90
91 // org.apache.commons.beanutils.ConstructorUtils#getMatchingAccessibleConstructor is private,
92 // otherwise, we'd simply extract a getConstructor() method to implement our 2 newInstance() methods.
93 return invoker.invoke();
94
95 } catch (NoSuchMethodException e) {
96 throw new MgnlInstantiationException(e.getMessage(), e);
97 } catch (IllegalAccessException e) {
98 throw new MgnlInstantiationException(e.getMessage(), e);
99 } catch (InvocationTargetException e) {
100 throw new MgnlInstantiationException(e.getMessage(), e);
101 } catch (InstantiationException e) {
102 throw new MgnlInstantiationException(e.getMessage(), e);
103 }
104 }
105
106 private static interface Invoker<T> {
107 T invoke() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, InstantiationException;
108 }
109
110 }