1 /**
2 * This file Copyright (c) 2011 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.guice;
35
36 import java.util.Arrays;
37 import java.util.HashSet;
38 import java.util.Map;
39 import java.util.Set;
40 import java.util.logging.Logger;
41
42 import com.google.inject.AbstractModule;
43 import com.google.inject.Binding;
44 import com.google.inject.Injector;
45 import com.google.inject.Key;
46 import com.google.inject.Provider;
47 import com.google.inject.Stage;
48
49
50 /**
51 * Bridges a Guice Injector to another Injector by adding bindings for all explicit bindings in the injector being
52 * used as parent.
53 *
54 * @version $Id$
55 */
56 public class GuiceParentBindingsModule extends AbstractModule {
57
58 private Injector parentInjector;
59 private Set<Key<?>> excluded = new HashSet<Key<?>>();
60
61 public GuiceParentBindingsModule(Injector parentInjector) {
62 this.parentInjector = parentInjector;
63 exclude(Injector.class, Stage.class, Logger.class);
64 }
65
66 public void exclude(Key<?>... keys) {
67 this.excluded.addAll(Arrays.asList(keys));
68 }
69
70 public void exclude(Class<?>... classes) {
71 for (Class<?> clazz : classes) {
72 this.excluded.add(Key.get(clazz));
73 }
74 }
75
76 @Override
77 protected void configure() {
78
79 Injector injector = parentInjector;
80 do {
81 Map<Key<?>, Binding<?>> explicitBindings = injector.getBindings();
82 for (Map.Entry<Key<?>, Binding<?>> entry : explicitBindings.entrySet()) {
83 Key<?> key = entry.getKey();
84 if (!excluded.contains(key)) {
85 final Provider<?> provider = entry.getValue().getProvider();
86 // We wrap in a nop provider here to hide details like scope
87 bind(key).toProvider(new Provider() {
88 @Override
89 public Object get() {
90 return provider.get();
91 }
92 });
93 }
94 }
95 injector = injector.getParent();
96 } while (injector != null);
97 }
98 }