1 /**
2 * This file Copyright (c) 2011-2015 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 info.magnolia.objectfactory.MgnlInstantiationException;
37 import info.magnolia.objectfactory.ParameterInfo;
38 import info.magnolia.objectfactory.ParameterResolver;
39
40 import java.util.List;
41
42 import com.google.inject.Binding;
43 import com.google.inject.Injector;
44 import com.google.inject.Key;
45 import com.google.inject.TypeLiteral;
46 import com.google.inject.internal.Annotations;
47 import com.google.inject.internal.Errors;
48 import com.google.inject.internal.ErrorsException;
49
50 /**
51 * Parameter resolver that finds parameters by querying for them in a Guice Injector. Will create javax.inject.Provider
52 * instances that match the parameter's type.
53 */
54 public class GuiceParameterResolver implements ParameterResolver {
55
56 private final Injector injector;
57
58 public GuiceParameterResolver(Injector injector) {
59 this.injector = injector;
60 }
61
62 public GuiceParameterResolver(GuiceComponentProvider componentProvider) {
63 this.injector = componentProvider.getInjector();
64 }
65
66 @Override
67 public Object resolveParameter(ParameterInfo parameter) {
68
69 // We ask for an existing binding so Guice wont create jit bindings for things like Class and String
70 // This means that all parameters need to be explicitly bound
71
72 Key<?> key = getKey(parameter);
73 Binding<?> existingBinding = injector.getExistingBinding(key);
74 return existingBinding != null ? existingBinding.getProvider().get() : UNRESOLVED;
75 }
76
77 private Key<?> getKey(ParameterInfo parameter) {
78 try {
79
80 // Get TypeLiteral for this parameter
81 TypeLiteral<?> declaringType = TypeLiteral.get(parameter.getDeclaringClass());
82 List<TypeLiteral<?>> parameterTypes = declaringType.getParameterTypes(parameter.getConstructor());
83 TypeLiteral<?> parameterType = parameterTypes.get(parameter.getParameterIndex());
84
85 // Create Key object for this parameter
86 Errors errors = new Errors(parameter.getConstructor());
87 return Annotations.getKey(
88 parameterType,
89 parameter.getConstructor(),
90 parameter.getParameterAnnotations(),
91 errors);
92
93 } catch (ErrorsException e) {
94 throw new MgnlInstantiationException(e.getMessage(), e);
95 }
96 }
97 }