1 /*
2 * Grapht, an open source dependency injector.
3 * Copyright 2014-2015 various contributors (see CONTRIBUTORS.txt)
4 * Copyright 2010-2014 Regents of the University of Minnesota
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation; either version 2.1 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 51
18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20 package org.grouplens.grapht;
21
22 import org.grouplens.grapht.annotation.DefaultNull;
23 import org.junit.Test;
24
25 import javax.annotation.Nullable;
26 import javax.inject.Inject;
27 import javax.inject.Qualifier;
28 import java.lang.annotation.*;
29
30 import static org.hamcrest.Matchers.*;
31 import static org.junit.Assert.assertThat;
32
33 /**
34 * Tests for <a href="https://github.com/grouplens/grapht/issues/73">#73</a>.
35 *
36 * @author <a href="http://www.grouplens.org">GroupLens Research</a>
37 */
38 public class QualifiedDefaultNullTest {
39 @Test
40 public void testQualifiedDefaultNull() throws InjectionException {
41 InjectorBuilder bld = InjectorBuilder.create();
42 Injector inj = bld.build();
43
44 // With no bindings, we should get a null inner class.
45 MainC main = inj.getInstance(MainC.class);
46 assertThat(main, notNullValue());
47 assertThat(main.dependency, nullValue());
48 }
49
50 @Test
51 public void testQualifiedDefaultNullWithBinding() throws InjectionException {
52 InjectorBuilder bld = InjectorBuilder.create();
53 bld.bind(TestQ.class, DepC.class)
54 .to(DepC.class);
55 Injector inj = bld.build();
56
57 // With a bindings, we should get an instance
58 MainC main = inj.getInstance(MainC.class);
59 assertThat(main, notNullValue());
60 assertThat(main.dependency,
61 allOf(notNullValue(),
62 instanceOf(DepC.class)));
63 }
64
65 /**
66 * Qualifier with default of {@code null}.
67 */
68 @Qualifier
69 @Retention(RetentionPolicy.RUNTIME)
70 @Target(ElementType.PARAMETER)
71 @DefaultNull
72 @Documented
73 public static @interface TestQ {}
74
75 /**
76 * Component with qualified dependency on concrete class.
77 */
78 public static class MainC {
79 private final DepC dependency;
80
81 @Inject
82 public MainC(@Nullable @TestQ DepC dep) {
83 dependency = dep;
84 }
85 }
86
87 public static class DepC {
88 @Inject
89 public DepC() {}
90 }
91 }