| /** |
| * Copyright (C) 2006 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.inject; |
| |
| import junit.framework.TestCase; |
| import java.util.List; |
| import java.util.Arrays; |
| import static java.util.Collections.emptySet; |
| |
| /** |
| * @author crazybob@google.com (Bob Lee) |
| */ |
| public class ProviderInjectionTest extends TestCase { |
| |
| public void testProviderInjection() throws CreationException { |
| BinderImpl builder = new BinderImpl(); |
| |
| builder.bind(Bar.class); |
| builder.bind(SampleSingleton.class).in(Scopes.SINGLETON); |
| |
| Injector injector = builder.createInjector(); |
| |
| Foo foo = injector.getInstance(Foo.class); |
| |
| Bar bar = foo.barProvider.get(); |
| assertNotNull(bar); |
| assertNotSame(bar, foo.barProvider.get()); |
| |
| SampleSingleton singleton = foo.singletonProvider.get(); |
| assertNotNull(singleton); |
| assertSame(singleton, foo.singletonProvider.get()); |
| } |
| |
| /** Test for bug 155. */ |
| public void testProvidersAreInjectedWhenBound() { |
| Module m = new AbstractModule() { |
| @Override |
| protected void configure() { |
| bind(Bar.class).toProvider(new Provider<Bar>() { |
| @SuppressWarnings("unused") |
| @Inject void cantBeCalled(Baz baz) { |
| fail("Can't have called this method since Baz is not bound."); |
| } |
| public Bar get() { |
| return new Bar() {}; |
| } |
| }); |
| } |
| }; |
| |
| try { |
| Guice.createInjector(m); |
| fail("Should have thrown a CreationException"); |
| } |
| catch (CreationException expected) { |
| } |
| } |
| |
| /** |
| * When custom providers are used at injector creation time, they should be |
| * injected before use. In this testcase, we verify that a provider for |
| * List.class is injected before it is used. |
| */ |
| public void testProvidersAreInjectedBeforeTheyAreUsed() { |
| Injector injector = Guice.createInjector(new Module() { |
| public void configure(Binder binder) { |
| // should bind String to "[true]" |
| binder.bind(String.class).toProvider(new Provider<String>() { |
| private String value; |
| @Inject void initialize(List list) { |
| value = list.toString(); |
| } |
| public String get() { |
| return value; |
| } |
| }); |
| |
| // should bind List to [true] |
| binder.bind(List.class).toProvider(new Provider<List>() { |
| @Inject Boolean injectedYet = Boolean.FALSE; |
| public List get() { |
| return Arrays.asList(injectedYet); |
| } |
| }); |
| |
| // should bind Boolean to true |
| binder.bind(Boolean.class).toInstance(Boolean.TRUE); |
| } |
| }); |
| |
| assertEquals("Providers not injected before use", |
| "[true]", |
| injector.getInstance(String.class)); |
| } |
| |
| static class Foo { |
| @Inject Provider<Bar> barProvider; |
| @Inject Provider<SampleSingleton> singletonProvider; |
| } |
| |
| static class Bar {} |
| |
| static class SampleSingleton {} |
| |
| interface Baz { } |
| |
| } |