| /** |
| * 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 com.google.inject.name.Named; |
| import static com.google.inject.name.Names.named; |
| import junit.framework.TestCase; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| |
| /** |
| * @author crazybob@google.com (Bob Lee) |
| */ |
| public class ProviderInjectionTest extends TestCase { |
| |
| public void testProviderInjection() throws CreationException { |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bind(Bar.class); |
| bind(SampleSingleton.class).in(Scopes.SINGLETON); |
| } |
| }); |
| |
| 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 AbstractModule() { |
| public void configure() { |
| // should bind String to "[true]" |
| 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] |
| bind(List.class).toProvider(new Provider<List>() { |
| @Inject Boolean injectedYet = Boolean.FALSE; |
| public List get() { |
| return Arrays.asList(injectedYet); |
| } |
| }); |
| |
| // should bind Boolean to true |
| bind(Boolean.class).toInstance(Boolean.TRUE); |
| } |
| }); |
| |
| assertEquals("Providers not injected before use", |
| "[true]", |
| injector.getInstance(String.class)); |
| } |
| |
| /** |
| * This test ensures that regardless of binding order, instances are injected |
| * before they are used. It injects mutable Count objects and records their |
| * value at the time that they're injected. |
| */ |
| public void testCreationTimeInjectionOrdering() { |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| // instance injection |
| bind(Count.class).annotatedWith(named("a")).toInstance(new Count(0) { |
| @Inject void initialize(@Named("b") Count bCount) { |
| value = bCount.value + 1; |
| } |
| }); |
| |
| // provider injection |
| bind(Count.class).annotatedWith(named("b")).toProvider(new Provider<Count>() { |
| Count count; |
| @Inject void initialize(@Named("c") Count cCount) { |
| count = new Count(cCount.value + 2); |
| } |
| public Count get() { |
| return count; |
| } |
| }); |
| |
| // field and method injection, fields first |
| bind(Count.class).annotatedWith(named("c")).toInstance(new Count(0) { |
| @Inject @Named("d") Count dCount; |
| @Inject void initialize(@Named("e") Count eCount) { |
| value = dCount.value + eCount.value + 4; |
| } |
| }); |
| |
| // static injection |
| requestStaticInjection(StaticallyInjectable.class); |
| |
| bind(Count.class).annotatedWith(named("d")).toInstance(new Count(8)); |
| bind(Count.class).annotatedWith(named("e")).toInstance(new Count(16)); |
| } |
| }); |
| |
| assertEquals(28, injector.getInstance(Key.get(Count.class, named("c"))).value); |
| assertEquals(30, injector.getInstance(Key.get(Count.class, named("b"))).value); |
| assertEquals(31, injector.getInstance(Key.get(Count.class, named("a"))).value); |
| assertEquals(28, StaticallyInjectable.cCountAtInjectionTime); |
| } |
| |
| static class Count { |
| int value; |
| Count(int value) { |
| this.value = value; |
| } |
| } |
| |
| static class StaticallyInjectable { |
| static int cCountAtInjectionTime; |
| @Inject static void initialize(@Named("c") Count cCount) { |
| cCountAtInjectionTime = cCount.value; |
| } |
| } |
| |
| static class Foo { |
| @Inject Provider<Bar> barProvider; |
| @Inject Provider<SampleSingleton> singletonProvider; |
| } |
| |
| static class Bar {} |
| |
| static class SampleSingleton {} |
| |
| interface Baz { } |
| |
| } |