1 /** 2 * Copyright (C) 2006 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject; 18 19 import junit.framework.TestCase; 20 21 /** 22 * @author crazybob (at) google.com (Bob Lee) 23 */ 24 public class BoundProviderTest extends TestCase { 25 26 public void testFooProvider() throws CreationException { 27 Injector injector = Guice.createInjector(new AbstractModule() { 28 protected void configure() { 29 bind(Foo.class).toProvider(FooProvider.class); 30 } 31 }); 32 33 Foo a = injector.getInstance(Foo.class); 34 Foo b = injector.getInstance(Foo.class); 35 36 assertEquals(0, a.i); 37 assertEquals(0, b.i); 38 assertNotNull(a.bar); 39 assertNotNull(b.bar); 40 assertNotSame(a.bar, b.bar); 41 } 42 43 public void testSingletonFooProvider() throws CreationException { 44 Injector injector = Guice.createInjector(new AbstractModule() { 45 protected void configure() { 46 bind(Foo.class).toProvider(SingletonFooProvider.class); 47 } 48 }); 49 50 Foo a = injector.getInstance(Foo.class); 51 Foo b = injector.getInstance(Foo.class); 52 53 assertEquals(0, a.i); 54 assertEquals(1, b.i); 55 assertNotNull(a.bar); 56 assertNotNull(b.bar); 57 assertSame(a.bar, b.bar); 58 } 59 60 static class Bar {} 61 62 static class Foo { 63 final Bar bar; 64 final int i; 65 66 Foo(Bar bar, int i) { 67 this.bar = bar; 68 this.i = i; 69 } 70 } 71 72 static class FooProvider implements Provider<Foo> { 73 74 final Bar bar; 75 int count = 0; 76 77 @Inject 78 public FooProvider(Bar bar) { 79 this.bar = bar; 80 } 81 82 public Foo get() { 83 return new Foo(this.bar, count++); 84 } 85 } 86 87 @Singleton 88 static class SingletonFooProvider implements Provider<Foo> { 89 90 final Bar bar; 91 int count = 0; 92 93 @Inject 94 public SingletonFooProvider(Bar bar) { 95 this.bar = bar; 96 } 97 98 public Foo get() { 99 return new Foo(this.bar, count++); 100 } 101 } 102 } 103
