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 /** @author crazybob@google.com (Bob Lee) */ 22 public class BoundProviderTest extends TestCase { 23 testFooProvider()24 public void testFooProvider() throws CreationException { 25 Injector injector = 26 Guice.createInjector( 27 new AbstractModule() { 28 @Override 29 protected void configure() { 30 bind(Foo.class).toProvider(FooProvider.class); 31 } 32 }); 33 34 Foo a = injector.getInstance(Foo.class); 35 Foo b = injector.getInstance(Foo.class); 36 37 assertEquals(0, a.i); 38 assertEquals(0, b.i); 39 assertNotNull(a.bar); 40 assertNotNull(b.bar); 41 assertNotSame(a.bar, b.bar); 42 } 43 testSingletonFooProvider()44 public void testSingletonFooProvider() throws CreationException { 45 Injector injector = 46 Guice.createInjector( 47 new AbstractModule() { 48 @Override 49 protected void configure() { 50 bind(Foo.class).toProvider(SingletonFooProvider.class); 51 } 52 }); 53 54 Foo a = injector.getInstance(Foo.class); 55 Foo b = injector.getInstance(Foo.class); 56 57 assertEquals(0, a.i); 58 assertEquals(1, b.i); 59 assertNotNull(a.bar); 60 assertNotNull(b.bar); 61 assertSame(a.bar, b.bar); 62 } 63 64 static class Bar {} 65 66 static class Foo { 67 final Bar bar; 68 final int i; 69 Foo(Bar bar, int i)70 Foo(Bar bar, int i) { 71 this.bar = bar; 72 this.i = i; 73 } 74 } 75 76 static class FooProvider implements Provider<Foo> { 77 78 final Bar bar; 79 int count = 0; 80 81 @Inject FooProvider(Bar bar)82 public FooProvider(Bar bar) { 83 this.bar = bar; 84 } 85 86 @Override get()87 public Foo get() { 88 return new Foo(this.bar, count++); 89 } 90 } 91 92 @Singleton 93 static class SingletonFooProvider implements Provider<Foo> { 94 95 final Bar bar; 96 int count = 0; 97 98 @Inject SingletonFooProvider(Bar bar)99 public SingletonFooProvider(Bar bar) { 100 this.bar = bar; 101 } 102 103 @Override get()104 public Foo get() { 105 return new Foo(this.bar, count++); 106 } 107 } 108 } 109