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/**
* 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.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.inject.util.Modules;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import junit.framework.TestCase;
/**
* @author crazybob@google.com (Bob Lee)
*/
public class GenericInjectionTest extends TestCase {
public void testGenericInjection() throws CreationException {
final List<String> names = Arrays.asList("foo", "bar", "bob");
Injector injector = Guice.createInjector((Module) new AbstractModule() {
protected void configure() {
bind(new TypeLiteral<List<String>>() {}).toInstance(names);
}
});
Foo foo = injector.getInstance(Foo.class);
assertEquals(names, foo.names);
}
static class Foo {
@Inject List<String> names;
}
/**
* Although we may not have intended to support this behaviour, this test
* passes under Guice 1.0. The workaround is to add an explicit binding for
* the parameterized type. See {@link #testExplicitBindingOfGenericType()}.
*/
public void testImplicitBindingOfGenericType() {
Parameterized<String> parameterized
= Guice.createInjector().getInstance(Key.get(new TypeLiteral<Parameterized<String>>() {}));
assertNotNull(parameterized);
}
public void testExplicitBindingOfGenericType() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bind(Key.get(new TypeLiteral<Parameterized<String>>() {}))
.to((Class) Parameterized.class);
}
});
Parameterized<String> parameterized
= injector.getInstance(Key.get(new TypeLiteral<Parameterized<String>>() { }));
assertNotNull(parameterized);
}
static class Parameterized<T> {
@Inject
Parameterized() { }
}
public void testInjectingParameterizedDependenciesForImplicitBinding() {
assertParameterizedDepsInjected(new Key<ParameterizedDeps<String, Integer>>() {},
Modules.EMPTY_MODULE);
}
public void testInjectingParameterizedDependenciesForBindingTarget() {
final TypeLiteral<ParameterizedDeps<String, Integer>> type
= new TypeLiteral<ParameterizedDeps<String, Integer>>() {};
assertParameterizedDepsInjected(Key.get(Object.class), new AbstractModule() {
protected void configure() {
bind(Object.class).to(type);
}
});
}
public void testInjectingParameterizedDependenciesForBindingSource() {
final TypeLiteral<ParameterizedDeps<String, Integer>> type
= new TypeLiteral<ParameterizedDeps<String, Integer>>() {};
assertParameterizedDepsInjected(Key.get(type), new AbstractModule() {
protected void configure() {
bind(type);
}
});
}
public void testBindingToSubtype() {
final TypeLiteral<ParameterizedDeps<String, Integer>> type
= new TypeLiteral<ParameterizedDeps<String, Integer>>() {};
assertParameterizedDepsInjected(Key.get(type), new AbstractModule() {
protected void configure() {
bind(type).to(new TypeLiteral<SubParameterizedDeps<String, Long, Integer>>() {});
}
});
}
public void testBindingSubtype() {
final TypeLiteral<SubParameterizedDeps<String, Long, Integer>> type
= new TypeLiteral<SubParameterizedDeps<String, Long, Integer>>() {};
assertParameterizedDepsInjected(Key.get(type), new AbstractModule() {
protected void configure() {
bind(type);
}
});
}
@SuppressWarnings("unchecked")
public void assertParameterizedDepsInjected(Key<?> key, Module bindingModule) {
Module bindDataModule = new AbstractModule() {
protected void configure() {}
@Provides Map<String, Integer> provideMap() {
return ImmutableMap.of("one", 1, "two", 2);
}
@Provides Set<String> provideSet(Map<String, Integer> map) {
return map.keySet();
}
@Provides Collection<Integer> provideCollection(Map<String, Integer> map) {
return map.values();
}
};
Injector injector = Guice.createInjector(bindDataModule, bindingModule);
ParameterizedDeps<String, Integer> parameterizedDeps
= (ParameterizedDeps<String, Integer>) injector.getInstance(key);
assertEquals(ImmutableMap.of("one", 1, "two", 2), parameterizedDeps.map);
assertEquals(ImmutableSet.of("one", "two"), parameterizedDeps.keys);
assertEquals(ImmutableSet.of(1, 2), ImmutableSet.copyOf(parameterizedDeps.values));
}
static class SubParameterizedDeps<A, B, C> extends ParameterizedDeps<A, C> {
@Inject SubParameterizedDeps(Set<A> keys) {
super(keys);
}
}
static class ParameterizedDeps<K, V> {
@Inject private Map<K, V> map;
private Set<K> keys;
private Collection<V> values;
@Inject ParameterizedDeps(Set<K> keys) {
this.keys = keys;
}
@Inject void method(Collection<V> values) {
this.values = values;
}
}
public void testImmediateTypeVariablesAreInjected() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bind(String.class).toInstance("tee");
}
});
InjectsT<String> injectsT = injector.getInstance(new Key<InjectsT<String>>() {});
assertEquals("tee", injectsT.t);
}
static class InjectsT<T> {
@Inject T t;
}
}
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