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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.example;
import static junit.framework.Assert.assertTrue;
/** @author crazybob@google.com (Bob Lee) */
public class ClientServiceWithDependencyInjection {
// 62 lines
public interface Service {
void go();
}
public static class ServiceImpl implements ClientServiceWithDependencyInjection.Service {
@Override
public void go() {
// ...
}
}
public static class ServiceFactory {
private ServiceFactory() {}
private static final Service service = new ServiceImpl();
public static Service getInstance() {
return service;
}
}
public static class Client {
private final Service service;
public Client(Service service) {
this.service = service;
}
public void go() {
service.go();
}
}
public static class ClientFactory {
private ClientFactory() {}
public static Client getInstance() {
Service service = ServiceFactory.getInstance();
return new Client(service);
}
}
public void testClient() {
MockService mock = new MockService();
Client client = new Client(mock);
client.go();
assertTrue(mock.isGone());
}
public static class MockService implements Service {
private boolean gone = false;
@Override
public void go() {
gone = true;
}
public boolean isGone() {
return gone;
}
}
public static void main(String[] args) {
new ClientServiceWithDependencyInjection().testClient();
}
}
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