2 * Copyright 2005-2010 the original author or authors.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 package org.wamblee.inject;
18 import java.util.NoSuchElementException;
19 import java.util.ServiceLoader;
22 * Utility for obtaining an implementation of the {@link InjectorFactory} using
23 * {@link ServiceLoader}.
25 * @author Erik Brakkee
27 public class InjectorFactoryBuilder {
29 private static InjectorFactory FACTORY;
32 * Sets the injector factory. This is useful for testing.
33 * @param aFactory Factory to use.
35 public static void setInjectorFactory(InjectorFactory aFactory) {
40 * Gets the injector factory by using the first one found using
41 * {@link ServiceLoader}.
43 * @return InjectorFactory.
45 public static InjectorFactory getInjectorFactory() {
46 if (FACTORY == null) {
47 FACTORY = findInjectorFactory();
53 * Finds the injector factory musing <code>ServiceLoader</code>
55 * @return InjectorFactory.
57 private static InjectorFactory findInjectorFactory() {
58 ServiceLoader<InjectorFactory> factories = ServiceLoader
59 .load(InjectorFactory.class);
61 return (InjectorFactory) factories.iterator().next();
62 } catch (NoSuchElementException e) {
63 throw new RuntimeException("Can not find InjectorFactory to use");