@Autowired Map of @components

MapInjectionTests.java

/*
 * Copyright 2002-2012 the original author or authors.
 *
 * 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.acme;

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;


public class MapInjectionTests {
	@Test
	public void test() {
		ApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);
		Foo foo = ctx.getBean(Foo.class);
		assertThat(foo.getPlugins().length, is(2));
		assertThat(foo.getPlugins()[0], instanceOf(PluginB.class));
		assertThat(foo.getPlugins()[1], instanceOf(PluginA.class));
	}
}

@Configuration
@ComponentScan(basePackageClasses=Config.class)
class Config {
	@Autowired Map<String, Plugin> plugins;

	@Bean
	public Foo foo() {
		Foo foo = new Foo();
		foo.addPlugin(plugins.get("pluginB"));
		foo.addPlugin(plugins.get("pluginA"));
		return foo;
	}
}

interface Plugin { }

@Component class PluginA implements Plugin { }
@Component class PluginB implements Plugin { }

class Foo {
	private Set<Plugin> plugins = new LinkedHashSet<Plugin>();

	public void addPlugin(Plugin plugin) {
		this.plugins.add(plugin);
	}

	public Plugin[] getPlugins() {
		return this.plugins.toArray(new Plugin[this.plugins.size()]);
	}
}

written in response to http://forum.springsource.org/showthread.php?122632-Can-you-mix-component-scanning-to-find-beans-with-Java-configuration-for-wiring-them&p=400082#post400082