Added support for creating PluginRegistry instances via JavaConfig.

Introduced @EnablePluginRegistries to list the Plugin interfaces the container shall expose PluginRegistry instances for.

core/src/test/java/org/springframework/plugin/core/config/EnablePluginRegistriesIntegrationTest.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 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 org.springframework.plugin.core.config;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.plugin.core.Plugin;
+import org.springframework.plugin.core.PluginRegistry;
+import org.springframework.plugin.core.SamplePlugin;
+import org.springframework.plugin.core.SamplePluginImplementation;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+/**
+ * Integration tests for {@link EnablePluginRegistries}.
+ * 
+ * @author Oliver Gierke
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration
+public class EnablePluginRegistriesIntegrationTest {
+
+	@Configuration
+	@EnablePluginRegistries({ SamplePlugin.class, AnotherPlugin.class })
+	static class Config {
+
+		@Bean
+		public SamplePluginImplementation pluginImpl() {
+			return new SamplePluginImplementation();
+		}
+	}
+
+	@Autowired
+	@Qualifier("samplePluginRegistry")
+	PluginRegistry<SamplePlugin, String> registry;
+
+	@Test
+	public void registersPluginRegistries() {
+		assertThat(registry, is(notNullValue()));
+	}
+
+	interface AnotherPlugin extends Plugin<String> {
+
+	}
+
+	static class AnotherSamplePluginImplementation implements AnotherPlugin {
+
+		@Override
+		public boolean supports(String delimiter) {
+			return true;
+		}
+	}
+}