Add auto-configuration for Spring Cloud

Enable if all of the following are true:
- spring-cloud is on the classpath
- There is no Cloud bean present
  (usually done by extending AbstractCloudConfig)
- The "cloud" profile is active

Fixes gh-1302

Autoconfigure spring-cloud

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/TestAutoConfigurationSorter.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2014 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.boot.autoconfigure;
+
+import org.springframework.core.io.ResourceLoader;
+
+/**
+ * Public version of {@link AutoConfigurationSorter} for use in tests.
+ *
+ * @author Phillip Webb
+ */
+public class TestAutoConfigurationSorter extends AutoConfigurationSorter {
+
+	public TestAutoConfigurationSorter(ResourceLoader resourceLoader) {
+		super(resourceLoader);
+	}
+
+}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cloud/CloudAutoConfigurationTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2014 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.boot.autoconfigure.cloud;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.junit.Test;
+import org.springframework.boot.autoconfigure.TestAutoConfigurationSorter;
+import org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
+import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.ResourceLoader;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link CloudAutoConfiguration}.
+ *
+ * @author Phillip Webb
+ */
+public class CloudAutoConfigurationTests {
+
+	@Test
+	public void testOrder() throws Exception {
+		ResourceLoader loader = new DefaultResourceLoader();
+		TestAutoConfigurationSorter sorter = new TestAutoConfigurationSorter(loader);
+		Collection<String> classNames = new ArrayList<String>();
+		classNames.add(MongoAutoConfiguration.class.getName());
+		classNames.add(DataSourceAutoConfiguration.class.getName());
+		classNames.add(MongoRepositoriesAutoConfiguration.class.getName());
+		classNames.add(JpaRepositoriesAutoConfiguration.class.getName());
+		classNames.add(CloudAutoConfiguration.class.getName());
+		List<String> ordered = sorter.getInPriorityOrder(classNames);
+		assertThat(ordered.get(0), equalTo(CloudAutoConfiguration.class.getName()));
+	}
+
+}