Restore active profile logic and support `+`

Restore the previous `spring.profiles.active` logic effectively
reverting commit 37069d9. This ensures that active profiles defined in
a higher `PropertySource` replace those lower down.

In addition, add support for a `+` prefix that can be used to indicate
that a profile should be added to the active set.

For example:

	# application-prod.properties
	spring.profiles.active=+proddb,+prodmq

Fixed gh-308, gh-309

docs/howto.md

@@ -894,7 +894,7 @@ In Spring Boot you can also set the active profile in
 `application.properties`, e.g.
 
 ```properties
-spring.profiles.active: production
+spring.profiles.active=production
 ```
 
 A value set this way is replaced by the System property or environment
@@ -902,6 +902,7 @@ variable setting, but not by the `SpringApplicationBuilder.profiles()`
 method. Thus the latter Java API can be used to augment the profiles
 without changing the defaults.
 
+
 ## Change the Location of External Properties of an Application
 
 By default properties from different sources are added to the Spring

spring-boot/README.md

@@ -157,6 +157,26 @@ spring.profiles.active=dev,hsqldb
 
 or specify on the command line using the switch `--spring.profiles.active=dev,hsqldb`.
 
+#### Adding active profiles
+The `spring.profiles.active` property follows the same ordering rules as other
+properties, the highest `PropertySource` will win. This means that you can specify
+active profiles in `application.properties` then **replace** them using the command line
+switch.
+
+Sometimes it is useful to have profile specific properties that **add** to the active
+profiles rather than replace them. The `+` prefix can be used to add active profiles.
+
+For example, when an application with following properties is run using the switch
+`--spring.profiles.active=prod` the `proddb` and `prodmq` profiles will also be activated:
+
+```yaml
+---
+my.property: fromyamlfile
+---
+spring.profiles: prod
+spring.profiles.active: +proddb,+prodmq
+```
+
 ### Application Context Initializers
 Spring provides a convenient `ApplicationContextInitializer` interface that can be used
 to customize an `ApplicationContext` before it is used. If you need to use an initializer
@@ -451,7 +471,7 @@ to specify:
 * The Tomcat `base directory` (`server.tomcat.basedir`)
 
 ## Customizing Logging
-Spring Boot uses [Commons Logging](commons.apache.org/logging/‎) for all internal logging,
+Spring Boot uses [Commons Logging](commons.apache.org/logging) for all internal logging,
 but leaves the underlying log implementation open. Default configurations are provided for
 [Java Util Logging](http://docs.oracle.com/javase/7/docs/api/java/util/logging/package-summary.html),
 [Log4J](http://logging.apache.org/log4j/) and [Logback](http://logback.qos.ch/).

spring-boot/src/main/java/org/springframework/boot/context/listener/ConfigFileApplicationListener.java

@@ -147,15 +147,24 @@ public class ConfigFileApplicationListener implements
 		PropertySource<?> defaultProperties = environment.getPropertySources().remove(
 				"defaultProperties");
 
-		addActiveProfiles(environment);
+		// Load to allow a file that defines active profiles to be considered
 		String firstPropertySourceName = loadInitial(environment, resourceLoader,
 				candidates);
 
+		// Apply the active profiles (if any) from the first property source
+		if (environment.containsProperty(ACTIVE_PROFILES_PROPERTY)) {
+			activeProfilesFromProperty(environment,
+					environment.getProperty(ACTIVE_PROFILES_PROPERTY), true);
+		}
+
+		// Apply any profile additions from any source
+		activeProfileAdditionsFromAnySource(environment);
+
 		// Repeatedly load property sources in case additional profiles are activated
 		int numberOfPropertySources;
 		do {
 			numberOfPropertySources = environment.getPropertySources().size();
-			addActiveProfiles(environment);
+			activeProfileAdditionsFromAnySource(environment);
 			loadAgain(environment, resourceLoader, candidates, firstPropertySourceName);
 		}
 		while (environment.getPropertySources().size() > numberOfPropertySources);
@@ -165,17 +174,22 @@ public class ConfigFileApplicationListener implements
 		}
 	}
 
-	/**
-	 * @param environment
-	 */
-	private void addActiveProfiles(ConfigurableEnvironment environment) {
+	private void activeProfileAdditionsFromAnySource(ConfigurableEnvironment environment) {
 		for (PropertySource<?> propertySource : environment.getPropertySources()) {
 			if (propertySource.containsProperty(ACTIVE_PROFILES_PROPERTY)) {
-				Object profiles = propertySource.getProperty(ACTIVE_PROFILES_PROPERTY);
-				for (String profile : StringUtils.commaDelimitedListToSet(profiles
-						.toString())) {
-					environment.addActiveProfile(profile);
-				}
+				activeProfilesFromProperty(environment,
+						propertySource.getProperty(ACTIVE_PROFILES_PROPERTY), false);
+			}
+		}
+	}
+
+	private void activeProfilesFromProperty(ConfigurableEnvironment environment,
+			Object property, boolean addAll) {
+		for (String profile : StringUtils.commaDelimitedListToSet(property.toString())) {
+			boolean addition = profile.startsWith("+");
+			profile = (addition ? profile.substring(1) : profile);
+			if (addAll || addition) {
+				environment.addActiveProfile(profile);
 			}
 		}
 	}

spring-boot/src/test/java/org/springframework/boot/context/listener/ConfigFileApplicationListenerTests.java

@@ -186,8 +186,7 @@ public class ConfigFileApplicationListenerTests {
 				"spring.profiles.active:prod");
 		this.initializer.setNames("testsetprofiles");
 		this.initializer.onApplicationEvent(this.event);
-		assertThat(this.environment.getActiveProfiles(), equalTo(new String[] { "prod",
-				"dev" }));
+		assertThat(this.environment.getActiveProfiles(), equalTo(new String[] { "prod" }));
 	}
 
 	@Test
@@ -356,6 +355,11 @@ public class ConfigFileApplicationListenerTests {
 		assertThat(context.getEnvironment().acceptsProfiles("activateprofile"),
 				equalTo(true));
 		assertThat(context.getEnvironment().acceptsProfiles("specific"), equalTo(true));
+		assertThat(context.getEnvironment().acceptsProfiles("morespecific"),
+				equalTo(true));
+		assertThat(context.getEnvironment().acceptsProfiles("yetmorespecific"),
+				equalTo(true));
+		assertThat(context.getEnvironment().acceptsProfiles("missing"), equalTo(false));
 	}
 
 	@Test

spring-boot/src/test/resources/application-activateprofile.properties

@@ -1 +1 @@
-spring.profiles.active=specific
+spring.profiles.active=+specific

spring-boot/src/test/resources/application-morespecific.properties

@@ -0,0 +1 @@
+spring.profiles.active=+yetmorespecific,missing

spring-boot/src/test/resources/application-specific.properties

@@ -0,0 +1 @@
+spring.profiles.active=+morespecific

spring-boot/src/test/resources/enableprofileviaapplicationproperties.yml

@@ -1,3 +1,3 @@
 spring:
   profiles:
-    active: a
+    active: +a