Support multi-profile YAML in application-* files

Update ConfigFileEnvironmentPostProcessor to load profile specific
sections for all previously processed profiles. Prior to this commit
multi-profile YAML files were only loaded from the root
`application.yml` file.

With the updated logic, an `application-test.yml` file containing the
following:

	someTestProperty: xyz
	---
	spring:
	  profiles: profile1
	  specificProperty: one

Can have the profile sub-document loaded using:

	-Dspring.profiles.active=test,profile1

Fixes gh-4132

spring-boot/src/main/java/org/springframework/boot/context/config/ConfigFileEnvironmentPostProcessor.java

@@ -277,6 +277,8 @@ private class Loader {
 
 		private Queue<String> profiles;
 
+		private List<String> processedProfiles;
+
 		private boolean activatedProfiles;
 
 		Loader(ConfigurableEnvironment environment, ResourceLoader resourceLoader) {
@@ -288,6 +290,7 @@ private class Loader {
 		public void load() throws IOException {
 			this.propertiesLoader = new PropertySourcesLoader();
 			this.profiles = Collections.asLifoQueue(new LinkedList<String>());
+			this.processedProfiles = new LinkedList<String>();
 			this.activatedProfiles = false;
 			if (this.environment.containsProperty(ACTIVE_PROFILES_PROPERTY)) {
 				// Any pre-existing active profiles set via property sources (e.g. System
@@ -334,6 +337,7 @@ public void load() throws IOException {
 						}
 					}
 				}
+				this.processedProfiles.add(profile);
 			}
 
 			addConfigurationProperties(this.propertiesLoader.getPropertySources());
@@ -353,6 +357,12 @@ private void load(String location, String name, String profile)
 						// Try the profile specific file
 						loadIntoGroup(group, location + name + "-" + profile + "." + ext,
 								null);
+						for (String processedProfile : this.processedProfiles) {
+							if (processedProfile != null) {
+								loadIntoGroup(group, location + name + "-"
+										+ processedProfile + "." + ext, profile);
+							}
+						}
 						// Sometimes people put "spring.profiles: dev" in
 						// application-dev.yml (gh-340). Arguably we should try and error
 						// out on that, but we can be kind and load it anyway.
@@ -412,7 +422,6 @@ private void maybeActivateProfiles(Object value) {
 				}
 				return;
 			}
-
 			Set<String> profiles = getProfilesForValue(value);
 			activateProfiles(profiles);
 			if (profiles.size() > 0) {

spring-boot/src/test/java/org/springframework/boot/context/config/ConfigFileEnvironmentPostProcessorTests.java

@@ -609,7 +609,7 @@ public void activateProfileFromProfileSpecificProperties() throws Exception {
 	}
 
 	@Test
-	public void profileSubDocumentInProfileSpecificFile() throws Exception {
+	public void profileSubDocumentInSameProfileSpecificFile() throws Exception {
 		// gh-340
 		SpringApplication application = new SpringApplication(Config.class);
 		application.setWebEnvironment(false);
@@ -639,6 +639,17 @@ public void bindsSystemPropertyToSpringApplication() throws Exception {
 		assertThat((Banner.Mode) field.get(this.application), equalTo(Banner.Mode.OFF));
 	}
 
+	@Test
+	public void profileSubDocumentInDifferentProfileSpecificFile() throws Exception {
+		// gh-4132
+		SpringApplication application = new SpringApplication(Config.class);
+		application.setWebEnvironment(false);
+		this.context = application.run(
+				"--spring.profiles.active=activeprofilewithdifferentsubdoc,activeprofilewithdifferentsubdoc2");
+		String property = this.context.getEnvironment().getProperty("foobar");
+		assertThat(property, equalTo("baz"));
+	}
+
 	private static Matcher<? super ConfigurableEnvironment> containsPropertySource(
 			final String sourceName) {
 		return new TypeSafeDiagnosingMatcher<ConfigurableEnvironment>() {

spring-boot/src/test/resources/application-activeprofilewithdifferentsubdoc.yml

@@ -0,0 +1,4 @@
+---
+spring.profiles: activeprofilewithdifferentsubdoc2
+foobar: baz
+---