Fix source detection in case of multiple candidates

This commit improves the detection of a property source when more than
one group with the same type exist.

Closes gh-16549

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/main/java/org/springframework/boot/configurationmetadata/ConfigurationMetadataRepositoryJsonBuilder.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -108,7 +108,7 @@ public final class ConfigurationMetadataRepositoryJsonBuilder {
 		SimpleConfigurationMetadataRepository repository = new SimpleConfigurationMetadataRepository();
 		repository.add(metadata.getSources());
 		for (ConfigurationMetadataItem item : metadata.getItems()) {
-			ConfigurationMetadataSource source = getSource(metadata, item);
+			ConfigurationMetadataSource source = metadata.getSource(item);
 			repository.add(item, source);
 		}
 		Map<String, ConfigurationMetadataProperty> allProperties = repository
@@ -146,14 +146,6 @@ public final class ConfigurationMetadataRepositoryJsonBuilder {
 		property.getHints().getKeyProviders().addAll(hint.getValueProviders());
 	}
 
-	private ConfigurationMetadataSource getSource(RawConfigurationMetadata metadata,
-			ConfigurationMetadataItem item) {
-		if (item.getSourceType() != null) {
-			return metadata.getSource(item.getSourceType());
-		}
-		return null;
-	}
-
 	/**
 	 * Create a new builder instance using {@link StandardCharsets#UTF_8} as the default
 	 * charset and the specified json resource.

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/main/java/org/springframework/boot/configurationmetadata/RawConfigurationMetadata.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -17,6 +17,7 @@
 package org.springframework.boot.configurationmetadata;
 
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 
 /**
@@ -48,13 +49,16 @@ class RawConfigurationMetadata {
 		return this.sources;
 	}
 
-	public ConfigurationMetadataSource getSource(String type) {
-		for (ConfigurationMetadataSource source : this.sources) {
-			if (type.equals(source.getType())) {
-				return source;
-			}
+	public ConfigurationMetadataSource getSource(ConfigurationMetadataItem item) {
+		if (item.getSourceType() == null) {
+			return null;
 		}
-		return null;
+		return this.sources.stream()
+				.filter((candidate) -> item.getSourceType().equals(candidate.getType())
+						&& item.getId().startsWith(candidate.getGroupId()))
+				.max(Comparator
+						.comparingInt((candidate) -> candidate.getGroupId().length()))
+				.orElse(null);
 	}
 
 	public List<ConfigurationMetadataItem> getItems() {
@@ -72,10 +76,7 @@ class RawConfigurationMetadata {
 	 */
 	private void resolveName(ConfigurationMetadataItem item) {
 		item.setName(item.getId()); // fallback
-		if (item.getSourceType() == null) {
-			return;
-		}
-		ConfigurationMetadataSource source = getSource(item.getSourceType());
+		ConfigurationMetadataSource source = getSource(item);
 		if (source != null) {
 			String groupId = source.getGroupId();
 			String dottedPrefix = groupId + ".";

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/test/java/org/springframework/boot/configurationmetadata/ConfigurationMetadataRepositoryJsonBuilderTests.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -129,6 +129,31 @@ public class ConfigurationMetadataRepositoryJsonBuilderTests
 		}
 	}
 
+	@Test
+	public void multiGroups() throws IOException {
+		try (InputStream in = getInputStreamFor("multi-groups")) {
+			ConfigurationMetadataRepository repo = ConfigurationMetadataRepositoryJsonBuilder
+					.create(in).build();
+			assertThat(repo.getAllGroups()).containsOnlyKeys("test.group.one.retry",
+					"test.group.two.retry", "test.group.one.retry.specific");
+			ConfigurationMetadataGroup one = repo.getAllGroups()
+					.get("test.group.one.retry");
+			assertThat(one.getSources()).containsOnlyKeys("com.example.Retry");
+			assertThat(one.getProperties())
+					.containsOnlyKeys("test.group.one.retry.enabled");
+			ConfigurationMetadataGroup two = repo.getAllGroups()
+					.get("test.group.two.retry");
+			assertThat(two.getSources()).containsOnlyKeys("com.example.Retry");
+			assertThat(two.getProperties())
+					.containsOnlyKeys("test.group.two.retry.enabled");
+			ConfigurationMetadataGroup oneSpecific = repo.getAllGroups()
+					.get("test.group.one.retry.specific");
+			assertThat(oneSpecific.getSources()).containsOnlyKeys("com.example.Retry");
+			assertThat(oneSpecific.getProperties())
+					.containsOnlyKeys("test.group.one.retry.specific.enabled");
+		}
+	}
+
 	@Test
 	public void builderInstancesAreIsolated() throws IOException {
 		try (InputStream foo = getInputStreamFor("foo");

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/test/java/org/springframework/boot/configurationmetadata/JsonReaderTests.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -199,6 +199,25 @@ public class JsonReaderTests extends AbstractConfigurationMetadataTests {
 				.isEqualTo(Deprecation.Level.WARNING);
 	}
 
+	@Test
+	public void multiGroupsMetadata() throws IOException {
+		RawConfigurationMetadata rawMetadata = readFor("multi-groups");
+		List<ConfigurationMetadataItem> items = rawMetadata.getItems();
+		assertThat(items).hasSize(3);
+
+		ConfigurationMetadataItem item = items.get(0);
+		assertThat(item.getName()).isEqualTo("enabled");
+		assertThat(item.getSourceType()).isEqualTo("com.example.Retry");
+
+		ConfigurationMetadataItem item2 = items.get(1);
+		assertThat(item2.getName()).isEqualTo("enabled");
+		assertThat(item2.getSourceType()).isEqualTo("com.example.Retry");
+
+		ConfigurationMetadataItem item3 = items.get(2);
+		assertThat(item3.getName()).isEqualTo("enabled");
+		assertThat(item3.getSourceType()).isEqualTo("com.example.Retry");
+	}
+
 	RawConfigurationMetadata readFor(String path) throws IOException {
 		return this.reader.read(getInputStreamFor(path), DEFAULT_CHARSET);
 	}

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/test/resources/metadata/configuration-metadata-multi-groups.json

+{
+  "groups": [
+    {
+      "name": "test.group.one.retry",
+      "type": "com.example.Retry",
+      "sourceType": "org.acme.config.TestApp",
+      "sourceMethod": "one()"
+    },
+    {
+      "name": "test.group.two.retry",
+      "type": "com.example.Retry",
+      "sourceType": "org.acme.config.TestApp",
+      "sourceMethod": "two()"
+    },
+    {
+      "name": "test.group.one.retry.specific",
+      "type": "com.example.Retry",
+      "sourceType": "org.acme.config.TestApp",
+      "sourceMethod": "two()"
+    }
+  ],
+  "properties": [
+    {
+      "name": "test.group.one.retry.enabled",
+      "type": "java.lang.Boolean",
+      "description": "Whether publishing retries are enabled.",
+      "sourceType": "com.example.Retry",
+      "defaultValue": false
+    },
+    {
+      "name": "test.group.two.retry.enabled",
+      "type": "java.lang.Boolean",
+      "description": "Whether publishing retries are enabled.",
+      "sourceType": "com.example.Retry",
+      "defaultValue": false
+    },
+    {
+      "name": "test.group.one.retry.specific.enabled",
+      "type": "java.lang.Boolean",
+      "description": "Whether publishing retries are enabled.",
+      "sourceType": "com.example.Retry",
+      "defaultValue": false
+    }
+  ]
+}
\ No newline at end of file