Replace contains/put/get pattern with computeIfAbsent

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/jdbc/DataSourcePoolMetrics.java

@@ -110,12 +110,8 @@ public class DataSourcePoolMetrics implements MeterBinder {
 
 		@Override
 		public DataSourcePoolMetadata getDataSourcePoolMetadata(DataSource dataSource) {
-			DataSourcePoolMetadata metadata = cache.get(dataSource);
-			if (metadata == null) {
-				metadata = this.metadataProvider.getDataSourcePoolMetadata(dataSource);
-				cache.put(dataSource, metadata);
-			}
-			return metadata;
+			return cache.computeIfAbsent(dataSource,
+					(key) -> this.metadataProvider.getDataSourcePoolMetadata(dataSource));
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionEvaluationReport.java

@@ -80,10 +80,7 @@ public final class ConditionEvaluationReport {
 		Assert.notNull(condition, "Condition must not be null");
 		Assert.notNull(outcome, "Outcome must not be null");
 		this.unconditionalClasses.remove(source);
-		if (!this.outcomes.containsKey(source)) {
-			this.outcomes.put(source, new ConditionAndOutcomes());
-		}
-		this.outcomes.get(source).add(condition, outcome);
+		this.outcomes.computeIfAbsent(source, (key) -> new ConditionAndOutcomes()).add(condition, outcome);
 		this.addedAncestorOutcomes = false;
 	}
 

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/classloader/ClassLoaderFiles.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -108,12 +108,7 @@ public class ClassLoaderFiles implements ClassLoaderFileRepository, Serializable
 	 * @return an existing or newly added {@link SourceDirectory}
 	 */
 	protected final SourceDirectory getOrCreateSourceDirectory(String name) {
-		SourceDirectory sourceDirectory = this.sourceDirectories.get(name);
-		if (sourceDirectory == null) {
-			sourceDirectory = new SourceDirectory(name);
-			this.sourceDirectories.put(name, sourceDirectory);
-		}
-		return sourceDirectory;
+		return this.sourceDirectories.computeIfAbsent(name, (key) -> new SourceDirectory(name));
 	}
 
 	/**

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

@@ -54,11 +54,8 @@ public class SimpleConfigurationMetadataRepository implements ConfigurationMetad
 	public void add(Collection<ConfigurationMetadataSource> sources) {
 		for (ConfigurationMetadataSource source : sources) {
 			String groupId = source.getGroupId();
-			ConfigurationMetadataGroup group = this.allGroups.get(groupId);
-			if (group == null) {
-				group = new ConfigurationMetadataGroup(groupId);
-				this.allGroups.put(groupId, group);
-			}
+			ConfigurationMetadataGroup group = this.allGroups.computeIfAbsent(groupId,
+					(key) -> new ConfigurationMetadataGroup(groupId));
 			String sourceType = source.getType();
 			if (sourceType != null) {
 				addOrMergeSource(group.getSources(), sourceType, source);
@@ -74,9 +71,9 @@ public class SimpleConfigurationMetadataRepository implements ConfigurationMetad
 	 */
 	public void add(ConfigurationMetadataProperty property, ConfigurationMetadataSource source) {
 		if (source != null) {
-			putIfAbsent(source.getProperties(), property.getId(), property);
+			source.getProperties().putIfAbsent(property.getId(), property);
 		}
-		putIfAbsent(getGroup(source).getProperties(), property.getId(), property);
+		getGroup(source).getProperties().putIfAbsent(property.getId(), property);
 	}
 
 	/**
@@ -91,7 +88,7 @@ public class SimpleConfigurationMetadataRepository implements ConfigurationMetad
 			}
 			else {
 				// Merge properties
-				group.getProperties().forEach((name, value) -> putIfAbsent(existingGroup.getProperties(), name, value));
+				group.getProperties().forEach((name, value) -> existingGroup.getProperties().putIfAbsent(name, value));
 				// Merge sources
 				group.getSources().forEach((name, value) -> addOrMergeSource(existingGroup.getSources(), name, value));
 			}
@@ -101,12 +98,7 @@ public class SimpleConfigurationMetadataRepository implements ConfigurationMetad
 
 	private ConfigurationMetadataGroup getGroup(ConfigurationMetadataSource source) {
 		if (source == null) {
-			ConfigurationMetadataGroup rootGroup = this.allGroups.get(ROOT_GROUP);
-			if (rootGroup == null) {
-				rootGroup = new ConfigurationMetadataGroup(ROOT_GROUP);
-				this.allGroups.put(ROOT_GROUP, rootGroup);
-			}
-			return rootGroup;
+			return this.allGroups.computeIfAbsent(ROOT_GROUP, (key) -> new ConfigurationMetadataGroup(ROOT_GROUP));
 		}
 		return this.allGroups.get(source.getGroupId());
 	}
@@ -118,13 +110,7 @@ public class SimpleConfigurationMetadataRepository implements ConfigurationMetad
 			sources.put(name, source);
 		}
 		else {
-			source.getProperties().forEach((k, v) -> putIfAbsent(existingSource.getProperties(), k, v));
-		}
-	}
-
-	private <V> void putIfAbsent(Map<String, V> map, String key, V value) {
-		if (!map.containsKey(key)) {
-			map.put(key, value);
+			source.getProperties().forEach((k, v) -> existingSource.getProperties().putIfAbsent(k, v));
 		}
 	}