Refactor CacheConfigurations to avoid storing configuration classes

This commit refactors CacheConfigurations implementation to make
it more native friendly by storing strings instead of classes in
order to avoid loading the configuration classes
when CacheConfigurations is initialized at build time.

See gh-25321

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/CacheConfigurations.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -27,24 +27,25 @@ import org.springframework.util.Assert;
  *
  * @author Phillip Webb
  * @author Eddú Meléndez
+ * @author Sebastien Deleuze
  */
 @SuppressWarnings("deprecation")
 final class CacheConfigurations {
 
-	private static final Map<CacheType, Class<?>> MAPPINGS;
+	private static final Map<CacheType, String> MAPPINGS;
 
 	static {
-		Map<CacheType, Class<?>> mappings = new EnumMap<>(CacheType.class);
-		mappings.put(CacheType.GENERIC, GenericCacheConfiguration.class);
-		mappings.put(CacheType.EHCACHE, EhCacheCacheConfiguration.class);
-		mappings.put(CacheType.HAZELCAST, HazelcastCacheConfiguration.class);
-		mappings.put(CacheType.INFINISPAN, InfinispanCacheConfiguration.class);
-		mappings.put(CacheType.JCACHE, JCacheCacheConfiguration.class);
-		mappings.put(CacheType.COUCHBASE, CouchbaseCacheConfiguration.class);
-		mappings.put(CacheType.REDIS, RedisCacheConfiguration.class);
-		mappings.put(CacheType.CAFFEINE, CaffeineCacheConfiguration.class);
-		mappings.put(CacheType.SIMPLE, SimpleCacheConfiguration.class);
-		mappings.put(CacheType.NONE, NoOpCacheConfiguration.class);
+		Map<CacheType, String> mappings = new EnumMap<>(CacheType.class);
+		mappings.put(CacheType.GENERIC, GenericCacheConfiguration.class.getName());
+		mappings.put(CacheType.EHCACHE, EhCacheCacheConfiguration.class.getName());
+		mappings.put(CacheType.HAZELCAST, HazelcastCacheConfiguration.class.getName());
+		mappings.put(CacheType.INFINISPAN, InfinispanCacheConfiguration.class.getName());
+		mappings.put(CacheType.JCACHE, JCacheCacheConfiguration.class.getName());
+		mappings.put(CacheType.COUCHBASE, CouchbaseCacheConfiguration.class.getName());
+		mappings.put(CacheType.REDIS, RedisCacheConfiguration.class.getName());
+		mappings.put(CacheType.CAFFEINE, CaffeineCacheConfiguration.class.getName());
+		mappings.put(CacheType.SIMPLE, SimpleCacheConfiguration.class.getName());
+		mappings.put(CacheType.NONE, NoOpCacheConfiguration.class.getName());
 		MAPPINGS = Collections.unmodifiableMap(mappings);
 	}
 
@@ -52,14 +53,14 @@ final class CacheConfigurations {
 	}
 
 	static String getConfigurationClass(CacheType cacheType) {
-		Class<?> configurationClass = MAPPINGS.get(cacheType);
-		Assert.state(configurationClass != null, () -> "Unknown cache type " + cacheType);
-		return configurationClass.getName();
+		String configurationClassName = MAPPINGS.get(cacheType);
+		Assert.state(configurationClassName != null, () -> "Unknown cache type " + cacheType);
+		return configurationClassName;
 	}
 
 	static CacheType getType(String configurationClassName) {
-		for (Map.Entry<CacheType, Class<?>> entry : MAPPINGS.entrySet()) {
-			if (entry.getValue().getName().equals(configurationClassName)) {
+		for (Map.Entry<CacheType, String> entry : MAPPINGS.entrySet()) {
+			if (entry.getValue().equals(configurationClassName)) {
 				return entry.getKey();
 			}
 		}