Add support for Charset for property value code generation

Closes gh-29186

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanDefinitionPropertyValueCodeGenerator.java

@@ -16,6 +16,7 @@
 
 package org.springframework.beans.factory.aot;
 
+import java.nio.charset.Charset;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
@@ -63,6 +64,7 @@ class BeanDefinitionPropertyValueCodeGenerator {
 	private final List<Delegate> delegates = List.of(
 			new PrimitiveDelegate(),
 			new StringDelegate(),
+			new CharsetDelegate(),
 			new EnumDelegate(),
 			new ClassDelegate(),
 			new ResolvableTypeDelegate(),
@@ -207,6 +209,23 @@ public CodeBlock generateCode(Object value, ResolvableType type) {
 	}
 
 
+	/**
+	 * {@link Delegate} for {@link Charset} types.
+	 */
+	private static class CharsetDelegate implements Delegate {
+
+		@Override
+		@Nullable
+		public CodeBlock generateCode(Object value, ResolvableType type) {
+			if (value instanceof Charset charset) {
+				return CodeBlock.of("$T.forName($S)", Charset.class, charset.name());
+			}
+			return null;
+		}
+
+	}
+
+
 	/**
 	 * {@link Delegate} for {@link Enum} types.
 	 */

spring-beans/src/test/java/org/springframework/beans/factory/aot/BeanDefinitionPropertyValueCodeGeneratorTests.java

@@ -18,6 +18,8 @@
 
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.time.temporal.ChronoUnit;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
@@ -196,6 +198,19 @@ void generateWhenString() {
 
 	}
 
+	@Nested
+	class CharsetTests {
+
+		@Test
+		void generateWhenCharset() {
+			compile(StandardCharsets.UTF_8, (instance, compiled) -> {
+				assertThat(instance).isEqualTo(Charset.forName("UTF-8"));
+				assertThat(compiled.getSourceFile()).contains("\"UTF-8\"");
+			});
+		}
+
+	}
+
 	@Nested
 	class EnumTests {