Apply "instance of patten matching" in context and messaging modules

Closes gh-29994

spring-context/src/main/java/org/springframework/validation/DataBinder.java

@@ -760,8 +760,8 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 	 * @see #doBind(org.springframework.beans.MutablePropertyValues)
 	 */
 	public void bind(PropertyValues pvs) {
-		MutablePropertyValues mpvs = (pvs instanceof MutablePropertyValues ?
-				(MutablePropertyValues) pvs : new MutablePropertyValues(pvs));
+		MutablePropertyValues mpvs = (pvs instanceof MutablePropertyValues mutablePropertyValues ?
+				mutablePropertyValues : new MutablePropertyValues(pvs));
 		doBind(mpvs);
 	}
 
@@ -925,8 +925,8 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 		BindingResult bindingResult = getBindingResult();
 		// Call each validator with the same binding result
 		for (Validator validator : getValidators()) {
-			if (!ObjectUtils.isEmpty(validationHints) && validator instanceof SmartValidator) {
-				((SmartValidator) validator).validate(target, bindingResult, validationHints);
+			if (!ObjectUtils.isEmpty(validationHints) && validator instanceof SmartValidator smartValidator) {
+				smartValidator.validate(target, bindingResult, validationHints);
 			}
 			else if (validator != null) {
 				validator.validate(target, bindingResult);

spring-context/src/main/java/org/springframework/validation/ValidationUtils.java

@@ -82,8 +82,8 @@ public abstract class ValidationUtils {
 					"Validator [" + validator.getClass() + "] does not support [" + target.getClass() + "]");
 		}
 
-		if (!ObjectUtils.isEmpty(validationHints) && validator instanceof SmartValidator) {
-			((SmartValidator) validator).validate(target, errors, validationHints);
+		if (!ObjectUtils.isEmpty(validationHints) && validator instanceof SmartValidator smartValidator) {
+			smartValidator.validate(target, errors, validationHints);
 		}
 		else {
 			validator.validate(target, errors);

spring-messaging/src/main/java/org/springframework/messaging/handler/annotation/reactive/PayloadMethodArgumentResolver.java

@@ -170,13 +170,13 @@ public class PayloadMethodArgumentResolver implements HandlerMethodArgumentResol
 	@SuppressWarnings("unchecked")
 	private Flux<DataBuffer> extractContent(MethodParameter parameter, Message<?> message) {
 		Object payload = message.getPayload();
-		if (payload instanceof DataBuffer) {
-			return Flux.just((DataBuffer) payload);
+		if (payload instanceof DataBuffer dataBuffer) {
+			return Flux.just(dataBuffer);
 		}
-		if (payload instanceof Publisher) {
-			return Flux.from((Publisher<?>) payload).map(value -> {
-				if (value instanceof DataBuffer) {
-					return (DataBuffer) value;
+		if (payload instanceof Publisher<?> publisher) {
+			return Flux.from(publisher).map(value -> {
+				if (value instanceof DataBuffer dataBuffer) {
+					return dataBuffer;
 				}
 				String className = value.getClass().getName();
 				throw getUnexpectedPayloadError(message, parameter, "Publisher<" + className + ">");
@@ -204,11 +204,11 @@ public class PayloadMethodArgumentResolver implements HandlerMethodArgumentResol
 		if (headerValue == null) {
 			return null;
 		}
-		else if (headerValue instanceof String) {
-			return MimeTypeUtils.parseMimeType((String) headerValue);
+		else if (headerValue instanceof String stringHeader) {
+			return MimeTypeUtils.parseMimeType(stringHeader);
 		}
-		else if (headerValue instanceof MimeType) {
-			return (MimeType) headerValue;
+		else if (headerValue instanceof MimeType mimeTypeHeader) {
+			return mimeTypeHeader;
 		}
 		else {
 			throw new IllegalArgumentException("Unexpected MimeType value: " + headerValue);
@@ -290,12 +290,12 @@ public class PayloadMethodArgumentResolver implements HandlerMethodArgumentResol
 			Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
 			if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
 				Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
-				Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
+				Object[] validationHints = (hints instanceof Object[] objectHint ? objectHint : new Object[] {hints});
 				String name = Conventions.getVariableNameForParameter(parameter);
 				return target -> {
 					BeanPropertyBindingResult bindingResult = new BeanPropertyBindingResult(target, name);
-					if (!ObjectUtils.isEmpty(validationHints) && this.validator instanceof SmartValidator) {
-						((SmartValidator) this.validator).validate(target, bindingResult, validationHints);
+					if (!ObjectUtils.isEmpty(validationHints) && this.validator instanceof SmartValidator sv) {
+						sv.validate(target, bindingResult, validationHints);
 					}
 					else {
 						this.validator.validate(target, bindingResult);

spring-messaging/src/main/java/org/springframework/messaging/handler/annotation/support/PayloadMethodArgumentResolver.java

@@ -216,11 +216,11 @@ public class PayloadMethodArgumentResolver implements HandlerMethodArgumentResol
 			Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
 			if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
 				Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
-				Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
+				Object[] validationHints = (hints instanceof Object[] objectHint ? objectHint : new Object[] {hints});
 				BeanPropertyBindingResult bindingResult =
 						new BeanPropertyBindingResult(target, getParameterName(parameter));
-				if (!ObjectUtils.isEmpty(validationHints) && this.validator instanceof SmartValidator) {
-					((SmartValidator) this.validator).validate(target, bindingResult, validationHints);
+				if (!ObjectUtils.isEmpty(validationHints) && this.validator instanceof SmartValidator sv) {
+					sv.validate(target, bindingResult, validationHints);
 				}
 				else {
 					this.validator.validate(target, bindingResult);