Apply "instanceof pattern matching" to remaining Validation classes

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -169,8 +169,8 @@ public abstract class AbstractBindingResult extends AbstractErrors implements Bi
 	public List<FieldError> getFieldErrors() {
 		List<FieldError> result = new ArrayList<>();
 		for (ObjectError objectError : this.errors) {
-			if (objectError instanceof FieldError) {
-				result.add((FieldError) objectError);
+			if (objectError instanceof FieldError fieldError) {
+				result.add(fieldError);
 			}
 		}
 		return Collections.unmodifiableList(result);
@@ -180,8 +180,8 @@ public abstract class AbstractBindingResult extends AbstractErrors implements Bi
 	@Nullable
 	public FieldError getFieldError() {
 		for (ObjectError objectError : this.errors) {
-			if (objectError instanceof FieldError) {
-				return (FieldError) objectError;
+			if (objectError instanceof FieldError fieldError) {
+				return fieldError;
 			}
 		}
 		return null;
@@ -192,8 +192,8 @@ public abstract class AbstractBindingResult extends AbstractErrors implements Bi
 		List<FieldError> result = new ArrayList<>();
 		String fixedField = fixedField(field);
 		for (ObjectError objectError : this.errors) {
-			if (objectError instanceof FieldError && isMatchingFieldError(fixedField, (FieldError) objectError)) {
-				result.add((FieldError) objectError);
+			if (objectError instanceof FieldError fieldError && isMatchingFieldError(fixedField, fieldError)) {
+				result.add(fieldError);
 			}
 		}
 		return Collections.unmodifiableList(result);
@@ -204,10 +204,8 @@ public abstract class AbstractBindingResult extends AbstractErrors implements Bi
 	public FieldError getFieldError(String field) {
 		String fixedField = fixedField(field);
 		for (ObjectError objectError : this.errors) {
-			if (objectError instanceof FieldError fieldError) {
-				if (isMatchingFieldError(fixedField, fieldError)) {
-					return fieldError;
-				}
+			if (objectError instanceof FieldError fieldError && isMatchingFieldError(fixedField, fieldError)) {
+				return fieldError;
 			}
 		}
 		return null;

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -42,10 +42,15 @@ public abstract class BindingResultUtils {
 		Assert.notNull(model, "Model map must not be null");
 		Assert.notNull(name, "Name must not be null");
 		Object attr = model.get(BindingResult.MODEL_KEY_PREFIX + name);
-		if (attr != null && !(attr instanceof BindingResult)) {
+		if (attr == null) {
+			return null;
+		}
+		if (attr instanceof BindingResult bindingResult) {
+			return bindingResult;
+		}
+		else {
 			throw new IllegalStateException("BindingResult attribute is not of type BindingResult: " + attr);
 		}
-		return (BindingResult) attr;
 	}
 
 	/**

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

@@ -849,8 +849,8 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 				PropertyValue pv = propertyValues.get(field);
 				boolean empty = (pv == null || pv.getValue() == null);
 				if (!empty) {
-					if (pv.getValue() instanceof String) {
-						empty = !StringUtils.hasText((String) pv.getValue());
+					if (pv.getValue() instanceof String text) {
+						empty = !StringUtils.hasText(text);
 					}
 					else if (pv.getValue() instanceof String[] values) {
 						empty = (values.length == 0 || !StringUtils.hasText(values[0]));

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -105,8 +105,8 @@ public class ObjectError extends DefaultMessageSourceResolvable {
 		if (sourceType.isInstance(this.source)) {
 			return sourceType.cast(this.source);
 		}
-		else if (this.source instanceof Throwable) {
-			Throwable cause = ((Throwable) this.source).getCause();
+		else if (this.source instanceof Throwable throwable) {
+			Throwable cause = throwable.getCause();
 			if (sourceType.isInstance(cause)) {
 				return sourceType.cast(cause);
 			}
@@ -126,7 +126,7 @@ public class ObjectError extends DefaultMessageSourceResolvable {
 	 */
 	public boolean contains(Class<?> sourceType) {
 		return (sourceType.isInstance(this.source) ||
-				(this.source instanceof Throwable && sourceType.isInstance(((Throwable) this.source).getCause())));
+				(this.source instanceof Throwable throwable && sourceType.isInstance(throwable.getCause())));
 	}
 
 

spring-context/src/main/java/org/springframework/validation/annotation/ValidationAnnotationUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -64,7 +64,7 @@ public abstract class ValidationAnnotationUtils {
 		if (hints == null) {
 			return EMPTY_OBJECT_ARRAY;
 		}
-		return (hints instanceof Object[] ? (Object[]) hints : new Object[]{hints});
+		return (hints instanceof Object[] objectHints ? objectHints : new Object[] {hints});
 	}
 
 }