Apply 'instanceof pattern matching' in spring-expression

spring-expression/src/main/java/org/springframework/expression/spel/ast/FunctionReference.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -70,14 +70,14 @@ public class FunctionReference extends SpelNodeImpl {
 		if (value == TypedValue.NULL) {
 			throw new SpelEvaluationException(getStartPosition(), SpelMessage.FUNCTION_NOT_DEFINED, this.name);
 		}
-		if (!(value.getValue() instanceof Method)) {
+		if (!(value.getValue() instanceof Method function)) {
 			// Possibly a static Java method registered as a function
 			throw new SpelEvaluationException(
 					SpelMessage.FUNCTION_REFERENCE_CANNOT_BE_INVOKED, this.name, value.getClass());
 		}
 
 		try {
-			return executeFunctionJLRMethod(state, (Method) value.getValue());
+			return executeFunctionJLRMethod(state, function);
 		}
 		catch (SpelEvaluationException ex) {
 			ex.setPosition(getStartPosition());

spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -165,11 +165,11 @@ public class Indexer extends SpelNodeImpl {
 				this.indexedType = IndexedType.ARRAY;
 				return new ArrayIndexingValueRef(state.getTypeConverter(), target, idx, targetDescriptor);
 			}
-			else if (target instanceof Collection) {
+			else if (target instanceof Collection<?> collection) {
 				if (target instanceof List) {
 					this.indexedType = IndexedType.LIST;
 				}
-				return new CollectionIndexingValueRef((Collection<?>) target, idx, targetDescriptor,
+				return new CollectionIndexingValueRef(collection, idx, targetDescriptor,
 						state.getTypeConverter(), state.getConfiguration().isAutoGrowCollections(),
 						state.getConfiguration().getMaximumAutoGrowSize());
 			}

spring-expression/src/main/java/org/springframework/expression/spel/ast/MethodReference.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -134,7 +134,7 @@ public class MethodReference extends SpelNodeImpl {
 		// either there was no accessor or it no longer existed
 		executorToUse = findAccessorForMethod(argumentTypes, value, evaluationContext);
 		this.cachedExecutor = new CachedMethodExecutor(
-				executorToUse, (value instanceof Class ? (Class<?>) value : null), targetType, argumentTypes);
+				executorToUse, (value instanceof Class<?> clazz ? clazz : null), targetType, argumentTypes);
 		try {
 			return executorToUse.execute(evaluationContext, value, arguments);
 		}
@@ -216,7 +216,7 @@ public class MethodReference extends SpelNodeImpl {
 
 		String method = FormatHelper.formatMethodForMessage(this.name, argumentTypes);
 		String className = FormatHelper.formatClassNameForMessage(
-				targetObject instanceof Class ? ((Class<?>) targetObject) : targetObject.getClass());
+				targetObject instanceof Class<?> clazz ? clazz : targetObject.getClass());
 		if (accessException != null) {
 			throw new SpelEvaluationException(
 					getStartPosition(), accessException, SpelMessage.PROBLEM_LOCATING_METHOD, method, className);
@@ -233,8 +233,8 @@ public class MethodReference extends SpelNodeImpl {
 	private void throwSimpleExceptionIfPossible(Object value, AccessException ex) {
 		if (ex.getCause() instanceof InvocationTargetException) {
 			Throwable rootCause = ex.getCause().getCause();
-			if (rootCause instanceof RuntimeException) {
-				throw (RuntimeException) rootCause;
+			if (rootCause instanceof RuntimeException runtimeException) {
+				throw runtimeException;
 			}
 			throw new ExpressionInvocationTargetException(getStartPosition(),
 					"A problem occurred when trying to execute method '" + this.name +
@@ -244,8 +244,8 @@ public class MethodReference extends SpelNodeImpl {
 
 	private void updateExitTypeDescriptor() {
 		CachedMethodExecutor executorToCheck = this.cachedExecutor;
-		if (executorToCheck != null && executorToCheck.get() instanceof ReflectiveMethodExecutor) {
-			Method method = ((ReflectiveMethodExecutor) executorToCheck.get()).getMethod();
+		if (executorToCheck != null && executorToCheck.get() instanceof ReflectiveMethodExecutor reflectiveMethodExecutor) {
+			Method method = reflectiveMethodExecutor.getMethod();
 			String descriptor = CodeFlow.toDescriptor(method.getReturnType());
 			if (this.nullSafe && CodeFlow.isPrimitive(descriptor)) {
 				this.originalPrimitiveExitTypeDescriptor = descriptor;

spring-expression/src/main/java/org/springframework/expression/spel/ast/OperatorBetween.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -53,12 +53,11 @@ public class OperatorBetween extends Operator {
 	public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
 		Object left = getLeftOperand().getValueInternal(state).getValue();
 		Object right = getRightOperand().getValueInternal(state).getValue();
-		if (!(right instanceof List) || ((List<?>) right).size() != 2) {
+		if (!(right instanceof List<?> list) || list.size() != 2) {
 			throw new SpelEvaluationException(getRightOperand().getStartPosition(),
 					SpelMessage.BETWEEN_RIGHT_OPERAND_MUST_BE_TWO_ELEMENT_LIST);
 		}
 
-		List<?> list = (List<?>) right;
 		Object low = list.get(0);
 		Object high = list.get(1);
 		TypeComparator comp = state.getTypeComparator();

spring-expression/src/main/java/org/springframework/expression/spel/ast/OperatorInstanceof.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -62,12 +62,11 @@ public class OperatorInstanceof extends Operator {
 		Object leftValue = left.getValue();
 		Object rightValue = right.getValue();
 		BooleanTypedValue result;
-		if (!(rightValue instanceof Class)) {
+		if (!(rightValue instanceof Class<?> rightClass)) {
 			throw new SpelEvaluationException(getRightOperand().getStartPosition(),
 					SpelMessage.INSTANCEOF_OPERATOR_NEEDS_CLASS_OPERAND,
 					(rightValue == null ? "null" : rightValue.getClass().getName()));
 		}
-		Class<?> rightClass = (Class<?>) rightValue;
 		if (leftValue == null) {
 			result = BooleanTypedValue.FALSE;  // null is not an instanceof anything
 		}

spring-expression/src/main/java/org/springframework/expression/spel/ast/Projection.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -70,8 +70,7 @@ public class Projection extends SpelNodeImpl {
 		// has two fields 'key' and 'value' that refer to the map entries key
 		// and value, and they can be referenced in the operation
 		// eg. {'a':'y','b':'n'}.![value=='y'?key:null]" == ['a', null]
-		if (operand instanceof Map) {
-			Map<?, ?> mapData = (Map<?, ?>) operand;
+		if (operand instanceof Map<?, ?> mapData) {
 			List<Object> result = new ArrayList<>();
 			for (Map.Entry<?, ?> entry : mapData.entrySet()) {
 				try {
@@ -88,8 +87,8 @@ public class Projection extends SpelNodeImpl {
 		}
 
 		if (operand instanceof Iterable || operandIsArray) {
-			Iterable<?> data = (operand instanceof Iterable ?
-					(Iterable<?>) operand : Arrays.asList(ObjectUtils.toObjectArray(operand)));
+			Iterable<?> data = (operand instanceof Iterable<?> iterable ?
+					iterable : Arrays.asList(ObjectUtils.toObjectArray(operand)));
 
 			List<Object> result = new ArrayList<>();
 			Class<?> arrayElementType = null;

spring-expression/src/main/java/org/springframework/expression/spel/ast/Selection.java

@@ -87,8 +87,7 @@ public class Selection extends SpelNodeImpl {
 		Object operand = op.getValue();
 		SpelNodeImpl selectionCriteria = this.children[0];
 
-		if (operand instanceof Map) {
-			Map<?, ?> mapdata = (Map<?, ?>) operand;
+		if (operand instanceof Map<?, ?> mapdata) {
 			// TODO don't lose generic info for the new map
 			Map<Object, Object> result = new HashMap<>();
 			Object lastKey = null;
@@ -99,8 +98,8 @@ public class Selection extends SpelNodeImpl {
 					state.pushActiveContextObject(kvPair);
 					state.enterScope();
 					Object val = selectionCriteria.getValueInternal(state).getValue();
-					if (val instanceof Boolean) {
-						if ((Boolean) val) {
+					if (val instanceof Boolean b) {
+						if (b) {
 							if (this.variant == FIRST) {
 								result.put(entry.getKey(), entry.getValue());
 								return new ValueRef.TypedValueHolderValueRef(new TypedValue(result), this);
@@ -135,8 +134,8 @@ public class Selection extends SpelNodeImpl {
 		}
 
 		if (operand instanceof Iterable || ObjectUtils.isArray(operand)) {
-			Iterable<?> data = (operand instanceof Iterable ?
-					(Iterable<?>) operand : Arrays.asList(ObjectUtils.toObjectArray(operand)));
+			Iterable<?> data = (operand instanceof Iterable<?> iterable ?
+					iterable : Arrays.asList(ObjectUtils.toObjectArray(operand)));
 
 			List<Object> result = new ArrayList<>();
 			int index = 0;
@@ -145,8 +144,8 @@ public class Selection extends SpelNodeImpl {
 					state.pushActiveContextObject(new TypedValue(element));
 					state.enterScope("index", index);
 					Object val = selectionCriteria.getValueInternal(state).getValue();
-					if (val instanceof Boolean) {
-						if ((Boolean) val) {
+					if (val instanceof Boolean b) {
+						if (b) {
 							if (this.variant == FIRST) {
 								return new ValueRef.TypedValueHolderValueRef(new TypedValue(element), this);
 							}

spring-expression/src/main/java/org/springframework/expression/spel/ast/SpelNodeImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -144,7 +144,7 @@ public abstract class SpelNodeImpl implements SpelNode, Opcodes {
 		if (obj == null) {
 			return null;
 		}
-		return (obj instanceof Class ? ((Class<?>) obj) : obj.getClass());
+		return (obj instanceof Class<?> clazz ? clazz : obj.getClass());
 	}
 
 	@Override
@@ -207,8 +207,7 @@ public abstract class SpelNodeImpl implements SpelNode, Opcodes {
 	protected static void generateCodeForArguments(MethodVisitor mv, CodeFlow cf, Member member, SpelNodeImpl[] arguments) {
 		String[] paramDescriptors = null;
 		boolean isVarargs = false;
-		if (member instanceof Constructor) {
-			Constructor<?> ctor = (Constructor<?>) member;
+		if (member instanceof Constructor<?> ctor) {
 			paramDescriptors = CodeFlow.toDescriptors(ctor.getParameterTypes());
 			isVarargs = ctor.isVarArgs();
 		}

spring-expression/src/main/java/org/springframework/expression/spel/standard/SpelCompiler.java

@@ -252,7 +252,7 @@ public final class SpelCompiler implements Opcodes {
 	 * {@code false} otherwise
 	 */
 	public static boolean compile(Expression expression) {
-		return (expression instanceof SpelExpression && ((SpelExpression) expression).compileExpression());
+		return (expression instanceof SpelExpression spelExpression && spelExpression.compileExpression());
 	}
 
 	/**
@@ -261,8 +261,8 @@ public final class SpelCompiler implements Opcodes {
 	 * @param expression the expression
 	 */
 	public static void revertToInterpreted(Expression expression) {
-		if (expression instanceof SpelExpression) {
-			((SpelExpression) expression).revertToInterpreted();
+		if (expression instanceof SpelExpression spelExpression) {
+			spelExpression.revertToInterpreted();
 		}
 	}
 

spring-expression/src/main/java/org/springframework/expression/spel/support/ReflectiveMethodResolver.java

@@ -114,7 +114,7 @@ public class ReflectiveMethodResolver implements MethodResolver {
 
 		try {
 			TypeConverter typeConverter = context.getTypeConverter();
-			Class<?> type = (targetObject instanceof Class ? (Class<?>) targetObject : targetObject.getClass());
+			Class<?> type = (targetObject instanceof Class<?> clazz ? clazz : targetObject.getClass());
 			ArrayList<Method> methods = new ArrayList<>(getMethods(type, targetObject));
 
 			// If a filter is registered for this type, call it