Polishing.

Add deprecations, refine nullability arrangements.

Original Pull Request: #4635

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/util/json/EvaluationContextExpressionEvaluator.java

@@ -17,13 +17,11 @@ package org.springframework.data.mongodb.util.json;
 
 import java.util.Collections;
 import java.util.Map;
-import java.util.function.Supplier;
 
-import org.springframework.data.mapping.model.SpELExpressionEvaluator;
+import org.springframework.data.mapping.model.ValueExpressionEvaluator;
 import org.springframework.expression.EvaluationContext;
+import org.springframework.expression.Expression;
 import org.springframework.expression.ExpressionParser;
-import org.springframework.expression.spel.standard.SpelExpression;
-import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.expression.spel.support.StandardEvaluationContext;
 import org.springframework.lang.Nullable;
 
@@ -31,18 +29,15 @@ import org.springframework.lang.Nullable;
  * @author Christoph Strobl
  * @since 3.3.5
  */
-class EvaluationContextExpressionEvaluator implements SpELExpressionEvaluator {
+class EvaluationContextExpressionEvaluator implements ValueExpressionEvaluator {
 
-	ValueProvider valueProvider;
-	ExpressionParser expressionParser;
-	Supplier<EvaluationContext> evaluationContext;
+	final ValueProvider valueProvider;
+	final ExpressionParser expressionParser;
 
-	public EvaluationContextExpressionEvaluator(ValueProvider valueProvider, ExpressionParser expressionParser,
-			Supplier<EvaluationContext> evaluationContext) {
+	public EvaluationContextExpressionEvaluator(ValueProvider valueProvider, ExpressionParser expressionParser) {
 
 		this.valueProvider = valueProvider;
 		this.expressionParser = expressionParser;
-		this.evaluationContext = evaluationContext;
 	}
 
 	@Nullable
@@ -52,19 +47,19 @@ class EvaluationContextExpressionEvaluator implements SpELExpressionEvaluator {
 	}
 
 	public EvaluationContext getEvaluationContext(String expressionString) {
-		return evaluationContext != null ? evaluationContext.get() : new StandardEvaluationContext();
+		return new StandardEvaluationContext();
 	}
 
-	public SpelExpression getParsedExpression(String expressionString) {
-		return (SpelExpression) (expressionParser != null ? expressionParser : new SpelExpressionParser())
-				.parseExpression(expressionString);
+	public Expression getParsedExpression(String expressionString) {
+		return expressionParser.parseExpression(expressionString);
 	}
 
+	@SuppressWarnings("unchecked")
 	public <T> T evaluateExpression(String expressionString, Map<String, Object> variables) {
 
-		SpelExpression expression = getParsedExpression(expressionString);
+		Expression expression = getParsedExpression(expressionString);
 		EvaluationContext ctx = getEvaluationContext(expressionString);
-		variables.forEach((key, value) -> ctx.setVariable(key, value));
+		variables.forEach(ctx::setVariable);
 
 		Object result = expression.getValue(ctx, Object.class);
 		return (T) result;

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/util/json/ParameterBindingContext.java

@@ -19,6 +19,7 @@ import java.util.Map;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
+import org.springframework.data.mapping.model.SpELExpressionEvaluator;
 import org.springframework.data.mapping.model.ValueExpressionEvaluator;
 import org.springframework.data.spel.ExpressionDependencies;
 import org.springframework.data.util.Lazy;
@@ -45,7 +46,9 @@ public class ParameterBindingContext {
 	 * @param valueProvider
 	 * @param expressionParser
 	 * @param evaluationContext
+	 * @deprecated since 4.3, use {@link #ParameterBindingContext(ValueProvider, ExpressionParser, Supplier)} instead.
 	 */
+	@Deprecated(since = "4.3")
 	public ParameterBindingContext(ValueProvider valueProvider, SpelExpressionParser expressionParser,
 			EvaluationContext evaluationContext) {
 		this(valueProvider, expressionParser, () -> evaluationContext);
@@ -59,13 +62,29 @@ public class ParameterBindingContext {
 	 */
 	public ParameterBindingContext(ValueProvider valueProvider, ExpressionParser expressionParser,
 			Supplier<EvaluationContext> evaluationContext) {
-		this(valueProvider, new EvaluationContextExpressionEvaluator(valueProvider, expressionParser, evaluationContext));
+		this(valueProvider, new EvaluationContextExpressionEvaluator(valueProvider, expressionParser) {
+			@Override
+			public EvaluationContext getEvaluationContext(String expressionString) {
+				return evaluationContext.get();
+			}
+		});
 	}
 
 	/**
 	 * @param valueProvider
 	 * @param expressionEvaluator
 	 * @since 3.1
+	 * @deprecated since 4.3, use {@link #ParameterBindingContext(ValueProvider, ValueExpressionEvaluator)} instead.
+	 */
+	@Deprecated(since = "4.3")
+	public ParameterBindingContext(ValueProvider valueProvider, SpELExpressionEvaluator expressionEvaluator) {
+		this(valueProvider, (ValueExpressionEvaluator) expressionEvaluator);
+	}
+
+	/**
+	 * @param valueProvider
+	 * @param expressionEvaluator
+	 * @since 4.3
 	 */
 	public ParameterBindingContext(ValueProvider valueProvider, ValueExpressionEvaluator expressionEvaluator) {
 		this.valueProvider = valueProvider;
@@ -86,7 +105,7 @@ public class ParameterBindingContext {
 			Function<ExpressionDependencies, EvaluationContext> contextFunction) {
 
 		return new ParameterBindingContext(valueProvider,
-				new EvaluationContextExpressionEvaluator(valueProvider, expressionParser, null) {
+				new EvaluationContextExpressionEvaluator(valueProvider, expressionParser) {
 
 					@Override
 					public EvaluationContext getEvaluationContext(String expressionString) {