introduced proper implementation of ValueFunction

Author: schauder

spring-data-relational/src/main/java/org/springframework/data/relational/repository/query/ParameterMetadataProvider.java

@@ -20,7 +20,6 @@
 import java.util.List;
 
 import org.springframework.data.relational.core.dialect.Escaper;
-import org.springframework.data.relational.core.query.ValueFunction;
 import org.springframework.data.repository.query.Parameter;
 import org.springframework.data.repository.query.Parameters;
 import org.springframework.data.repository.query.parser.Part;
@@ -139,12 +138,12 @@ protected Object prepareParameterValue(@Nullable Object value, Class<?> valueTyp
 
 		switch (partType) {
 			case STARTING_WITH:
-				return (ValueFunction<String>) escaper -> escaper.escape(value.toString()) + "%";
+				return SimpleValueFunction.of(value, s -> s + "%");
 			case ENDING_WITH:
-				return (ValueFunction<String>) escaper -> "%" + escaper.escape(value.toString());
+				return SimpleValueFunction.of(value, s -> "%" + s);
 			case CONTAINING:
 			case NOT_CONTAINING:
-				return (ValueFunction<String>) escaper -> "%" + escaper.escape(value.toString()) + "%";
+				return SimpleValueFunction.of(value, s -> "%" + s + "%");
 			default:
 				return value;
 		}

spring-data-relational/src/main/java/org/springframework/data/relational/repository/query/SimpleValueFunction.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.relational.repository.query;
+
+import org.springframework.data.relational.core.dialect.Escaper;
+import org.springframework.data.relational.core.query.ValueFunction;
+
+import java.util.function.Function;
+
+record SimpleValueFunction(Object value, Function<String, String> modifier) implements ValueFunction<String> {
+
+	static SimpleValueFunction of(Object value, Function<String, String> modifier) {
+		return new SimpleValueFunction(value, modifier);
+	}
+
+	@Override
+	public String apply(Escaper escaper) {
+		return modifier.apply(escaper.escape(value.toString()));
+	}
+}