Polishing.

Simplify sanitizer. Add unit test.

See #1405
See #1406
Original pull request #1415

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/BindParameterNameSanitizer.java

@@ -22,16 +22,13 @@ import java.util.regex.Pattern;
  * Sanitizes the name of bind parameters, so they don't contain any illegal characters.
  *
  * @author Jens Schauder
- *
- * @since 3.0
+ * @since 3.0.2
  */
-enum BindParameterNameSanitizer {
-	INSTANCE;
+abstract class BindParameterNameSanitizer {
 
 	private static final Pattern parameterPattern = Pattern.compile("\\W");
 
-	String sanitize(String rawName) {
-
+	static String sanitize(String rawName) {
 		return parameterPattern.matcher(rawName).replaceAll("");
 	}
 }

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/SqlGenerator.java

@@ -17,7 +17,6 @@ package org.springframework.data.jdbc.core.convert;
 
 import java.util.*;
 import java.util.function.Function;
-import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 import org.springframework.data.domain.Pageable;
@@ -157,7 +156,7 @@ class SqlGenerator {
 	}
 
 	private BindMarker getBindMarker(SqlIdentifier columnName) {
-		return SQL.bindMarker(":" + BindParameterNameSanitizer.INSTANCE.sanitize(renderReference(columnName)));
+		return SQL.bindMarker(":" + BindParameterNameSanitizer.sanitize(renderReference(columnName)));
 	}
 
 	/**
@@ -651,7 +650,7 @@ class SqlGenerator {
 	private String createUpdateWithVersionSql() {
 
 		Update update = createBaseUpdate() //
-				.and(getVersionColumn().isEqualTo(SQL.bindMarker(":" + renderReference(VERSION_SQL_PARAMETER)))) //
+				.and(getVersionColumn().isEqualTo(getBindMarker(VERSION_SQL_PARAMETER))) //
 				.build();
 
 		return render(update);
@@ -685,7 +684,7 @@ class SqlGenerator {
 	private String createDeleteByIdAndVersionSql() {
 
 		Delete delete = createBaseDeleteById(getTable()) //
-				.and(getVersionColumn().isEqualTo(SQL.bindMarker(":" + renderReference(VERSION_SQL_PARAMETER)))) //
+				.and(getVersionColumn().isEqualTo(getBindMarker(VERSION_SQL_PARAMETER))) //
 				.build();
 
 		return render(delete);
@@ -694,13 +693,13 @@ class SqlGenerator {
 	private DeleteBuilder.DeleteWhereAndOr createBaseDeleteById(Table table) {
 
 		return Delete.builder().from(table)
-				.where(getIdColumn().isEqualTo(SQL.bindMarker(":" + renderReference(ID_SQL_PARAMETER))));
+				.where(getIdColumn().isEqualTo(getBindMarker(ID_SQL_PARAMETER)));
 	}
 
 	private DeleteBuilder.DeleteWhereAndOr createBaseDeleteByIdIn(Table table) {
 
 		return Delete.builder().from(table)
-				.where(getIdColumn().in(SQL.bindMarker(":" + renderReference(IDS_SQL_PARAMETER))));
+				.where(getIdColumn().in(getBindMarker(IDS_SQL_PARAMETER)));
 	}
 
 	private String createDeleteByPathAndCriteria(PersistentPropertyPathExtension path,

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/SqlIdentifierParameterSource.java

@@ -68,7 +68,7 @@ class SqlIdentifierParameterSource extends AbstractSqlParameterSource {
 	void addValue(SqlIdentifier identifier, Object value, int sqlType) {
 
 		identifiers.add(identifier);
-		String name = BindParameterNameSanitizer.INSTANCE.sanitize(identifier.getReference(identifierProcessing));
+		String name = BindParameterNameSanitizer.sanitize(identifier.getReference(identifierProcessing));
 		namesToValues.put(name, value);
 		registerSqlType(name, sqlType);
 	}

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/convert/BindParameterNameSanitizerUnitTests.java

@@ -0,0 +1,37 @@
+/*
+ * 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.jdbc.core.convert;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit tests for {@link BindParameterNameSanitizer}.
+ *
+ * @author Mark Paluch
+ */
+class BindParameterNameSanitizerUnitTests {
+
+	@Test
+	void shouldSanitizeNames() {
+
+		assertThat(BindParameterNameSanitizer.sanitize("___oldOptimisticLockingVersion"))
+				.isEqualTo("___oldOptimisticLockingVersion");
+		assertThat(BindParameterNameSanitizer.sanitize("fooBar")).isEqualTo("fooBar");
+		assertThat(BindParameterNameSanitizer.sanitize("one.two.three")).isEqualTo("onetwothree");
+	}
+}