Stop using Constants utility in XmlBeanDefinitionReader

See gh-30851

spring-beans/src/main/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReader.java

@@ -19,6 +19,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 
 import javax.xml.parsers.ParserConfigurationException;
@@ -40,7 +41,6 @@
 import org.springframework.beans.factory.parsing.SourceExtractor;
 import org.springframework.beans.factory.support.AbstractBeanDefinitionReader;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
-import org.springframework.core.Constants;
 import org.springframework.core.NamedThreadLocal;
 import org.springframework.core.io.DescriptiveResource;
 import org.springframework.core.io.Resource;
@@ -68,6 +68,7 @@
  * @author Juergen Hoeller
  * @author Rob Harrop
  * @author Chris Beams
+ * @author Sam Brannen
  * @since 26.11.2003
  * @see #setDocumentReaderClass
  * @see BeanDefinitionDocumentReader
@@ -99,8 +100,16 @@ public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {
 	public static final int VALIDATION_XSD = XmlValidationModeDetector.VALIDATION_XSD;
 
 
-	/** Constants instance for this class. */
-	private static final Constants constants = new Constants(XmlBeanDefinitionReader.class);
+	/**
+	 * Map of constant names to constant values for the validation constants defined
+	 * in this class.
+	 */
+	private static final Map<String, Integer> constants = Map.of(
+			"VALIDATION_NONE", VALIDATION_NONE,
+			"VALIDATION_AUTO", VALIDATION_AUTO,
+			"VALIDATION_DTD", VALIDATION_DTD,
+			"VALIDATION_XSD", VALIDATION_XSD
+		);
 
 	private int validationMode = VALIDATION_AUTO;
 
@@ -163,7 +172,10 @@ public void setValidating(boolean validating) {
 	 * @see #setValidationMode
 	 */
 	public void setValidationModeName(String validationModeName) {
-		setValidationMode(constants.asNumber(validationModeName).intValue());
+		Assert.hasText(validationModeName, "'validationModeName' must not be null or blank");
+		Integer mode = constants.get(validationModeName);
+		Assert.notNull(mode, "Only validation mode constants allowed");
+		setValidationMode(mode);
 	}
 
 	/**

spring-beans/src/test/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReaderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.
@@ -16,6 +16,10 @@
 
 package org.springframework.beans.factory.xml;
 
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.stream.Stream;
+
 import org.junit.jupiter.api.Test;
 import org.xml.sax.InputSource;
 
@@ -27,12 +31,16 @@
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.InputStreamResource;
 import org.springframework.core.io.Resource;
+import org.springframework.util.ReflectionUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 import static org.assertj.core.api.Assertions.assertThatNoException;
 
 /**
+ * Tests for {@link XmlBeanDefinitionReader}.
+ *
  * @author Rick Evans
  * @author Juergen Hoeller
  * @author Sam Brannen
@@ -129,4 +137,28 @@ private void doTestValidation(String resourceName) {
 		assertThat((TestBean) factory.getBean("testBean")).isNotNull();
 	}
 
+	@Test
+	void setValidationModeNameToUnsupportedValues() {
+		assertThatIllegalArgumentException().isThrownBy(() -> reader.setValidationModeName(null));
+		assertThatIllegalArgumentException().isThrownBy(() -> reader.setValidationModeName("   "));
+		assertThatIllegalArgumentException().isThrownBy(() -> reader.setValidationModeName("bogus"));
+	}
+
+	/**
+	 * This test effectively verifies that the internal 'constants' map is properly
+	 * configured for all VALIDATION_ constants defined in {@link XmlBeanDefinitionReader}.
+	 */
+	@Test
+	void setValidationModeNameToAllSupportedValues() {
+		streamValidationModeConstants()
+				.map(Field::getName)
+				.forEach(name -> assertThatNoException().as(name).isThrownBy(() -> reader.setValidationModeName(name)));
+	}
+
+	private static Stream<Field> streamValidationModeConstants() {
+		return Arrays.stream(XmlBeanDefinitionReader.class.getFields())
+				.filter(ReflectionUtils::isPublicStaticFinal)
+				.filter(field -> field.getName().startsWith("VALIDATION_"));
+	}
+
 }