Allow overriding case in SpringPhysicalNamingStrategy

Fixes gh-7410

spring-boot/src/main/java/org/springframework/boot/orm/jpa/hibernate/SpringPhysicalNamingStrategy.java

@@ -27,6 +27,7 @@ import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
  * conventions.
  *
  * @author Phillip Webb
+ * @author Madhura Bhave
  * @since 1.4.0
  */
 public class SpringPhysicalNamingStrategy implements PhysicalNamingStrategy {
@@ -34,45 +35,59 @@ public class SpringPhysicalNamingStrategy implements PhysicalNamingStrategy {
 	@Override
 	public Identifier toPhysicalCatalogName(Identifier name,
 			JdbcEnvironment jdbcEnvironment) {
-		return apply(name);
+		return apply(name, jdbcEnvironment);
 	}
 
 	@Override
 	public Identifier toPhysicalSchemaName(Identifier name,
 			JdbcEnvironment jdbcEnvironment) {
-		return apply(name);
+		return apply(name, jdbcEnvironment);
 	}
 
 	@Override
 	public Identifier toPhysicalTableName(Identifier name,
 			JdbcEnvironment jdbcEnvironment) {
-		return apply(name);
+		return apply(name, jdbcEnvironment);
 	}
 
 	@Override
 	public Identifier toPhysicalSequenceName(Identifier name,
 			JdbcEnvironment jdbcEnvironment) {
-		return apply(name);
+		return apply(name, jdbcEnvironment);
 	}
 
 	@Override
 	public Identifier toPhysicalColumnName(Identifier name,
 			JdbcEnvironment jdbcEnvironment) {
-		return apply(name);
+		return apply(name, jdbcEnvironment);
 	}
 
-	private Identifier apply(Identifier name) {
+	private Identifier apply(Identifier name, JdbcEnvironment jdbcEnvironment) {
 		if (name == null) {
 			return null;
 		}
-		StringBuilder text = new StringBuilder(name.getText().replace('.', '_'));
+		StringBuilder builder = new StringBuilder(name.getText().replace('.', '_'));
-		for (int i = 1; i < text.length() - 1; i++) {
+		for (int i = 1; i < builder.length() - 1; i++) {
-			if (isUnderscoreRequired(text.charAt(i - 1), text.charAt(i),
+			if (isUnderscoreRequired(builder.charAt(i - 1), builder.charAt(i),
-					text.charAt(i + 1))) {
+					builder.charAt(i + 1))) {
-				text.insert(i++, '_');
+				builder.insert(i++, '_');
 			}
 		}
-		return new Identifier(text.toString().toLowerCase(Locale.ROOT), name.isQuoted());
+
+		String text = builder.toString();
+		String finalText = isCaseInsensitive(jdbcEnvironment) ? text.toLowerCase(Locale.ROOT)
+				: text;
+		return new Identifier(finalText, name.isQuoted());
+	}
+
+	/**
+	 * Specify whether the database is case sensitive.
+	 * @param jdbcEnvironment The JDBC environment which can be used to determine case
+	 * @return true if the database is case insensitive
+	 * sensitivity
+	 */
+	protected boolean isCaseInsensitive(JdbcEnvironment jdbcEnvironment) {
+		return true;
 	}
 
 	private boolean isUnderscoreRequired(char before, char current, char after) {

spring-boot/src/test/java/org/springframework/boot/orm/jpa/hibernate/SpringPhysicalNamingStrategyTests.java

@@ -23,6 +23,7 @@ import org.hibernate.boot.registry.StandardServiceRegistry;
 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 import org.hibernate.cfg.AvailableSettings;
 import org.hibernate.dialect.H2Dialect;
+import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
 import org.hibernate.mapping.PersistentClass;
 import org.hibernate.service.ServiceRegistry;
 import org.junit.Before;
@@ -34,17 +35,22 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Tests for {@link SpringPhysicalNamingStrategy}.
  *
  * @author Phillip Webb
+ * @author Madhura Bhave
  */
 public class SpringPhysicalNamingStrategyTests {
 
 	private Metadata metadata;
 
+	private MetadataSources metadataSources;
+
+	private StandardServiceRegistry serviceRegistry;
+
 	@Before
 	public void setup() throws Exception {
-		MetadataSources metadataSources = new MetadataSources();
+		this.metadataSources = new MetadataSources();
-		metadataSources.addAnnotatedClass(TelephoneNumber.class);
+		this.metadataSources.addAnnotatedClass(TelephoneNumber.class);
-		StandardServiceRegistry serviceRegistry = getServiceRegistry(metadataSources);
+		this.serviceRegistry = getServiceRegistry(this.metadataSources);
-		this.metadata = metadataSources.getMetadataBuilder(serviceRegistry)
+		this.metadata = this.metadataSources.getMetadataBuilder(this.serviceRegistry)
 				.applyPhysicalNamingStrategy(new SpringPhysicalNamingStrategy()).build();
 	}
 
@@ -61,4 +67,21 @@ public class SpringPhysicalNamingStrategyTests {
 		assertThat(binding.getTable().getQuotedName()).isEqualTo("telephone_number");
 	}
 
+	@Test
+	public void tableNameShouldNotBeLowerCaseIfCaseSensitive() throws Exception {
+		this.metadata = this.metadataSources.getMetadataBuilder(this.serviceRegistry)
+				.applyPhysicalNamingStrategy(new TestSpringPhysicalNamingStrategy()).build();
+		PersistentClass binding = this.metadata
+				.getEntityBinding(TelephoneNumber.class.getName());
+		assertThat(binding.getTable().getQuotedName()).isEqualTo("Telephone_Number");
+	}
+
+	private class TestSpringPhysicalNamingStrategy extends SpringPhysicalNamingStrategy  {
+
+		@Override
+		protected boolean isCaseInsensitive(JdbcEnvironment jdbcEnvironment) {
+			return false;
+		}
+
+	}
 }