DATAJDBC-637 - Polishing.

Make Jsr310TimestampBasedConverters package-private. Introduce convenience constructors to improve external configuration of JdbcCustomConversions.

Original pull request: #254.

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

@@ -19,6 +19,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
+import org.springframework.core.convert.converter.GenericConverter.ConvertiblePair;
 import org.springframework.data.convert.CustomConversions;
 import org.springframework.data.jdbc.core.mapping.JdbcSimpleTypes;
 
@@ -27,6 +28,7 @@ import org.springframework.data.jdbc.core.mapping.JdbcSimpleTypes;
  * {@link org.springframework.data.mapping.model.SimpleTypeHolder}
  *
  * @author Mark Paluch
+ * @author Jens Schauder
  * @see CustomConversions
  * @see org.springframework.data.mapping.model.SimpleTypeHolder
  * @see JdbcSimpleTypes
@@ -54,12 +56,27 @@ public class JdbcCustomConversions extends CustomConversions {
 		super(new ConverterConfiguration(STORE_CONVERSIONS, converters, JdbcCustomConversions::isDateTimeApiConversion));
 	}
 
-	private static boolean isDateTimeApiConversion(
-			org.springframework.core.convert.converter.GenericConverter.ConvertiblePair cp) {
+	/**
+	 * Create a new {@link JdbcCustomConversions} instance given
+	 * {@link org.springframework.data.convert.CustomConversions.ConverterConfiguration}.
+	 *
+	 * @param converterConfiguration must not be {@literal null}.
+	 * @since 2.2
+	 */
+	public JdbcCustomConversions(ConverterConfiguration converterConfiguration) {
+		super(converterConfiguration);
+	}
 
-		return (cp.getSourceType().getTypeName().equals("java.util.Date")
-				&& cp.getTargetType().getTypeName().startsWith("java.time.") //
-		) || (cp.getTargetType().getTypeName().equals("java.util.Date")
-				&& cp.getSourceType().getTypeName().startsWith("java.time."));
+	private static boolean isDateTimeApiConversion(ConvertiblePair cp) {
+
+		if (cp.getSourceType().equals(java.util.Date.class) && cp.getTargetType().getTypeName().startsWith("java.time.")) {
+			return true;
+		}
+
+		if (cp.getTargetType().equals(java.util.Date.class) && cp.getSourceType().getTypeName().startsWith("java.time.")) {
+			return true;
+		}
+
+		return false;
 	}
 }

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/Jsr310TimestampBasedConverters.java

@@ -15,7 +15,6 @@
  */
 package org.springframework.data.jdbc.core.convert;
 
-import static java.time.Instant.*;
 import static java.time.LocalDateTime.*;
 import static java.time.ZoneId.*;
 
@@ -41,12 +40,12 @@ import org.springframework.lang.NonNull;
 /**
  * Helper class to register JSR-310 specific {@link Converter} implementations. These converters are based on
  * {@link java.sql.Timestamp} instead of {@link Date} and therefore preserve nanosecond precision
- * 
+ *
  * @see org.springframework.data.convert.Jsr310Converters
  * @author Jens Schauder
  * @since 2.2
  */
-public abstract class Jsr310TimestampBasedConverters {
+abstract class Jsr310TimestampBasedConverters {
 
 	private static final List<Class<?>> CLASSES = Arrays.asList(LocalDateTime.class, LocalDate.class, LocalTime.class,
 			Instant.class, ZoneId.class, Duration.class, Period.class);
@@ -58,7 +57,8 @@ public abstract class Jsr310TimestampBasedConverters {
 	 */
 	public static Collection<Converter<?, ?>> getConvertersToRegister() {
 
-		List<Converter<?, ?>> converters = new ArrayList<>();
+		List<Converter<?, ?>> converters = new ArrayList<>(8);
+
 		converters.add(TimestampToLocalDateTimeConverter.INSTANCE);
 		converters.add(LocalDateTimeToTimestampConverter.INSTANCE);
 		converters.add(TimestampToLocalDateConverter.INSTANCE);
@@ -71,11 +71,6 @@ public abstract class Jsr310TimestampBasedConverters {
 		return converters;
 	}
 
-	public static boolean supports(Class<?> type) {
-
-		return CLASSES.contains(type);
-	}
-
 	@ReadingConverter
 	public enum TimestampToLocalDateTimeConverter implements Converter<Timestamp, LocalDateTime> {