Make ParameterTypeConverter compatible with Spring

Author: jeffgbutler

src/main/java/org/mybatis/dynamic/sql/BindableColumn.java

@@ -36,7 +36,7 @@ public interface BindableColumn<T> extends BasicColumn {
     @Override
     BindableColumn<T> as(String alias);
 
-    default @Nullable Object convertParameterType(@Nullable T value) {
+    default @Nullable Object convertParameterType(T value) {
         return value;
     }
 

src/main/java/org/mybatis/dynamic/sql/ParameterTypeConverter.java

@@ -52,5 +52,5 @@
  */
 @FunctionalInterface
 public interface ParameterTypeConverter<S, T> {
-    @Nullable T convert(@Nullable S source);
+    @Nullable T convert(S source);
 }

src/main/java/org/mybatis/dynamic/sql/SqlColumn.java

@@ -81,7 +81,7 @@ public Optional<Class<T>> javaType() {
 
     @Override
     public @Nullable Object convertParameterType(@Nullable T value) {
-        return parameterTypeConverter.convert(value);
+        return value == null ? null : parameterTypeConverter.convert(value);
     }
 
     @Override

src/main/java/org/mybatis/dynamic/sql/util/ValueWhenPresentMapping.java

@@ -38,7 +38,7 @@ public Optional<Object> value() {
         return Optional.ofNullable(valueSupplier.get()).map(this::convert);
     }
 
-    private @Nullable Object convert(T value) {
+    private @Nullable Object convert(@Nullable T value) {
         return localColumn.convertParameterType(value);
     }
 

src/test/java/examples/spring/LastNameParameterConverter.java

@@ -22,7 +22,7 @@
 public class LastNameParameterConverter implements ParameterTypeConverter<LastName, String>,
         Converter<LastName, String> {
     @Override
-    public @Nullable String convert(@Nullable LastName source) {
-        return source == null ? null : source.getName();
+    public @Nullable String convert(LastName source) {
+        return source.getName();
     }
 }

src/test/java/examples/spring/YesNoParameterConverter.java

@@ -15,13 +15,14 @@
  */
 package examples.spring;
 
+import org.jspecify.annotations.NonNull;
 import org.jspecify.annotations.Nullable;
 import org.mybatis.dynamic.sql.ParameterTypeConverter;
 
 public class YesNoParameterConverter implements ParameterTypeConverter<Boolean, String> {
 
     @Override
-    public @Nullable String convert(@Nullable Boolean source) {
-        return source == null ? null : source ? "Yes" : "No";
+    public @Nullable String convert(@NonNull Boolean source) {
+        return source ? "Yes" : "No";
     }
 }