graphql.kickstart.autoconfigure.scalars.GraphQLScalarUtils Maven / Gradle / Ivy
The newest version!
package graphql.kickstart.autoconfigure.scalars;
import graphql.schema.GraphQLScalarType;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Stream;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.springframework.util.ReflectionUtils;
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class GraphQLScalarUtils {
/**
* Extract scalar field definitions from helper classes. Public static
* {@link GraphQLScalarType} fields are considered as scalar definitions.
*
* @param classes classes that may contain scalar definitions.
* @return the map of scalar definitions (keys = scalar names, values are scalar type definitions).
* May return an empty map if no definitions found. If multiple source classes define GraphQL
* scalar types with the same definition, then the last one will be included in the map.
*/
public static Map extractScalarDefinitions(final Class... classes) {
final Map scalarTypes = new HashMap<>();
Stream.of(classes).forEach(clazz -> extractScalarField(clazz, scalarTypes));
return scalarTypes;
}
private static void extractScalarField(Class clazz, Map target) {
ReflectionUtils.doWithFields(clazz, scalarField -> extractedIfScalarField(target, scalarField));
}
private static void extractedIfScalarField(Map target, Field field)
throws IllegalAccessException {
if (Modifier.isPublic(field.getModifiers())
&& Modifier.isStatic(field.getModifiers())
&& field.getType().equals(GraphQLScalarType.class)) {
final GraphQLScalarType graphQLScalarType = (GraphQLScalarType) field.get(null);
target.put(graphQLScalarType.getName(), graphQLScalarType);
}
}
}