refactor scala object deserialization

Author: pjfanning

src/main/scala/com/fasterxml/jackson/module/scala/deser/ScalaObjectDeserializerModule.scala

@@ -10,22 +10,15 @@ import com.fasterxml.jackson.module.scala.util.ClassW
 import scala.languageFeature.postfixOps
 import scala.util.control.NonFatal
 
-private class ScalaObjectDeserializer(clazz: Class[_]) extends StdDeserializer[Any](classOf[Any]) {
-  override def deserialize(p: JsonParser, ctxt: DeserializationContext): Any = {
-    try {
-      clazz.getField("MODULE$").get(null)
-    } catch {
-      case NonFatal(_) => null
-    }
-  }
+private class ScalaObjectDeserializer(value: Any) extends StdDeserializer[Any](classOf[Any]) {
+  override def deserialize(p: JsonParser, ctxt: DeserializationContext): Any = value
 }
 
 private object ScalaObjectDeserializerResolver extends Deserializers.Base {
   override def findBeanDeserializer(javaType: JavaType, config: DeserializationConfig, beanDesc: BeanDescription): JsonDeserializer[_] = {
-    val clazz = javaType.getRawClass
-    if (ClassW(clazz).isScalaObject)
-      new ScalaObjectDeserializer(clazz)
-    else null
+    ClassW(javaType.getRawClass).getModuleField.flatMap { field =>
+      Option(field.get(null))
+    }.map(new ScalaObjectDeserializer(_)).orNull
   }
 }
 

src/main/scala/com/fasterxml/jackson/module/scala/util/Classes.scala

@@ -1,5 +1,6 @@
 package com.fasterxml.jackson.module.scala.util
 
+import java.lang.reflect.Field
 import scala.annotation.tailrec
 import scala.language.implicitConversions
 import scala.reflect.{ScalaLongSignature, ScalaSignature}
@@ -28,8 +29,10 @@ trait ClassW extends PimpedType[Class[_]] {
     hasSigHelper(value)
   }
 
-  def isScalaObject: Boolean = {
-    Try(value.getField("MODULE$")).isSuccess
+  def isScalaObject: Boolean = getModuleField.nonEmpty
+
+  def getModuleField: Option[Field] = {
+    Try(value.getField("MODULE$")).toOption
   }
 }