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refactor scala number deserialization to reuse java equivalents #574

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Mar 31, 2022
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7 changes: 6 additions & 1 deletion build.sbt
Original file line number Diff line number Diff line change
Expand Up @@ -153,5 +153,10 @@ mimaBinaryIssueFilters ++= Seq(
ProblemFilters.exclude[ReversedMissingMethodProblem]("com.fasterxml.jackson.module.scala.introspect.ScalaAnnotationIntrospectorModule.getRegisteredReferencedValueType"),
ProblemFilters.exclude[DirectMissingMethodProblem]("com.fasterxml.jackson.module.scala.introspect.ScalaAnnotationIntrospector#ScalaValueInstantiator.this"),
ProblemFilters.exclude[DirectMissingMethodProblem]("com.fasterxml.jackson.module.scala.deser.NumberDeserializers.BigIntClass"),
ProblemFilters.exclude[DirectMissingMethodProblem]("com.fasterxml.jackson.module.scala.deser.NumberDeserializers.BigDecimalClass")
ProblemFilters.exclude[DirectMissingMethodProblem]("com.fasterxml.jackson.module.scala.deser.NumberDeserializers.BigDecimalClass"),
ProblemFilters.exclude[IncompatibleResultTypeProblem]("com.fasterxml.jackson.module.scala.deser.BigDecimalDeserializer.deserialize"),
ProblemFilters.exclude[IncompatibleResultTypeProblem]("com.fasterxml.jackson.module.scala.deser.BigIntDeserializer.deserialize"),
ProblemFilters.exclude[MissingTypesProblem]("com.fasterxml.jackson.module.scala.deser.BigDecimalDeserializer$"),
ProblemFilters.exclude[MissingTypesProblem]("com.fasterxml.jackson.module.scala.deser.BigIntDeserializer$"),
ProblemFilters.exclude[MissingClassProblem]("com.fasterxml.jackson.module.scala.deser.BigNumberDeserializer")
)
Original file line number Diff line number Diff line change
Expand Up @@ -2,56 +2,29 @@ package com.fasterxml.jackson
package module.scala
package deser

import com.fasterxml.jackson.core.JsonToken.{START_ARRAY, VALUE_NUMBER_FLOAT, VALUE_NUMBER_INT, VALUE_STRING}
import com.fasterxml.jackson.core.io.BigDecimalParser
import com.fasterxml.jackson.core.{JsonParser, JsonToken}
import com.fasterxml.jackson.databind.DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS
import com.fasterxml.jackson.core.JsonParser
import com.fasterxml.jackson.databind.deser.Deserializers
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer
import com.fasterxml.jackson.databind._
import com.fasterxml.jackson.databind.deser.std.NumberDeserializers.{
BigDecimalDeserializer => JavaBigDecimalDeserializer, BigIntegerDeserializer
}

import scala.reflect.{ClassTag, classTag}

private abstract class BigNumberDeserializer[T >: Null : ClassTag](creator: (String) => T)
extends StdScalarDeserializer[T](classTag[T].runtimeClass)
{
override def deserialize(jp: JsonParser, ctxt: DeserializationContext): T = {
val t = jp.getCurrentToken
t match {
case VALUE_NUMBER_INT | VALUE_NUMBER_FLOAT => creator(jp.getText.trim)
case VALUE_STRING =>
val text = jp.getText.trim
if (text.isEmpty) None.orNull else try {
creator(text)
}
catch {
case _: IllegalArgumentException => throw ctxt.weirdStringException(text, _valueClass, "not a valid representation")
}
case START_ARRAY if ctxt.isEnabled(UNWRAP_SINGLE_VALUE_ARRAYS) =>
jp.nextToken()
val value = deserialize(jp, ctxt)
if (jp.nextToken() != JsonToken.END_ARRAY) {
throw ctxt.wrongTokenException(jp, ctxt.getContextualType, JsonToken.END_ARRAY, "Attempted to unwrap array for single value but there was more than a single value in the array")
}
value
case _ =>
ctxt.handleUnexpectedToken(_valueClass, jp).asInstanceOf[T]
}
private object BigDecimalDeserializer extends StdScalarDeserializer[BigDecimal](classOf[BigDecimal]) {
override def deserialize(p: JsonParser, ctxt: DeserializationContext): BigDecimal = {
JavaBigDecimalDeserializer.instance.deserialize(p, ctxt)
}
}

private object ScalaBigDecimalParser {
def fromString(str: String): BigDecimal = BigDecimalParser.parse(str)
private object BigIntDeserializer extends StdScalarDeserializer[BigInt](classOf[BigInt]) {
override def deserialize(p: JsonParser, ctxt: DeserializationContext): BigInt = {
BigIntegerDeserializer.instance.deserialize(p, ctxt)
}
}

private object BigDecimalDeserializer extends BigNumberDeserializer(ScalaBigDecimalParser.fromString)

private object BigIntDeserializer extends BigNumberDeserializer(BigInt.apply)

private object NumberDeserializers extends Deserializers.Base
{
private val BigDecimalClass = BigDecimalDeserializer.handledType()
private val BigIntClass = BigIntDeserializer.handledType()
private object NumberDeserializers extends Deserializers.Base {
private val BigDecimalClass = classOf[BigDecimal]
private val BigIntClass = classOf[BigInt]

override def findBeanDeserializer(tpe: JavaType, config: DeserializationConfig, beanDesc: BeanDescription): JsonDeserializer[_] =
tpe.getRawClass match {
Expand Down