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avoid reparsing numbers when serializing #1074

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avoid reparsing numbers when serializing #1074

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18 changes: 11 additions & 7 deletions play-json/jvm/src/main/scala/play/api/libs/json/jackson/JacksonJson.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ package play.api.libs.json.jackson

import java.io.InputStream
import java.io.StringWriter
import java.math.BigInteger

import scala.annotation.switch
import scala.annotation.tailrec
Expand All @@ -26,7 +27,9 @@ import com.fasterxml.jackson.databind._
import com.fasterxml.jackson.databind.`type`.TypeFactory
import com.fasterxml.jackson.databind.deser.Deserializers
import com.fasterxml.jackson.databind.module.SimpleModule
import com.fasterxml.jackson.databind.node.BigIntegerNode
import com.fasterxml.jackson.databind.ser.Serializers
import com.fasterxml.jackson.databind.util.TokenBuffer

import play.api.libs.json._

Expand Down Expand Up @@ -67,12 +70,8 @@ sealed class PlayJsonMapperModule(jsonConfig: JsonConfig) extends SimpleModule("
// -- Serializers.

private[jackson] class JsValueSerializer(jsonConfig: JsonConfig) extends JsonSerializer[JsValue] {
import java.math.BigInteger
import java.math.{ BigDecimal => JBigDec }

import com.fasterxml.jackson.databind.node.BigIntegerNode
import com.fasterxml.jackson.databind.node.DecimalNode

private def stripTrailingZeros(bigDec: JBigDec): JBigDec = {
val stripped = bigDec.stripTrailingZeros
if (jsonConfig.bigDecimalSerializerConfig.preserveZeroDecimal && bigDec.scale > 0 && stripped.scale <= 0) {
Expand All @@ -96,10 +95,15 @@ private[jackson] class JsValueSerializer(jsonConfig: JsonConfig) extends JsonSer
val stripped = stripTrailingZeros(v.bigDecimal)
val raw = if (shouldWritePlain) stripped.toPlainString else stripped.toString

if (raw.indexOf('E') < 0 && raw.indexOf('.') < 0)
json.writeTree(new BigIntegerNode(new BigInteger(raw)))
if (raw.exists(c => c == 'E' || c == '.'))
json.writeNumber(raw)
else
json.writeTree(new DecimalNode(new JBigDec(raw)))
json match {
case _: TokenBuffer =>
json.writeTree(new BigIntegerNode(new BigInteger(raw)))
case _ =>
json.writeNumber(raw)
}
}

case JsString(v) => json.writeString(v)
Expand Down
50 changes: 50 additions & 0 deletions play-json/jvm/src/test/scala/play/api/libs/json/JsonSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@

package play.api.libs.json

import java.math.BigInteger
import java.util.Calendar
import java.util.Date
import java.util.TimeZone
Expand Down Expand Up @@ -477,6 +478,55 @@ class JsonSpec extends org.specs2.mutable.Specification {
fromJson[JsonNode](jsNum).map(_.toString).must_==(JsSuccess("12.345"))
}

"Serialize JsNumbers with integers correctly" in {
val numStrings = Seq(
"0",
"1",
"-1",
Int.MaxValue.toString,
Int.MinValue.toString,
Long.MaxValue.toString,
Long.MinValue.toString,
BigInteger.valueOf(Long.MaxValue).add(BigInteger.ONE).toString,
BigInteger.valueOf(Long.MinValue).add(BigInteger.valueOf(-1)).toString
)
numStrings.map { numString =>
val bigDec = new java.math.BigDecimal(numString)
Json.stringify(JsNumber(bigDec)).must_==(bigDec.toString)
}
}

"Serialize JsNumbers with decimal points correctly" in {
val numStrings = Seq(
"0.123",
"1.23456789",
"-1.23456789",
Float.MaxValue.toString,
Float.MinValue.toString,
Double.MaxValue.toString,
Double.MinValue.toString,
java.math.BigDecimal.valueOf(Double.MaxValue).add(java.math.BigDecimal.valueOf(1)).toString,
java.math.BigDecimal.valueOf(Double.MinValue).add(java.math.BigDecimal.valueOf(-1)).toString
)
numStrings.map { numString =>
val bigDec = new java.math.BigDecimal(numString)
Json.stringify(JsNumber(bigDec)).must_==(bigDec.toString)
}
}

"Serialize JsNumbers with e notation correctly" in {
val numStrings = Seq(
"1.23456789012345679012345679e999",
"-1.23456789012345679012345679e999",
"1.23456789012345679012345679e-999",
"-1.23456789012345679012345679e-999"
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)
numStrings.map { numString =>
val bigDec = new java.math.BigDecimal(numString)
Json.stringify(JsNumber(bigDec)).must_==(bigDec.toString)
}
}

"parse from InputStream" in {
val js = Json.obj(
"key1" -> "value1",
Expand Down
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