com.dslplatform.json.runtime.ScalaMapMutableDecoder.scala Maven / Gradle / Ivy

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DSL-JSON Scala

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package com.dslplatform.json
package runtime

import java.lang.reflect.Type

import scala.collection.mutable

final class ScalaMapMutableDecoder[K, V](
  manifest: Type,
  keyDecoder: JsonReader.ReadObject[K],
  valueDecoder: JsonReader.ReadObject[V],
  finalize: mutable.LinkedHashMap[K, V] => scala.collection.Map[K, V]
) extends JsonReader.ReadObject[scala.collection.Map[K, V]] {
  require(manifest ne null, "manifest can't be null")
  require(keyDecoder ne null, "keyDecoder can't be null")
  require(valueDecoder ne null, "valueDecoder can't be null")
  require(finalize ne null, "finalize can't be null")

  override def read(reader: JsonReader[_]): scala.collection.Map[K, V] = {
    if (reader.last != '{') throw reader.newParseError("Expecting '{' for map start")
    val result = new mutable.LinkedHashMap[K, V]
    if (reader.getNextToken() == '}') finalize(result)
    else {
      var key = keyDecoder.read(reader)
      if (key == null) {
        throw reader.newParseErrorFormat(
          "Null value detected for key element of map",
          0,
          "Null value detected for key element of %s", manifest.getTypeName)
      }
      if (reader.getNextToken() != ':') throw reader.newParseError("Expecting ':' after attribute name")
      reader.getNextToken()
      var value = valueDecoder.read(reader)
      result += key -> value
      while (reader.getNextToken() == ',') {
        reader.getNextToken()
        key = keyDecoder.read(reader)
        if (key == null) {
          throw reader.newParseErrorFormat(
            "Null value detected for key element of map",
            0,
            "Null value detected for key element of %s", manifest.getTypeName)
        }
        if (reader.getNextToken() != ':') throw reader.newParseError("Expecting ':' after attribute name")
        reader.getNextToken()
        value = valueDecoder.read(reader)
        result += key -> value
      }
      if (reader.last != '}') throw reader.newParseError("Expecting '}' for map end")
      finalize(result)
    }
  }
}