ProductFormatsInstances.scala.template

/*
 * Copyright (C) 2011,2012 Mathias Doenitz, Johannes Rudolph
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package spray.json

import scala.collection.mutable.HashSet

trait ProductFormatsInstances { self: ProductFormats with StandardFormats =>
  def allowExtraKeys: Boolean = true
[#  // Case classes with 1 parameters

  def jsonFormat1[[#P1 :JF#], T <: Product :ClassManifest](construct: ([#P1#]) => T): RootJsonFormat[T] = {
    val Array([#p1#]) = extractFieldNames(classManifest[T])
    jsonFormat(construct, [#p1#])
  }
  def jsonFormat[[#P1 :JF#], T <: Product](construct: ([#P1#]) => T, [#fieldName1: String#]): RootJsonFormat[T] = new RootJsonFormat[T]{
    val knownFields = HashSet[String]()
    [# knownFields.add(fieldName1)#
    ]

    def write(p: T) = {
      val fields = new collection.mutable.ListBuffer[(String, JsValue)]
      fields.sizeHint(1 * 2)
      [#fields ++= productElement##2Field[P1](fieldName1, p, 0)#
      ]
      JsObject(fields: _*)
    }
    def read(value: JsValue) = {
      [#val p1V = fromField[P1](value, fieldName1)#
      ]
      if (!allowExtraKeys) {
        val jsObject = value.asJsObject()
        val keySet = jsObject.fields.keys.toSet
        val keySetDiff = keySet.diff(knownFields)
        if (!keySetDiff.isEmpty) {
          throw new DeserializationException(s"${keySetDiff.head} is not a known key", null, keySetDiff.toList)
        }
      }
      construct([#p1V#])
    }
  }#


]
}