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/*
* Original implementation (C) 2009-2011 Debasish Ghosh
* Adapted and extended in 2011 by Mathias Doenitz
*
* 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.reflect.ClassTag
trait CollectionFormats {
/**
* Supplies the JsonFormat for Lists.
*/
implicit def listFormat[T :JsonFormat] = new RootJsonFormat[List[T]] {
def write(list: List[T]) = JsArray(list.map(_.toJson).toVector)
def read(value: JsValue): List[T] = value match {
case JsArray(elements) => elements.map(_.convertTo[T])(collection.breakOut)
case x => deserializationError("Expected List as JsArray, but got " + x)
}
}
/**
* Supplies the JsonFormat for Arrays.
*/
implicit def arrayFormat[T :JsonFormat :ClassTag] = new RootJsonFormat[Array[T]] {
def write(array: Array[T]) = JsArray(array.map(_.toJson).toVector)
def read(value: JsValue) = value match {
case JsArray(elements) => elements.map(_.convertTo[T]).toArray[T]
case x => deserializationError("Expected Array as JsArray, but got " + x)
}
}
/**
* Supplies the JsonFormat for Maps. The implicitly available JsonFormat for the key type K must
* always write JsStrings, otherwise a [[spray.json.SerializationException]] will be thrown.
*/
implicit def mapFormat[K :JsonFormat, V :JsonFormat] = new RootJsonFormat[Map[K, V]] {
def write(m: Map[K, V]) = JsObject {
m.map { field =>
field._1.toJson match {
case JsString(x) => x -> field._2.toJson
case x => throw new SerializationException("Map key must be formatted as JsString, not '" + x + "'")
}
}
}
def read(value: JsValue) = value match {
case x: JsObject => x.fields.map { field =>
(JsString(field._1).convertTo[K], field._2.convertTo[V])
} (collection.breakOut)
case x => deserializationError("Expected Map as JsObject, but got " + x)
}
}
import collection.{immutable => imm}
implicit def immIterableFormat[T :JsonFormat] = viaSeq[imm.Iterable[T], T](seq => imm.Iterable(seq :_*))
implicit def immSeqFormat[T :JsonFormat] = viaSeq[imm.Seq[T], T](seq => imm.Seq(seq :_*))
implicit def immIndexedSeqFormat[T :JsonFormat] = viaSeq[imm.IndexedSeq[T], T](seq => imm.IndexedSeq(seq :_*))
implicit def immLinearSeqFormat[T :JsonFormat] = viaSeq[imm.LinearSeq[T], T](seq => imm.LinearSeq(seq :_*))
implicit def immSetFormat[T :JsonFormat] = viaSeq[imm.Set[T], T](seq => imm.Set(seq :_*))
implicit def vectorFormat[T :JsonFormat] = viaSeq[Vector[T], T](seq => Vector(seq :_*))
import collection._
implicit def iterableFormat[T :JsonFormat] = viaSeq[Iterable[T], T](seq => Iterable(seq :_*))
implicit def seqFormat[T :JsonFormat] = viaSeq[Seq[T], T](seq => Seq(seq :_*))
implicit def indexedSeqFormat[T :JsonFormat] = viaSeq[IndexedSeq[T], T](seq => IndexedSeq(seq :_*))
implicit def linearSeqFormat[T :JsonFormat] = viaSeq[LinearSeq[T], T](seq => LinearSeq(seq :_*))
implicit def setFormat[T :JsonFormat] = viaSeq[Set[T], T](seq => Set(seq :_*))
/**
* A JsonFormat construction helper that creates a JsonFormat for an Iterable type I from a builder function
* List => I.
*/
def viaSeq[I <: Iterable[T], T :JsonFormat](f: imm.Seq[T] => I): RootJsonFormat[I] = new RootJsonFormat[I] {
def write(iterable: I) = JsArray(iterable.map(_.toJson).toVector)
def read(value: JsValue) = value match {
case JsArray(elements) => f(elements.map(_.convertTo[T]))
case x => deserializationError("Expected Collection as JsArray, but got " + x)
}
}
}
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