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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 cc.spray.json
trait CollectionFormats {
/**
* Supplies the JsonFormat for Lists.
*/
implicit def listFormat[T :JsonFormat] = new JsonFormat[List[T]] {
def write(list: List[T]) = JsArray(list.map(_.toJson))
def read(value: JsValue) = value match {
case JsArray(elements) => elements.map(_.convertTo[T])
case _ => throw new DeserializationException("List expected")
}
}
/**
* Supplies the JsonFormat for Arrays.
*/
implicit def arrayFormat[T :JsonFormat :ClassManifest] = new JsonFormat[Array[T]] {
def write(array: Array[T]) = JsArray(array.map(_.toJson).toList)
def read(value: JsValue) = value match {
case JsArray(elements) => elements.map(_.convertTo[T]).toArray[T]
case _ => throw new DeserializationException("Array expected")
}
}
/**
* Supplies the JsonFormat for Maps. The implicitly available JsonFormat for the key type K must
* always write JsStrings, otherwise a [[cc.spray.json.SerializationException]] will be thrown.
*/
implicit def mapFormat[K :JsonFormat, V :JsonFormat] = new JsonFormat[Map[K, V]] {
def write(m: Map[K, V]) = JsObject {
m.toList.map { t =>
t._1.toJson match {
case JsString(x) => JsField(x, t._2.toJson)
case x => throw new SerializationException("Map key must be formatted as JsString, not '" + x + "'")
}
}
}
def read(value: JsValue) = value match {
case JsObject(fields) => fields.map(field => (JsString(field.name).convertTo[K], field.value.convertTo[V])).toMap
case _ => throw new DeserializationException("Map expected")
}
}
import collection.{immutable => imm}
implicit def immIterableFormat[T :JsonFormat] = viaList[imm.Iterable[T], T](list => imm.Iterable(list :_*))
implicit def immSeqFormat[T :JsonFormat] = viaList[imm.Seq[T], T](list => imm.Seq(list :_*))
implicit def immIndexedSeqFormat[T :JsonFormat] = viaList[imm.IndexedSeq[T], T](list => imm.IndexedSeq(list :_*))
implicit def immLinearSeqFormat[T :JsonFormat] = viaList[imm.LinearSeq[T], T](list => imm.LinearSeq(list :_*))
implicit def immSetFormat[T :JsonFormat] = viaList[imm.Set[T], T](list => imm.Set(list :_*))
implicit def vectorFormat[T :JsonFormat] = viaList[Vector[T], T](list => Vector(list :_*))
import collection._
implicit def iterableFormat[T :JsonFormat] = viaList[Iterable[T], T](list => Iterable(list :_*))
implicit def seqFormat[T :JsonFormat] = viaList[Seq[T], T](list => Seq(list :_*))
implicit def indexedSeqFormat[T :JsonFormat] = viaList[IndexedSeq[T], T](list => IndexedSeq(list :_*))
implicit def linearSeqFormat[T :JsonFormat] = viaList[LinearSeq[T], T](list => LinearSeq(list :_*))
implicit def setFormat[T :JsonFormat] = viaList[Set[T], T](list => Set(list :_*))
/**
* A JsonFormat construction helper that creates a JsonFormat for an Iterable type I from a builder function
* List => I.
*/
def viaList[I <: Iterable[T], T :JsonFormat](f: List[T] => I): JsonFormat[I] = new JsonFormat[I] {
def write(iterable: I) = JsArray(iterable.map(_.toJson).toList)
def read(value: JsValue) = value match {
case JsArray(elements) => f(elements.map(_.convertTo[T]))
case _ => throw new DeserializationException("Collection expected")
}
}
}
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