Some more JSON formatters and json,rest packages rearranged

1 files changed, 87 insertions, 0 deletions

diff --git a/src/main/scala/com/drivergrp/core/json.scala b/src/main/scala/com/drivergrp/core/json.scala
new file mode 100644
index 0000000..6828a07
--- /dev/null
+++ b/src/main/scala/com/drivergrp/core/json.scala
@@ -0,0 +1,87 @@
+package com.drivergrp.core
+
+import akka.http.scaladsl.model.Uri.Path
+import akka.http.scaladsl.server.PathMatcher.Matched
+import akka.http.scaladsl.server.{PathMatcher, _}
+import com.drivergrp.core.time.Time
+import spray.json.{DeserializationException, JsNumber, _}
+
+import scala.reflect.runtime.universe._
+
+object json {
+
+  def IdInPath[T]: PathMatcher1[Id[T]] =
+    PathMatcher("""[+-]?\d*""".r) flatMap { string =>
+      try Some(Id[T](string.toLong))
+      catch { case _: IllegalArgumentException => None }
+    }
+
+  implicit def idFormat[T] = new RootJsonFormat[Id[T]] {
+    def write(id: Id[T]) = JsNumber(id)
+
+    def read(value: JsValue) = value match {
+      case JsNumber(id) => Id[T](id.toLong)
+      case _            => throw new DeserializationException("Id expects number")
+    }
+  }
+
+  def NameInPath[T]: PathMatcher1[Name[T]] = new PathMatcher1[Name[T]] {
+    def apply(path: Path) = Matched(Path.Empty, Tuple1(Name[T](path.toString)))
+  }
+
+  implicit def nameFormat[T] = new RootJsonFormat[Name[T]] {
+    def write(name: Name[T]) = JsString(name)
+
+    def read(value: JsValue): Name[T] = value match {
+      case JsString(name) => Name[T](name)
+      case _              => throw new DeserializationException("Name expects string")
+    }
+  }
+
+  def TimeInPath: PathMatcher1[Time] =
+    PathMatcher("""[+-]?\d*""".r) flatMap { string =>
+      try Some(Time(string.toLong))
+      catch { case _: IllegalArgumentException => None }
+    }
+
+  implicit val timeFormat = new RootJsonFormat[Time] {
+    def write(time: Time) = JsObject("timestamp" -> JsNumber(time.millis))
+
+    def read(value: JsValue): Time = value match {
+      case JsObject(fields) =>
+        fields
+          .get("timestamp")
+          .flatMap {
+            case JsNumber(millis) => Some(Time(millis.toLong))
+            case _                => None
+          }
+          .getOrElse(throw new DeserializationException("Time expects number"))
+      case _ => throw new DeserializationException("Time expects number")
+    }
+  }
+
+  class EnumJsonFormat[T](mapping: (String, T)*) extends JsonFormat[T] {
+    private val map = mapping.toMap
+
+    override def write(value: T): JsValue = {
+      map.find(_._2 == value).map(_._1) match {
+        case Some(name) => JsString(name)
+        case _          => serializationError(s"Value $value is not found in the mapping $map")
+      }
+    }
+
+    override def read(json: JsValue): T = json match {
+      case JsString(name) =>
+        map.getOrElse(name, throw new DeserializationException(s"Value $name is not found in the mapping $map"))
+      case _ => deserializationError("Expected string as enumeration value, but got " + json)
+    }
+  }
+
+  class ValueClassFormat[T: TypeTag](writeValue: T => BigDecimal, create: BigDecimal => T) extends JsonFormat[T] {
+    def write(valueClass: T) = JsNumber(writeValue(valueClass))
+    def read(json: JsValue): T = json match {
+      case JsNumber(value) => create(value)
+      case _               => deserializationError(s"Expected number as ${typeOf[T].getClass.getName}, but got " + json)
+    }
+  }
+}