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Lift Framework example source code file (JsonScalaz.scala)
The Lift Framework JsonScalaz.scala source code/* * Copyright 2009-2010 WorldWide Conferencing, LLC * * 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 net.liftweb.json.scalaz import scalaz._ import Scalaz._ import net.liftweb.json._ trait Types { type Result[A] = ValidationNEL[Error, A] sealed trait Error case class UnexpectedJSONError(was: JValue, expected: Class[_ <: JValue]) extends Error case class NoSuchFieldError(name: String, json: JValue) extends Error case class UncategorizedError(key: String, desc: String, args: List[Any]) extends Error case object Fail { def apply[A](key: String, desc: String, args: List[Any]): Result[A] = UncategorizedError(key, desc, args).fail.liftFailNel def apply[A](key: String, desc: String): Result[A] = UncategorizedError(key, desc, Nil).fail.liftFailNel } implicit def JValueShow[A <: JValue]: Show[A] = new Show[A] { def show(json: A) = compact(render(json)).toList } implicit def JValueZero: Zero[JValue] = zero(JNothing) implicit def JValueSemigroup: Semigroup[JValue] = semigroup(_ ++ _) implicit def JValueEqual: Equal[JValue] = equalA trait JSONR[A] { def read(json: JValue): Result[A] } trait JSONW[A] { def write(value: A): JValue } trait JSON[A] extends JSONR[A] with JSONW[A] implicit def Result2JSONR[A](f: JValue => Result[A]): JSONR[A] = new JSONR[A] { def read(json: JValue) = f(json) } def fromJSON[A: JSONR](json: JValue): Result[A] = implicitly[JSONR[A]].read(json) def toJSON[A: JSONW](value: A): JValue = implicitly[JSONW[A]].write(value) def field[A: JSONR](name: String)(json: JValue): Result[A] = json match { case JObject(fs) => fs.find(_.name == name) .map(f => implicitly[JSONR[A]].read(f.value)) .orElse(implicitly[JSONR[A]].read(JNothing).fold(_ => none, x => some(Success(x)))) .getOrElse(NoSuchFieldError(name, json).fail.liftFailNel) case x => UnexpectedJSONError(x, classOf[JObject]).fail.liftFailNel } def validate[A: JSONR](name: String): Kleisli[Result, JValue, A] = kleisli(field[A](name)) def makeObj(fields: Traversable[(String, JValue)]): JObject = JObject(fields.toList.map { case (n, v) => JField(n, v) }) } object JsonScalaz extends Types with Lifting with Base with Tuples Other Lift Framework examples (source code examples)Here is a short list of links related to this Lift Framework JsonScalaz.scala source code file: |
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