Lift Framework example source code file (JsonObjectField.scala)

This example Lift Framework source code file (JsonObjectField.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lift Framework tags/keywords

box, box, dbobject, failure, full, jobject, jobjecttype, jobjecttype, jvalue, jvalue, ownertype, some, string, string

The Lift Framework JsonObjectField.scala source code

/*
* Copyright 2010-2011 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
package mongodb
package record
package field

import scala.xml.{NodeSeq, Text}

import net.liftweb.common.{Box, Empty, Failure, Full}

import net.liftweb.http.js.JE.{JsNull, Str}
import net.liftweb.json.JsonAST._
import net.liftweb.json.{JsonParser, Printer}
import net.liftweb.record.{Field, FieldHelpers, MandatoryTypedField, Record}
import net.liftweb.util.Helpers.tryo

import com.mongodb.DBObject

abstract class JsonObjectField[OwnerType <: BsonRecord[OwnerType], JObjectType <: JsonObject[JObjectType]]
  (rec: OwnerType, valueMeta: JsonObjectMeta[JObjectType])
  extends Field[JObjectType, OwnerType] with MandatoryTypedField[JObjectType] with MongoFieldFlavor[JObjectType] {

  def owner = rec

  implicit val formats = owner.meta.formats

  /**
   * Convert the field value to an XHTML representation
   */
  override def toForm: Box[NodeSeq] = Empty // FIXME

  /** Encode the field value into a JValue */
  def asJValue: JValue = value.asJObject

  /*
  * Decode the JValue and set the field to the decoded value.
  * Returns Empty or Failure if the value could not be set
  */
  def setFromJValue(jvalue: JValue): Box[JObjectType] = jvalue match {
    case JNothing|JNull if optional_? => setBox(Empty)
    case o: JObject => setBox(tryo(valueMeta.create(o)))
    case other => setBox(FieldHelpers.expectedA("JObject", other))
  }

  def setFromAny(in: Any): Box[JObjectType] = in match {
    case dbo: DBObject => setFromDBObject(dbo)
    case value: JObjectType => setBox(Full(value))
    case Some(value: JObjectType) => setBox(Full(value))
    case Full(value: JObjectType) => setBox(Full(value))
    case (value: JObjectType) :: _ => setBox(Full(value))
    case s: String => setFromString(s)
    case Some(s: String) => setFromString(s)
    case Full(s: String) => setFromString(s)
    case null|None|Empty => setBox(defaultValueBox)
    case f: Failure => setBox(f)
    case o => setFromString(o.toString)
  }

  // parse String into a JObject
  def setFromString(in: String): Box[JObjectType] = tryo(JsonParser.parse(in)) match {
    case Full(jv: JValue) => setFromJValue(jv)
    case f: Failure => setBox(f)
    case other => setBox(Failure("Error parsing String into a JValue: "+in))
  }

  /*
  * Convert this field's value into a DBObject so it can be stored in Mongo.
  */
  def asDBObject: DBObject = JObjectParser.parse(asJValue.asInstanceOf[JObject])

  // set this field's value using a DBObject returned from Mongo.
  def setFromDBObject(dbo: DBObject): Box[JObjectType] =
    setFromJValue(JObjectParser.serialize(dbo).asInstanceOf[JObject])
}