Lift Framework example source code file (MongoMapField.scala)

This example Lift Framework source code file (MongoMapField.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, full, jnothing, jobject, jvalue, map, map, mapvaluetype, mapvaluetype, ownertype, string, string

The Lift Framework MongoMapField.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

import net.liftweb.common.{Box, Empty, Failure, Full}
import net.liftweb.http.js.JE.{JsNull, JsRaw}
import net.liftweb.json.JsonAST._
import net.liftweb.json.{JsonParser, Printer}
import net.liftweb.record._
import net.liftweb.util.Helpers.tryo

import com.mongodb._

class MongoMapField[OwnerType <: BsonRecord[OwnerType], MapValueType](rec: OwnerType)
  extends Field[Map[String, MapValueType], OwnerType] with MandatoryTypedField[Map[String, MapValueType]]
  with MongoFieldFlavor[Map[String, MapValueType]] {

  import Meta.Reflection._

  def owner = rec

  def defaultValue = Map[String, MapValueType]()

  def setFromAny(in: Any): Box[Map[String, MapValueType]] = {
    in match {
      case dbo: DBObject => setFromDBObject(dbo)
      case map: Map[String, MapValueType] => setBox(Full(map))
      case Some(map: Map[String, MapValueType]) => setBox(Full(map))
      case Full(map: Map[String, MapValueType]) => setBox(Full(map))
      case (map: Map[String, MapValueType]) :: _ => setBox(Full(map))
      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)
    }
  }

  def setFromJValue(jvalue: JValue) = jvalue match {
    case JNothing|JNull if optional_? => setBox(Empty)
    case JObject(obj) => setBox(Full(
      Map() ++ obj.map(jf => (jf.name, jf.value.values.asInstanceOf[MapValueType]))
    ))
    case other => setBox(FieldHelpers.expectedA("JObject", other))
  }

  def setFromString(in: String): Box[Map[String, MapValueType]] = 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))
  }

  def toForm: Box[NodeSeq] = Empty

  def asJValue = JObject(value.keys.map {
    k =>
      JField(k, value(k).asInstanceOf[AnyRef] match {
        case x if primitive_?(x.getClass) => primitive2jvalue(x)
        case x if mongotype_?(x.getClass) => mongotype2jvalue(x)(owner.meta.formats)
        case x if datetype_?(x.getClass) => datetype2jvalue(x)(owner.meta.formats)
        case _ => JNothing
      })
  }.toList)

  /*
  * Convert this field's value into a DBObject so it can be stored in Mongo.
  */
  def asDBObject: DBObject = {
    val dbo = new BasicDBObject
    value.keys.foreach { k =>
      dbo.put(k.toString, value.getOrElse(k, ""))
    }
    dbo
  }

  // set this field's value using a DBObject returned from Mongo.
  def setFromDBObject(dbo: DBObject): Box[Map[String, MapValueType]] = {
    import scala.collection.JavaConversions._

    setBox(Full(
      Map() ++ dbo.keySet.map {
        k => (k.toString, dbo.get(k).asInstanceOf[MapValueType])
      }
    ))
  }
}