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Lift Framework example source code file (JObjectParser.scala)

This example Lift Framework source code file (JObjectParser.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

basicdblist, basicdbobject, formats, formats, jint, jnothing, jobject, jobject, jstring, jstring, jvalue, list, nil, nil, regex, util

The Lift Framework JObjectParser.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

import scala.collection.JavaConversions._

import java.util.{Date, UUID}
import java.util.regex.Pattern

import net.liftweb.json._
import net.liftweb.common.Box

import com.mongodb.{BasicDBObject, BasicDBList, DBObject}
import org.bson.types.ObjectId

object JObjectParser {

  /*
  * Parse a JObject into a DBObject
  */
  def parse(jo: JObject)(implicit formats: Formats): DBObject =
    Parser.parse(jo, formats)

  /*
  * Serialize a DBObject into a JObject
  */
  def serialize(a: Any)(implicit formats: Formats): JValue = serialize(a, formats)

  private def serialize(a: Any, formats: Formats): JValue = {
    import Meta.Reflection._
    a.asInstanceOf[AnyRef] match {
      case null => JNull
      case x if primitive_?(x.getClass) => primitive2jvalue(x)
      case x if datetype_?(x.getClass) => datetype2jvalue(x)(formats)
      case x if mongotype_?(x.getClass) => mongotype2jvalue(x)(formats)
      case x: BasicDBList => JArray(x.toList.map( x => serialize(x, formats)))
      case x: BasicDBObject => JObject(
        x.keySet.toList.map { f =>
          JField(f.toString, serialize(x.get(f.toString), formats))
        }
      )
      case x => {
        JNothing
      }
    }
  }

  object Parser {

    def parse(jo: JObject, formats: Formats): DBObject = {
      parseObject(jo.obj, formats)
    }

    private def parseArray(arr: List[JValue], formats: Formats): BasicDBList = {
      val dbl = new BasicDBList
      trimArr(arr).foreach { a =>
        a match {
          case JObject(JField("$oid", JString(s)) :: Nil) if (ObjectId.isValid(s)) =>
            dbl.add(new ObjectId(s))
          case JObject(JField("$regex", JString(s)) :: JField("$flags", JInt(f)) :: Nil) =>
            dbl.add(Pattern.compile(s, f.intValue))
          case JObject(JField("$dt", JString(s)) :: Nil) =>
            formats.dateFormat.parse(s) foreach { d => dbl.add(d) }
          case JObject(JField("$uuid", JString(s)) :: Nil) =>
            dbl.add(UUID.fromString(s))
          case JArray(arr) => dbl.add(parseArray(arr, formats))
          case JObject(jo) => dbl.add(parseObject(jo, formats))
          case jv: JValue => dbl.add(renderValue(jv, formats))
        }
      }
      dbl
    }

    private def parseObject(obj: List[JField], formats: Formats): BasicDBObject = {
      val dbo = new BasicDBObject
      trimObj(obj).foreach { jf =>
        jf.value match {
          case JObject(JField("$oid", JString(s)) :: Nil) if (ObjectId.isValid(s)) =>
            dbo.put(jf.name, new ObjectId(s))
          case JObject(JField("$regex", JString(s)) :: JField("$flags", JInt(f)) :: Nil) =>
            dbo.put(jf.name, Pattern.compile(s, f.intValue))
          case JObject(JField("$dt", JString(s)) :: Nil) =>
            formats.dateFormat.parse(s) foreach { d => dbo.put(jf.name, d) }
          case JObject(JField("$uuid", JString(s)) :: Nil) =>
            dbo.put(jf.name, UUID.fromString(s))
          case JArray(arr) => dbo.put(jf.name, parseArray(arr, formats))
          case JObject(jo) => dbo.put(jf.name, parseObject(jo, formats))
          case jv: JValue => dbo.put(jf.name, renderValue(jv, formats))
        }
      }
      dbo
    }

    private def renderValue(jv: JValue, formats: Formats): Object = jv match {
      case JBool(b) => java.lang.Boolean.valueOf(b)
      case JInt(n) => renderInteger(n)
      case JDouble(n) => new java.lang.Double(n)
      case JNull => null
      case JNothing => error("can't render 'nothing'")
      case JString(null) => "null"
      case JString(s) if (ObjectId.isValid(s)) => new ObjectId(s)
      case JString(s) => s
      case _ =>  ""
    }

    // FIXME: This is not ideal.
    private def renderInteger(i: BigInt): Object = {
      if (i <= java.lang.Integer.MAX_VALUE && i >= java.lang.Integer.MIN_VALUE) {
        new java.lang.Integer(i.intValue)
      }
      else if (i <= java.lang.Long.MAX_VALUE && i >= java.lang.Long.MIN_VALUE) {
        new java.lang.Long(i.longValue)
      }
      else {
        i.toString
      }
    }

    private def trimArr(xs: List[JValue]) = xs.filter(_ != JNothing)
    private def trimObj(xs: List[JField]) = xs.filter(_.value != JNothing)
  }
}

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