Lift Framework example source code file (Meta.scala)

This example Lift Framework source code file (Meta.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

any, class, date, formats, formats, jint, jint, jobject, jobject, jvalue, jvalue, nil, objectid, regex, set, util

The Lift Framework Meta.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 json._

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

import org.bson.types.ObjectId

private[mongodb] object Meta {

  /*
  * For converting scala objects into DBObject values
  */
  object Reflection {
    import java.lang.reflect._
    import com.mongodb.{BasicDBObject, DBRef}

    /*
    * These don't require a conversion and can be put directly into a DBObject
    */
    val primitives = Set[Class[_]](classOf[String], classOf[Int], classOf[Long], classOf[Double],
                                  classOf[Float], classOf[Byte], classOf[BigInt], classOf[Boolean],
                                  classOf[Short], classOf[java.lang.Integer], classOf[java.lang.Long],
                                  classOf[java.lang.Double], classOf[java.lang.Float],
                                  classOf[java.lang.Byte], classOf[java.lang.Boolean],
                                  classOf[java.lang.Short])

    def primitive_?(clazz: Class[_]) = primitives contains clazz

    /*
    * This is used to convert DBObjects into JObjects
    */
    def primitive2jvalue(a: Any) = a match {
      case x: String => JString(x)
      case x: Int => JInt(x)
      case x: Long => JInt(x)
      case x: Double => JDouble(x)
      case x: Float => JDouble(x)
      case x: Byte => JInt(BigInt(x))
      case x: BigInt => JInt(x)
      case x: Boolean => JBool(x)
      case x: Short => JInt(BigInt(x))
      case x: java.lang.Integer => JInt(BigInt(x.asInstanceOf[Int]))
      case x: java.lang.Long => JInt(BigInt(x.asInstanceOf[Long]))
      case x: java.lang.Double => JDouble(x.asInstanceOf[Double])
      case x: java.lang.Float => JDouble(x.asInstanceOf[Float])
      case x: java.lang.Byte => JInt(BigInt(x.asInstanceOf[Byte]))
      case x: java.lang.Boolean => JBool(x.asInstanceOf[Boolean])
      case x: java.lang.Short => JInt(BigInt(x.asInstanceOf[Short]))
      case _ => error("not a primitive " + a.asInstanceOf[AnyRef].getClass)
    }

    /*
    * Date types require formatting
    */
    val datetypes = Set[Class[_]](classOf[Calendar], classOf[Date], classOf[GregorianCalendar])

    def datetype_?(clazz: Class[_]) = datetypes contains clazz

    def datetype2jvalue(a: Any)(implicit formats: Formats) = a match {
      case x: Calendar => dateAsJValue(x.getTime, formats)
      case x: Date => dateAsJValue(x, formats)
    }

    def datetype2dbovalue(a: Any) = a match {
      case x: Calendar => x.getTime
      case x: Date => x
    }

    /*
    * Extended Mongo types.
    */
    val mongotypes = Set[Class[_]](
      classOf[DBRef], classOf[ObjectId], classOf[Pattern], classOf[UUID])

    def mongotype_?(clazz: Class[_]) = mongotypes contains clazz

    /*
    * Definitive place for JValue conversion of mongo types
    */
    def mongotype2jvalue(a: Any)(implicit formats: Formats) = a match {
      case x: ObjectId => objectIdAsJValue(x, formats)
      case x: Pattern => patternAsJValue(x)
      case x: UUID => uuidAsJValue(x)
      case x: DBRef => error("DBRefs are not supported.")
      case _ => error("not a mongotype " + a.asInstanceOf[AnyRef].getClass)
    }
  }

  def dateAsJValue(d: Date, formats: Formats) = JObject(JField("$dt", JString(formats.dateFormat.format(d))) :: Nil)
  def objectIdAsJValue(oid: ObjectId): JValue = JObject(JField("$oid", JString(oid.toString)) :: Nil)
  def patternAsJValue(p: Pattern): JValue = JObject(JField("$regex", JString(p.pattern)) :: JField("$flags", JInt(p.flags)) :: Nil)
  def uuidAsJValue(u: UUID): JValue = JObject(JField("$uuid", JString(u.toString)) :: Nil)

  def objectIdAsJValue(oid: ObjectId, formats: Formats): JValue =
    if (isObjectIdSerializerUsed(formats))
      objectIdAsJValue(oid)
    else
      JString(oid.toString)

  /*
  * Check to see if the ObjectIdSerializer is being used.
  */
  private def isObjectIdSerializerUsed(formats: Formats): Boolean =
    formats.customSerializers.exists(_.getClass == objectIdSerializerClass)

  private val objectIdSerializerClass = classOf[net.liftweb.mongodb.ObjectIdSerializer]
}