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Lift Framework example source code file (MongoRefField.scala)

This example Lift Framework source code file (MongoRefField.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

bsonrecord, empty, full, list, mongometarecord, mongometarecord, mongorecord, mongorecord, mongoreffield, mongoreffield, ownertype, ownertype, reftype, string, util

The Lift Framework MongoRefField.scala source code

/*
 * Copyright 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 common.{Box, Empty, Full}
import http.SHtml
import util.Helpers._

import java.util.UUID

import org.bson.types.ObjectId
import net.liftweb.record.TypedField
import net.liftweb.record.field._

/*
 * Trait for creating a Field for storing a "foreign key". Caches the
 * item after fetching. Implementations are available for ObjectId, UUID, String,
 * Int, and Long, but you can mix this into any Field.
 *
 * toForm produces a select form element. You just need to supply the
 * options by overriding the options method.
 */
trait MongoRefField[RefType <: MongoRecord[RefType], MyType] extends TypedField[MyType] {

  /** The MongoMetaRecord of the referenced object **/
  def refMeta: MongoMetaRecord[RefType]

  /*
  * get the referenced object
  */
  def obj = synchronized {
    if (!_calcedObj) {
      _calcedObj = true
      this._obj = valueBox.flatMap(v => refMeta.findAny(v))
    }
    _obj
  }

  def cached_? : Boolean = synchronized { _calcedObj }

  def primeObj(obj: Box[RefType]) = synchronized {
    _obj = obj
    _calcedObj = true
  }

  private var _obj: Box[RefType] = Empty
  private var _calcedObj = false

  /** Options for select list **/
  def options: List[(Box[MyType], String)] = Nil

  /** Label for the selection item representing Empty, show when this field is optional. Defaults to the empty string. */
  def emptyOptionLabel: String = ""

  def buildDisplayList: List[(Box[MyType], String)] = {
    if (optional_?) (Empty, emptyOptionLabel)::options else options
  }

  private def elem = SHtml.selectObj[Box[MyType]](
    buildDisplayList,
    Full(valueBox),
    setBox(_)
  ) % ("tabindex" -> tabIndex.toString)

  override def toForm =
    if (options.length > 0)
      uniqueFieldId match {
        case Full(id) => Full(elem % ("id" -> id))
        case _ => Full(elem)
      }
    else
      Empty
}

class ObjectIdRefField[OwnerType <: BsonRecord[OwnerType], RefType <: MongoRecord[RefType]](
  rec: OwnerType, rm: MongoMetaRecord[RefType]
)
  extends ObjectIdField[OwnerType](rec)
  with MongoRefField[RefType, ObjectId]
{
  def refMeta = rm
}

class UUIDRefField[OwnerType <: BsonRecord[OwnerType], RefType <: MongoRecord[RefType]](
  rec: OwnerType, rm: MongoMetaRecord[RefType]
)
  extends UUIDField[OwnerType](rec)
  with MongoRefField[RefType, UUID]
{
  def refMeta = rm
}

class StringRefField[OwnerType <: BsonRecord[OwnerType], RefType <: MongoRecord[RefType]](
  rec: OwnerType, rm: MongoMetaRecord[RefType], maxLen: Int
)
  extends StringField[OwnerType](rec, maxLen)
  with MongoRefField[RefType, String]
{
  def refMeta = rm
}

class IntRefField[OwnerType <: BsonRecord[OwnerType], RefType <: MongoRecord[RefType]](
  rec: OwnerType, rm: MongoMetaRecord[RefType]
)
  extends IntField[OwnerType](rec)
  with MongoRefField[RefType, Int]
{
  def refMeta = rm
}

class LongRefField[OwnerType <: BsonRecord[OwnerType], RefType <: MongoRecord[RefType]](
  rec: OwnerType, rm: MongoMetaRecord[RefType]
)
  extends LongField[OwnerType](rec)
  with MongoRefField[RefType, Long]
{
  def refMeta = rm
}

Other Lift Framework examples (source code examples)

Here is a short list of links related to this Lift Framework MongoRefField.scala source code file:



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