Lift Framework example source code file (StringField.scala)

This example Lift Framework source code file (StringField.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, full, int, int, jstring, jvalue, ownertype, ownertype, record, string, stringtypedfield, valuetype, valuetype

The Lift Framework StringField.scala source code

/*
 * Copyright 2007-2011 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 record
package field

import xml._

import common._
import json._
import util._
import Helpers._
import http.js._
import http.S
import S._
import JE._


trait StringTypedField extends TypedField[String] with StringValidators {
  val maxLength: Int

  def maxLen = maxLength
  
  def setFromAny(in: Any): Box[String] = in match {
    case seq: Seq[_] if !seq.isEmpty => setFromAny(seq.head)
    case _ => genericSetFromAny(in)
  }

  def setFromString(s: String): Box[String] = s match {
    case "" if optional_? => setBox(Empty)
    case _                => setBox(Full(s))
  }

  private def elem = S.fmapFunc(SFuncHolder(this.setFromAny(_))) {
    funcName =>
    <input type="text" maxlength={maxLength.toString}
      name={funcName}
      value={valueBox openOr ""}
      tabindex={tabIndex toString}/>
  }

  def toForm: Box[NodeSeq] =
    uniqueFieldId match {
      case Full(id) => Full(elem % ("id" -> id))
      case _ => Full(elem)
    }


  def defaultValue = ""

  def asJs = valueBox.map(Str) openOr JsNull

  def asJValue: JValue = valueBox.map(v => JString(v)) openOr (JNothing: JValue)
  def setFromJValue(jvalue: JValue): Box[MyType] = jvalue match {
    case JNothing|JNull if optional_? => setBox(Empty)
    case JString(s)                   => setFromString(s)
    case other                        => setBox(FieldHelpers.expectedA("JString", other))
  }
}

class StringField[OwnerType <: Record[OwnerType]](rec: OwnerType, val maxLength: Int)
  extends Field[String, OwnerType] with MandatoryTypedField[String] with StringTypedField {

  def this(rec: OwnerType, maxLength: Int, value: String) = {
    this(rec, maxLength)
    set(value)
  }

  def this(rec: OwnerType, value: String) = {
    this(rec, 100)
    set(value)
  }

  def owner = rec

  protected def valueTypeToBoxString(in: ValueType): Box[String] = toBoxMyType(in)
  protected def boxStrToValType(in: Box[String]): ValueType = toValueType(in)
}

abstract class UniqueIdField[OwnerType <: Record[OwnerType]](rec: OwnerType, override val maxLength: Int) extends StringField[OwnerType](rec, maxLength) {
  override lazy val defaultValue = randomString(maxLen)

  def reset(): OwnerType = this(randomString(maxLen))
}


class OptionalStringField[OwnerType <: Record[OwnerType]](rec: OwnerType, val maxLength: Int)
  extends Field[String, OwnerType] with OptionalTypedField[String] with StringTypedField {

  def this(rec: OwnerType, maxLength: Int, value: Box[String]) = {
    this(rec, maxLength)
    setBox(value)
  }

  def this(rec: OwnerType, value: Box[String]) = {
    this(rec, 100)
    setBox(value)
  }

  def owner = rec

  protected def valueTypeToBoxString(in: ValueType): Box[String] = toBoxMyType(in)
  protected def boxStrToValType(in: Box[String]): ValueType = toValueType(in)
}