Lift Framework example source code file (EnumWithDescription.scala)

This example Lift Framework source code file (EnumWithDescription.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

enumeration, enumwithdescription, list, list, nil, string, string, val, value, value, valuewithdescription, valuewithdescription

The Lift Framework EnumWithDescription.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 util 

/*
 A wrapper arround a Scala Enumeration Value that has a name, description for each object
 */
trait ValueWithDescription  {
    def description: String
    def name: String
}

abstract class EnumWithDescription  {
    type Value = enum.Value with ValueWithDescription

    private var _values: List[Value] = Nil
    def values = _values

    // possibly not a good idea using this directly
    val enum = new Enumeration {
        def Value(inName: String, inDescription: String): Value with ValueWithDescription = {
            new Val(nextId, inName) with ValueWithDescription {
                def description = inDescription
                def name = inName
            }
        }
    }

    def Value(name: String, description: String): Value = {
        val value = enum.Value(name, description)
        _values = _values ::: List(value)  // build in order
        value
    }

    def Value(name: String): Value = Value(name, name)

    def valueOf(name: String) = values find (_.name == name)

    def nameDescriptionList = values map(x => (x.name, x.description) )

}