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Scala example source code file (IndexModelFactory.scala)

This example Scala source code file (IndexModelFactory.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 - Scala tags/keywords

abstracttype, aliastype, aliastype, doctemplateentity, doctemplateentity, index, index, indexmodelfactory, map, memberentity, memberentity, nontemplatememberentity, string, universe

The Scala IndexModelFactory.scala source code

/* NSC -- new Scala compiler
 * Copyright 2007-2011 LAMP/EPFL
 * @author  Pedro Furlanetto
 */

package scala.tools.nsc
package doc
package model

import scala.collection._

object IndexModelFactory {
  
  def makeIndex(universe: Universe): Index = new Index {

    lazy val firstLetterIndex: Map[Char, SymbolMap] = {

      val result = new mutable.HashMap[Char,SymbolMap] {

        /* Owner template ordering */
        implicit def orderingSet = math.Ordering.String.on { x: MemberEntity => x.name.toLowerCase }
        /* symbol name ordering */
        implicit def orderingMap = math.Ordering.String.on { x: String => x.toLowerCase }

        def addMember(d: MemberEntity) = {
          val firstLetter = {
            val ch = d.name.head.toLower
            if(ch.isLetterOrDigit) ch else '#'
          }
          val letter = this.get(firstLetter).getOrElse {
            immutable.SortedMap[String, SortedSet[MemberEntity]]()
          }
          val members = letter.get(d.name).getOrElse {
            SortedSet.empty[MemberEntity](Ordering.by { _.toString })
          } + d
          this(firstLetter) = letter + (d.name -> members)
        }

      }

      //@scala.annotation.tailrec // TODO
      def gather(owner: DocTemplateEntity): Unit =
        for(m <- owner.members if m.inDefinitionTemplates.isEmpty || m.inDefinitionTemplates.head == owner)
          m match {
            case tpl: DocTemplateEntity =>
              result.addMember(tpl)
              gather(tpl)
            case alias: AliasType =>
              result.addMember(alias)
            case absType: AbstractType =>
              result.addMember(absType)
            case non: NonTemplateMemberEntity if !non.isConstructor =>
              result.addMember(non)
            case x @ _ =>
          }

      gather(universe.rootPackage)

      result.toMap

    }

  }
  
}

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