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Scala example source code file (LoggedNodeFactory.scala)

This example Scala source code file (LoggedNodeFactory.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

a, cache, cache, full, loggednodefactory, namespacebinding, node, nodefactory, none, none, seq, seq, string, string

The Scala LoggedNodeFactory.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala.xml
package factory

/** This class logs what the nodefactory is actually doing.
 *  If you want to see what happens during loading, use it like this:
{{{
object testLogged extends Application {
  val x = new scala.xml.parsing.NoBindingFactoryAdapter
        with scala.xml.factory.LoggedNodeFactory[scala.xml.Elem]
        with scala.util.logging.ConsoleLogger

  Console.println("Start")
  val doc = x.load(new java.net.URL("http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk/build.xml"))
  Console.println("End")
  Console.println(doc)
}
}}}
 *
 *  @author  Burak Emir
 *  @version 1.0
 */
trait LoggedNodeFactory[A <: Node] extends NodeFactory[A] with scala.util.logging.Logged {
  // configuration values
  val logNode      = true
  val logText      = false
  val logComment   = false
  val logProcInstr = false

  final val NONE  = 0
  final val CACHE = 1
  final val FULL  = 2
  /** 0 = no logging, 1 = cache hits, 2 = detail */
  val logCompressLevel  = 1
  
  // methods of NodeFactory

  /** logged version of makeNode method */
  override def makeNode(pre: String, label: String, attrSeq: MetaData,
                        scope: NamespaceBinding, children: Seq[Node]): A = {
    if (logNode)
      log("[makeNode for "+label+"]");

    val hash = Utility.hashCode(pre, label, attrSeq.##, scope.##, children)

    /*
    if(logCompressLevel >= FULL) {
      log("[hashcode total:"+hash);
      log(" elem name "+uname+" hash "+ ? ));
      log(" attrs     "+attrSeq+" hash "+attrSeq.hashCode());
      log(" children :"+children+" hash "+children.hashCode());
    }
    */
    if (!cache.get( hash ).isEmpty && (logCompressLevel >= CACHE))
      log("[cache hit !]");

    super.makeNode(pre, label, attrSeq, scope, children)
  }
  
  override def makeText(s: String) = {
    if (logText)
      log("[makeText:\""+s+"\"]");
    super.makeText(s)
  }

  override def makeComment(s: String): Seq[Comment] = {
    if (logComment)
      log("[makeComment:\""+s+"\"]");
    super.makeComment(s)
  }

  override def makeProcInstr(t: String, s: String): Seq[ProcInstr] = {
    if (logProcInstr)
      log("[makeProcInstr:\""+t+" "+ s+"\"]");
    super.makeProcInstr(t, s)
  }

}

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