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Scala example source code file (XMLLoader.scala)

This example Scala source code file (XMLLoader.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

file, filedescriptor, inputsource, inputsource, inputstream, io, net, network, node, parser, reader, saxparser, saxparser, string, string, t, t, topscope, xml

The Scala XMLLoader.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */


package scala.xml
package factory

import javax.xml.parsers.SAXParserFactory
import parsing.{ FactoryAdapter, NoBindingFactoryAdapter }
import java.io.{ InputStream, Reader, StringReader, File, FileDescriptor, FileInputStream }
import java.net.URL

/** Presents collection of XML loading methods which use the parser
 *  created by "def parser".
 */ 
trait XMLLoader[T <: Node]
{
  import scala.xml.Source._
  def adapter: FactoryAdapter = new NoBindingFactoryAdapter()
  
  /* Override this to use a different SAXParser. */
  def parser: SAXParser = {
    val f = SAXParserFactory.newInstance()
    f.setNamespaceAware(false)
    f.newSAXParser()
  }
  
  /** Loads XML from the given InputSource, using the supplied parser.
   *  The methods available in scala.xml.XML use the XML parser in the JDK.
   */
  def loadXML(source: InputSource, parser: SAXParser): T = {
    val newAdapter = adapter
    
    newAdapter.scopeStack push TopScope
    parser.parse(source, newAdapter)
    newAdapter.scopeStack.pop
    
    newAdapter.rootElem.asInstanceOf[T]
  }

  /** Loads XML from the given file, file descriptor, or filename. */
  def loadFile(file: File): T          = loadXML(fromFile(file), parser)
  def loadFile(fd: FileDescriptor): T  = loadXML(fromFile(fd), parser)
  def loadFile(name: String): T        = loadXML(fromFile(name), parser)
  
  /** loads XML from given InputStream, Reader, sysID, InputSource, or URL. */
  def load(is: InputStream): T         = loadXML(fromInputStream(is), parser)
  def load(reader: Reader): T          = loadXML(fromReader(reader), parser)
  def load(sysID: String): T           = loadXML(fromSysId(sysID), parser)
  def load(source: InputSource): T     = loadXML(source, parser)
  def load(url: URL): T                = loadXML(fromInputStream(url.openStream()), parser)

  /** Loads XML from the given String. */
  def loadString(string: String): T    = loadXML(fromString(string), parser)
}

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