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/*
* Copyright (c) 2013, Ringo Wathelet
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* - Neither the name of "scalaxal" nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.scalaxal.io
import com.scalaxal.xAL._
import org.xml.sax.InputSource
import scala.xml.XML._
import scala.xml.{NodeSeq, XML}
import java.io.{ File, FileDescriptor }
import scala.xml.Source._
import scala.language.postfixOps
/**
* @author Ringo Wathelet
* Date: 01/02/13
* Version: 1
*/
/**
* the extraction/creation of a xAL root element object from an xml node sequence
* Specifically getting a xAL root object from ... nodeSeq
*/
trait XalExtractor {
def makeXAL(nodeSeq: NodeSeq): Option[XAL]
}
/**
* Reads a xAL root element (XAL) from various file, string and NodeSeq input sources
*
* @param xalExtractor the xALExtractor object used to extract xAL from xml, default xALFromXml
* @param parser the SAX XML parser, default scala.xml.XML.parser
* @see xALFromXml
*/
class XalFileReader(xalExtractor: Option[XalExtractor] = Some(XalFromXml),
parser: scala.xml.SAXParser = scala.xml.XML.parser) {
/**
* get a xAL root element from the input source
*
* @param source xAL input source, such as a file, a file name, a file descriptor
* @return a xAL root element option
*/
def loadXal(source: InputSource): Option[XAL] = Some(loadXML(source, parser)) match {
case Some(nodeSeq) => getXal(nodeSeq)
case _ => None
}
/**
* get a sequence of Xal root element options from the input kmz file
* @param file the input kmz file
* @return a sequence of Xal root element options
*/
def getXalFromZipFile(file: File): Seq[Option[XAL]] = {
import scala.collection.JavaConversions._
if (!file.getName.toLowerCase.endsWith(".zip")) Seq.empty
else {
new java.util.zip.ZipFile(file).entries.
filter(_.getName.toLowerCase.endsWith(".xml")).
collect { case xmlFile => getXalFromFile(xmlFile.getName) } toSeq
}
}
/**
* get a Xal root element from the input file
* @param file the input xml file
* @return a Xal root element option
*/
def getXalFromFile(file: File): Option[XAL] = loadXal(fromFile(file))
/**
* get a Xal root element from the input file descriptor
* @param fd the input xml file descriptor
* @return a Xal root element option
*/
def getXalFromFile(fd: FileDescriptor): Option[XAL] = loadXal(fromFile(fd))
/**
* get a Xal root element from the input file name
* @param name the input file name
* @return a Xal root element option
*/
def getXalFromFile(name: String): Option[XAL] = loadXal(fromFile(name))
/**
* get a Xal root element from its input string representation
* @param xmlString the input xml string
* @return a Xal root element option
*/
def getXalFromString(xmlString: String): Option[XAL] = getXal(XML.loadString(xmlString))
/**
* get a Xal root element from its kml NodeSeq
* @param nodeSeq the input xml node sequence
* @return a Xal root element option
*/
def getXalFromNodeSeq(nodeSeq: scala.xml.NodeSeq): Option[XAL] = getXal(nodeSeq)
/**
* creates a Xal root element from the Node Sequence
* @param nodeSeq the xml node sequence
* @return a Xal root element option
*/
private def getXal(nodeSeq: scala.xml.NodeSeq): Option[XAL] = xalExtractor match {
case Some(extractor) => extractor.makeXAL(nodeSeq)
case _ => None
}
}
