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Thread: How to Parse MusicXML file using DOM parser?

  1. #1
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    Mar 2012
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    Default How to Parse MusicXML file using DOM parser?

    Hi everyone, I am trying to parse musicXML file using DOM. However I am getting some error which I cant figure out why. Can someone help me to find this issue I am having and also can someone check if my coding is correct in terms or XML tree structure. The following code I have written sofar. I have attached the xml file that I am trying to work on.

    package de.uos.fmt.musitech.score.musicxml;
     
    import java.io.IOException;
    import java.net.URL;
     
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    import javax.xml.parsers.ParserConfigurationException;
     
    import org.w3c.dom.Document;
    import org.w3c.dom.Element;
    import org.w3c.dom.Node;
    import org.w3c.dom.NodeList;
    import org.xml.sax.SAXException;
     
    import de.uos.fmt.musitech.data.score.NotationStaff;
    import de.uos.fmt.musitech.data.score.NotationSystem;
    import de.uos.fmt.musitech.data.score.NotationVoice;
    import de.uos.fmt.musitech.data.score.ScoreNote;
    import de.uos.fmt.musitech.data.structure.Context;
    import de.uos.fmt.musitech.data.structure.Note;
    import de.uos.fmt.musitech.data.structure.Piece;
    import de.uos.fmt.musitech.data.structure.linear.Part;
    import de.uos.fmt.musitech.score.mpegsmr.Attributes;
    import de.uos.fmt.musitech.utility.math.Rational;
     
    public class DomParser<Partwise> {
    	private Piece piece;
     
    	public DomParser(URL url){
    		parseXmlFile(url);	
    	}		
     
    	private void parseXmlFile(URL url){
    		//get the factory	
    		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    		try {
    			//Using factory get an instance of document builder
    			DocumentBuilder db = dbf.newDocumentBuilder();
    			//parse using builder to get DOM representation of the XML file
    			Document dom = db.parse(url.openStream());
    			//Document dom = db.parse("music.xml");
    			piece = parseDocument(dom);
    		}catch(ParserConfigurationException pce) {
    			pce.printStackTrace();
    		}catch(SAXException se) {
    			se.printStackTrace();
    		}catch(IOException ioe) {
    			ioe.printStackTrace();
    		}		
    	}
    	private Piece parseDocument(Document dom){
    		//get the root element
    		Element docEle =  dom.getDocumentElement();
    		// create Musitech piece
    		Piece piece = new Piece();
     
    		// TODO distinction between partwise and measurewise/timewise (?)	
    		//partwise: get a nodelist of elements = parts
    		NodeList nl = docEle.getChildNodes();
    		if(nl != null && nl.getLength() > 0) {
    			for(int i = 0 ; i < nl.getLength();i++) {
    				Node node = nl.item(i);
    				if(node instanceof Element){
    					Element el = (Element)node;					
    					// switch  parts-list vs parts
    					if( el.getNodeName().equals("part")){
    						//create Musitech staff & voice
    						NotationStaff staff = new NotationStaff();
    						NotationVoice voice = new NotationVoice();
    						// go through notes in part
    						 NodeList cn = el.getChildNodes();
    						 for (int j = 0; j < cn.getLength(); j++) {
    							 Node n1 = cn.item(j);
    							 n1.getFirstChild();
    							 n1.getNextSibling();
    							 n1.getLastChild();
    							 staff.add(voice);
    //-------------------------------------------------------------------------
    							 if( el.getNodeName().equals("measure")){						
    								 NodeList cn1 = el.getChildNodes();			
    								 for (int k = 0; k < cn1.getLength(); k++) {
    									 Node n2 = cn1.item(k);	
    									 n2.getFirstChild();
    									 n2.getNextSibling();
    									 n2.getLastChild();
    									 //System.out.println(cn1);
     
    									 //attributes within measure
    									 if(el.getNodeName().equals("attributes")){
    										NodeList cn2 = el.getChildNodes();									
    										for (int s = 0; s <cn2.getLength(); s++){
    											Node n3 = cn2.item(s);
    											n3.getFirstChild();
    											n3.getNextSibling();
    											n3.getLastChild();
    											//if(n3.hasChildNodes()){
    												//Node n3 = getNote()
    											//}
    											//division within attributes
    											if(el.getNodeName().equals("division")){
    												el.getNodeValue();
    											}
    											//key within attributes
    											if(el.getNodeName().equals("key")){
    												NodeList cn3 = el.getChildNodes();
    												for (int m = 0; m <cn3.getLength(); m++){
    													Node n4 = cn3.item(m);
    													n4.getFirstChild();
    													if(n4.hasChildNodes()){
    														n4.getChildNodes();
    														n4.getNodeValue();
    													}
    													//if(el.getNodeName().equals("fifths")){
    														//Node n5 = n5.getNodeValue();
    													//}	
    												}
    											}				
    										}
    										//time within attributes
    										if(el.getNodeName().equals("time")){
    										 NodeList cn4 = el.getChildNodes();
    										 for (int n =0; n<cn4.getLength(); n++){
    											 Node n5 = cn4.item(n);
    											 if(n5.hasChildNodes()){
    												 n5.getChildNodes();
    												 n5.getNextSibling().getNodeValue(); 
    											 }
     
    										 }
    										}
    										//clef within attributes
    										if(el.getNodeName().equals("clef")){
    											 NodeList cn5 = el.getChildNodes();
    											 for (int o =0; o <cn5.getLength(); o++){
    												 Node n6 = cn5.item(o);
    												 if(n6.hasChildNodes()){
    													 n6.getChildNodes();
    													 n6.getNextSibling().getNodeValue();	
    												 }
    									 }											 
    						 		}
    										//note within measure 
    										if(el.getNodeName().equals("note")){
    											NodeList cn6 = el.getChildNodes();
    											for(int p = 0; p <cn6.getLength(); p++){
    												Node n7 = cn6.item(p);
    												n7.getFirstChild().getNextSibling().getNodeValue();
    												n7.getLastChild().getNextSibling().getNodeValue();
    												//pitch within note
    												if(el.getNodeName().equals("pitch")){
    													NodeList cn7 = el.getChildNodes();
    													for(int q =0; q <cn7.getLength(); q++){
    														Node n8 = cn6.item(q);
    														if(el.getNodeName().equals("step")){
    															el.getNodeValue();
    														}
    														if(el.getNodeName().equals("octave")){
    															el.getNodeValue();
    														}
    														n8.getFirstChild().getNextSibling().getNodeValue();												
    													}
    												}
    												if(el.getNodeName().equals("duration")){
    													el.getNodeValue();
    												}
    												if(el.getNodeName().equals("type")){
    													el.getNodeValue();
    												}
    											}
    										}
    									 }
    								 }
    							 }
     
    					}					
    				}
    			}
    		}
    	}
    	return piece;
    }
    	public Piece getPiece(){
    		return piece;
    	}
     
    	public Note getNote(Element el) {
    		// TODO Auto-generated method stub
    		ScoreNote snote = new ScoreNote();
    		//Note duration = getValue(el, "Duration");
    		//Note = type = getValue(el, "Type");
    		//getValue(el,"Duration");
    		//getValue(el,"Step");
    		snote.setDiatonic('C');
    		snote.setAlteration((byte)1);
    		snote.setMetricDuration(new Rational(1,4));
    		//snote.setOctave(0);
     
    		//Note  = (Note) ((DocumentBuilderFactory) el).getAttribute("note");		
    		//Create a new song with the value read from the xml nodes
    		//music = new Music (pitch,durution,time,key);
    		Note note = new Note(snote, null);
    		return note;
    	}
     
    	public Attributes getAttributes(Element el, Attributes tagName) {
    		Attributes attributes = null;
    		NodeList nl = (NodeList)el.appendChild(el);
    		if(nl != null && nl.getLength() > 0) {
    			Element e = (Element)nl.item(0);
    			//attributes = el.getNodeValue();
    		}
     
    		return attributes;
    	}
    	/**
    	 * Calls getTextValue and returns a int value
    	 */
    	public int getIntValue(Element ele, String tagName) {
    		//in production application you would catch the exception
    		return 0;
    	}	
    }
    Attached Files Attached Files

  2. The Following User Says Thank You to htechpro For This Useful Post:

    pierre.castellotti (January 28th, 2014)


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