XMLParser.java

/** 
   Copyright 2013 Technische Universitat Wien (TUW), Distributed SystemsGroup E184.               
   
   This work was partially supported by the European Commission in terms of the CELAR FP7 project (FP7-ICT-2011-8 #317790).
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

/**
 *  Author : Georgiana Copil - e.copil@dsg.tuwien.ac.at
 */

package at.ac.tuwien.dsg.sybl.syblProcessingUnit.languageDescription;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedList;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import at.ac.tuwien.dsg.sybl.syblProcessingUnit.utils.Configuration;
import at.ac.tuwien.dsg.sybl.syblProcessingUnit.utils.SYBLDirectivesEnforcementLogger;





public class XMLParser
{
	private Document doc = null;
	
	public XMLParser()
	{
		try
		{
			InputStream is = this.getClass().getClassLoader().getResourceAsStream(Configuration.getLanguageDescription());
			doc = parserXML(is);
			
			//visit(doc, 0);
		}catch(IllegalStateException e){
                    SYBLDirectivesEnforcementLogger.logger.error("XML parser stopped");
                }
		catch(Exception error)
		{
			SYBLDirectivesEnforcementLogger.logger.error("XML Parser at constructor "+ error.toString());
		}
	}
	
	public void visit(Node node, int level)
	{
            try{
		NodeList nl = node.getChildNodes();
		
		for(int i=0, cnt=nl.getLength(); i<cnt; i++)
		{
			//System.out.println("["+nl.item(i)+"]");
			
			visit(nl.item(i), level+1);

		}
            }catch(IllegalStateException e){
                    SYBLDirectivesEnforcementLogger.logger.error("XML parser stopped");
                }
	}
	
	public Node searchConcept(String conceptName){
		//split concept name into more concepts to be able to search for it
            try{
		String[] conc = conceptName.split("\\.");
		LinkedList<String> concepts = new LinkedList<String>();
		for (String s:conc){
			concepts.addLast(s);
		}
		LinkedList<Node> nodes = new LinkedList<Node>();
		nodes.addFirst(doc);
		return searchComplexConcept(concepts,nodes);
            }catch(IllegalStateException e){
                    SYBLDirectivesEnforcementLogger.logger.error("XML parser stopped");
                }
            return null;
	}
	
	private Node searchComplexConcept(LinkedList<String> conceptNames,LinkedList<Node> toVisit){
            try{
		if (!toVisit.isEmpty()){
		Node currentNode= toVisit.getFirst();	
		toVisit.removeFirst();
                if (currentNode!=null){
		Node n = currentNode.getFirstChild();
		while (n!=null){
			toVisit.addFirst(n);
			n=n.getNextSibling();
		}
		
		if (currentNode.getNodeName().equalsIgnoreCase(conceptNames.getFirst()))
			conceptNames.removeFirst();
		if (conceptNames.isEmpty()) return currentNode;
		return searchComplexConcept(conceptNames,toVisit);
		}
                }
            }catch(IllegalStateException e){
                    SYBLDirectivesEnforcementLogger.logger.error("XML parser stopped");
                }
		return null;
		
	}
	
	private Node searchConcept(Node root,String conceptName){
            try{
		LinkedList<Node> queue = new LinkedList<Node>();
		queue.addFirst(root);
		while (queue.size()>0){
		//System.out.println(queue.getFirst().getNodeName());
	    Node n =queue.getFirst().getFirstChild();
	    queue.removeFirst();
		while (n!=null){ 
			 queue.addLast(n);
			if (n.getNodeName().equalsIgnoreCase(conceptName)) return n;
			n = n.getNextSibling();
		}
		
		}}catch(IllegalStateException e){
                    SYBLDirectivesEnforcementLogger.logger.error("XML parser stopped");
                }
		return null;
		
	}
	
	public Document getDocument(){
		return doc;
	}
	public Document parserXML(InputStream inputStream) throws SAXException, IOException, ParserConfigurationException
	{
		return DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputStream);
	}
}