/*
 *                    BioJava development code
 *
 * This code may be freely distributed and modified under the
 * terms of the GNU Lesser General Public Licence.  This should
 * be distributed with the code.  If you do not have a copy,
 * see:
 *
 *      http://www.gnu.org/copyleft/lesser.html
 *
 * Copyright for this code is held jointly by the individual
 * authors.  These should be listed in @author doc comments.
 *
 * For more information on the BioJava project and its aims,
 * or to join the biojava-l mailing list, visit the home page
 * at:
 *
 *      http://www.biojava.org/
 *
 * Created on 19.03.2004
 * @author Andreas Prlic
 *
 */
package org.biojava.dasobert.das;

import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.Attributes;

import java.util.ArrayList ;
import java.util.HashMap ;
import java.util.List;

/**
 * a class to parse the response of a DAS - Feature request
 * @author Andreas Prlic
 *
 */
public class DAS_Feature_Handler  extends DefaultHandler{
    
    /**
     * 
     */
    List features ;
    boolean first_flag ;
    HashMap feature ;
    String featurefield ;
    String characterdata ;
    String dasCommand ;
    
    int comeBackLater ;
    
    public DAS_Feature_Handler() {
        super();
        
        features= new ArrayList() ;
        first_flag = true ;
        featurefield = "" ;
        characterdata = "";
        dasCommand = "" ;
        comeBackLater = -1; 
    }
    
    public void setDASCommand(String cmd) { dasCommand = cmd ;}
    public String getDASCommand() { return dasCommand; }
    
    public List get_features() {
        return features ;
    }
    
    public int getComBackLater(){
        return comeBackLater;
    }
    
    void start_feature(String uri, String name, String qName, Attributes atts) {
        feature = new HashMap() ;
        String id 	= atts.getValue("id");
        feature.put("id",id);
        feature.put("dassource",dasCommand);
        characterdata = "";
    }
    
    void add_featuredata(String uri, String name, String qName) {
        //System.out.println("featurefield "+featurefield+ " data "+characterdata);
        // NOTE can have multiple lines ..
        
        String data = (String)feature.get(featurefield);
        if (data != null){
            characterdata = data + " " + characterdata;
        }
        
        feature.put(featurefield,characterdata);
        featurefield = "";
        characterdata = "";
    }
    
    private void addLink(String uri, String name, String qName, Attributes atts) {
        String href = atts.getValue("href");
        feature.put("LINK",href);
        characterdata="";
        featurefield = "LINK-TEXT";
                
    }
    
    public void startElement (String uri, String name, String qName, Attributes atts){
        //System.out.println("new element "+qName);
        
        if (qName.equals("FEATURE")) 
            start_feature(uri,  name,  qName,  atts);
        else if ( qName.equals("LINK"))
            addLink(uri,name,qName, atts);
        else if ( qName.equals("METHOD") || 
                qName.equals("TYPE") ||
                qName.equals("START") ||
                qName.equals("END") ||
                qName.equals("NOTE") ||                
                qName.equals("SCORE")
        ){
            characterdata ="";
            featurefield = qName ;
        }
        
    }
    
    public void startDocument() {
        //System.out.println("start document");
    }
    
    public void endDocument ()	{
        //System.out.println("adding feature " + feature);
        //features.add(feature);
        
    }
    public void endElement(String uri, String name, String qName) {
        //System.out.println("end "+name);
        if ( qName.equals("METHOD") || 
                qName.equals("TYPE") ||
                qName.equals("START") ||
                qName.equals("END") ||
                qName.equals("NOTE") || 
                qName.equals("LINK") || 
                qName.equals("SCORE")
        ) {
            add_featuredata(uri,name,qName);
        }
        else if ( qName.equals("FEATURE")) {
            //System.out.println("adding ffeature " + feature);
            features.add(feature);
        }
    }
    
    public void characters (char ch[], int start, int length){
        //System.out.println("characters");
        for (int i = start; i < start + length; i++) {
            
            characterdata += ch[i];
        }
        
    }
    
}