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package com.datastax.util.io;

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

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * UserItem: Anders Hong
 * Date: 6/19/13
 * Time: 3:34 PM
 */
public class BigSAXParser extends DefaultHandler {

    public static Map> extractData(InputStream is,String[] keys){
        SAXParserFactory factory= SAXParserFactory.newInstance();
        try {
            SAXParser parser=factory.newSAXParser();
            BigSAXParser bp=new BigSAXParser(keys);
            parser.parse(is,bp);
            return bp.getData();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
        return null;
    }

    public static Map> extractData(String uri,String[] keys){
        SAXParserFactory factory= SAXParserFactory.newInstance();
        try {
            SAXParser parser=factory.newSAXParser();
            BigSAXParser bp=new BigSAXParser(keys);
            parser.parse(uri,bp);
            return bp.getData();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
        return null;
    }

    public static Map> extractData(File file,String[] keys){
        SAXParserFactory factory= SAXParserFactory.newInstance();
        try {
            SAXParser parser=factory.newSAXParser();
            BigSAXParser bp=new BigSAXParser(keys);
            parser.parse(file,bp);
            return bp.getData();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
        return null;
    }

    private String flag=null;
    private String[] keys;
    private Map> map=new HashMap>();
    public BigSAXParser(String[] keys){
        this.keys=keys;
        for(String key : keys){
            map.put(key,new ArrayList());
        }
    }

    public Map> getData(){
        return map;
    }

    private boolean isKey(String text){
        for(String key : keys){
            if(key.equals(text)) return true;
        }
        return false;
    }

    @Override
    public void startDocument() throws SAXException {
    }
    @Override
    public void endDocument() throws SAXException {
    }
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        String str=new String(ch,start,length);
        if(isKey(flag)){
            map.get(flag).add(str);
        }

        if(isKey(str)){
            flag=str;
        }else {
            flag=null;
        }
    }
    @Override
    public void startElement(String url, String LocalName, String qName, Attributes attr) throws SAXException {
    }
    @Override
    public void endElement(String url, String LocalName, String qName) throws SAXException {
    }
}