ArchiveBolt.java

/*
    The MIT License (MIT)

    Copyright (c) 2016 sinfonier-project

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

package com.sinfonier.bolts;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class ArchiveBolt extends BaseSinfonierBolt {

    // Class variables
	public String BUSQUEDA;

    // Must implement constructor. Do not touch
    public ArchiveBolt(String path) {
        super(path);
    }

    @Override
    public void userprepare() {
        // Initialize your DB Connections or non-serializable classes.
        // This method will be executed once.
    	this.BUSQUEDA = getParam("busqueda");
    }

    @Override
    public void userexecute() {

        // TO-DO: Write code here. This method will be called every ingoing tuple

    	String url = "https://archive.org/search.php?query="+this.getField(this.BUSQUEDA).toString();
		
		Document doc;
        try {

            // need http protocol
            doc = Jsoup.connect(url).get();

            // get page title
            String title = doc.title();

            // get all links
            Elements loginform = doc.getElementsByClass("item-ia");
          
            int i = 1;
            for (Element link : loginform) {
               System.out.println();
               if(!link.getElementsByClass("ttl").text().equals("null"))
              	  this.addField("busqueda"+i,link.getElementsByClass("ttl").text());
               else
            	  this.addField("busqueda"+i, "0");

                i++;
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
		      
        
        this.emit();
    }

    @Override
    public void usercleanup() {
        // Close connections, clean resources
    }

}