DetailedViewJob.java

/**
    Copyright 2012 Fahad Al-Khameesi, Madeleine Appert, Niklas Logren, Arild Matsson and Jonathan Orr�.
    
    This file is part of Bibbla.

    Bibbla is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Bibbla is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Bibbla.  If not, see <http://www.gnu.org/licenses/>.    
 **/

package dat255.grupp06.bibbla.backend.tasks;

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

import org.jsoup.Connection.Method;
import org.jsoup.Connection.Response;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import dat255.grupp06.bibbla.backend.Backend;
import dat255.grupp06.bibbla.model.Book;
import dat255.grupp06.bibbla.model.PhysicalBook;
import dat255.grupp06.bibbla.utils.Error;
import dat255.grupp06.bibbla.utils.Message;

/**
 * Fetches the detailed view of a book, and
 * saves the additional information in a new Book.
 * 
 * @author Fahad Al-Khameesi
 */
public class DetailedViewJob extends Job {
	
	private Book originalBook, newBook;
	private Message message = new Message();
	
	public DetailedViewJob(Book book){
		this.originalBook = book;
		this.newBook = (Book)originalBook.clone();
	}
	
	/**
	 * Fetches the detailed view of a book.
	 * 
	 * @returns a new Book, containing the additional information present in its detailed view.
	 */
	public Message run(){
		
		try {
			System.out.print("\n****** DetailedViewJob\n");
			System.out.print("* step 1: fetch book details... ");
			Response response = connectAndRetry();
			System.out.print("* step 2: parse book details... ");
			parseBookDetails(response);
			System.out.print("succeeded! *\n*");
			System.out.print("****** DetailedViewJob done \n");
			
		} catch (Exception e) {
			message.error = (message.error!=null) ? message.error : Error.DETAILED_VIEW_FAILED;
		}
		
		return message;
	}
	
	@Override
	/**
	 * Fetches the details of the supplied book.
	 * 
	 * @throws Exception if HTTP connection failed.
	 */
	protected Response connect() throws Exception {
		// Performs connection using Jsoup.
	    Response r = Jsoup.connect(originalBook.getUrl())
			    .method(Method.GET)
			    .timeout(Backend.CONNECTION_TIMEOUT)
			    .execute();
	    return r;
	}
	
	/**
	 * Parses the HTML document fetched by fetchBookDetails().
	 * 
	 * @throws Exception if parsing fails.
	 */
	private void parseBookDetails(Response response) throws Exception{

		// Prepare HTML for parsing.
		Document html = response.parse();

	    List<PhysicalBook> physicalBooks = new ArrayList<PhysicalBook>();
	    Elements tableRows = html.select("table.bibItems").select("tr.bibItemsEntry");
	    
	    // Create all our PhysicalBooks.
	    for (Element row : tableRows) {
	    	Elements columns = row.getElementsByTag("td"); 
	    	String library = columns.get(0).text();
	    	String shelf = columns.get(1).text();
	    	String status = columns.get(2).text();
	    	String message = columns.get(3).text();
	    	PhysicalBook physicalBook = new PhysicalBook(library, shelf, status, message);
	    	physicalBooks.add(physicalBook);
	    }

	    // Select all rows containing detailed information.
	    Elements rows = html.select("div#orders").select("table.bibDetail").select("tr");
	    String description = "", notes = "", isbn = "";

	    // Loop through all rows.
	    for(int i=1;i<rows.size();i++) {
	    	
	    	// If we find a physical description,
	    	if(rows.get(i).select("td.bibInfoLabel").text().equals((String) "Fysisk beskrivning")){
	    		// Save the text present on row #1,
	    		description += (rows.get(i)).select("td.bibInfoData").text();
				int n = i+1;
				// And if there are rows without labels following it,
				// they are also part of the description. 
				while((rows.get(n).select("td.bibInfoLabel").size() == 0)){
					description += (rows.get(n)).select("td.bibInfoData").text();
					n++;
				}
	    	}
	    	
	    	// If we find a note,
	       	if(rows.get(i).select("td.bibInfoLabel").text().equals((String) "Anm�rkning")) {
	       		// Save the text on row #1
	    		notes += (rows.get(i)).select("td.bibInfoData").text();
				int n = i+1;
				// And save text of possible following rows that has no label.
				while((rows.get(n).select("td.bibInfoLabel").size() == 0)) {
					notes += (rows.get(n)).select("td.bibInfoData").text();
					n++;
				}
	    	}
	       	
	       	// If we find an ISBN, save it.
	       	if(rows.get(i).select("td.bibInfoLabel").text().equals((String) "ISBN")){
	    		isbn = (rows.get(i)).select("td.bibInfoData").text();
	    	}
	    }
	    
		Elements table = html.select("table.bibDetail").first().select("tr");
		for(int i=0;i<table.size();i++){
			if( table.get(i).select("td.bibInfoLabel").text().equals((String) "Upphov")){
				newBook.setAuthor(table.get(i).select("td.bibInfoData").text());
				
			}
			if( table.get(i).select("td.bibInfoLabel").text().equals((String) "Titel")){
				String[] temp =(table.get(i).select("td.bibInfoData").text().split("/"));
				newBook.setName(temp[0]);
			}
			
			if( table.get(i).select("td.bibInfoLabel").text().equals((String) "Utgivning")){
				
				newBook.setPublisher(table.get(i).select("td.bibInfoData").text());
			}
		}
	    
	    // Update newBook with this information.
	    newBook.setPhysicalBooks(physicalBooks);
	    newBook.setIsbn(isbn);
	    newBook.setNotes(notes);
	    newBook.setPhysicalDescription(description);
	    
	    message.obj = newBook;
	}

}