//rssParser.java
//------------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@anomic.de
//first published on http://www.anomic.de
//Frankfurt, Germany, 2005
//
//this file is contributed by Martin Thelian
//last major change: 16.05.2005
//
//This program 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 2 of the License, or
//(at your option) any later version.
//
//This program 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 this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
//Using this software in any meaning (reading, learning, copying, compiling,
//running) means that you agree that the Author(s) is (are) not responsible
//for cost, loss of data or any harm that may be caused directly or indirectly
//by usage of this softare or this documentation. The usage of this software
//is on your own risk. The installation and usage (starting/running) of this
//software may allow other people or application to access your computer and
//any attached devices and is highly dependent on the configuration of the
//software which must be done by the user of the software; the author(s) is
//(are) also not responsible for proper configuration and usage of the
//software, even if provoked by documentation provided together with
//the software.
//
//Any changes to this file according to the GPL as documented in the file
//gpl.txt aside this file in the shipment you received can be done to the
//lines that follows this copyright notice here, but changes must not be
//done inside the copyright notive above. A re-distribution must contain
//the intact and unchanged copyright notice.
//Contributions and changes to the program code must be marked as such.
package de.anomic.plasma.parser.rss;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Writer;
import java.util.Collection;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.TreeSet;
import de.anomic.htmlFilter.htmlFilterAbstractScraper;
import de.anomic.htmlFilter.htmlFilterContentScraper;
import de.anomic.htmlFilter.htmlFilterImageEntry;
import de.anomic.htmlFilter.htmlFilterWriter;
import de.anomic.net.URL;
import de.anomic.plasma.plasmaParserDocument;
import de.anomic.plasma.parser.AbstractParser;
import de.anomic.plasma.parser.Parser;
import de.anomic.plasma.parser.ParserException;
import de.anomic.server.serverByteBuffer;
import de.anomic.server.serverCharBuffer;
import de.anomic.server.serverFileUtils;
import de.nava.informa.core.ChannelIF;
import de.nava.informa.core.ImageIF;
import de.nava.informa.impl.basic.ChannelBuilder;
import de.nava.informa.impl.basic.Item;
import de.nava.informa.parsers.FeedParser;
public class rssParser extends AbstractParser implements Parser {
/**
* a list of mime types that are supported by this parser class
* @see #getSupportedMimeTypes()
*/
public static final Hashtable SUPPORTED_MIME_TYPES = new Hashtable();
static {
SUPPORTED_MIME_TYPES.put("text/rss","xml,rss,rdf");
SUPPORTED_MIME_TYPES.put("application/rdf+xml","xml,rss,rdf");
SUPPORTED_MIME_TYPES.put("application/rss+xml","xml,rss,rdf");
SUPPORTED_MIME_TYPES.put("application/atom+xml","xml,atom");
}
/**
* a list of library names that are needed by this parser
* @see Parser#getLibxDependences()
*/
private static final String[] LIBX_DEPENDENCIES = new String[] {
"informa-0.6.0.jar",
"commons-logging.jar",
"jdom.jar"
};
public rssParser() {
super(LIBX_DEPENDENCIES);
this.parserName = "Rich Site Summary/Atom Feed Parser";
}
public plasmaParserDocument parse(URL location, String mimeType, String charset, InputStream source) throws ParserException, InterruptedException {
try {
LinkedList feedSections = new LinkedList();
HashMap anchors = new HashMap();
TreeSet images = new TreeSet();
serverByteBuffer text = new serverByteBuffer();
// creating a channel-builder
ChannelBuilder builder = new ChannelBuilder();
// parsing the rss/atom feed
ChannelIF channel = FeedParser.parse(builder, source);
// getting the rss feed title and description
String feedTitle = channel.getTitle();
// getting the feed description
String feedDescription = channel.getDescription();
// getting the channel site url
//URL channelSiteURL = channel.getSite();
ImageIF channelImage = channel.getImage();
if (channelImage != null) {
images.add(new htmlFilterImageEntry(new URL(channelImage.getLocation().toExternalForm()), channelImage.getTitle(), -1, -1));
}
// loop through the feed items
Collection feedItemCollection = channel.getItems();
if (!feedItemCollection.isEmpty()) {
Iterator feedItemIterator = feedItemCollection.iterator();
while (feedItemIterator.hasNext()) {
// check for interruption
checkInterruption();
// getting the next item
Item item = (Item)feedItemIterator.next();
String itemTitle = item.getTitle();
URL itemURL = new URL(item.getLink().toExternalForm());
String itemDescr = item.getDescription();
feedSections.add(itemTitle);
anchors.put(itemURL.toString(),itemTitle);
if ((text.length() != 0) && (text.byteAt(text.length() - 1) != 32)) text.append((byte) 32);
text.append(new serverCharBuffer(htmlFilterAbstractScraper.stripAll(new serverCharBuffer(itemDescr.toCharArray()))).trim().toString()).append(' ');
String itemContent = item.getElementValue("content");
if ((itemContent != null) && (itemContent.length() > 0)) {
htmlFilterContentScraper scraper = new htmlFilterContentScraper(itemURL);
Writer writer = new htmlFilterWriter(null, null, scraper, null, false);
serverFileUtils.copy(new ByteArrayInputStream(itemContent.getBytes("UTF-8")), writer, "UTF-8");
String itemHeadline = scraper.getTitle();
if ((itemHeadline != null) && (itemHeadline.length() > 0)) {
feedSections.add(itemHeadline);
}
Map itemLinks = scraper.getAnchors();
if ((itemLinks != null) && (itemLinks.size() > 0)) {
anchors.putAll(itemLinks);
}
TreeSet itemImages = scraper.getImages();
if ((itemImages != null) && (itemImages.size() > 0)) {
images.addAll(itemImages);
}
byte[] extractedText = scraper.getText();
if ((extractedText != null) && (extractedText.length > 0)) {
if ((text.length() != 0) && (text.byteAt(text.length() - 1) != 32)) text.append((byte) 32);
text.append(scraper.getText());
}
}
}
}
plasmaParserDocument theDoc = new plasmaParserDocument(
location,
mimeType,
"UTF-8",
null,
null,
feedTitle,
(String[]) feedSections.toArray(new String[feedSections.size()]),
feedDescription,
text.getBytes(),
anchors,
images);
return theDoc;
} catch (Exception e) {
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof ParserException) throw (ParserException) e;
throw new ParserException("Unexpected error while parsing rss file." + e.getMessage(),location);
}
}
public Hashtable getSupportedMimeTypes() {
return SUPPORTED_MIME_TYPES;
}
public void reset() {
// Nothing todo here at the moment
super.reset();
}
}