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226 lines
8.8 KiB
226 lines
8.8 KiB
//rssParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@yacy.net
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2005
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//
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//this file is contributed by Martin Thelian
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.document.parser;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
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import java.io.Writer;
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import java.net.MalformedURLException;
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import java.nio.charset.Charset;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedList;
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import java.util.Map;
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import java.util.Set;
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import net.yacy.cora.document.Hit;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.cora.document.RSSFeed;
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import net.yacy.cora.document.RSSReader;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Idiom;
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import net.yacy.document.ParserException;
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import net.yacy.document.parser.html.AbstractScraper;
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import net.yacy.document.parser.html.ContentScraper;
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import net.yacy.document.parser.html.ImageEntry;
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import net.yacy.document.parser.html.TransformerWriter;
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import net.yacy.kelondro.io.CharBuffer;
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import net.yacy.kelondro.util.ByteBuffer;
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import net.yacy.kelondro.util.FileUtils;
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public class rssParser extends AbstractParser implements Idiom {
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/**
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* a list of mime types that are supported by this parser class
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* @see #getSupportedMimeTypes()
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*/
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public static final Set<String> SUPPORTED_MIME_TYPES = new HashSet<String>();
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public static final Set<String> SUPPORTED_EXTENSIONS = new HashSet<String>();
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static {
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SUPPORTED_EXTENSIONS.add("rss");
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SUPPORTED_EXTENSIONS.add("xml");
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SUPPORTED_MIME_TYPES.add("XML");
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SUPPORTED_MIME_TYPES.add("text/rss");
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SUPPORTED_MIME_TYPES.add("application/rss+xml");
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SUPPORTED_MIME_TYPES.add("application/atom+xml");
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}
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public rssParser() {
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super("Rich Site Summary/Atom Feed Parser");
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}
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public Document parse(final MultiProtocolURI location, final String mimeType, final String charset, final InputStream source) throws ParserException, InterruptedException {
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final LinkedList<String> feedSections = new LinkedList<String>();
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final HashMap<MultiProtocolURI, String> anchors = new HashMap<MultiProtocolURI, String>();
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final HashMap<MultiProtocolURI, ImageEntry> images = new HashMap<MultiProtocolURI, ImageEntry>();
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final ByteBuffer text = new ByteBuffer();
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final CharBuffer authors = new CharBuffer();
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RSSFeed feed = null;
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try {
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feed = new RSSReader(source).getFeed();
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} catch (IOException e) {
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throw new ParserException("reading feed failed: " + e.getMessage(), location);
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}
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if (feed == null) throw new ParserException("no feed in document", location);
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String feedTitle = "";
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String feedDescription = "";
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String feedPublisher = "";
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String[] feedSubject = {""};
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if (feed.getChannel() != null) {//throw new ParserException("no channel in document",location);
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// get the rss feed title and description
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feedTitle = feed.getChannel().getTitle();
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// get feed creator
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final String feedCreator = feed.getChannel().getAuthor();
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if (feedCreator != null && feedCreator.length() > 0) authors.append(",").append(feedCreator);
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// get the feed description
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feedDescription = feed.getChannel().getDescription();
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// the feed publisher
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feedPublisher = feed.getChannel().getCopyright();
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// the feed subject
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feedSubject = feed.getChannel().getSubject();
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}
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if (feed.getImage() != null) {
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try {
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MultiProtocolURI imgURL = new MultiProtocolURI(feed.getImage());
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images.put(imgURL, new ImageEntry(imgURL, feedTitle, -1, -1, -1));
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} catch (MalformedURLException e) {}
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}
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// loop through the feed items
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for (final Hit item: feed) {
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// check for interruption
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checkInterruption();
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final String itemTitle = item.getTitle();
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MultiProtocolURI itemURL = null;
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try {
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itemURL = new MultiProtocolURI(item.getLink());
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} catch (MalformedURLException e) {
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continue;
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}
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final String itemDescr = item.getDescription();
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final String itemCreator = item.getAuthor();
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if (itemCreator != null && itemCreator.length() > 0) authors.append(",").append(itemCreator);
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feedSections.add(itemTitle);
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anchors.put(itemURL, itemTitle);
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if ((text.length() != 0) && (text.byteAt(text.length() - 1) != 32)) text.append((byte) 32);
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text.append(AbstractScraper.stripAll(itemDescr).trim()).append(' ');
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final String itemContent = item.getDescription();
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if ((itemContent != null) && (itemContent.length() > 0)) {
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final ContentScraper scraper = new ContentScraper(itemURL);
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final Writer writer = new TransformerWriter(null, null, scraper, null, false);
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try {
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FileUtils.copy(new ByteArrayInputStream(itemContent.getBytes("UTF-8")), writer, Charset.forName("UTF-8"));
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} catch (UnsupportedEncodingException e) {
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continue;
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} catch (IOException e) {
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continue;
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}
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final String itemHeadline = scraper.getTitle();
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if (itemHeadline != null && itemHeadline.length() > 0) {
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feedSections.add(itemHeadline);
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}
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final Map<MultiProtocolURI, String> itemLinks = scraper.getAnchors();
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if (itemLinks != null && !itemLinks.isEmpty()) {
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anchors.putAll(itemLinks);
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}
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final HashMap<MultiProtocolURI, ImageEntry> itemImages = scraper.getImages();
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if (itemImages != null && !itemImages.isEmpty()) {
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ContentScraper.addAllImages(images, itemImages);
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}
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final byte[] extractedText = scraper.getText();
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if ((extractedText != null) && (extractedText.length > 0)) {
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if ((text.length() != 0) && (text.byteAt(text.length() - 1) != 32)) text.append((byte) 32);
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text.append(scraper.getText());
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}
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}
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}
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final Document theDoc = new Document(
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location,
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mimeType,
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"UTF-8",
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null,
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feedSubject,
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feedTitle,
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(authors.length() > 0)?authors.toString(1,authors.length()):"",
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feedPublisher,
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feedSections.toArray(new String[feedSections.size()]),
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feedDescription,
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text.getBytes(),
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anchors,
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images,
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false);
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// close streams
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try {
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text.close();
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authors.close();
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} catch (IOException e) {
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}
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return theDoc;
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}
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public Set<String> supportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public Set<String> supportedExtensions() {
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return SUPPORTED_EXTENSIONS;
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}
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@Override
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public void reset() {
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// Nothing todo here at the moment
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super.reset();
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}
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}
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