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SOFTWARE LICENSE ---------------- Copyright (C) 2012, 2013, 2014 Younghyung Cho. <yhcting77@gmail.com> All rights reserved. This file is part of FeedHive This program is licensed under the FreeBSD l...
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/****************************************************************************** * Copyright (C) 2012, 2013, 2014//from ww w.j a v a 2 s . c om * Younghyung Cho. <yhcting77@gmail.com> * All rights reserved. * * This file is part of FeedHive * * This program is licensed under the FreeBSD license * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the FreeBSD Project. *****************************************************************************/ package free.yhc.feeder.model; import java.util.LinkedList; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; public class RSSParser extends FeedParser implements UnexpectedExceptionHandler.TrackedModule { private static final boolean DBG = false; private static final Utils.Logger P = new Utils.Logger(RSSParser.class); // parsing priority of namespace supported (larger number has priority) private static final short PRI_ITUNES = 2; private static final short PRI_DEFAULT = 1; // RSS default private static final short PRI_DC = 0; // ======================================== // To Support 'itunes' Namespace // ======================================== private class NSItunesParser extends NSParser { NSItunesParser() { super(PRI_ITUNES); } @Override boolean parseChannel(ChannelValues cv, Node n) throws FeederException { boolean ret = true; if (n.getNodeName().equalsIgnoreCase("itunes:summary")) setValue(cv.description, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("itunes:image")) { NamedNodeMap nnm = n.getAttributes(); Node img = nnm.getNamedItem("href"); if (null != img) setValue(cv.imageref, img.getNodeValue()); } else ret = false; return ret; } @Override boolean parseItem(ItemValues iv, Node n) throws FeederException { boolean ret = true; if (n.getNodeName().equalsIgnoreCase("itunes:summary")) setValue(iv.description, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("itunes:duration")) setValue(iv.enclosure_length, getTextValue(n)); else ret = false; return ret; } } // ======================================== // To Support 'dublincore(dc)' Namespace // ======================================== private class NSDcParser extends NSParser { NSDcParser() { super(PRI_DC); } @Override boolean parseItem(ItemValues iv, Node n) throws FeederException { boolean ret = true; if (n.getNodeName().equalsIgnoreCase("dc:date")) setValue(iv.pubDate, getTextValue(n)); else ret = false; return ret; } @Override boolean parseChannel(ChannelValues cv, Node n) { return false; } } // ======================================== // Default RSS Parser // ======================================== private class NSDefaultParser extends NSParser { NSDefaultParser() { super(PRI_DEFAULT); } private void nodeImage(ChannelValues cv, Node n) throws FeederException { n = n.getFirstChild(); while (null != n) { if (n.getNodeName().equalsIgnoreCase("url")) { setValue(cv.imageref, getTextValue(n)); return; } n = n.getNextSibling(); } } private void nodeEnclosure(ItemValues iv, Node n) { NamedNodeMap nnm = n.getAttributes(); n = nnm.getNamedItem("url"); if (null != n) setValue(iv.enclosure_url, n.getNodeValue()); n = nnm.getNamedItem("length"); if (null != n) setValue(iv.enclosure_length, n.getNodeValue()); n = nnm.getNamedItem("type"); if (null != n) setValue(iv.enclosure_type, n.getNodeValue()); } @Override boolean parseChannel(ChannelValues cv, Node n) throws FeederException { boolean ret = true; if (n.getNodeName().equalsIgnoreCase("title")) setValue(cv.title, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("description")) setValue(cv.description, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("image")) nodeImage(cv, n); else ret = false; return ret; } @Override boolean parseItem(ItemValues iv, Node n) throws FeederException { boolean ret = true; if (n.getNodeName().equalsIgnoreCase("title")) setValue(iv.title, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("link")) setValue(iv.link, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("description")) setValue(iv.description, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("enclosure")) nodeEnclosure(iv, n); else if (n.getNodeName().equalsIgnoreCase("pubDate")) setValue(iv.pubDate, getTextValue(n)); else if (n.getNodeName().equalsIgnoreCase("guid")) setValue(iv.guid, getTextValue(n)); else ret = false; return ret; } } // =========================================================== // // =========================================================== private void constructNSParser(LinkedList<NSParser> pl, Node n) throws FeederException { NamedNodeMap nnm = n.getAttributes(); Node nVer = nnm.getNamedItem("version"); /* if (!"2.0".equals(nVer.getNodeValue())) throw new FeederException(Err.ParserUnsupportedVersion); */ // add default namespace parser pl.add(new NSDefaultParser()); // Some element from 'itunes' and 'dc' is supported. // So, check it! if (null != nnm.getNamedItem("xmlns:itunes")) pl.add(new NSItunesParser()); if (null != nnm.getNamedItem("xmlns:dc")) pl.add(new NSDcParser()); } private void nodeChannel(Result res, NSParser[] parser, Node chn) throws FeederException { ChannelValues cv = new ChannelValues(); ItemValues iv = new ItemValues(); // count number of items in this channel LinkedList<Feed.Item.ParD> iteml = new LinkedList<Feed.Item.ParD>(); cv.init(); Node n = chn.getFirstChild(); while (null != n) { if (n.getNodeName().equalsIgnoreCase("item")) { // Parsing elements of 'item' iv.init(); // to reuse Node in = n.getFirstChild(); while (null != in) { for (NSParser p : parser) { if (p.parseItem(iv, in)) break; // handled } in = in.getNextSibling(); } Feed.Item.ParD item = new Feed.Item.ParD(); iv.set(item); if (isValidItem(item)) iteml.addLast(item); } else { for (NSParser p : parser) { if (p.parseChannel(cv, n)) break; // handled } } n = n.getNextSibling(); } cv.set(res.channel); res.items = iteml.toArray(new Feed.Item.ParD[0]); } // false (fail) private boolean verifyNotNullPolicy(Result res) { if (null == res.channel.title) return false; for (Feed.Item.ParD item : res.items) if (null == item.title) return false; return true; } @Override public String dump(UnexpectedExceptionHandler.DumpLevel lv) { return "[ RSSParser ]"; } @Override protected Result parse(Document dom) throws FeederException { Result res = null; UnexpectedExceptionHandler.get().registerModule(this); try { Element root = dom.getDocumentElement(); verifyFormat(root.getNodeName().equalsIgnoreCase("rss")); LinkedList<NSParser> pl = new LinkedList<NSParser>(); constructNSParser(pl, root); res = new Result(); // Some channels use itunes namespace even if they don't have any enclosure media. // So, below check doesn't have any meaning. /* // Channel type which uses itunes namespace is needed to be set as 'Media type'. for (NSParser p : pl.toArray(new NSParser[0])) if (p instanceof NSItunesParser) res.channel.type = Feed.Channel.CHANN_TYPE_MEDIA; */ // For Channel node Node n = findNodeByNameFromSiblings(root.getFirstChild(), "channel"); nodeChannel(res, pl.toArray(new NSParser[0]), n); if (!verifyNotNullPolicy(res)) throw new FeederException(Err.PARSER_UNSUPPORTED_FORMAT); //logI(feed.channel.dump()); } finally { UnexpectedExceptionHandler.get().unregisterModule(this); } return res; } }