Java tutorial
/* * Copyright 2004 Sun Microsystems, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package com.sun.syndication.io.impl; import com.sun.syndication.feed.WireFeed; import com.sun.syndication.feed.rss.Channel; import com.sun.syndication.feed.rss.Content; import com.sun.syndication.feed.rss.Description; import com.sun.syndication.feed.rss.Image; import com.sun.syndication.feed.rss.Item; import org.jdom2.Attribute; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.Namespace; import java.util.*; /** */ public class RSS091UserlandParser extends RSS090Parser { public RSS091UserlandParser() { this("rss_0.91U"); } protected RSS091UserlandParser(String type) { super(type, null); } public boolean isMyType(Document document) { boolean ok; Element rssRoot = document.getRootElement(); ok = rssRoot.getName().equals("rss"); if (ok) { ok = false; Attribute version = rssRoot.getAttribute("version"); if (version != null) { ok = version.getValue().equals(getRSSVersion()); } } return ok; } protected String getRSSVersion() { return "0.91"; } protected Namespace getRSSNamespace() { return Namespace.getNamespace(""); } /** * To be overriden by RSS 0.91 Netscape and RSS 0.94 */ protected boolean isHourFormat24(Element rssRoot) { return true; } /** * Parses the root element of an RSS document into a Channel bean. * <p/> * It first invokes super.parseChannel and then parses and injects the following * properties if present: language, pubDate, rating and copyright. * <p/> * * @param rssRoot the root element of the RSS document to parse. * @return the parsed Channel bean. */ protected WireFeed parseChannel(Element rssRoot) { Channel channel = (Channel) super.parseChannel(rssRoot); Element eChannel = rssRoot.getChild("channel", getRSSNamespace()); Element e = eChannel.getChild("language", getRSSNamespace()); if (e != null) { channel.setLanguage(e.getText()); } e = eChannel.getChild("rating", getRSSNamespace()); if (e != null) { channel.setRating(e.getText()); } e = eChannel.getChild("copyright", getRSSNamespace()); if (e != null) { channel.setCopyright(e.getText()); } e = eChannel.getChild("pubDate", getRSSNamespace()); if (e != null) { channel.setPubDate(DateParser.parseDate(e.getText())); } e = eChannel.getChild("lastBuildDate", getRSSNamespace()); if (e != null) { channel.setLastBuildDate(DateParser.parseDate(e.getText())); } e = eChannel.getChild("docs", getRSSNamespace()); if (e != null) { channel.setDocs(e.getText()); } e = eChannel.getChild("docs", getRSSNamespace()); if (e != null) { channel.setDocs(e.getText()); } e = eChannel.getChild("managingEditor", getRSSNamespace()); if (e != null) { channel.setManagingEditor(e.getText()); } e = eChannel.getChild("webMaster", getRSSNamespace()); if (e != null) { channel.setWebMaster(e.getText()); } e = eChannel.getChild("skipHours"); if (e != null) { List skipHours = new ArrayList(); List eHours = e.getChildren("hour", getRSSNamespace()); for (int i = 0; i < eHours.size(); i++) { Element eHour = (Element) eHours.get(i); skipHours.add(new Integer(eHour.getText().trim())); } channel.setSkipHours(skipHours); } e = eChannel.getChild("skipDays"); if (e != null) { List skipDays = new ArrayList(); List eDays = e.getChildren("day", getRSSNamespace()); for (int i = 0; i < eDays.size(); i++) { Element eDay = (Element) eDays.get(i); skipDays.add(eDay.getText().trim()); } channel.setSkipDays(skipDays); } return channel; } /** * Parses the root element of an RSS document looking for image information. * <p/> * It first invokes super.parseImage and then parses and injects the following * properties if present: url, link, width, height and description. * <p/> * * @param rssRoot the root element of the RSS document to parse for image information. * @return the parsed RSSImage bean. */ protected Image parseImage(Element rssRoot) { Image image = super.parseImage(rssRoot); if (image != null) { Element eImage = getImage(rssRoot); Element e = eImage.getChild("width", getRSSNamespace()); if (e != null) { Integer val = NumberParser.parseInt(e.getText()); if (val != null) { image.setWidth(val.intValue()); } } e = eImage.getChild("height", getRSSNamespace()); if (e != null) { Integer val = NumberParser.parseInt(e.getText()); if (val != null) { image.setHeight(val.intValue()); } } e = eImage.getChild("description", getRSSNamespace()); if (e != null) { image.setDescription(e.getText()); } } return image; } /** * It looks for the 'item' elements under the 'channel' elemment. */ protected List getItems(Element rssRoot) { Element eChannel = rssRoot.getChild("channel", getRSSNamespace()); return (eChannel != null) ? eChannel.getChildren("item", getRSSNamespace()) : Collections.EMPTY_LIST; } /** * It looks for the 'image' elements under the 'channel' elemment. */ protected Element getImage(Element rssRoot) { Element eChannel = rssRoot.getChild("channel", getRSSNamespace()); return (eChannel != null) ? eChannel.getChild("image", getRSSNamespace()) : null; } /** * To be overriden by RSS 0.91 Netscape parser */ protected String getTextInputLabel() { return "textInput"; } /** * It looks for the 'textinput' elements under the 'channel' elemment. */ protected Element getTextInput(Element rssRoot) { String elementName = getTextInputLabel(); Element eChannel = rssRoot.getChild("channel", getRSSNamespace()); return (eChannel != null) ? eChannel.getChild(elementName, getRSSNamespace()) : null; } /** * Parses an item element of an RSS document looking for item information. * <p/> * It first invokes super.parseItem and then parses and injects the description property if present. * <p/> * * @param rssRoot the root element of the RSS document in case it's needed for context. * @param eItem the item element to parse. * @return the parsed RSSItem bean. */ protected Item parseItem(Element rssRoot, Element eItem) { Item item = super.parseItem(rssRoot, eItem); Element e = eItem.getChild("description", getRSSNamespace()); if (e != null) { item.setDescription(parseItemDescription(rssRoot, e)); } Element ce = eItem.getChild("encoded", getContentNamespace()); if (ce != null) { Content content = new Content(); content.setType(Content.HTML); content.setValue(ce.getText()); item.setContent(content); } return item; } protected Description parseItemDescription(Element rssRoot, Element eDesc) { Description desc = new Description(); desc.setType("text/plain"); desc.setValue(eDesc.getText()); return desc; } }