package org.jjcarr; import java.io.StringWriter; import java.io.Writer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Result; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Text; /** * @see http://web.resource.org/rss/1.0/spec * * @author Jake Carr <resume@dawley-carr.org> * * @version 2006-09-10 */ public class RSS { public static class Item { public String getTitle() { return fTitle; } public void setTitle(String title) { fTitle = title; } public String getLink() { return fLink; } public void setLink(String link) { fLink = link; } public String getDescription() { return fDescription; } public void setDescription(String description) { fDescription = description; } private String fTitle = null; private String fLink = null; private String fDescription = null; } public RSS() { // does nothing } @Override public String toString() { // input Document document = toDocument(); Source source = new DOMSource(document); // output Writer writer = new StringWriter(); Result result = new StreamResult(writer); TransformerFactory factory = TransformerFactory.newInstance(); try { Transformer transformer = factory.newTransformer(); transformer.transform(source, result); } catch (Exception exception) { throw new IllegalArgumentException(exception); } return writer.toString(); } public Document toDocument() { Document document = null; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); try { DocumentBuilder builder = factory.newDocumentBuilder(); document = builder.newDocument(); } catch (Exception exception) { throw new IllegalArgumentException(exception); } Element rootElement = document.createElement("rdf:RDF"); document.appendChild(rootElement); for (String key : kAttr.keySet()) { String value = kAttr.get(key); rootElement.setAttribute(key, value); } addChannelElement(rootElement); addItemElement(rootElement); return document; } private void addChannelElement(Element rootElement) { Document document = rootElement.getOwnerDocument(); Element channelElement = document.createElement("channel"); rootElement.appendChild(channelElement); if (fAbout != null) { channelElement.setAttribute("rdf:about", fAbout); } if (fTitle != null) { Element element = document.createElement("title"); channelElement.appendChild(element); Text test = document.createTextNode(fTitle); element.appendChild(test); } if (fLink != null) { Element element = document.createElement("link"); channelElement.appendChild(element); Text test = document.createTextNode(fLink); element.appendChild(test); } if (fDescription != null) { Element element = document.createElement("description"); channelElement.appendChild(element); Text test = document.createTextNode(fDescription); element.appendChild(test); } if (fImage != null) { Element element = document.createElement("image"); channelElement.appendChild(element); element.setAttribute("rdf:resource", fImage); } Element itemsElement = document.createElement("items"); channelElement.appendChild(itemsElement); Element seqElement = document.createElement("rdf:Seq"); itemsElement.appendChild(seqElement); for (Item item : fItemList) { Element liElement = document.createElement("rdf:li"); seqElement.appendChild(liElement); liElement.setAttribute("resource", item.getLink()); } } private void addItemElement(Element rootElement) { Document document = rootElement.getOwnerDocument(); for (Item item : fItemList) { Element itemElement = document.createElement("item"); rootElement.appendChild(itemElement); if (item.getTitle() != null) { itemElement.setAttribute("rdf:about", item.getLink()); Element element = document.createElement("title"); itemElement.appendChild(element); Text text = document.createTextNode(item.getTitle()); element.appendChild(text); } if (item.getLink() != null) { Element element = document.createElement("link"); itemElement.appendChild(element); Text text = document.createTextNode(item.getLink()); element.appendChild(text); } if (item.getDescription() != null) { Element element = document.createElement("description"); itemElement.appendChild(element); Text text = document.createTextNode(item.getDescription()); element.appendChild(text); } } } public String getAbout() { return fAbout; } public void setAbout(String about) { fAbout = about; } public String getTitle() { return fTitle; } public void setTitle(String title) { fTitle = title; } public String getLink() { return fLink; } public void setLink(String link) { fLink = link; } public String getDescription() { return fDescription; } public void setDescription(String description) { fDescription = description; } public String getImage() { return fImage; } public void setImage(String image) { fImage = image; } public void addItem(Item item) { fItemList.add(item); } private static final Map kAttr = new HashMap(); static { kAttr.put("xmlns", "http://purl.org/rss/1.0/"); kAttr.put("xmlns:rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#"); } private String fAbout; private String fTitle; private String fLink; private String fDescription; private String fImage; private List fItemList = new ArrayList(); }