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package org.madore.damlengine;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import org.w3c.dom.*;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSParser;
import org.w3c.dom.ls.LSSerializer;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSOutput;
public final class WeblogRSS {
private WeblogRSS() { // Forbid instantiation
throw new AssertionError("WeblogRSS cannot be instantiated");
}
public static void fullProcess(OutputStream out)
throws Exception {
final String weblogBaseURI = "http://www.madore.org/~david/weblog/";
final Connection conn = WeblogDatabaseConnection.getConnection();
final PreparedStatement selSt
= conn.prepareStatement("SELECT id , edate , to_char(cdate,'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') , lang , special_name , title , content FROM entries ORDER BY id DESC LIMIT 25");
final ResultSet selRes = selSt.executeQuery();
final DOMImplementation domi
= (DamlEngine.IncantDOM.getDOMI());
final DOMImplementationLS domils = (DOMImplementationLS)(domi);
LSSerializer ser = domils.createLSSerializer();
ser.getDomConfig().setParameter("xml-declaration", true);
LSParser par = domils.createLSParser(DOMImplementationLS.MODE_SYNCHRONOUS, null);
final LSOutput lsout = domils.createLSOutput();
lsout.setByteStream(out);
lsout.setEncoding("UTF-8");
Document rssDoc = domi.createDocument(DamlEngine.RDF_NS, "rdf:RDF", null);
Element rssRoot = rssDoc.getDocumentElement();
// rssDoc.appendChild(rssDoc.createTextNode("\n"));
rssRoot.setAttributeNS(DamlEngine.XMLNS_NS, "xmlns:rdf", DamlEngine.RDF_NS);
rssRoot.setAttributeNS(DamlEngine.XMLNS_NS, "xmlns", DamlEngine.RSS10_NS);
rssRoot.setAttributeNS(DamlEngine.XMLNS_NS, "xmlns:dc", DamlEngine.DUBLINCORE_NS);
rssRoot.setAttributeNS(DamlEngine.XMLNS_NS, "xmlns:sy", DamlEngine.SYNDICATION_NS);
rssRoot.setAttributeNS(DamlEngine.XML_NS, "xml:lang", "en");
rssRoot.appendChild(rssDoc.createTextNode("\n"));
Element channel = rssDoc.createElementNS(DamlEngine.RSS10_NS, "channel");
rssRoot.appendChild(channel);
rssRoot.appendChild(rssDoc.createTextNode("\n"));
channel.setAttributeNS(DamlEngine.RDF_NS, "rdf:about", weblogBaseURI);
channel.appendChild(rssDoc.createTextNode("\n"));
Element chanTitle = rssDoc.createElementNS(DamlEngine.RSS10_NS, "title");
channel.appendChild(chanTitle);
channel.appendChild(rssDoc.createTextNode("\n"));
chanTitle.appendChild(rssDoc.createTextNode("David Madore's WebLog"));
Element chanLink = rssDoc.createElementNS(DamlEngine.RSS10_NS, "link");
channel.appendChild(chanLink);
channel.appendChild(rssDoc.createTextNode("\n"));
chanLink.appendChild(rssDoc.createTextNode(weblogBaseURI));
Element chanDescription = rssDoc.createElementNS(DamlEngine.RSS10_NS, "description");
channel.appendChild(chanDescription);
channel.appendChild(rssDoc.createTextNode("\n"));
chanDescription.appendChild(rssDoc.createTextNode("David Madore's WebLog"));
Element syUpdatePeriod = rssDoc.createElementNS(DamlEngine.SYNDICATION_NS, "sy:updatePeriod");
channel.appendChild(syUpdatePeriod);
channel.appendChild(rssDoc.createTextNode("\n"));
syUpdatePeriod.appendChild(rssDoc.createTextNode("hourly"));
Element syUpdateFrequency = rssDoc.createElementNS(DamlEngine.SYNDICATION_NS, "sy:updateFrequency");
channel.appendChild(syUpdateFrequency);
channel.appendChild(rssDoc.createTextNode("\n"));
syUpdateFrequency.appendChild(rssDoc.createTextNode("3"));
Element syUpdateBase = rssDoc.createElementNS(DamlEngine.SYNDICATION_NS, "sy:updateBase");
channel.appendChild(syUpdateBase);
channel.appendChild(rssDoc.createTextNode("\n"));
syUpdateBase.appendChild(rssDoc.createTextNode("2003-05-01T10:00:00Z"));
Element chanItems = rssDoc.createElementNS(DamlEngine.RSS10_NS, "items");
channel.appendChild(chanItems);
channel.appendChild(rssDoc.createTextNode("\n"));
chanItems.appendChild(rssDoc.createTextNode("\n"));
Element itemsSeq = rssDoc.createElementNS(DamlEngine.RDF_NS, "rdf:Seq");
chanItems.appendChild(itemsSeq);
chanItems.appendChild(rssDoc.createTextNode("\n"));
itemsSeq.appendChild(rssDoc.createTextNode("\n"));
while ( selRes.next() ) {
final int id = selRes.getInt(1);
final String date = selRes.getString(2);
final String cdate = selRes.getString(3);
final String lang = selRes.getString(4);
final String specialName = selRes.getString(5);
final String title = selRes.getString(6);
final String contentXml = selRes.getString(7);
final Matcher matcher = Pattern.compile("^(\\d{4})-(\\d{2})-(\\d{2})$").matcher(date);
if ( ! matcher.matches() )
throw new IllegalArgumentException("entry "+id+" has badly formed date");
final String yearStr = matcher.group(1);
final String monthStr = matcher.group(2);
final String dayStr = matcher.group(3);
final String numberStr = String.format("%04d",id);
final WeblogLink lk = new WeblogLink(yearStr, monthStr, dayStr,
numberStr, "",
specialName);
lk.setTypeStandard();
final String aboutUri = weblogBaseURI + "#" + lk.getFragment();
final String linkUri = lk.getTarget(weblogBaseURI);
Element li = rssDoc.createElementNS(DamlEngine.RDF_NS, "rdf:li");
itemsSeq.appendChild(li);
itemsSeq.appendChild(rssDoc.createTextNode("\n"));
li.setAttributeNS(DamlEngine.RDF_NS, "rdf:resource",
aboutUri);
Element item = rssDoc.createElementNS(DamlEngine.RSS10_NS, "item");
rssRoot.appendChild(item);
rssRoot.appendChild(rssDoc.createTextNode("\n"));
item.setAttributeNS(DamlEngine.RDF_NS, "rdf:about",
aboutUri);
item.setAttributeNS(DamlEngine.XML_NS, "xml:lang", lang);
item.appendChild(rssDoc.createTextNode("\n"));
Element itemTitle = rssDoc.createElementNS(DamlEngine.RSS10_NS, "title");
item.appendChild(itemTitle);
item.appendChild(rssDoc.createTextNode("\n"));
itemTitle.appendChild(rssDoc.createTextNode(title));
Element itemLink = rssDoc.createElementNS(DamlEngine.RSS10_NS, "link");
item.appendChild(itemLink);
item.appendChild(rssDoc.createTextNode("\n"));
itemLink.appendChild(rssDoc.createTextNode(linkUri));
Element itemDate = rssDoc.createElementNS(DamlEngine.DUBLINCORE_NS, "dc:date");
item.appendChild(itemDate);
item.appendChild(rssDoc.createTextNode("\n"));
itemDate.appendChild(rssDoc.createTextNode(cdate));
LSInput input = domils.createLSInput();
input.setStringData(contentXml);
Document temp = par.parse(input);
String contentStr = temp.getDocumentElement().getTextContent();
int bound;
try {
bound = Character.offsetByCodePoints(contentStr, 0, 500);
} catch (IndexOutOfBoundsException e) {
bound = contentStr.length();
}
String descrStr = contentStr.substring(0, bound).replace("\n"," ");
Element itemDescr = rssDoc.createElementNS(DamlEngine.RSS10_NS, "description");
item.appendChild(itemDescr);
item.appendChild(rssDoc.createTextNode("\n"));
itemDescr.appendChild(rssDoc.createTextNode(descrStr));
}
ser.write(rssDoc, lsout);
out.write("\n".getBytes("UTF-8"));
}
}
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