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/* HelpURLConnection.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.help;
import java.io.IOException;
import java.io.InputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Locale;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.grinvin.factories.FactoryManager;
import org.grinvin.invariants.InvariantManager;
import org.grinvin.xml.XMLUtils;
import org.jdom.transform.JDOMSource;
class HelpURLConnection extends URLConnection{
private final String css;
private final String id;
private final String xmlPath;
private boolean connected;
private final Source xsltSource;
private final TransformerFactory transFact;
private final PipedInputStream in;
private final PipedOutputStream out;
private final Result result;
HelpURLConnection(URL url) throws IOException {
super(url);
xsltSource = new StreamSource(HelpURLConnection.class.getResourceAsStream("/org/grinvin/help/" + url.getProtocol() + ".xslt"));
this.transFact = TransformerFactory.newInstance();
transFact.setURIResolver(new HelpURIResolver());
this.id = url.getPath();
if ("graphfactory".equals(url.getProtocol())) {
String base = FactoryManager.getGraphFactoryBroker().get(id).getClass().getName();
this.xmlPath = base.replace('.','/') + ".xml";
} else if ("generator".equals(url.getProtocol())) {
String base = FactoryManager.getGeneratorBroker().get(id).getClass().getName();
this.xmlPath = base.replace('.','/') + ".xml";
}
else
this.xmlPath = InvariantManager.getInstance().getDefinitionPath(id);
this.css = HelpURLConnection.class.getResource("/org/grinvin/helpsets/style.css").toString();
this.in = new PipedInputStream();
this.out = new PipedOutputStream(in);
this.result = new StreamResult(out);
}
synchronized public void connect() throws IOException {
final Source xmlSource = new JDOMSource (XMLUtils.loadFromClassPath(xmlPath));
// cannot use StreamSource because of DTD location
try {
// TODO: please do this off line
final Transformer trans = transFact.newTransformer(xsltSource);
trans.setParameter("locale", Locale.getDefault().toString());
trans.setParameter("th.name", HelpManager.getResourceBundle().getString("th.name"));
trans.setParameter("th.description", HelpManager.getResourceBundle().getString("th.description"));
trans.setParameter("css", css);
trans.setParameter("factory.id", id);
new Thread(
new Runnable(){
public void run(){
try {
trans.transform(xmlSource, result);
out.close();
} catch (TransformerException ex) {
//do nothing?
} catch (IOException ex) {
//do nothing?
}
}
}
).start();
} catch (TransformerException e) {
throw new IOException("Could not connect:" + e);
// TODO: Java 6.0 allows e as second argument
}
connected=true;
}
synchronized public InputStream getInputStream() throws IOException {
if(!connected)
connect();
return in;
}
public String getContentType() {
return "text/html";
}
}
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