I just notice that the deprecated folder from cvs
contains XMLDBGenerator and XMLDBCollectionGenerator.
But I never tried out. Anyway, would you suggest how I
could fix my generator to non-cached?
Thanks.
--- Ken C <[EMAIL PROTECTED]> wrote:
> Hi,
> Having read the "write a custom generator"
> tutorial, I am trying to write one that hooks up a
> connection to an xmldb -- eXist; and then get an xml
> back based on a request parameter. Everything seems
> to
> work fine for the first time the request is made.
> Different request parameters on subsequent request
> won't result a correct xml. I suspect that this
> generator may have been cached, which is not what I
> want. Following is the code, it's ugly but just a
> first try...
>
> ==========================================
>
> import
> org.apache.cocoon.generation.AbstractGenerator;
> import org.xml.sax.helpers.AttributesImpl;
> import org.xml.sax.SAXException;
> // for the setup() method
> import org.apache.cocoon.environment.SourceResolver;
> import java.util.Map;
> import
> org.apache.avalon.framework.parameters.Parameters;
> import org.apache.cocoon.ProcessingException;
> import java.io.IOException;
> // used to deal with the request parameters.
> import
> org.apache.cocoon.environment.ObjectModelHelper;
> import org.apache.cocoon.environment.Request;
> import java.util.Enumeration;
> import java.util.Date;
>
> //xmldb
> import org.xmldb.api.base.*;
> import org.xmldb.api.modules.*;
> import org.xmldb.api.*;
>
> public class ThreadGenerator extends
> AbstractGenerator
>
> {
> // Will be initialized in the setup() method and
> used in generate()
> Request request = null;
> String threadID = null; //the thread we are
> looking for
> //todo: set threadID as
> a
> static final variable
>
> //xmldb
> String driver = null;
> Database database = null;
> Collection col = null;
> String[] resources = null;
> XMLResource xmlres = null;
> String forumURI =
> "xmldb:exist:///db/cocoon/forum"; //db root
>
>
> public void setup(SourceResolver resolver, Map
> objectModel,
> String src, Parameters parameters)
> throws ProcessingException, SAXException,
> IOException
> {
> super.setup(resolver, objectModel, src,
> parameters);
> request =
> ObjectModelHelper.getRequest(objectModel);
> forumURI = forumURI + "/" +
> request.getParameter("groupID");
> forumURI = forumURI + "/" +
> request.getParameter("forumID");
>
> //xmldb
> try {
> driver = "org.exist.xmldb.DatabaseImpl";
> //todo: parameters.getParameter("driver");
> Class cl = Class.forName(driver);
> database = (Database)cl.newInstance();
> DatabaseManager.registerDatabase(database);
> database.setProperty("create-database",
> "true");
>
>
> col =
> DatabaseManager.getCollection(forumURI);
>
> col.setProperty("pretty", "true");
> col.setProperty("encoding", "UTF-8");
>
> this.getLogger().debug("getting threadID");
> threadID = request.getParameter("threadID")
> +
> ".xml"; //todo: set threadID as a static final
> variable
> resources = col.listResources();
> this.getLogger().debug("getting threadID
> done...");
>
> }
> catch(Exception e){}
> }
> /**
> * Implement the generate() method from
> AbstractGenerator.
> */
> public void generate() throws SAXException
> {
>
> if (threadID!=null)
> {
> try {
>
> xmlres =
> (XMLResource)col.getResource(threadID);
> if (xmlres==null)
> throw new SAXException("Resource not
> found:" + threadID + "doesn't not exist");
>
>
> xmlres.getContentAsSAX(this.contentHandler);
>
> contentHandler.startDocument();
> contentHandler.endDocument();
>
> }
>
> catch (Exception e){}
> }
> }
> public void recycle() {
> super.recycle();
> this.request = null;
> driver = null;
>
> try {
> col.close();
> DatabaseManager.deregisterDatabase(database);
> }
> catch (Exception e){}
> database = null;
> resources = null;
> xmlres = null;
> forumURI = null;
> }
> }
> //end class
>
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