Package com.hp.hpl.jena.gvs.services.http

Source Code of com.hp.hpl.jena.gvs.services.http.InfoDiscoBitFilter$InfoBit

/*
(c) Copyright 2005, 2006, Hewlett-Packard Development Company, LP
[See end of file]
$Id: InfoDiscoBitFilter.java,v 1.1 2007/06/04 18:34:10 rebach Exp $
*/
package com.hp.hpl.jena.gvs.services.http;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.wymiwyg.commons.vocabulary.DISCOBITS;
import org.wymiwyg.wrhapi.Handler;
import org.wymiwyg.wrhapi.HandlerException;
import org.wymiwyg.wrhapi.HeaderName;
import org.wymiwyg.wrhapi.MessageBody;
import org.wymiwyg.wrhapi.Request;
import org.wymiwyg.wrhapi.Response;
import org.wymiwyg.wrhapi.filter.Filter;
import org.wymiwyg.wrhapi.util.EnhancedRequest;
import org.wymiwyg.wrhapi.util.MessageBody2Read;

import com.hp.hpl.jena.gvs.GraphOverTime;
import com.hp.hpl.jena.ontology.OntClass;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.ResIterator;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.vocabulary.RDF;

/**
* @author reto
*
*/
public class InfoDiscoBitFilter implements Filter {

  private interface InfoBit {
    String getMimeTypeString();

    MessageBody getContent();
  }

  private final Map<String, InfoBit> infoDiscoBitURIs = new HashMap<String, InfoBit>();

  /**
   * @param trustedGOT
   */
  public InfoDiscoBitFilter(final GraphOverTime trustedGOT) {
    new Thread() {

      @Override
      public void run() {
        while (true) {
          Model model = ModelFactory.createModelForGraph(trustedGOT
              .getGraph(new Date()));
          addURIsForType(model, DISCOBITS.InfoDiscoBit);
          addURIsForType(model, DISCOBITS.XHTMLInfoDiscoBit);
          try {
            Thread.sleep(60 * 1000); // Sleep a minute
          } catch (InterruptedException e) {
            throw new RuntimeException(e);
          }
        }
      }

      private void addURIsForType(Model model, OntClass type) {
        ResIterator subjectIter = model.listSubjectsWithProperty(
            RDF.type, type);
        // model.write(System.out);
        while (subjectIter.hasNext()) {
          Resource infoDiscoResource = subjectIter.nextResource();
          RDFNode infoBitNode = infoDiscoResource.getProperty(
              DISCOBITS.infoBit).getObject();
          if (infoBitNode instanceof Literal) {
            final Literal literaInfoBit = (Literal) infoBitNode;
            infoDiscoBitURIs.put(infoDiscoResource.getURI(),
                new InfoBit() {

                  public MessageBody getContent() {
                    return new MessageBody2Read() {

                      public ReadableByteChannel read()
                          throws IOException {
                        // TODO Auto-generated method
                        // stub
                        return Channels
                            .newChannel(new ByteArrayInputStream(
                                literaInfoBit
                                    .getString()
                                    .getBytes(
                                        "utf-8")));
                      }

                    };
                  }

                  public String getMimeTypeString() {
                    return "application/xhtml+xml";
                  }

                });
          } else {
            final Resource literaInfoBit = (Resource) infoBitNode;
            infoDiscoBitURIs.put(infoDiscoResource.getURI(),
                new InfoBit() {

                  public MessageBody getContent() {
                    return new MessageBody2Read() {

                      public ReadableByteChannel read()
                          throws IOException {
                        // TODO Auto-generated method
                        // stub
                        return Channels
                            .newChannel(new ByteArrayInputStream(
                                (byte[]) literaInfoBit.getRequiredProperty(DISCOBITS.bytes).getLiteral().getValue()
                                    ));
                      }

                    };
                  }

                  public String getMimeTypeString() {
                    return literaInfoBit.getRequiredProperty(DISCOBITS.mediaType).getString();
                  }

                });
          }
        }
      }

    }.start();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.wymiwyg.wrhapi.filter.Filter#handle(org.wymiwyg.wrhapi.Request,
   *      org.wymiwyg.wrhapi.Response, org.wymiwyg.wrhapi.Handler)
   */
  public void handle(Request request, Response response, Handler rest)
      throws HandlerException {
    String requestURL = new EnhancedRequest(request)
        .getRequestURLWithoutParams().toString();
    if (infoDiscoBitURIs.containsKey(requestURL)) {
      InfoBit infoBit = infoDiscoBitURIs.get(requestURL);
      response.setHeader(HeaderName.CONTENT_TYPE, infoBit
          .getMimeTypeString());
      response.setBody(infoBit.getContent());
    } else {
      rest.handle(request, response);
    }
  }

}

/*
* (c) Copyright 2005, 2006 Hewlett-Packard Development Company, LP All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
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