How to use

DereferenceException

in

net.sf.taverna.t2.reference

public InputStream openStream(ReferenceContext context)
    throws DereferenceException {
  throw new DereferenceException("Can't dereference VM objects");
}

/**
 * Return the data at the {@link URL} represented by this external reference
 */
public InputStream openStream(ReferenceContext context)
    throws DereferenceException {
  try {
    return httpUrl.openStream();
  } catch (IOException e) {
    throw new DereferenceException(e);
  }
}

/**
 * Return the data at the {@link URL} represented by this external reference
 */
public InputStream openStream(ReferenceContext context)
    throws DereferenceException {
  try {
    return httpUrl.openStream();
  } catch (IOException e) {
    throw new DereferenceException(e);
  }
}

/**
 * Return the data at the {@link URL} represented by this external reference
 */
public InputStream openStream(ReferenceContext context)
    throws DereferenceException {
  try {
    return httpUrl.openStream();
  } catch (IOException e) {
    throw new DereferenceException(e);
  }
}

/**
 * Fakes a de-reference operation, returning a byte stream over the string
 * data.
 */
public InputStream openStream(ReferenceContext arg0) {
  try {
    return new ByteArrayInputStream(this.contents
        .getBytes(getCharset()));
  } catch (UnsupportedEncodingException e) {
    throw new DereferenceException(e);
  }
}

/**
 * Fakes a de-reference operation, returning a byte stream over the string
 * data.
 */
public InputStream openStream(ReferenceContext arg0) {
  try {
    return new ByteArrayInputStream(this.contents
        .getBytes(getCharset()));
  } catch (UnsupportedEncodingException e) {
    throw new DereferenceException(e);
  }
}

/**
 * Fakes a de-reference operation, returning a byte stream over the string
 * data.
 */
public InputStream openStream(ReferenceContext arg0) {
  try {
    return new ByteArrayInputStream(this.contents
        .getBytes(getCharset()));
  } catch (UnsupportedEncodingException e) {
    throw new DereferenceException(e);
  }
}

/**
 * {@inheritDoc}
 */
@Override
public String getCharset() throws DereferenceException {
  if (!httpUrl.getProtocol().equals("http")) {
    return null; // Don't know
  }
  HeadMethod method = new HeadMethod(httpUrl.toExternalForm());
  HttpClient httpClient = new HttpClient();
  try {
    httpClient.executeMethod(method);
    return method.getResponseCharSet();
  } catch (HttpException e) {
    throw new DereferenceException(e);
  } catch (IOException e) {
    throw new DereferenceException(e);
  } finally {
    method.releaseConnection();
  }
}

/**
 * {@inheritDoc}
 */
@Override
public String getCharset() throws DereferenceException {
  if (!httpUrl.getProtocol().equals("http")) {
    return null; // Don't know
  }
  HeadMethod method = new HeadMethod(httpUrl.toExternalForm());
  HttpClient httpClient = new HttpClient();
  try {
    httpClient.executeMethod(method);
    return method.getResponseCharSet();
  } catch (HttpException e) {
    throw new DereferenceException(e);
  } catch (IOException e) {
    throw new DereferenceException(e);
  } finally {
    method.releaseConnection();
  }
}

/**
 * Fakes a de-reference operation, returning a byte stream over the node.
 */
public InputStream openStream(ReferenceContext context) {
  try {
    String result = "";
    if (node == null) {
      result = "";
    } else if (node.isLiteral()) {
      result = ((Literal) node).getLexicalForm();
    } else if (node.isResource()) {
      Resource resource = (Resource) node;
      if (resource.isURIResource()) {
        result = resource.getURI();
      } else {
        Model model = ResourceUtils.reachableClosure(resource);
        StringWriter stringWriter = new StringWriter();
        model.write(stringWriter, "RDF/XML-ABBREV");
        result = stringWriter.toString();
      }
    }
    return new ByteArrayInputStream(result.getBytes(getCharset()));
  } catch (UnsupportedEncodingException e) {
    throw new DereferenceException(e);
  }
}