gnometransformer.java

gcc的组建

  // -- transform --

  /**
   * Transforms the given source and writes the result to the
   * given target.
   */
  public void transform (Source source, Result result)
    throws TransformerException
  {
    if (source instanceof StreamSource)
      {
        try
          {
            StreamSource ss = (StreamSource) source;
            NamedInputStream in = XMLJ.getInputStream (ss);
            String publicId = ss.getPublicId ();
            String systemId = ss.getSystemId ();
            String base = XMLJ.getBaseURI (systemId);
            byte[] detectBuffer = in.getDetectBuffer ();
            if (detectBuffer == null)
              {
                throw new TransformerException ("No document element");
              }
            if (result instanceof StreamResult)
              {
                OutputStream out = XMLJ.getOutputStream ((StreamResult) result);
                transformStreamToStream (in, detectBuffer, publicId, systemId,
                                         base, (resolver != null),
                                         (errorListener != null), out);
              }
            else if (result instanceof DOMResult)
              {
                DOMResult dr = (DOMResult) result;
                GnomeDocument ret =
                  transformStreamToDoc (in, detectBuffer, publicId, systemId,
                                        base, (resolver != null),
                                        (errorListener != null));
                dr.setNode (ret);
                dr.setSystemId (null);
              }
            else if (result instanceof SAXResult)
              {
                SAXResult sr = (SAXResult) result;
                transformStreamToSAX (in, detectBuffer, publicId, systemId,
                                      base, (resolver != null),
                                      (errorListener != null),
                                      getSAXContext (sr));
              }
            else
              {
                String msg = "Result type not supported (" + result + ")";
                throw new TransformerConfigurationException (msg);
              }
          }
        catch (IOException e)
          {
            throw new TransformerException (e);
          }
      }
    else if (source instanceof DOMSource)
      {
        DOMSource ds = (DOMSource) source;
        Node node = ds.getNode ();
        if (!(node instanceof GnomeDocument))
          {
            String msg = "Node is not a GnomeDocument (" + node + ")";
            throw new TransformerException (msg);
          }
        GnomeDocument doc = (GnomeDocument) node;
        if (result instanceof StreamResult)
          {
            try
              {
                OutputStream out = XMLJ.getOutputStream ((StreamResult) result);
                transformDocToStream (doc, out);
              }
            catch (IOException e)
              {
                throw new TransformerException (e);
              }
          }
        else if (result instanceof DOMResult)
          {
            DOMResult dr = (DOMResult) result;
            GnomeDocument ret = transformDocToDoc (doc);
            dr.setNode (ret);
            dr.setSystemId (null);
          }
        else if (result instanceof SAXResult)
          {
            SAXResult sr = (SAXResult) result;
            transformDocToSAX (doc, getSAXContext (sr));
          }
        else
          {
            String msg = "Result type not supported";
            throw new TransformerConfigurationException (msg);
          }
      }
    else
      {
        String msg = "Source type not supported";
        throw new TransformerConfigurationException (msg);
      }
  }

  private GnomeXMLReader getSAXContext (SAXResult result)
  {
    GnomeXMLReader ctx = new GnomeXMLReader ();
    ctx.setContentHandler (result.getHandler ());
    ctx.setLexicalHandler (result.getLexicalHandler ());
    if (errorListener != null)
      {
        ErrorHandler errorHandler =
          new ErrorListenerErrorHandler (errorListener);
        ctx.setErrorHandler (errorHandler);
      }
    if (resolver != null)
      {
        EntityResolver entityResolver =
          new URIResolverEntityResolver (resolver);
        ctx.setEntityResolver (entityResolver);
      }
    return ctx;
  }

  private native void transformStreamToStream (InputStream in,
                                               byte[] detectBuffer,
                                               String publicId,
                                               String systemId,
                                               String base,
                                               boolean entityResolver,
                                               boolean errorHandler,
                                               OutputStream out)
    throws TransformerException;

  private native GnomeDocument transformStreamToDoc (InputStream in,
                                                     byte[] detectBuffer,
                                                     String publicId,
                                                     String systemId,
                                                     String base,
                                                     boolean entityResolver,
                                                     boolean errorHandler)
    throws TransformerException;

  private native void transformStreamToSAX (InputStream in,
                                            byte[] detectBuffer,
                                            String publicId,
                                            String systemId,
                                            String base,
                                            boolean entityResolver,
                                            boolean errorHandler,
                                            GnomeXMLReader out)
    throws TransformerException;

  private native void transformDocToStream (GnomeDocument in,
                                            OutputStream out)
    throws TransformerException;

  private native GnomeDocument transformDocToDoc (GnomeDocument in)
    throws TransformerException;

  private native void transformDocToSAX (GnomeDocument in,
                                         GnomeXMLReader out)
    throws TransformerException;

  /*
   * Retrieve parameters as a string array.
   * This is a convenience method called from native code.
   */
  private String[] getParameterArray ()
  {
    String[] parameterArray = new String[parameters.size () * 2];
    int index = 0;
    for (Iterator it = parameters.keySet ().iterator ();
         it.hasNext ();
         ++index)
      {
        String parameterKey = (String) it.next ();
        String parameterValue = (String) parameters.get (parameterKey);
        parameterArray[index * 2 + 0] = parameterKey;
        parameterArray[index * 2 + 1] =
          "'" + ((parameterValue != null) ? parameterValue : "") + "'";
        // FIXME encode parameter value correctly for XPath
      }
    return parameterArray;
  }

  // -- Free xsltStylesheet handle --

  public void finalize ()
  {
    if (stylesheet != null)
      {
        free ();
        stylesheet = null;
      }
  }

  private native void free ();

  // -- Callbacks --

  private InputStream resolveEntity (String publicId, String systemId)
    throws TransformerException
  {
    if (resolver != null)
      {
        systemId = resolver.resolve (null, systemId).getSystemId ();
      }
    if (systemId == null)
      {
        return null;
      }
    try
      {
        URL url = new URL (systemId);
        return XMLJ.getInputStream (url);
      }
    catch (IOException e)
      {
        throw new TransformerException (e);
      }
  }
  
  private void setDocumentLocator (Object ctx, Object loc)
  {
  }

  private void warning (String message,
                        int lineNumber,
                        int columnNumber,
                        String publicId,
                        String systemId)
    throws TransformerException
  {
    if (errorListener == null)
      {
        return;
      }
    SourceLocator l = new StandaloneLocator (lineNumber,
                                             columnNumber,
                                             publicId,
                                             systemId);
    errorListener.warning (new TransformerException (message, l));
  }

  private void error (String message,
                      int lineNumber,
                      int columnNumber,
                      String publicId,
                      String systemId)
    throws TransformerException
  {
    if (errorListener == null)
      {
        return;
      }
    SourceLocator l = new StandaloneLocator (lineNumber,
                                             columnNumber,
                                             publicId,
                                             systemId);
    errorListener.error (new TransformerException (message, l));
  }
  
  private void fatalError (String message,
                           int lineNumber,
                           int columnNumber,
                           String publicId,
                           String systemId)
    throws TransformerException
  {
    if (errorListener == null)
      {
        return;
      }
    SourceLocator l = new StandaloneLocator (lineNumber,
                                             columnNumber,
                                             publicId,
                                             systemId);
    errorListener.fatalError (new TransformerException (message, l));
  }
  
}