xsltprocessorapplet.java

来自「JAVA 所有包」· Java 代码 · 共 778 行 · 第 1/2 页

   * @param s String to escape
   *
   * The escaped string.
   */
  public String escapeString(String s)
  {
    StringBuffer sb = new StringBuffer();
    int length = s.length();

    for (int i = 0; i < length; i++)
    {
      char ch = s.charAt(i);

      if ('<' == ch)
      {
        sb.append("&lt;");
      }
      else if ('>' == ch)
      {
        sb.append("&gt;");
      }
      else if ('&' == ch)
      {
        sb.append("&amp;");
      }
      else if (0xd800 <= ch && ch < 0xdc00)
      {
        // UTF-16 surrogate
        int next;

        if (i + 1 >= length)
        {
          throw new RuntimeException(
            XSLMessages.createMessage(
              XSLTErrorResources.ER_INVALID_UTF16_SURROGATE,
              new Object[]{ Integer.toHexString(ch) }));  //"Invalid UTF-16 surrogate detected: "

          //+Integer.toHexString(ch)+ " ?");
        }
        else
        {
          next = s.charAt(++i);

          if (!(0xdc00 <= next && next < 0xe000))
            throw new RuntimeException(
              XSLMessages.createMessage(
                XSLTErrorResources.ER_INVALID_UTF16_SURROGATE,
                new Object[]{
                  Integer.toHexString(ch) + " "
                  + Integer.toHexString(next) }));  //"Invalid UTF-16 surrogate detected: "

          //+Integer.toHexString(ch)+" "+Integer.toHexString(next));
          next = ((ch - 0xd800) << 10) + next - 0xdc00 + 0x00010000;
        }
        sb.append("&#x");
        sb.append(Integer.toHexString(next));
        sb.append(";");
      }
      else
      {
        sb.append(ch);
      }
    }
    return sb.toString();
  }

  /**
   * Assuming the stylesheet URL and the input XML URL have been set,
   * perform the transformation and return the result as a String.
   *
   * @return A string that contains the contents pointed to by the URL.
   *
   */
  public String getHtmlText()
  {
    m_trustedAgent.m_getData = true;
    m_callThread = Thread.currentThread();
    try
    {
      synchronized (m_callThread)
      {
        m_callThread.wait();
      }
    }
    catch (InterruptedException ie)
    {
      System.out.println(ie.getMessage());
    }
    return m_htmlText;
  }

  /**
   * Get an XML document (or stylesheet)
   *
   * @param treeURL valid URL string for the document.
   *
   * @return document
   *
   * @throws IOException
   */
  public String getTreeAsText(String treeURL) throws IOException
  {
    m_treeURL = treeURL;
    m_trustedAgent.m_getData = true;
    m_trustedAgent.m_getSource = true;
    m_callThread = Thread.currentThread();
    try
    {
      synchronized (m_callThread)
      {
        m_callThread.wait();
      }
    }
    catch (InterruptedException ie)
    {
      System.out.println(ie.getMessage());
    }
    return m_sourceText;
  }
  
  /**
   * Use a Transformer to copy the source document
   * to a StreamResult.
   * 
   * @return the document as a string
   */
  private String getSource() throws TransformerException
  {
    StringWriter osw = new StringWriter();
    PrintWriter pw = new PrintWriter(osw, false);
    String text = "";
    try
    {
      URL docURL = new URL(m_documentBase, m_treeURL);
      synchronized (m_tfactory)
      {
        Transformer transformer = m_tfactory.newTransformer();
        StreamSource source = new StreamSource(docURL.toString());    
        StreamResult result = new StreamResult(pw);
        transformer.transform(source, result);
        text = osw.toString();
      }
    }
    catch (MalformedURLException e)
    {
      e.printStackTrace();
      throw new RuntimeException(e.getMessage());
    }      
    catch (Exception any_error)
    {
      any_error.printStackTrace();
    }
    return text;
  }

  /**
   * Get the XML source Tree as a text string suitable
   * for display in a browser.  Note that this is for display of the
   * XML itself, not for rendering of HTML by the browser.
   *
   * @return XML source document as a string.
   * @throws Exception thrown if tree can not be converted.
   */
  public String getSourceTreeAsText() throws Exception
  {
    return getTreeAsText(m_documentURL);
  }

  /**
   * Get the XSL style Tree as a text string suitable
   * for display in a browser.  Note that this is for display of the
   * XML itself, not for rendering of HTML by the browser.
   *
   * @return The XSL stylesheet as a string.
   * @throws Exception thrown if tree can not be converted.
   */
  public String getStyleTreeAsText() throws Exception
  {
    return getTreeAsText(m_styleURL);
  }

  /**
   * Get the HTML result Tree as a text string suitable
   * for display in a browser.  Note that this is for display of the
   * XML itself, not for rendering of HTML by the browser.
   *
   * @return Transformation result as unmarked text.
   * @throws Exception thrown if tree can not be converted.
   */
  public String getResultTreeAsText() throws Exception
  {
    return escapeString(getHtmlText());
  }

  /**
   * Process a document and a stylesheet and return
   * the transformation result.  If one of these is null, the
   * existing value (of a previous transformation) is not affected.
   *
   * @param doc URL string to XML document
   * @param style URL string to XSL stylesheet
   *
   * @return HTML transformation result
   */
  public String transformToHtml(String doc, String style)
  {

    if (null != doc)
    {
      m_documentURL = doc;
    }

    if (null != style)
    {
      m_styleURL = style;
    }

    return getHtmlText();
  }

  /**
   * Process a document and a stylesheet and return
   * the transformation result. Use the xsl:stylesheet PI to find the
   * document, if one exists.
   *
   * @param doc  URL string to XML document containing an xsl:stylesheet PI.
   *
   * @return HTML transformation result
   */
  public String transformToHtml(String doc)
  {

    if (null != doc)
    {
      m_documentURL = doc;
    }

    m_styleURL = null;

    return getHtmlText();
  }


  /**
   * Process the transformation.
   *
   * @return The transformation result as a string.
   *
   * @throws TransformerException
   */
  private String processTransformation() throws TransformerException
  {
    String htmlData = null;
    this.showStatus("Waiting for Transformer and Parser to finish loading and JITing...");
    
    synchronized (m_tfactory)
    {
     URL documentURL = null;
      URL styleURL = null;
      StringWriter osw = new StringWriter();
      PrintWriter pw = new PrintWriter(osw, false);
      StreamResult result = new StreamResult(pw);
    
      this.showStatus("Begin Transformation...");
      try
      {
        documentURL = new URL(m_codeBase, m_documentURL);
        StreamSource xmlSource = new StreamSource(documentURL.toString());

        styleURL = new URL(m_codeBase, m_styleURL);
        StreamSource xslSource = new StreamSource(styleURL.toString());

        Transformer transformer = m_tfactory.newTransformer(xslSource);

        
        Enumeration m_keys = m_parameters.keys();
        while (m_keys.hasMoreElements()){
          Object key = m_keys.nextElement();
          Object expression = m_parameters.get(key);
          transformer.setParameter((String) key, expression);
        }
        transformer.transform(xmlSource, result);
      }
      catch (TransformerConfigurationException tfe)
      {
        tfe.printStackTrace();
        throw new RuntimeException(tfe.getMessage());
      }
      catch (MalformedURLException e)
      {
        e.printStackTrace();
        throw new RuntimeException(e.getMessage());
      }
	  
      this.showStatus("Transformation Done!");
      htmlData = osw.toString();
    }
    return htmlData;
  }

  /**
   * This class maintains a worker thread that that is
   * trusted and can do things like access data.  You need
   * this because the thread that is called by the browser
   * is not trusted and can't access data from the URLs.
   */
  class TrustedAgent implements Runnable
  {

    /** 
     * Specifies whether the worker thread should perform a transformation.
     */
    public boolean m_getData = false;

    /** 
     * Specifies whether the worker thread should get an XML document or XSL stylesheet.
     */
    public boolean m_getSource = false;

    /**
     * The real work is done from here.
     *
     */
    public void run()
    {
      while (true)
      {
        m_trustedWorker.yield();

        if (m_getData)  // Perform a transformation or get a document.
        {
          try
          {
            m_getData = false;
            m_htmlText = null;
            m_sourceText = null;
            if (m_getSource)  // Get a document.
            {
              m_getSource = false;
              m_sourceText = getSource();
            }
            else              // Perform a transformation.
              m_htmlText = processTransformation();
          }
          catch (Exception e)
          {
            e.printStackTrace();
          }
          finally
          {
            synchronized (m_callThread)
            {
              m_callThread.notify();
            }
          }
        }
        else
        {
          try
          {
            m_trustedWorker.sleep(50);
          }
          catch (InterruptedException ie)
          {
            ie.printStackTrace();
          }
        }
      }
    }
  }
  
  // For compatiblity with old serialized objects
  // We will change non-serialized fields and change methods
  // and not have this break us.
  private static final long serialVersionUID=4618876841979251422L;
  
  // For compatibility when de-serializing old objects
  private void readObject(java.io.ObjectInputStream inStream) throws IOException, ClassNotFoundException 
  {
      inStream.defaultReadObject();
      
      // Needed assignment of non-serialized fields
      
      // A TransformerFactory is not guaranteed to be serializable, 
      // so we create one here
      m_tfactory = TransformerFactory.newInstance();
  }      
}