transformerimpl.java

linux下建立JAVA虚拟机的源码KAFFE

          {
            if (errorListener != null)
              errorListener.error(new TransformerException(e));
            else
              e.printStackTrace(System.err);
          }
      }
  }

  /**
   * Strip whitespace from the source tree.
   */
  static boolean strip(Stylesheet stylesheet, Node node)
    throws TransformerConfigurationException
  {
    short nt = node.getNodeType();
    if (nt == Node.ENTITY_REFERENCE_NODE)
      {
        // Replace entity reference with its content
        Node parent = node.getParentNode();
        Node nextSibling = node.getNextSibling();
        Node child = node.getFirstChild();
        while (child != null)
          {
            Node next = child.getNextSibling();
            node.removeChild(child);
            if (nextSibling != null)
              parent.insertBefore(child, nextSibling);
            else
              parent.appendChild(child);
            child = next;
          }
        return true;
      }
    if (nt == Node.TEXT_NODE || nt == Node.CDATA_SECTION_NODE)
      {
        // Denormalize text into whitespace and non-whitespace nodes
        String text = node.getNodeValue();
        String[] tokens = tokenizeWhitespace(text);
        if (tokens.length > 1)
          {
            node.setNodeValue(tokens[0]);
            Node parent = node.getParentNode();
            Node nextSibling = node.getNextSibling();
            Document doc = node.getOwnerDocument();
            for (int i = 1; i < tokens.length; i++)
              {
                Node newChild = (nt == Node.CDATA_SECTION_NODE) ?
                  doc.createCDATASection(tokens[i]) :
                  doc.createTextNode(tokens[i]);
                if (nextSibling != null)
                  parent.insertBefore(newChild, nextSibling);
                else
                  parent.appendChild(newChild);
              }
          }
        return !stylesheet.isPreserved((Text) node, true);
      }
    else
      {
        Node child = node.getFirstChild();
        while (child != null)
          {
            boolean remove = strip(stylesheet, child);
            Node next = child.getNextSibling();
            if (remove)
              node.removeChild(child);
            child = next;
          }
      }
    return false;
  }

  /**
   * Tokenize the specified text into contiguous whitespace-only and
   * non-whitespace chunks.
   */
  private static String[] tokenizeWhitespace(String text)
  {
    int len = text.length();
    int start = 0, end = len - 1;
    // Find index of text start
    for (int i = 0; i < len; i++)
      {
        char c = text.charAt(i);
        boolean whitespace = (c == ' ' || c == '\n' || c == '\t' || c == '\r');
        if (whitespace)
          start++;
        else
          break;
      }
    if (start == end) // all whitespace
      return new String[] { text };
    // Find index of text end
    for (int i = end; i > start; i--)
      {
        char c = text.charAt(i);
        boolean whitespace = (c == ' ' || c == '\n' || c == '\t' || c == '\r');
        if (whitespace)
          end--;
        else
          break;
      }
    if (start == 0 && end == len - 1) // all non-whitespace
      return new String[] { text };
    // whitespace, then text, then whitespace
    String[] ret = (start > 0 && end < len - 1) ?
      new String[3] : new String[2];
    int i = 0;
    if (start > 0)
      ret[i++] = text.substring(0, start);
    ret[i++] = text.substring(start, end + 1);
    if (end < len - 1)
      ret[i++] = text.substring(end + 1);
    return ret;
  }

  /**
   * Obtain a suitable output stream for writing the result to,
   * and use the StreamSerializer to write the result tree to the stream.
   */
  void writeStreamResult(Node node, StreamResult sr, int outputMethod,
                         String encoding)
    throws IOException
  {
    OutputStream out = null;
    boolean created = false;
    try
      {
        out = sr.getOutputStream();
        if (out == null)
          {
            Writer writer = sr.getWriter();
            if (writer != null)
              out = new WriterOutputStream(writer);
          }
        if (out == null)
          {
            String systemId = sr.getSystemId();
            try
              {
                URL url = new URL(systemId);
                URLConnection connection = url.openConnection();
                // We need to call setDoInput(false), because our
                // implementation of the file protocol allows writing
                // (unlike Sun), but it will fail with a FileNotFoundException
                // if we also open the connection for input and the output
                // file doesn't yet exist.
                connection.setDoInput(false);
                connection.setDoOutput(true);
                out = connection.getOutputStream();
              }
            catch (MalformedURLException e)
              {
                out = new FileOutputStream(systemId);
              }
            catch (UnknownServiceException e)
              {
                URL url = new URL(systemId);
                out = new FileOutputStream(url.getPath());
              }
            created = true;
          }
        out = new BufferedOutputStream(out);
        StreamSerializer serializer =
          new StreamSerializer(outputMethod, encoding, null);
        if (stylesheet != null)
          {
            Collection celem = stylesheet.outputCdataSectionElements;
            serializer.setCdataSectionElements(celem);
          }
        serializer.serialize(node, out);
        out.flush();
      }
    finally
      {
        try
          {
            if (out != null && created)
              out.close();
          }
        catch (IOException e)
          {
          }
      }
  }

  void copyChildren(Document dstDoc, Node src, Node dst)
  {
    Node srcChild = src.getFirstChild();
    while (srcChild != null)
      {
        Node dstChild = dstDoc.adoptNode(srcChild);
        dst.appendChild(dstChild);
        srcChild = srcChild.getNextSibling();
      }
  }

  public void setParameter(String name, Object value)
  {
    if (stylesheet != null)
      stylesheet.bindings.set(new QName(null, name), value, Bindings.PARAM);
  }

  public Object getParameter(String name)
  {
    if (stylesheet != null)
      return stylesheet.bindings.get(new QName(null, name), null, 1, 1);
    return null;
  }

  public void clearParameters()
  {
    if (stylesheet != null)
      {
        stylesheet.bindings.pop(Bindings.PARAM);
        stylesheet.bindings.push(Bindings.PARAM);
      }
  }

  public void setURIResolver(URIResolver resolver)
  {
    uriResolver = resolver;
  }

  public URIResolver getURIResolver()
  {
    return uriResolver;
  }

  public void setOutputProperties(Properties oformat)
    throws IllegalArgumentException
  {
    if (oformat == null)
      outputProperties.clear();
    else
      outputProperties.putAll(oformat);
  }

  public Properties getOutputProperties()
  {
    return (Properties) outputProperties.clone();
  }

  public void setOutputProperty(String name, String value)
    throws IllegalArgumentException
  {
    outputProperties.put(name, value);
  }

  public String getOutputProperty(String name)
    throws IllegalArgumentException
  {
    return outputProperties.getProperty(name);
  }

  public void setErrorListener(ErrorListener listener)
  {
    errorListener = listener;
  }

  public ErrorListener getErrorListener()
  {
    return errorListener;
  }

  static final String INDENT_WHITESPACE = "  ";

  /*
   * Apply indent formatting to the given tree.
   */
  void reindent(Document doc, Node node, int offset)
  {
    if (node.hasChildNodes())
      {
        boolean markupContent = false;
        boolean textContent = false;
        List children = new LinkedList();
        Node ctx = node.getFirstChild();
        while (ctx != null)
          {
            switch (ctx.getNodeType())
              {
              case Node.ELEMENT_NODE:
              case Node.PROCESSING_INSTRUCTION_NODE:
              case Node.DOCUMENT_TYPE_NODE:
                markupContent = true;
                break;
              case Node.TEXT_NODE:
              case Node.CDATA_SECTION_NODE:
              case Node.ENTITY_REFERENCE_NODE:
              case Node.COMMENT_NODE:
                textContent = true;
                break;
              }
            children.add(ctx);
            ctx = ctx.getNextSibling();
          }
        if (markupContent)
          {
            if (textContent)
              {
                // XXX handle mixed content differently?
              }
            int nodeType = node.getNodeType();
            if (nodeType == Node.DOCUMENT_NODE)
              {
                for (Iterator i = children.iterator(); i.hasNext(); )
                  {
                    ctx = (Node) i.next();
                    reindent(doc, ctx, offset);
                  }
              }
            else
              {
                StringBuffer buf = new StringBuffer();
                buf.append('\n');
                for (int i = 0; i < offset + 1; i++)
                  buf.append(INDENT_WHITESPACE);
                String ws = buf.toString();
                for (Iterator i = children.iterator(); i.hasNext(); )
                  {
                    ctx = (Node) i.next();
                    node.insertBefore(doc.createTextNode(ws), ctx);
                    reindent(doc, ctx, offset + 1);
                  }
                buf = new StringBuffer();
                buf.append('\n');
                for (int i = 0; i < offset; i++)
                  buf.append(INDENT_WHITESPACE);
                ws = buf.toString();
                node.appendChild(doc.createTextNode(ws));
              }
          }
      }
  }

  /**
   * Converts the text node children of any cdata-section-elements in the
   * tree to CDATA section nodes.
   */
  void convertCdataSectionElements(Document doc, Node node, List list)
  {
    if (node.getNodeType() == Node.ELEMENT_NODE)
      {
        boolean match = false;
        for (Iterator i = list.iterator(); i.hasNext(); )
          {
            QName qname = (QName) i.next();
            if (match(qname, node))
              {
                match = true;
                break;
              }
          }
        if (match)
          {
            Node ctx = node.getFirstChild();
            while (ctx != null)
              {
                if (ctx.getNodeType() == Node.TEXT_NODE)
                  {
                    Node cdata = doc.createCDATASection(ctx.getNodeValue());
                    node.replaceChild(cdata, ctx);
                    ctx = cdata;
                  }
                ctx = ctx.getNextSibling();
              }
          }
      }
    Node ctx = node.getFirstChild();
    while (ctx != null)
      {
        if (ctx.hasChildNodes())
          convertCdataSectionElements(doc, ctx, list);
        ctx = ctx.getNextSibling();
      }
  }

  boolean match(QName qname, Node node)
  {
    String ln1 = qname.getLocalPart();
    String ln2 = node.getLocalName();
    if (ln2 == null)
      return ln1.equals(node.getNodeName());
    else
      {
        String uri1 = qname.getNamespaceURI();
        String uri2 = node.getNamespaceURI();
        return (uri1.equals(uri2) && ln1.equals(ln2));
      }
  }

}