calloutemitter.java

jboss规则引擎

    try {
      rtfEmitter.characters(chars, 0, numBlanks);
    } catch (TransformerException e) {
      System.out.println("Transformer Exception in formatPad");
    }
  }

  /**
   * <p>Add a callout to the global callout array</p>
   *
   * <p>This method examines a callout <tt>area</tt> and adds it to
   * the global callout array if it can be interpreted.</p>
   *
   * <p>Only the <tt>linecolumn</tt> and <tt>linerange</tt> units are
   * supported. If no unit is specifed, <tt>linecolumn</tt> is assumed.
   * If only a line is specified, the callout decoration appears in
   * the <tt>defaultColumn</tt>.</p>
   *
   * @param coNum The callout number.
   * @param node The <tt>area</tt>.
   * @param defaultColumn The default column for callouts.
   */
  protected void addCallout (int coNum,
			     Node node,
			     int defaultColumn) {

    Element area  = (Element) node;
    String units  = null;
    String coords = null;

    if (area.hasAttribute("units")) {
      units = area.getAttribute("units");
    }

    if (area.hasAttribute("coords")) {
      coords = area.getAttribute("coords");
    }

    if (units != null
	&& !units.equalsIgnoreCase("linecolumn")
	&& !units.equalsIgnoreCase("linerange")) {
      System.out.println("Only linecolumn and linerange units are supported");
      return;
    }

    if (coords == null) {
      System.out.println("Coords must be specified");
      return;
    }

    // Now let's see if we can interpret the coordinates...
    StringTokenizer st = new StringTokenizer(coords);
    int tokenCount = 0;
    int c1 = 0;
    int c2 = 0;
    while (st.hasMoreTokens()) {
      tokenCount++;
      if (tokenCount > 2) {
	System.out.println("Unparseable coordinates");
	return;
      }
      try {
	String token = st.nextToken();
	int coord = Integer.parseInt(token);
	c2 = coord;
	if (tokenCount == 1) {
	  c1 = coord;
	}
      } catch (NumberFormatException e) {
	System.out.println("Unparseable coordinate");
	return;
      }
    }

    // Make sure we aren't going to blow past the end of our array
    if (calloutCount == callout.length) {
      Callout bigger[] = new Callout[calloutCount+10];
      for (int count = 0; count < callout.length; count++) {
	bigger[count] = callout[count];
      }
      callout = bigger;
    }

    // Ok, add the callout
    if (tokenCount == 2) {
      if (units != null && units.equalsIgnoreCase("linerange")) {
	for (int count = c1; count <= c2; count++) {
	  callout[calloutCount++] = new Callout(coNum, area,
						count, defaultColumn);
	}
      } else {
	// assume linecolumn
	callout[calloutCount++] = new Callout(coNum, area, c1, c2);
      }
    } else {
      // if there's only one number, assume it's the line
      callout[calloutCount++] = new Callout(coNum, area, c1, defaultColumn);
    }
  }

  /** Process end element events. */
  public void endElement(int nameCode)
    throws TransformerException {

    if (!elementStack.empty()) {
      // if we didn't push the very first element (an fo:block or
      // pre or div surrounding the whole block), then the stack will
      // be empty when we get to the end of the first element...
      elementStack.pop();
    }
    rtfEmitter.endElement(nameCode);
  }

  /** Process start element events. */
  public void startElement(int nameCode,
			   org.xml.sax.Attributes attributes,
			   int[] namespaces,
			   int nscount)
    throws TransformerException {

    if (!skipThisElement(nameCode)) {
      StartElementInfo sei = new StartElementInfo(nameCode, attributes,
						  namespaces, nscount);
      elementStack.push(sei);
    }

    firstElement = false;

    rtfEmitter.startElement(nameCode, attributes, namespaces, nscount);
  }

  /**
   * <p>Protect the outer-most block wrapper.</p>
   *
   * <p>Open elements in the result tree fragment are closed and reopened
   * around callouts (so that callouts don't appear inside links or other
   * environments). But if the result tree fragment is a single block
   * (a div or pre in HTML, an fo:block in FO), that outer-most block is
   * treated specially.</p>
   *
   * <p>This method returns true if the element in question is that
   * outermost block.</p>
   *
   * @param nameCode The name code for the element
   *
   * @return True if the element is the outer-most block, false otherwise.
   */
  protected boolean skipThisElement(int nameCode) {
    // FIXME: This is such a gross hack...
    if (firstElement) {
      int thisFingerprint    = namePool.getFingerprint(nameCode);
      int foBlockFingerprint = namePool.getFingerprint(foURI, "block");
      int htmlPreFingerprint = namePool.getFingerprint("", "pre");
      int htmlDivFingerprint = namePool.getFingerprint("", "div");
      int xhtmlPreFingerprint = namePool.getFingerprint(xhURI, "pre");
      int xhtmlDivFingerprint = namePool.getFingerprint(xhURI, "div");

      if ((foStylesheet && thisFingerprint == foBlockFingerprint)
	  || (!foStylesheet && (thisFingerprint == htmlPreFingerprint
				|| thisFingerprint == htmlDivFingerprint
				|| thisFingerprint == xhtmlPreFingerprint
				|| thisFingerprint == xhtmlDivFingerprint))) {
	// Don't push the outer-most wrapping div, pre, or fo:block
	return true;
      }
    }

    return false;
  }

  private void closeOpenElements(Emitter rtfEmitter)
    throws TransformerException {
    // Close all the open elements...
    tempStack = new Stack();
    while (!elementStack.empty()) {
      StartElementInfo elem = (StartElementInfo) elementStack.pop();
      rtfEmitter.endElement(elem.getNameCode());
      tempStack.push(elem);
    }
  }

  private void openClosedElements(Emitter rtfEmitter)
    throws TransformerException {
    // Now "reopen" the elements that we closed...
    while (!tempStack.empty()) {
      StartElementInfo elem = (StartElementInfo) tempStack.pop();
      AttributeCollection attr = (AttributeCollection) elem.getAttributes();
      AttributeCollection newAttr = new AttributeCollection(namePool);

      for (int acount = 0; acount < attr.getLength(); acount++) {
	String localName = attr.getLocalName(acount);
	int nameCode = attr.getNameCode(acount);
	String type = attr.getType(acount);
	String value = attr.getValue(acount);
	String uri = attr.getURI(acount);
	String prefix = "";

	if (localName.indexOf(':') > 0) {
	  prefix = localName.substring(0, localName.indexOf(':'));
	  localName = localName.substring(localName.indexOf(':')+1);
	}

	if (uri.equals("")
	    && ((foStylesheet
		 && localName.equals("id"))
		|| (!foStylesheet
		    && (localName.equals("id")
			|| localName.equals("name"))))) {
	  // skip this attribute
	} else {
	  newAttr.addAttribute(prefix, uri, localName, type, value);
	}
      }

      rtfEmitter.startElement(elem.getNameCode(),
			      newAttr,
			      elem.getNamespaces(),
			      elem.getNSCount());

      elementStack.push(elem);
    }
  }

  /**
   * <p>A private class for maintaining the information required to call
   * the startElement method.</p>
   *
   * <p>In order to close and reopen elements, information about those
   * elements has to be maintained. This class is just the little record
   * that we push on the stack to keep track of that info.</p>
   */
  private class StartElementInfo {
    private int _nameCode;
    org.xml.sax.Attributes _attributes;
    int[] _namespaces;
    int _nscount;

    public StartElementInfo(int nameCode,
			    org.xml.sax.Attributes attributes,
			    int[] namespaces,
			    int nscount) {
      _nameCode = nameCode;
      _attributes = attributes;
      _namespaces = namespaces;
      _nscount = nscount;
    }

    public int getNameCode() {
      return _nameCode;
    }

    public org.xml.sax.Attributes getAttributes() {
      return _attributes;
    }

    public int[] getNamespaces() {
      return _namespaces;
    }

    public int getNSCount() {
      return _nscount;
    }
  }
}