code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the  "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id$
   */
  package org.apache.xalan.templates;
  
  import javax.xml.transform.TransformerException;
  
  import org.apache.xalan.res.XSLTErrorResources;
  import org.apache.xalan.transformer.TransformerImpl;
  import org.apache.xml.serializer.NamespaceMappings;
  import org.apache.xml.serializer.SerializationHandler;
  import org.apache.xml.utils.QName;
  import org.apache.xml.utils.XML11Char;
  
  import org.xml.sax.SAXException;
  
  /**
   * Implement xsl:attribute.
   * <pre>
   * &amp;!ELEMENT xsl:attribute %char-template;>
   * &amp;!ATTLIST xsl:attribute
   *   name %avt; #REQUIRED
   *   namespace %avt; #IMPLIED
   *   %space-att;
   * &amp;
   * </pre>
   * @see <a href="http://www.w3.org/TR/xslt#creating-attributes">creating-attributes in XSLT Specification</a>
   * @xsl.usage advanced
   */
  public class ElemAttribute extends ElemElement
  {
      static final long serialVersionUID = 8817220961566919187L;
  
    /**
     * Get an int constant identifying the type of element.
     * @see org.apache.xalan.templates.Constants
     *
     * @return The token ID for this element
     */
    public int getXSLToken()
    {
      return Constants.ELEMNAME_ATTRIBUTE;
    }
  
    /**
     * Return the node name.
     *
     * @return The element name 
     */
    public String getNodeName()
    {
      return Constants.ELEMNAME_ATTRIBUTE_STRING;
    }
  
    /**
     * Create an attribute in the result tree.
     * @see <a href="http://www.w3.org/TR/xslt#creating-attributes">creating-attributes in XSLT Specification</a>
     *
     * @param transformer non-null reference to the the current transform-time state.
     *
     * @throws TransformerException
     */
  //  public void execute(
  //          TransformerImpl transformer)
  //            throws TransformerException
  //  {
      //SerializationHandler rhandler = transformer.getSerializationHandler();
  
      // If they are trying to add an attribute when there isn't an 
      // element pending, it is an error.
      // I don't think we need this check here because it is checked in 
      // ResultTreeHandler.addAttribute.  (is)
  //    if (!rhandler.isElementPending())
  //    {
  //      // Make sure the trace event is sent.
  //      if (TransformerImpl.S_DEBUG)
  //        transformer.getTraceManager().fireTraceEvent(this);
  //
  //      XPathContext xctxt = transformer.getXPathContext();
  //      int sourceNode = xctxt.getCurrentNode();
  //      String attrName = m_name_avt.evaluate(xctxt, sourceNode, this);
  //      transformer.getMsgMgr().warn(this,
  //                                   XSLTErrorResources.WG_ILLEGAL_ATTRIBUTE_POSITION,
  //                                   new Object[]{ attrName });
  //
  //      if (TransformerImpl.S_DEBUG)
  //        transformer.getTraceManager().fireTraceEndEvent(this);
  //      return;
  //
  //      // warn(templateChild, sourceNode, "Trying to add attribute after element child has been added, ignoring...");
  //    }
      
  //    super.execute(transformer);
      
  //  }
    
    /**
     * Resolve the namespace into a prefix.  At this level, if no prefix exists, 
     * then return a manufactured prefix.
     *
     * @param rhandler The current result tree handler.
     * @param prefix The probable prefix if already known.
     * @param nodeNamespace  The namespace, which should not be null.
     *
     * @return The prefix to be used.
     */
    protected String resolvePrefix(SerializationHandler rhandler,
                                   String prefix, String nodeNamespace)
      throws TransformerException
    {
  
      if (null != prefix && (prefix.length() == 0 || prefix.equals("xmlns")))
      {
        // Since we can't use default namespace, in this case we try and 
        // see if a prefix has already been defined or this namespace.
        prefix = rhandler.getPrefix(nodeNamespace);
  
        // System.out.println("nsPrefix: "+nsPrefix);           
        if (null == prefix || prefix.length() == 0 || prefix.equals("xmlns"))
        {
          if(nodeNamespace.length() > 0)
          {
              NamespaceMappings prefixMapping = rhandler.getNamespaceMappings();
              prefix = prefixMapping.generateNextPrefix();
          }
          else
            prefix = "";
        }
      }
      return prefix;
    }
    
    /**
     * Validate that the node name is good.
     * 
     * @param nodeName Name of the node being constructed, which may be null.
     * 
     * @return true if the node name is valid, false otherwise.
     */
     protected boolean validateNodeName(String nodeName)
     {
        if(null == nodeName)
          return false;
        if(nodeName.equals("xmlns"))
          return false;
        return XML11Char.isXML11ValidQName(nodeName);
     }
    
    /**
     * Construct a node in the result tree.  This method is overloaded by 
     * xsl:attribute. At this class level, this method creates an element.
     *
     * @param nodeName The name of the node, which may be null.
     * @param prefix The prefix for the namespace, which may be null.
     * @param nodeNamespace The namespace of the node, which may be null.
     * @param transformer non-null reference to the the current transform-time state.
     * @param sourceNode non-null reference to the <a href="http://www.w3.org/TR/xslt#dt-current-node">current source node</a>.
     * @param mode reference, which may be null, to the <a href="http://www.w3.org/TR/xslt#modes">current mode</a>.
     *
     * @throws TransformerException
     */
    void constructNode(
            String nodeName, String prefix, String nodeNamespace, TransformerImpl transformer)
              throws TransformerException
    {
  
      if(null != nodeName && nodeName.length() > 0)
      {
        SerializationHandler rhandler = transformer.getSerializationHandler();
  
        // Evaluate the value of this attribute
        String val = transformer.transformToString(this);
        try 
        {
          // Let the result tree handler add the attribute and its String value.
          String localName = QName.getLocalPart(nodeName);
          if(prefix != null && prefix.length() > 0){
              rhandler.addAttribute(nodeNamespace, localName, nodeName, "CDATA", val, true);
          }else{
              rhandler.addAttribute("", localName, nodeName, "CDATA", val, true);
          }
        }
        catch (SAXException e)
        {
        }
      }
    }
  
  
    /**
     * Add a child to the child list.
     * <!ELEMENT xsl:attribute %char-template;>
     * <!ATTLIST xsl:attribute
     *   name %avt; #REQUIRED
     *   namespace %avt; #IMPLIED
     *   %space-att;
     * >
     *
     * @param newChild Child to append to the list of this node's children
     *
     * @return The node we just appended to the children list 
     *
     * @throws DOMException
     */
    public ElemTemplateElement appendChild(ElemTemplateElement newChild)
    {
  
      int type = ((ElemTemplateElement) newChild).getXSLToken();
  
      switch (type)
      {
  
      // char-instructions 
      case Constants.ELEMNAME_TEXTLITERALRESULT :
      case Constants.ELEMNAME_APPLY_TEMPLATES :
      case Constants.ELEMNAME_APPLY_IMPORTS :
      case Constants.ELEMNAME_CALLTEMPLATE :
      case Constants.ELEMNAME_FOREACH :
      case Constants.ELEMNAME_VALUEOF :
      case Constants.ELEMNAME_COPY_OF :
      case Constants.ELEMNAME_NUMBER :
      case Constants.ELEMNAME_CHOOSE :
      case Constants.ELEMNAME_IF :
      case Constants.ELEMNAME_TEXT :
      case Constants.ELEMNAME_COPY :
      case Constants.ELEMNAME_VARIABLE :
      case Constants.ELEMNAME_MESSAGE :
  
        // instructions 
        // case Constants.ELEMNAME_PI:
        // case Constants.ELEMNAME_COMMENT:
        // case Constants.ELEMNAME_ELEMENT:
        // case Constants.ELEMNAME_ATTRIBUTE:
        break;
      default :
        error(XSLTErrorResources.ER_CANNOT_ADD,
              new Object[]{ newChild.getNodeName(),
                            this.getNodeName() });  //"Can not add " +((ElemTemplateElement)newChild).m_elemName +
  
      //" to " + this.m_elemName);
      }
  
      return super.appendChild(newChild);
    }
  	/**
  	 * @see ElemElement#setName(AVT)
  	 */
  	public void setName(AVT v) {
          if (v.isSimple())
          {
              if (v.getSimpleString().equals("xmlns"))
              {
                  throw new IllegalArgumentException();
              }
          }
  		super.setName(v);
  	}
  
  }
  