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.SerializationHandler;
  import org.apache.xml.utils.QName;
  import org.apache.xml.utils.XML11Char;
  import org.apache.xpath.XPathContext;
  import org.xml.sax.SAXException;
  
  /**
   * Implement xsl:element
   * <pre>
   * <!ELEMENT xsl:element %template;>
   * <!ATTLIST xsl:element
   *   name %avt; #REQUIRED
   *   namespace %avt; #IMPLIED
   *   use-attribute-sets %qnames; #IMPLIED
   *   %space-att;
   * >
   * </pre>
   * @see <a href="http://www.w3.org/TR/xslt#section-Creating-Elements-with-xsl:element">XXX in XSLT Specification</a>
   * @xsl.usage advanced
   */
  public class ElemElement extends ElemUse
  {
      static final long serialVersionUID = -324619535592435183L;
  
    /**
     * The name attribute is interpreted as an attribute value template.
     * It is an error if the string that results from instantiating the
     * attribute value template is not a QName.
     * @serial
     */
    protected AVT m_name_avt = null;
  
    /**
     * Set the "name" attribute.
     * The name attribute is interpreted as an attribute value template.
     * It is an error if the string that results from instantiating the
     * attribute value template is not a QName.
     *
     * @param v Name attribute to set for this element
     */
    public void setName(AVT v)
    {
      m_name_avt = v;
    }
  
    /**
     * Get the "name" attribute.
     * The name attribute is interpreted as an attribute value template.
     * It is an error if the string that results from instantiating the
     * attribute value template is not a QName.
     *
     * @return Name attribute for this element
     */
    public AVT getName()
    {
      return m_name_avt;
    }
  
    /**
     * If the namespace attribute is present, then it also is interpreted
     * as an attribute value template. The string that results from
     * instantiating the attribute value template should be a URI reference.
     * It is not an error if the string is not a syntactically legal URI reference.
     * @serial
     */
    protected AVT m_namespace_avt = null;
  
    /**
     * Set the "namespace" attribute.
     * If the namespace attribute is present, then it also is interpreted
     * as an attribute value template. The string that results from
     * instantiating the attribute value template should be a URI reference.
     * It is not an error if the string is not a syntactically legal URI reference.
     *
     * @param v NameSpace attribute to set for this element
     */
    public void setNamespace(AVT v)
    {
      m_namespace_avt = v;
    }
  
    /**
     * Get the "namespace" attribute.
     * If the namespace attribute is present, then it also is interpreted
     * as an attribute value template. The string that results from
     * instantiating the attribute value template should be a URI reference.
     * It is not an error if the string is not a syntactically legal URI reference.
     *
     * @return Namespace attribute for this element
     */
    public AVT getNamespace()
    {
      return m_namespace_avt;
    }
    
    /**
     * This function is called after everything else has been
     * recomposed, and allows the template to set remaining
     * values that may be based on some other property that
     * depends on recomposition.
     */
    public void compose(StylesheetRoot sroot) throws TransformerException
    {
      super.compose(sroot);
      
      StylesheetRoot.ComposeState cstate = sroot.getComposeState();
      java.util.Vector vnames = cstate.getVariableNames();
      if(null != m_name_avt)
        m_name_avt.fixupVariables(vnames, cstate.getGlobalsSize());
      if(null != m_namespace_avt)
        m_namespace_avt.fixupVariables(vnames, cstate.getGlobalsSize());
    }
  
  
    /**
     * 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_ELEMENT;
    }
  
    /**
     * Return the node name.
     *
     * @return This element's name 
     */
    public String getNodeName()
    {
      return Constants.ELEMNAME_ELEMENT_STRING;
    }
     
    /**
     * Resolve the namespace into a prefix.  Meant to be
     * overidded by elemAttribute if this class is derived.
     *
     * @param rhandler The current result tree handler.
     * @param prefix The probable prefix if already known.
     * @param nodeNamespace  The namespace.
     *
     * @return The prefix to be used.
     */
    protected String resolvePrefix(SerializationHandler rhandler,
                                   String prefix, String nodeNamespace)
      throws TransformerException
    {
  
  //    if (null != prefix && prefix.length() == 0)
  //    {
  //      String foundPrefix = rhandler.getPrefix(nodeNamespace);
  //
  //      // System.out.println("nsPrefix: "+nsPrefix);           
  //      if (null == foundPrefix)
  //        foundPrefix = "";
  //    }
      return prefix;
    }
      
    /**
     * Create an element in the result tree.
     * The xsl:element element allows an element to be created with a
     * computed name. The expanded-name of the element to be created
     * is specified by a required name attribute and an optional namespace
     * attribute. The content of the xsl:element element is a template
     * for the attributes and children of the created element.
     *
     * @param transformer non-null reference to the the current transform-time state.
     *
     * @throws TransformerException
     */
    public void execute(
            TransformerImpl transformer)
              throws TransformerException
    {
  
         if (transformer.getDebug())
           transformer.getTraceManager().fireTraceEvent(this);
  
   	SerializationHandler rhandler = transformer.getSerializationHandler();
      XPathContext xctxt = transformer.getXPathContext();
      int sourceNode = xctxt.getCurrentNode();
      
      
      String nodeName = m_name_avt == null ? null : m_name_avt.evaluate(xctxt, sourceNode, this);
  
      String prefix = null;
      String nodeNamespace = "";
  
      // Only validate if an AVT was used.
      if ((nodeName != null) && (!m_name_avt.isSimple()) && (!XML11Char.isXML11ValidQName(nodeName)))
      {
        transformer.getMsgMgr().warn(
          this, XSLTErrorResources.WG_ILLEGAL_ATTRIBUTE_VALUE,
          new Object[]{ Constants.ATTRNAME_NAME, nodeName });
  
        nodeName = null;
      }
  
      else if (nodeName != null)
      {
        prefix = QName.getPrefixPart(nodeName);
  
        if (null != m_namespace_avt)
        {
          nodeNamespace = m_namespace_avt.evaluate(xctxt, sourceNode, this);
          if (null == nodeNamespace || 
              (prefix != null && prefix.length()>0 && nodeNamespace.length()== 0) )
            transformer.getMsgMgr().error(
                this, XSLTErrorResources.ER_NULL_URI_NAMESPACE);
          else
          {
          // Determine the actual prefix that we will use for this nodeNamespace
  
          prefix = resolvePrefix(rhandler, prefix, nodeNamespace);
          if (null == prefix)
            prefix = "";
  
          if (prefix.length() > 0)
            nodeName = (prefix + ":" + QName.getLocalPart(nodeName));
          else
            nodeName = QName.getLocalPart(nodeName);
          }
        }
  
        // No namespace attribute was supplied. Use the namespace declarations
        // currently in effect for the xsl:element element.
        else    
        {
          try
          {
            // Maybe temporary, until I get this worked out.  test: axes59
            nodeNamespace = getNamespaceForPrefix(prefix);
  
            // If we get back a null nodeNamespace, that means that this prefix could
            // not be found in the table.  This is okay only for a default namespace
            // that has never been declared.
  
            if ( (null == nodeNamespace) && (prefix.length() == 0) )
              nodeNamespace = "";
            else if (null == nodeNamespace)
            {
              transformer.getMsgMgr().warn(
                this, XSLTErrorResources.WG_COULD_NOT_RESOLVE_PREFIX,
                new Object[]{ prefix });
  
              nodeName = null;
            }
  
          }
          catch (Exception ex)
          {
            transformer.getMsgMgr().warn(
              this, XSLTErrorResources.WG_COULD_NOT_RESOLVE_PREFIX,
              new Object[]{ prefix });
  
            nodeName = null;
          }
        }
      }
  
      constructNode(nodeName, prefix, nodeNamespace, transformer);
  
      if (transformer.getDebug())
        transformer.getTraceManager().fireTraceEndEvent(this);
    }
    
    /**
     * Construct a node in the result tree.  This method is overloaded by 
     * xsl:attribute. At this class level, this method creates an element.
     * If the node is null, we instantiate only the content of the node in accordance
     * with section 7.1.2 of the XSLT 1.0 Recommendation.
     *
     * @param nodeName The name of the node, which may be <code>null</code>.  If <code>null</code>,
     *                 only the non-attribute children of this node will be processed.
     * @param prefix The prefix for the namespace, which may be <code>null</code>.
     *               If not <code>null</code>, this prefix will be mapped and unmapped.
     * @param nodeNamespace The namespace of the node, which may be not be <code>null</code>.
     * @param transformer non-null reference to the the current transform-time state.
     *
     * @throws TransformerException
     */
    void constructNode(
            String nodeName, String prefix, String nodeNamespace, TransformerImpl transformer)
              throws TransformerException
    {
  
      boolean shouldAddAttrs;
  
      try
      {
        SerializationHandler rhandler = transformer.getResultTreeHandler();
  
        if (null == nodeName)
        {
          shouldAddAttrs = false;
        }
        else
        {
          if (null != prefix)
          {
            rhandler.startPrefixMapping(prefix, nodeNamespace, true);
          }
  
          rhandler.startElement(nodeNamespace, QName.getLocalPart(nodeName),
                                nodeName);
  
          super.execute(transformer);
  
          shouldAddAttrs = true;
        }
  
        transformer.executeChildTemplates(this, shouldAddAttrs);
  
        // Now end the element if name was valid
        if (null != nodeName)
        {
          rhandler.endElement(nodeNamespace, QName.getLocalPart(nodeName),
                              nodeName);
          if (null != prefix)
          {
            rhandler.endPrefixMapping(prefix);
          }
        }
      }
      catch (SAXException se)
      {
        throw new TransformerException(se);
      }
    }
    
    /**
     * Call the children visitors.
     * @param visitor The visitor whose appropriate method will be called.
     */
    protected void callChildVisitors(XSLTVisitor visitor, boolean callAttrs)
    {
    	if(callAttrs)
    	{
    	  if(null != m_name_avt)
    		m_name_avt.callVisitors(visitor);
    		
    	  if(null != m_namespace_avt)
    		m_namespace_avt.callVisitors(visitor);
    	}
    		
      super.callChildVisitors(visitor, callAttrs);
    }
  
  }
  