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.xalan.transformer.TreeWalker2Result;
  import org.apache.xml.dtm.DTM;
  import org.apache.xml.dtm.DTMIterator;
  import org.apache.xml.dtm.ref.DTMTreeWalker;
  import org.apache.xalan.serialize.SerializerUtils;
  import org.apache.xml.serializer.SerializationHandler;
  import org.apache.xpath.XPath;
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XObject;
  
  /**
   * Implement xsl:copy-of.
   * <pre>
   * <!ELEMENT xsl:copy-of EMPTY>
   * <!ATTLIST xsl:copy-of select %expr; #REQUIRED>
   * </pre>
   * @see <a href="http://www.w3.org/TR/xslt#copy-of">copy-of in XSLT Specification</a>
   * @xsl.usage advanced
   */
  public class ElemCopyOf extends ElemTemplateElement
  {
      static final long serialVersionUID = -7433828829497411127L;
  
    /**
     * The required select attribute contains an expression.
     * @serial
     */
    public XPath m_selectExpression = null;
  
    /**
     * Set the "select" attribute.
     * The required select attribute contains an expression.
     *
     * @param expr Expression for select attribute 
     */
    public void setSelect(XPath expr)
    {
      m_selectExpression = expr;
    }
  
    /**
     * Get the "select" attribute.
     * The required select attribute contains an expression.
     *
     * @return Expression for select attribute 
     */
    public XPath getSelect()
    {
      return m_selectExpression;
    }
    
    /**
     * 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();
      m_selectExpression.fixupVariables(cstate.getVariableNames(), 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_COPY_OF;
    }
  
    /**
     * Return the node name.
     *
     * @return The element's name
     */
    public String getNodeName()
    {
      return Constants.ELEMNAME_COPY_OF_STRING;
    }
  
    /**
     * The xsl:copy-of element can be used to insert a result tree
     * fragment into the result tree, without first converting it to
     * a string as xsl:value-of does (see [7.6.1 Generating Text with
     * xsl:value-of]).
     *
     * @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);
  
      try
      {
        XPathContext xctxt = transformer.getXPathContext();
        int sourceNode = xctxt.getCurrentNode();
        XObject value = m_selectExpression.execute(xctxt, sourceNode, this);
  
        if (transformer.getDebug())
          transformer.getTraceManager().fireSelectedEvent(sourceNode, this,
                                                          "select", m_selectExpression, value);
  
        SerializationHandler handler = transformer.getSerializationHandler();
  
        if (null != value)
                          {
          int type = value.getType();
          String s;
  
          switch (type)
          {
          case XObject.CLASS_BOOLEAN :
          case XObject.CLASS_NUMBER :
          case XObject.CLASS_STRING :
            s = value.str();
  
            handler.characters(s.toCharArray(), 0, s.length());
            break;
          case XObject.CLASS_NODESET :
  
            // System.out.println(value);
            DTMIterator nl = value.iter();
  
            // Copy the tree.
            DTMTreeWalker tw = new TreeWalker2Result(transformer, handler);
            int pos;
  
            while (DTM.NULL != (pos = nl.nextNode()))
            {
              DTM dtm = xctxt.getDTMManager().getDTM(pos);
              short t = dtm.getNodeType(pos);
  
              // If we just copy the whole document, a startDoc and endDoc get 
              // generated, so we need to only walk the child nodes.
              if (t == DTM.DOCUMENT_NODE)
              {
                for (int child = dtm.getFirstChild(pos); child != DTM.NULL;
                     child = dtm.getNextSibling(child))
                {
                  tw.traverse(child);
                }
              }
              else if (t == DTM.ATTRIBUTE_NODE)
              {
                SerializerUtils.addAttribute(handler, pos);
              }
              else
              {
                tw.traverse(pos);
              }
            }
            // nl.detach();
            break;
          case XObject.CLASS_RTREEFRAG :
            SerializerUtils.outputResultTreeFragment(
              handler, value, transformer.getXPathContext());
            break;
          default :
            
            s = value.str();
  
            handler.characters(s.toCharArray(), 0, s.length());
            break;
          }
        }
                          
        // I don't think we want this.  -sb
        //  if (transformer.getDebug())
        //  transformer.getTraceManager().fireSelectedEvent(sourceNode, this,
        //  "endSelect", m_selectExpression, value);
  
      }
      catch(org.xml.sax.SAXException se)
      {
        throw new TransformerException(se);
      }
      finally
      {
        if (transformer.getDebug())
          transformer.getTraceManager().fireTraceEndEvent(this);
      }
  
    }
  
    /**
     * Add a child to the child list.
     *
     * @param newChild Child to add to this node's child list
     *
     * @return Child just added to child list
     */
    public ElemTemplateElement appendChild(ElemTemplateElement newChild)
    {
  
      error(XSLTErrorResources.ER_CANNOT_ADD,
            new Object[]{ newChild.getNodeName(),
                          this.getNodeName() });  //"Can not add " +((ElemTemplateElement)newChild).m_elemName +
  
      //" to " + this.m_elemName);
      return null;
    }
    
    /**
     * Call the children visitors.
     * @param visitor The visitor whose appropriate method will be called.
     */
    protected void callChildVisitors(XSLTVisitor visitor, boolean callAttrs)
    {
    	if(callAttrs)
    		m_selectExpression.getExpression().callVisitors(m_selectExpression, visitor);
      super.callChildVisitors(visitor, callAttrs);
    }
  
  }
  