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.dtm.DTM;
  
  /**
   * Implement xsl:apply-imports.
   * <pre>
   * <!ELEMENT xsl:apply-imports EMPTY>
   * </pre>
   * @see <a href="http://www.w3.org/TR/xslt#apply-imports">apply-imports in XSLT Specification</a>
   * @xsl.usage advanced
   */
  public class ElemApplyImport extends ElemTemplateElement
  {
      static final long serialVersionUID = 3764728663373024038L;
  
    /**
     * Get an int constant identifying the type of element.
     * @see org.apache.xalan.templates.Constants
     *
     * @return Token ID for xsl:apply-imports element types
     */
    public int getXSLToken()
    {
      return Constants.ELEMNAME_APPLY_IMPORTS;
    }
  
    /**
     * Return the node name.
     *
     * @return Element name
     */
    public String getNodeName()
    {
      return Constants.ELEMNAME_APPLY_IMPORTS_STRING;
    }
  
    /**
     * Execute the xsl:apply-imports transformation.
     *
     * @param transformer non-null reference to the the current transform-time state.
     *
     * @throws TransformerException
     */
    public void execute(
            TransformerImpl transformer)
              throws TransformerException
    {
  
      if (transformer.currentTemplateRuleIsNull())
      {
        transformer.getMsgMgr().error(this,
          XSLTErrorResources.ER_NO_APPLY_IMPORT_IN_FOR_EACH);  //"xsl:apply-imports not allowed in a xsl:for-each");
      }
  
      if (transformer.getDebug())
        transformer.getTraceManager().fireTraceEvent(this);
  
      int sourceNode = transformer.getXPathContext().getCurrentNode();
      if (DTM.NULL != sourceNode)
      {
        // supply the current templated (matched, not named)        
        ElemTemplate matchTemplate = transformer.getMatchedTemplate();
        transformer.applyTemplateToNode(this, matchTemplate, sourceNode);
      }
      else  // if(null == sourceNode)
      {
        transformer.getMsgMgr().error(this,
          XSLTErrorResources.ER_NULL_SOURCENODE_APPLYIMPORTS);  //"sourceNode is null in xsl:apply-imports!");
      }
      if (transformer.getDebug())
        transformer.getTraceManager().fireTraceEndEvent(this);
    }
  
    /**
     * Add a child to the child list.
     * <!ELEMENT xsl:apply-imports EMPTY>
     *
     * @param newChild New element to append to this element's children list
     *
     * @return null, xsl:apply-Imports cannot have children 
     */
    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;
    }
  }
  