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.xpath.XPathContext;
  import org.apache.xpath.objects.XObject;
  
  /**
   * Implement xsl:choose.
   * <pre>
   * <!ELEMENT xsl:choose (xsl:when+, xsl:otherwise?)>
   * <!ATTLIST xsl:choose %space-att;>
   * </pre>
   * @see <a href="http://www.w3.org/TR/xslt#section-Conditional-Processing-with-xsl:choose">XXX in XSLT Specification</a>
   * @xsl.usage advanced
   */
  public class ElemChoose extends ElemTemplateElement
  {
      static final long serialVersionUID = -3070117361903102033L;
  
    /**
     * 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_CHOOSE;
    }
  
    /**
     * Return the node name.
     *
     * @return The element's name
     */
    public String getNodeName()
    {
      return Constants.ELEMNAME_CHOOSE_STRING;
    }
  
    /**
     * Constructor ElemChoose
     *
     */
    public ElemChoose(){}
  
    /**
     * Execute the xsl:choose transformation.
     *
     *
     * @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);
  
      boolean found = false;
  
      for (ElemTemplateElement childElem = getFirstChildElem();
              childElem != null; childElem = childElem.getNextSiblingElem())
      {
        int type = childElem.getXSLToken();
  
        if (Constants.ELEMNAME_WHEN == type)
        {
          found = true;
  
          ElemWhen when = (ElemWhen) childElem;
  
          // must be xsl:when
          XPathContext xctxt = transformer.getXPathContext();
          int sourceNode = xctxt.getCurrentNode();
          
          // System.err.println("\""+when.getTest().getPatternString()+"\"");
          
          // if(when.getTest().getPatternString().equals("COLLECTION/icuser/ictimezone/LITERAL='GMT +13:00 Pacific/Tongatapu'"))
          // 	System.err.println("Found COLLECTION/icuser/ictimezone/LITERAL");
  
          if (transformer.getDebug())
          {
            XObject test = when.getTest().execute(xctxt, sourceNode, when);
  
            if (transformer.getDebug())
              transformer.getTraceManager().fireSelectedEvent(sourceNode, when,
                      "test", when.getTest(), test);
  
            if (test.bool())
            {
              transformer.getTraceManager().fireTraceEvent(when);
              
              transformer.executeChildTemplates(when, true);
  
  	        transformer.getTraceManager().fireTraceEndEvent(when); 
  	                  
              return;
            }
  
          }
          else if (when.getTest().bool(xctxt, sourceNode, when))
          {
            transformer.executeChildTemplates(when, true);
  
            return;
          }
        }
        else if (Constants.ELEMNAME_OTHERWISE == type)
        {
          found = true;
  
          if (transformer.getDebug())
            transformer.getTraceManager().fireTraceEvent(childElem);
  
          // xsl:otherwise                
          transformer.executeChildTemplates(childElem, true);
  
          if (transformer.getDebug())
  	      transformer.getTraceManager().fireTraceEndEvent(childElem); 
          return;
        }
      }
  
      if (!found)
        transformer.getMsgMgr().error(
          this, XSLTErrorResources.ER_CHOOSE_REQUIRES_WHEN);
          
      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 The child that was just added to the child list
     *
     * @throws DOMException
     */
    public ElemTemplateElement appendChild(ElemTemplateElement newChild)
    {
  
      int type = ((ElemTemplateElement) newChild).getXSLToken();
  
      switch (type)
      {
      case Constants.ELEMNAME_WHEN :
      case Constants.ELEMNAME_OTHERWISE :
  
        // TODO: Positional checking
        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);
    }
    
    /**
     * Tell if this element can accept variable declarations.
     * @return true if the element can accept and process variable declarations.
     */
    public boolean canAcceptVariables()
    {
    	return false;
    }
  
  }
  