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.xpath.objects;
  
  import org.apache.xml.dtm.Axis;
  import org.apache.xml.dtm.DTM;
  import org.apache.xml.dtm.DTMAxisIterator;
  import org.apache.xml.dtm.DTMIterator;
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.axes.OneStepIterator;
  
  
  public class XObjectFactory
  {
    
    /**
     * Create the right XObject based on the type of the object passed.  This 
     * function can not make an XObject that exposes DOM Nodes, NodeLists, and 
     * NodeIterators to the XSLT stylesheet as node-sets.
     *
     * @param val The java object which this object will wrap.
     *
     * @return the right XObject based on the type of the object passed.
     */
    static public XObject create(Object val)
    {
  
      XObject result;
  
      if (val instanceof XObject)
      {
        result = (XObject) val;
      }
      else if (val instanceof String)
      {
        result = new XString((String) val);
      }
      else if (val instanceof Boolean)
      {
        result = new XBoolean((Boolean)val);
      }
      else if (val instanceof Double)
      {
        result = new XNumber(((Double) val));
      }
      else
      {
        result = new XObject(val);
      }
  
      return result;
    }
    
    /**
     * Create the right XObject based on the type of the object passed.
     * This function <emph>can</emph> make an XObject that exposes DOM Nodes, NodeLists, and 
     * NodeIterators to the XSLT stylesheet as node-sets.
     *
     * @param val The java object which this object will wrap.
     * @param xctxt The XPath context.
     *
     * @return the right XObject based on the type of the object passed.
     */
    static public XObject create(Object val, XPathContext xctxt)
    {
  
      XObject result;
  
      if (val instanceof XObject)
      {
        result = (XObject) val;
      }
      else if (val instanceof String)
      {
        result = new XString((String) val);
      }
      else if (val instanceof Boolean)
      {
        result = new XBoolean((Boolean)val);
      }
      else if (val instanceof Number)
      {
        result = new XNumber(((Number) val));
      }
      else if (val instanceof DTM)
      {
        DTM dtm = (DTM)val;
        try
        {
          int dtmRoot = dtm.getDocument();
          DTMAxisIterator iter = dtm.getAxisIterator(Axis.SELF);
          iter.setStartNode(dtmRoot);
          DTMIterator iterator = new OneStepIterator(iter, Axis.SELF);
          iterator.setRoot(dtmRoot, xctxt);
          result = new XNodeSet(iterator);
        }
        catch(Exception ex)
        {
          throw new org.apache.xml.utils.WrappedRuntimeException(ex);
        }
      }
      else if (val instanceof DTMAxisIterator)
      {
        DTMAxisIterator iter = (DTMAxisIterator)val;
        try
        {
          DTMIterator iterator = new OneStepIterator(iter, Axis.SELF);
          iterator.setRoot(iter.getStartNode(), xctxt);
          result = new XNodeSet(iterator);
        }
        catch(Exception ex)
        {
          throw new org.apache.xml.utils.WrappedRuntimeException(ex);
        }
      }
      else if (val instanceof DTMIterator)
      {
        result = new XNodeSet((DTMIterator) val);
      }
      // This next three instanceofs are a little worrysome, since a NodeList 
      // might also implement a Node!
      else if (val instanceof org.w3c.dom.Node)
      {
        result = new XNodeSetForDOM((org.w3c.dom.Node)val, xctxt);
      }
      // This must come after org.w3c.dom.Node, since many Node implementations 
      // also implement NodeList.
      else if (val instanceof org.w3c.dom.NodeList)
      {
        result = new XNodeSetForDOM((org.w3c.dom.NodeList)val, xctxt);
      }
      else if (val instanceof org.w3c.dom.traversal.NodeIterator)
      {
        result = new XNodeSetForDOM((org.w3c.dom.traversal.NodeIterator)val, xctxt);
      }
      else
      {
        result = new XObject(val);
      }
  
      return result;
    }
  }
  