src/org/apache/xpath/objects/XObjectFactory.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.xpath.objects;

import org.apache.xml.dtm.*;
import org.apache.xpath.XPathContext;
import org.apache.xpath.NodeSetDTM;
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;
  }
}