/*
 * 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: XObjectFactory.java 468655 2006-10-28 07:12:06Z minchau $
 */
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.
Params:
val – The java object which this object will wrap.
Returns:
the right XObject based on the type of the object passed./**
   * 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 can make an XObject that exposes DOM Nodes, NodeLists, and 
NodeIterators to the XSLT stylesheet as node-sets.
Params:
val – The java object which this object will wrap.
xctxt – The XPath context.
Returns:
the right XObject based on the type of the object passed./**
   * 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;
  }
}