import com.sun.org.apache.xml.internal.dtm.ref.DTMNodeIterator; //导入依赖的package包/类
/**
 * The exsl:object-type function returns a string giving the type of the object passed
 * as the argument. The possible object types are: 'string', 'number', 'boolean',
 * 'node-set', 'RTF', or 'external'.
 *
 * Most XSLT object types can be coerced to each other without error. However, there are
 * certain coercions that raise errors, most importantly treating anything other than a
 * node set as a node set. Authors of utilities such as named templates or user-defined
 * extension functions may wish to give some flexibility in the parameter and argument values
 * that are accepted by the utility; the exsl:object-type function enables them to do so.
 *
 * The Xalan extensions MethodResolver converts 'object-type' to 'objectType'.
 *
 * @param obj The object to be typed.
 * @return objectType 'string', 'number', 'boolean', 'node-set', 'RTF', or 'external'.
 *
 * @see <a href="http://www.exslt.org/">EXSLT</a>
 */
public static String objectType (Object obj)
{
  if (obj instanceof String)
    return "string";
  else if (obj instanceof Boolean)
    return "boolean";
  else if (obj instanceof Number)
    return "number";
  else if (obj instanceof DTMNodeIterator)
  {
    DTMIterator dtmI = ((DTMNodeIterator)obj).getDTMIterator();
    if (dtmI instanceof com.sun.org.apache.xpath.internal.axes.RTFIterator)
      return "RTF";
    else
      return "node-set";
  }
  else
    return "unknown";
}