xalan/serializer/2.7.2 : org/apache/xpath/NodeSetDTM.java

NodeSetDTM
http://xml.apache.org/xalan-j/: Serializer to write out XML, HTML etc. as a stream of characters from an input DOM or from input SAX events. (The Apache Software Foundation)
The Apache Software License, Version 2.0
/*
 * 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: NodeSetDTM.java 468655 2006-10-28 07:12:06Z minchau $
 */
package org.apache.xpath;

import org.apache.xalan.res.XSLMessages;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMFilter;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.dtm.DTMManager;
import org.apache.xml.utils.NodeVector;
import org.apache.xpath.res.XPATHErrorResources;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.traversal.NodeIterator;


The NodeSetDTM class can act as either a NodeVector,
NodeList, or NodeIterator.  However, in order for it to
act as a NodeVector or NodeList, it's required that
setShouldCacheNodes(true) be called before the first
nextNode() is called, in order that nodes can be added
as they are fetched.  Derived classes that implement iterators
must override runTo(int index), in order that they may
run the iteration to the given index. 
Note that we directly implement the DOM's NodeIterator
interface. We do not emulate all the behavior of the
standard NodeIterator. In particular, we do not guarantee
to present a "live view" of the document ... but in XSLT,
the source document should never be mutated, so this should
never be an issue.
Thought: Should NodeSetDTM really implement NodeList and NodeIterator,
or should there be specific subclasses of it which do so? The
advantage of doing it all here is that all NodeSetDTMs will respond
to the same calls; the disadvantage is that some of them may return
less-than-enlightening results when you do so.
@xsl.usage advanced/**
 * <p>The NodeSetDTM class can act as either a NodeVector,
 * NodeList, or NodeIterator.  However, in order for it to
 * act as a NodeVector or NodeList, it's required that
 * setShouldCacheNodes(true) be called before the first
 * nextNode() is called, in order that nodes can be added
 * as they are fetched.  Derived classes that implement iterators
 * must override runTo(int index), in order that they may
 * run the iteration to the given index. </p>
 * 
 * <p>Note that we directly implement the DOM's NodeIterator
 * interface. We do not emulate all the behavior of the
 * standard NodeIterator. In particular, we do not guarantee
 * to present a "live view" of the document ... but in XSLT,
 * the source document should never be mutated, so this should
 * never be an issue.</p>
 * 
 * <p>Thought: Should NodeSetDTM really implement NodeList and NodeIterator,
 * or should there be specific subclasses of it which do so? The
 * advantage of doing it all here is that all NodeSetDTMs will respond
 * to the same calls; the disadvantage is that some of them may return
 * less-than-enlightening results when you do so.</p>
 * @xsl.usage advanced
 */
public class NodeSetDTM extends NodeVector
        implements /* NodeList, NodeIterator, */ DTMIterator, 
        Cloneable
{
    static final long serialVersionUID = 7686480133331317070L;

  Create an empty nodelist.
/**
   * Create an empty nodelist.
   */
  public NodeSetDTM(DTMManager dtmManager)
  {
    super();
    m_manager = dtmManager;
  }

  Create an empty, using the given block size.
Params: blocksize – Size of blocks to allocate
dummy – pass zero for right now.../**
   * Create an empty, using the given block size.
   *
   * @param blocksize Size of blocks to allocate 
   * @param dummy pass zero for right now...
   */
  public NodeSetDTM(int blocksize, int dummy, DTMManager dtmManager)
  {
    super(blocksize);
    m_manager = dtmManager;
  }

  // %TBD%
//  /**
//   * Create a NodeSetDTM, and copy the members of the
//   * given nodelist into it.
//   *
//   * @param nodelist List of Nodes to be made members of the new set.
//   */
//  public NodeSetDTM(NodeList nodelist)
//  {
//
//    super();
//
//    addNodes(nodelist);
//  }

  Create a NodeSetDTM, and copy the members of the
given NodeSetDTM into it.
Params: nodelist – Set of Nodes to be made members of the new set./**
   * Create a NodeSetDTM, and copy the members of the
   * given NodeSetDTM into it.
   *
   * @param nodelist Set of Nodes to be made members of the new set.
   */
  public NodeSetDTM(NodeSetDTM nodelist)
  {

    super();
    m_manager = nodelist.getDTMManager();
    m_root = nodelist.getRoot();

    addNodes((DTMIterator) nodelist);
  }

  Create a NodeSetDTM, and copy the members of the
given DTMIterator into it.
Params: ni – Iterator which yields Nodes to be made members of the new set./**
   * Create a NodeSetDTM, and copy the members of the
   * given DTMIterator into it.
   *
   * @param ni Iterator which yields Nodes to be made members of the new set.
   */
  public NodeSetDTM(DTMIterator ni)
  {

    super();

    m_manager = ni.getDTMManager();
    m_root = ni.getRoot();
    addNodes(ni);
  }
  
  Create a NodeSetDTM, and copy the members of the
given DTMIterator into it.
Params: iterator – Iterator which yields Nodes to be made members of the new set./**
   * Create a NodeSetDTM, and copy the members of the
   * given DTMIterator into it.
   *
   * @param iterator Iterator which yields Nodes to be made members of the new set.
   */
  public NodeSetDTM(NodeIterator iterator, XPathContext xctxt)
  {

    super();

    Node node;
    m_manager = xctxt.getDTMManager();

    while (null != (node = iterator.nextNode()))
    {
      int handle = xctxt.getDTMHandleFromNode(node);
      addNodeInDocOrder(handle, xctxt);
    }
  }
  
  Create a NodeSetDTM, and copy the members of the
given DTMIterator into it.
/**
   * Create a NodeSetDTM, and copy the members of the
   * given DTMIterator into it.
   *
   */
  public NodeSetDTM(NodeList nodeList, XPathContext xctxt)
  {

    super();

    m_manager = xctxt.getDTMManager();

    int n = nodeList.getLength();
    for (int i = 0; i < n; i++) 
    {
      Node node = nodeList.item(i);
      int handle = xctxt.getDTMHandleFromNode(node);
      // Do not reorder or strip duplicate nodes from the given DOM nodelist
      addNode(handle); // addNodeInDocOrder(handle, xctxt);  
    } 
  }


  Create a NodeSetDTM which contains the given Node.
Params: node – Single node to be added to the new set./**
   * Create a NodeSetDTM which contains the given Node.
   *
   * @param node Single node to be added to the new set.
   */
  public NodeSetDTM(int node, DTMManager dtmManager)
  {

    super();
    m_manager = dtmManager;

    addNode(node);
  }
  
  Set the environment in which this iterator operates, which should provide:
a node (the context node... same value as "root" defined below) 
a pair of non-zero positive integers (the context position and the context size) 
a set of variable bindings 
a function library 
the set of namespace declarations in scope for the expression.
At this time the exact implementation of this environment is application 
dependent.  Probably a proper interface will be created fairly soon.
Params: environment – The environment object./**
   * Set the environment in which this iterator operates, which should provide:
   * a node (the context node... same value as "root" defined below) 
   * a pair of non-zero positive integers (the context position and the context size) 
   * a set of variable bindings 
   * a function library 
   * the set of namespace declarations in scope for the expression.
   * 
   * <p>At this time the exact implementation of this environment is application 
   * dependent.  Probably a proper interface will be created fairly soon.</p>
   * 
   * @param environment The environment object.
   */
  public void setEnvironment(Object environment)
  {
    // no-op
  }


  Returns: The root node of the Iterator, as specified when it was created.
For non-Iterator NodeSetDTMs, this will be null./**
   * @return The root node of the Iterator, as specified when it was created.
   * For non-Iterator NodeSetDTMs, this will be null.
   */
  public int getRoot()
  {
    if(DTM.NULL == m_root)
    {
      if(size() > 0)
        return item(0);
      else
        return DTM.NULL;
    }
    else
      return m_root;
  }
  
  Initialize the context values for this expression
after it is cloned.
Params: context – The XPath runtime context for this
transformation./**
   * Initialize the context values for this expression
   * after it is cloned.
   *
   * @param context The XPath runtime context for this
   * transformation.
   */
  public void setRoot(int context, Object environment)
  {
    // no-op, I guess...  (-sb)
  }

  Clone this NodeSetDTM.
At this time, we only expect this to be used with LocPathIterators;
it may not work with other kinds of NodeSetDTMs.
Throws: CloneNotSupportedException – if this subclass of NodeSetDTM
does not support the clone() operation.
Returns: a new NodeSetDTM of the same type, having the same state...
though unless overridden in the subclasses, it may not copy all
the state information./**
   * Clone this NodeSetDTM.
   * At this time, we only expect this to be used with LocPathIterators;
   * it may not work with other kinds of NodeSetDTMs.
   *
   * @return a new NodeSetDTM of the same type, having the same state...
   * though unless overridden in the subclasses, it may not copy all
   * the state information.
   *
   * @throws CloneNotSupportedException if this subclass of NodeSetDTM
   * does not support the clone() operation.
   */
  public Object clone() throws CloneNotSupportedException
  {

    NodeSetDTM clone = (NodeSetDTM) super.clone();

    return clone;
  }

  Get a cloned Iterator, and reset its state to the beginning of the
iteration.
Throws: CloneNotSupportedException – if this subclass of NodeSetDTM
does not support the clone() operation.
Returns: a new NodeSetDTM of the same type, having the same state...
except that the reset() operation has been called./**
   * Get a cloned Iterator, and reset its state to the beginning of the
   * iteration.
   *
   * @return a new NodeSetDTM of the same type, having the same state...
   * except that the reset() operation has been called.
   *
   * @throws CloneNotSupportedException if this subclass of NodeSetDTM
   * does not support the clone() operation.
   */
  public DTMIterator cloneWithReset() throws CloneNotSupportedException
  {

    NodeSetDTM clone = (NodeSetDTM) clone();

    clone.reset();

    return clone;
  }

  Reset the iterator. May have no effect on non-iterator Nodesets.
/**
   * Reset the iterator. May have no effect on non-iterator Nodesets.
   */
  public void reset()
  {
    m_next = 0;
  }

   This attribute determines which node types are presented via the
iterator. The available set of constants is defined in the
DTMFilter interface. For NodeSetDTMs, the mask has been
hardcoded to show all nodes except EntityReference nodes, which have
no equivalent in the XPath data model.
Returns: integer used as a bit-array, containing flags defined in
the DOM's DTMFilter class. The value will be 
SHOW_ALL & ~SHOW_ENTITY_REFERENCE, meaning that
only entity references are suppressed./**
   *  This attribute determines which node types are presented via the
   * iterator. The available set of constants is defined in the
   * <code>DTMFilter</code> interface. For NodeSetDTMs, the mask has been
   * hardcoded to show all nodes except EntityReference nodes, which have
   * no equivalent in the XPath data model.
   *
   * @return integer used as a bit-array, containing flags defined in
   * the DOM's DTMFilter class. The value will be 
   * <code>SHOW_ALL & ~SHOW_ENTITY_REFERENCE</code>, meaning that
   * only entity references are suppressed.
   */
  public int getWhatToShow()
  {
    return DTMFilter.SHOW_ALL & ~DTMFilter.SHOW_ENTITY_REFERENCE;
  }

  The filter object used to screen nodes. Filters are applied to
further reduce (and restructure) the DTMIterator's view of the
document. In our case, we will be using hardcoded filters built
into our iterators... but getFilter() is part of the DOM's 
DTMIterator interface, so we have to support it.
Returns: null, which is slightly misleading. True, there is no
user-written filter object, but in fact we are doing some very
sophisticated custom filtering. A DOM purist might suggest
returning a placeholder object just to indicate that this is
not going to return all nodes selected by whatToShow./**
   * The filter object used to screen nodes. Filters are applied to
   * further reduce (and restructure) the DTMIterator's view of the
   * document. In our case, we will be using hardcoded filters built
   * into our iterators... but getFilter() is part of the DOM's 
   * DTMIterator interface, so we have to support it.
   *
   * @return null, which is slightly misleading. True, there is no
   * user-written filter object, but in fact we are doing some very
   * sophisticated custom filtering. A DOM purist might suggest
   * returning a placeholder object just to indicate that this is
   * not going to return all nodes selected by whatToShow.
   */
  public DTMFilter getFilter()
  {
    return null;
  }

   The value of this flag determines whether the children of entity
reference nodes are visible to the iterator. If false, they will be
skipped over.

 To produce a view of the document that has entity references
expanded and does not expose the entity reference node itself, use the
whatToShow flags to hide the entity reference node and set
expandEntityReferences to true when creating the iterator. To produce
a view of the document that has entity reference nodes but no entity
expansion, use the whatToShow flags to show the entity reference node
and set expandEntityReferences to false.
Returns: true for all iterators based on NodeSetDTM, meaning that the
contents of EntityRefrence nodes may be returned (though whatToShow
says that the EntityReferences themselves are not shown.)/**
   *  The value of this flag determines whether the children of entity
   * reference nodes are visible to the iterator. If false, they will be
   * skipped over.
   * <br> To produce a view of the document that has entity references
   * expanded and does not expose the entity reference node itself, use the
   * whatToShow flags to hide the entity reference node and set
   * expandEntityReferences to true when creating the iterator. To produce
   * a view of the document that has entity reference nodes but no entity
   * expansion, use the whatToShow flags to show the entity reference node
   * and set expandEntityReferences to false.
   *
   * @return true for all iterators based on NodeSetDTM, meaning that the
   * contents of EntityRefrence nodes may be returned (though whatToShow
   * says that the EntityReferences themselves are not shown.)
   */
  public boolean getExpandEntityReferences()
  {
    return true;
  }
  
  Get an instance of a DTM that "owns" a node handle.  Since a node 
iterator may be passed without a DTMManager, this allows the 
caller to easily get the DTM using just the iterator.
Params: nodeHandle – the nodeHandle.
Returns: a non-null DTM reference./**
   * Get an instance of a DTM that "owns" a node handle.  Since a node 
   * iterator may be passed without a DTMManager, this allows the 
   * caller to easily get the DTM using just the iterator.
   *
   * @param nodeHandle the nodeHandle.
   *
   * @return a non-null DTM reference.
   */
  public DTM getDTM(int nodeHandle)
  {
    
    return m_manager.getDTM(nodeHandle);
  }
  
  /* An instance of the DTMManager. */
  DTMManager m_manager;
  
  Get an instance of the DTMManager.  Since a node 
iterator may be passed without a DTMManager, this allows the 
caller to easily get the DTMManager using just the iterator.
Returns: a non-null DTMManager reference./**
   * Get an instance of the DTMManager.  Since a node 
   * iterator may be passed without a DTMManager, this allows the 
   * caller to easily get the DTMManager using just the iterator.
   *
   * @return a non-null DTMManager reference.
   */
  public DTMManager getDTMManager()
  {
    
    return m_manager;
  }

   Returns the next node in the set and advances the position of the
iterator in the set. After a DTMIterator is created, the first call
to nextNode() returns the first node in the set.
Throws: DOMException – 
   INVALID_STATE_ERR: Raised if this method is called after the
  detach method was invoked.
Returns:  The next Node in the set being iterated over, or
  DTM.NULL if there are no more members in that set./**
   *  Returns the next node in the set and advances the position of the
   * iterator in the set. After a DTMIterator is created, the first call
   * to nextNode() returns the first node in the set.
   * @return  The next <code>Node</code> in the set being iterated over, or
   *   <code>DTM.NULL</code> if there are no more members in that set.
   * @throws DOMException
   *    INVALID_STATE_ERR: Raised if this method is called after the
   *   <code>detach</code> method was invoked.
   */
  public int nextNode()
  {

    if ((m_next) < this.size())
    {
      int next = this.elementAt(m_next);

      m_next++;

      return next;
    }
    else
      return DTM.NULL;
  }

   Returns the previous node in the set and moves the position of the
iterator backwards in the set.
Throws: DOMException – 
   INVALID_STATE_ERR: Raised if this method is called after the
  detach method was invoked.
RuntimeException – thrown if this NodeSetDTM is not of 
a cached type, and hence doesn't know what the previous node was.
Returns:  The previous Node in the set being iterated over,
  orDTM.NULL if there are no more members in that set./**
   *  Returns the previous node in the set and moves the position of the
   * iterator backwards in the set.
   * @return  The previous <code>Node</code> in the set being iterated over,
   *   or<code>DTM.NULL</code> if there are no more members in that set.
   * @throws DOMException
   *    INVALID_STATE_ERR: Raised if this method is called after the
   *   <code>detach</code> method was invoked.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a cached type, and hence doesn't know what the previous node was.
   */
  public int previousNode()
  {

    if (!m_cacheNodes)
      throw new RuntimeException(
        XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_CANNOT_ITERATE, null)); //"This NodeSetDTM can not iterate to a previous node!");

    if ((m_next - 1) > 0)
    {
      m_next--;

      return this.elementAt(m_next);
    }
    else
      return DTM.NULL;
  }

  Detaches the iterator from the set which it iterated over, releasing
any computational resources and placing the iterator in the INVALID
state. Afterdetach has been invoked, calls to
nextNode orpreviousNode will raise the
exception INVALID_STATE_ERR.

This operation is a no-op in NodeSetDTM, and will not cause 
INVALID_STATE_ERR to be raised by later operations.

/**
   * Detaches the iterator from the set which it iterated over, releasing
   * any computational resources and placing the iterator in the INVALID
   * state. After<code>detach</code> has been invoked, calls to
   * <code>nextNode</code> or<code>previousNode</code> will raise the
   * exception INVALID_STATE_ERR.
   * <p>
   * This operation is a no-op in NodeSetDTM, and will not cause 
   * INVALID_STATE_ERR to be raised by later operations.
   * </p>
   */
  public void detach(){}
  
  Specify if it's OK for detach to release the iterator for reuse.
Params: allowRelease – true if it is OK for detach to release this iterator 
for pooling./**
   * Specify if it's OK for detach to release the iterator for reuse.
   * 
   * @param allowRelease true if it is OK for detach to release this iterator 
   * for pooling.
   */
  public void allowDetachToRelease(boolean allowRelease)
  {
    // no action for right now.
  }


  Tells if this NodeSetDTM is "fresh", in other words, if
the first nextNode() that is called will return the
first node in the set.
Returns: true if nextNode() would return the first node in the set,
false if it would return a later one./**
   * Tells if this NodeSetDTM is "fresh", in other words, if
   * the first nextNode() that is called will return the
   * first node in the set.
   *
   * @return true if nextNode() would return the first node in the set,
   * false if it would return a later one.
   */
  public boolean isFresh()
  {
    return (m_next == 0);
  }

  If an index is requested, NodeSetDTM will call this method
to run the iterator to the index.  By default this sets
m_next to the index.  If the index argument is -1, this
signals that the iterator should be run to the end.
Params: index – Position to advance (or retreat) to, with
0 requesting the reset ("fresh") position and -1 (or indeed
any out-of-bounds value) requesting the final position.
Throws: RuntimeException – thrown if this NodeSetDTM is not
one of the types which supports indexing/counting./**
   * If an index is requested, NodeSetDTM will call this method
   * to run the iterator to the index.  By default this sets
   * m_next to the index.  If the index argument is -1, this
   * signals that the iterator should be run to the end.
   *
   * @param index Position to advance (or retreat) to, with
   * 0 requesting the reset ("fresh") position and -1 (or indeed
   * any out-of-bounds value) requesting the final position.
   * @throws RuntimeException thrown if this NodeSetDTM is not
   * one of the types which supports indexing/counting.
   */
  public void runTo(int index)
  {

    if (!m_cacheNodes)
      throw new RuntimeException(
        XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_CANNOT_INDEX, null)); //"This NodeSetDTM can not do indexing or counting functions!");

    if ((index >= 0) && (m_next < m_firstFree))
      m_next = index;
    else
      m_next = m_firstFree - 1;
  }

  Returns the indexth item in the collection. If
index is greater than or equal to the number of nodes in
the list, this returns null.
TODO: What happens if index is out of range?
Params: index – Index into the collection.
Returns: The node at the indexth position in the
  NodeList, or null if that is not a valid
  index./**
   * Returns the <code>index</code>th item in the collection. If
   * <code>index</code> is greater than or equal to the number of nodes in
   * the list, this returns <code>null</code>.
   * 
   * TODO: What happens if index is out of range?
   * 
   * @param index Index into the collection.
   * @return The node at the <code>index</code>th position in the
   *   <code>NodeList</code>, or <code>null</code> if that is not a valid
   *   index.
   */
  public int item(int index)
  {

    runTo(index);

    return this.elementAt(index);
  }

  The number of nodes in the list. The range of valid child node indices is
0 to length-1 inclusive. Note that this operation requires
finding all the matching nodes, which may defeat attempts to defer
that work.
Returns: integer indicating how many nodes are represented by this list./**
   * The number of nodes in the list. The range of valid child node indices is
   * 0 to <code>length-1</code> inclusive. Note that this operation requires
   * finding all the matching nodes, which may defeat attempts to defer
   * that work.
   *
   * @return integer indicating how many nodes are represented by this list.
   */
  public int getLength()
  {

    runTo(-1);

    return this.size();
  }

  Add a node to the NodeSetDTM. Not all types of NodeSetDTMs support this
operation
Params: n – Node to be added
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Add a node to the NodeSetDTM. Not all types of NodeSetDTMs support this
   * operation
   *
   * @param n Node to be added
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void addNode(int n)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    this.addElement(n);
  }

  Insert a node at a given position.
Params: n – Node to be added
pos – Offset at which the node is to be inserted,
with 0 being the first position.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Insert a node at a given position.
   *
   * @param n Node to be added
   * @param pos Offset at which the node is to be inserted,
   * with 0 being the first position.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void insertNode(int n, int pos)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    insertElementAt(n, pos);
  }

  Remove a node.
Params: n – Node to be added
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Remove a node.
   *
   * @param n Node to be added
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void removeNode(int n)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    this.removeElement(n);
  }

  // %TBD%
//  /**
//   * Copy NodeList members into this nodelist, adding in
//   * document order.  If a node is null, don't add it.
//   *
//   * @param nodelist List of nodes which should now be referenced by
//   * this NodeSetDTM.
//   * @throws RuntimeException thrown if this NodeSetDTM is not of 
//   * a mutable type.
//   */
//  public void addNodes(NodeList nodelist)
//  {
//
//    if (!m_mutable)
//      throw new RuntimeException("This NodeSetDTM is not mutable!");
//
//    if (null != nodelist)  // defensive to fix a bug that Sanjiva reported.
//    {
//      int nChildren = nodelist.getLength();
//
//      for (int i = 0; i < nChildren; i++)
//      {
//        int obj = nodelist.item(i);
//
//        if (null != obj)
//        {
//          addElement(obj);
//        }
//      }
//    }
//
//    // checkDups();
//  }

  // %TBD%
//  /**
//   * <p>Copy NodeList members into this nodelist, adding in
//   * document order.  Only genuine node references will be copied;
//   * nulls appearing in the source NodeSetDTM will
//   * not be added to this one. </p>
//   * 
//   * <p> In case you're wondering why this function is needed: NodeSetDTM
//   * implements both DTMIterator and NodeList. If this method isn't
//   * provided, Java can't decide which of those to use when addNodes()
//   * is invoked. Providing the more-explicit match avoids that
//   * ambiguity.)</p>
//   *
//   * @param ns NodeSetDTM whose members should be merged into this NodeSetDTM.
//   * @throws RuntimeException thrown if this NodeSetDTM is not of 
//   * a mutable type.
//   */
//  public void addNodes(NodeSetDTM ns)
//  {
//
//    if (!m_mutable)
//      throw new RuntimeException("This NodeSetDTM is not mutable!");
//
//    addNodes((DTMIterator) ns);
//  }

  Copy NodeList members into this nodelist, adding in
document order.  Null references are not added.
Params: iterator – DTMIterator which yields the nodes to be added.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Copy NodeList members into this nodelist, adding in
   * document order.  Null references are not added.
   *
   * @param iterator DTMIterator which yields the nodes to be added.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void addNodes(DTMIterator iterator)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    if (null != iterator)  // defensive to fix a bug that Sanjiva reported.
    {
      int obj;

      while (DTM.NULL != (obj = iterator.nextNode()))
      {
        addElement(obj);
      }
    }

    // checkDups();
  }

  // %TBD%
//  /**
//   * Copy NodeList members into this nodelist, adding in
//   * document order.  If a node is null, don't add it.
//   *
//   * @param nodelist List of nodes to be added
//   * @param support The XPath runtime context.
//   * @throws RuntimeException thrown if this NodeSetDTM is not of 
//   * a mutable type.
//   */
//  public void addNodesInDocOrder(NodeList nodelist, XPathContext support)
//  {
//
//    if (!m_mutable)
//      throw new RuntimeException("This NodeSetDTM is not mutable!");
//
//    int nChildren = nodelist.getLength();
//
//    for (int i = 0; i < nChildren; i++)
//    {
//      int node = nodelist.item(i);
//
//      if (null != node)
//      {
//        addNodeInDocOrder(node, support);
//      }
//    }
//  }

  Copy NodeList members into this nodelist, adding in
document order.  If a node is null, don't add it.
Params: iterator – DTMIterator which yields the nodes to be added.
support – The XPath runtime context.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Copy NodeList members into this nodelist, adding in
   * document order.  If a node is null, don't add it.
   *
   * @param iterator DTMIterator which yields the nodes to be added.
   * @param support The XPath runtime context.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void addNodesInDocOrder(DTMIterator iterator, XPathContext support)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    int node;

    while (DTM.NULL != (node = iterator.nextNode()))
    {
      addNodeInDocOrder(node, support);
    }
  }

  // %TBD%
//  /**
//   * Add the node list to this node set in document order.
//   *
//   * @param start index.
//   * @param end index.
//   * @param testIndex index.
//   * @param nodelist The nodelist to add.
//   * @param support The XPath runtime context.
//   *
//   * @return false always.
//   * @throws RuntimeException thrown if this NodeSetDTM is not of 
//   * a mutable type.
//   */
//  private boolean addNodesInDocOrder(int start, int end, int testIndex,
//                                     NodeList nodelist, XPathContext support)
//  {
//
//    if (!m_mutable)
//      throw new RuntimeException("This NodeSetDTM is not mutable!");
//
//    boolean foundit = false;
//    int i;
//    int node = nodelist.item(testIndex);
//
//    for (i = end; i >= start; i--)
//    {
//      int child = elementAt(i);
//
//      if (child == node)
//      {
//        i = -2;  // Duplicate, suppress insert
//
//        break;
//      }
//
//      if (!support.getDOMHelper().isNodeAfter(node, child))
//      {
//        insertElementAt(node, i + 1);
//
//        testIndex--;
//
//        if (testIndex > 0)
//        {
//          boolean foundPrev = addNodesInDocOrder(0, i, testIndex, nodelist,
//                                                 support);
//
//          if (!foundPrev)
//          {
//            addNodesInDocOrder(i, size() - 1, testIndex, nodelist, support);
//          }
//        }
//
//        break;
//      }
//    }
//
//    if (i == -1)
//    {
//      insertElementAt(node, 0);
//    }
//
//    return foundit;
//  }

  Add the node into a vector of nodes where it should occur in
document order.
Params: node – The node to be added.
test – true if we should test for doc order
support – The XPath runtime context.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type.
Returns: insertIndex./**
   * Add the node into a vector of nodes where it should occur in
   * document order.
   * @param node The node to be added.
   * @param test true if we should test for doc order
   * @param support The XPath runtime context.
   * @return insertIndex.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public int addNodeInDocOrder(int node, boolean test, XPathContext support)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    int insertIndex = -1;

    if (test)
    {

      // This needs to do a binary search, but a binary search 
      // is somewhat tough because the sequence test involves 
      // two nodes.
      int size = size(), i;

      for (i = size - 1; i >= 0; i--)
      {
        int child = elementAt(i);

        if (child == node)
        {
          i = -2;  // Duplicate, suppress insert

          break;
        }

        DTM dtm = support.getDTM(node);
        if (!dtm.isNodeAfter(node, child))
        {
          break;
        }
      }

      if (i != -2)
      {
        insertIndex = i + 1;

        insertElementAt(node, insertIndex);
      }
    }
    else
    {
      insertIndex = this.size();

      boolean foundit = false;

      for (int i = 0; i < insertIndex; i++)
      {
        if (i == node)
        {
          foundit = true;

          break;
        }
      }

      if (!foundit)
        addElement(node);
    }

    // checkDups();
    return insertIndex;
  }  // end addNodeInDocOrder(Vector v, Object obj)

  Add the node into a vector of nodes where it should occur in
document order.
Params: node – The node to be added.
support – The XPath runtime context.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type.
Returns: The index where it was inserted./**
   * Add the node into a vector of nodes where it should occur in
   * document order.
   * @param node The node to be added.
   * @param support The XPath runtime context.
   *
   * @return The index where it was inserted.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public int addNodeInDocOrder(int node, XPathContext support)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    return addNodeInDocOrder(node, true, support);
  }  // end addNodeInDocOrder(Vector v, Object obj)

  Get the length of the list.
Returns: The size of this node set./**
   * Get the length of the list.
   *
   * @return The size of this node set.
   */
  public int size()
  {
    return super.size();
  }

  Append a Node onto the vector.
Params: value – The node to be added.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Append a Node onto the vector.
   *
   * @param value The node to be added.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void addElement(int value)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.addElement(value);
  }

  Inserts the specified node in this vector at the specified index.
Each component in this vector with an index greater or equal to
the specified index is shifted upward to have an index one greater
than the value it had previously.
Params: value – The node to be inserted.
at – The index where the insert should occur.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Inserts the specified node in this vector at the specified index.
   * Each component in this vector with an index greater or equal to
   * the specified index is shifted upward to have an index one greater
   * than the value it had previously.
   *
   * @param value The node to be inserted.
   * @param at The index where the insert should occur.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void insertElementAt(int value, int at)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.insertElementAt(value, at);
  }

  Append the nodes to the list.
Params: nodes – The nodes to be appended to this node set.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Append the nodes to the list.
   *
   * @param nodes The nodes to be appended to this node set.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void appendNodes(NodeVector nodes)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.appendNodes(nodes);
  }

  Inserts the specified node in this vector at the specified index.
Each component in this vector with an index greater or equal to
the specified index is shifted upward to have an index one greater
than the value it had previously.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Inserts the specified node in this vector at the specified index.
   * Each component in this vector with an index greater or equal to
   * the specified index is shifted upward to have an index one greater
   * than the value it had previously.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void removeAllElements()
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.removeAllElements();
  }

  Removes the first occurrence of the argument from this vector.
If the object is found in this vector, each component in the vector
with an index greater or equal to the object's index is shifted
downward to have an index one smaller than the value it had
previously.
Params: s – The node to be removed.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type.
Returns: True if the node was successfully removed/**
   * Removes the first occurrence of the argument from this vector.
   * If the object is found in this vector, each component in the vector
   * with an index greater or equal to the object's index is shifted
   * downward to have an index one smaller than the value it had
   * previously.
   *
   * @param s The node to be removed.
   *
   * @return True if the node was successfully removed
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public boolean removeElement(int s)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    return super.removeElement(s);
  }

  Deletes the component at the specified index. Each component in
this vector with an index greater or equal to the specified
index is shifted downward to have an index one smaller than
the value it had previously.
Params: i – The index of the node to be removed.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Deletes the component at the specified index. Each component in
   * this vector with an index greater or equal to the specified
   * index is shifted downward to have an index one smaller than
   * the value it had previously.
   *
   * @param i The index of the node to be removed.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void removeElementAt(int i)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.removeElementAt(i);
  }

  Sets the component at the specified index of this vector to be the
specified object. The previous component at that position is discarded.
The index must be a value greater than or equal to 0 and less
than the current size of the vector.
Params: node –  The node to be set.
index – The index of the node to be replaced.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Sets the component at the specified index of this vector to be the
   * specified object. The previous component at that position is discarded.
   *
   * The index must be a value greater than or equal to 0 and less
   * than the current size of the vector.
   *
   * @param node  The node to be set.
   * @param index The index of the node to be replaced.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void setElementAt(int node, int index)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.setElementAt(node, index);
  }
  
  Same as setElementAt.
Params: node –  The node to be set.
index – The index of the node to be replaced.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a mutable type./**
   * Same as setElementAt.
   *
   * @param node  The node to be set.
   * @param index The index of the node to be replaced.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a mutable type.
   */
  public void setItem(int node, int index)
  {

    if (!m_mutable)
      throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");

    super.setElementAt(node, index);
  }

  Get the nth element.
Params: i – The index of the requested node.
Returns: Node at specified index./**
   * Get the nth element.
   *
   * @param i The index of the requested node.
   *
   * @return Node at specified index.
   */
  public int elementAt(int i)
  {

    runTo(i);

    return super.elementAt(i);
  }
  
  Tell if the table contains the given node.
Params: s – Node to look for
Returns: True if the given node was found./**
   * Tell if the table contains the given node.
   *
   * @param s Node to look for
   *
   * @return True if the given node was found.
   */
  public boolean contains(int s)
  {

    runTo(-1);

    return super.contains(s);
  }

  Searches for the first occurence of the given argument,
beginning the search at index, and testing for equality
using the equals method.
Params: elem – Node to look for
index – Index of where to start the search
Returns: the index of the first occurrence of the object
argument in this vector at position index or later in the
vector; returns -1 if the object is not found./**
   * Searches for the first occurence of the given argument,
   * beginning the search at index, and testing for equality
   * using the equals method.
   *
   * @param elem Node to look for
   * @param index Index of where to start the search
   * @return the index of the first occurrence of the object
   * argument in this vector at position index or later in the
   * vector; returns -1 if the object is not found.
   */
  public int indexOf(int elem, int index)
  {

    runTo(-1);

    return super.indexOf(elem, index);
  }

  Searches for the first occurence of the given argument,
beginning the search at index, and testing for equality
using the equals method.
Params: elem – Node to look for
Returns: the index of the first occurrence of the object
argument in this vector at position index or later in the
vector; returns -1 if the object is not found./**
   * Searches for the first occurence of the given argument,
   * beginning the search at index, and testing for equality
   * using the equals method.
   *
   * @param elem Node to look for 
   * @return the index of the first occurrence of the object
   * argument in this vector at position index or later in the
   * vector; returns -1 if the object is not found.
   */
  public int indexOf(int elem)
  {

    runTo(-1);

    return super.indexOf(elem);
  }

  If this node is being used as an iterator, the next index that nextNode()
 will return.  /** If this node is being used as an iterator, the next index that nextNode()
   *  will return.  */
  transient protected int m_next = 0;

  Get the current position, which is one less than
the next nextNode() call will retrieve.  i.e. if
you call getCurrentPos() and the return is 0, the next
fetch will take place at index 1.
Returns: The the current position index./**
   * Get the current position, which is one less than
   * the next nextNode() call will retrieve.  i.e. if
   * you call getCurrentPos() and the return is 0, the next
   * fetch will take place at index 1.
   *
   * @return The the current position index.
   */
  public int getCurrentPos()
  {
    return m_next;
  }

  Set the current position in the node set.
Params: i – Must be a valid index.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a cached type, and thus doesn't permit indexed access./**
   * Set the current position in the node set.
   * @param i Must be a valid index.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a cached type, and thus doesn't permit indexed access.
   */
  public void setCurrentPos(int i)
  {

    if (!m_cacheNodes)
      throw new RuntimeException(
        XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_CANNOT_INDEX, null)); //"This NodeSetDTM can not do indexing or counting functions!");

    m_next = i;
  }

  Return the last fetched node.  Needed to support the UnionPathIterator.
Throws: RuntimeException – thrown if this NodeSetDTM is not of 
a cached type, and thus doesn't permit indexed access.
Returns: the last fetched node./**
   * Return the last fetched node.  Needed to support the UnionPathIterator.
   *
   * @return the last fetched node.
   * @throws RuntimeException thrown if this NodeSetDTM is not of 
   * a cached type, and thus doesn't permit indexed access.
   */
  public int getCurrentNode()
  {

    if (!m_cacheNodes)
      throw new RuntimeException(
        "This NodeSetDTM can not do indexing or counting functions!");

    int saved = m_next;
    // because nextNode always increments
    // But watch out for copy29, where the root iterator didn't
    // have nextNode called on it.
    int current = (m_next > 0) ? m_next-1 : m_next; 
    int n = (current < m_firstFree) ? elementAt(current) : DTM.NULL;
    m_next = saved; // HACK: I think this is a bit of a hack.  -sb
    return n;
  }

  True if this list can be mutated.  /** True if this list can be mutated.  */
  transient protected boolean m_mutable = true;

  True if this list is cached.
 @serial  /** True if this list is cached.
   *  @serial  */
  transient protected boolean m_cacheNodes = true;
  
  The root of the iteration, if available. /** The root of the iteration, if available. */
  protected int m_root = DTM.NULL;

  Get whether or not this is a cached node set.
Returns: True if this list is cached./**
   * Get whether or not this is a cached node set.
   *
   *
   * @return True if this list is cached.
   */
  public boolean getShouldCacheNodes()
  {
    return m_cacheNodes;
  }

  If setShouldCacheNodes(true) is called, then nodes will
be cached.  They are not cached by default. This switch must
be set before the first call to nextNode is made, to ensure
that all nodes are cached.
Params: b – true if this node set should be cached.
Throws: RuntimeException – thrown if an attempt is made to
request caching after we've already begun stepping through the
nodes in this set./**
   * If setShouldCacheNodes(true) is called, then nodes will
   * be cached.  They are not cached by default. This switch must
   * be set before the first call to nextNode is made, to ensure
   * that all nodes are cached.
   *
   * @param b true if this node set should be cached.
   * @throws RuntimeException thrown if an attempt is made to
   * request caching after we've already begun stepping through the
   * nodes in this set.
  */
  public void setShouldCacheNodes(boolean b)
  {

    if (!isFresh())
      throw new RuntimeException(
        XSLMessages.createXPATHMessage(XPATHErrorResources.ER_CANNOT_CALL_SETSHOULDCACHENODE, null)); //"Can not call setShouldCacheNodes after nextNode has been called!");

    m_cacheNodes = b;
    m_mutable = true;
  }
  
  Tells if this iterator can have nodes added to it or set via 
the setItem(int node, int index) method.
Returns: True if the nodelist can be mutated./**
   * Tells if this iterator can have nodes added to it or set via 
   * the <code>setItem(int node, int index)</code> method.
   * 
   * @return True if the nodelist can be mutated.
   */
  public boolean isMutable()
  {
    return m_mutable;
  }
  
  transient private int m_last = 0;
  
  public int getLast()
  {
    return m_last;
  }
  
  public void setLast(int last)
  {
    m_last = last;
  }
  
  Returns true if all the nodes in the iteration well be returned in document 
order.
Returns: true as a default./**
   * Returns true if all the nodes in the iteration well be returned in document 
   * order.
   * 
   * @return true as a default.
   */
  public boolean isDocOrdered()
  {
    return true;
  }
  
  Returns the axis being iterated, if it is known.
Returns: Axis.CHILD, etc., or -1 if the axis is not known or is of multiple 
types./**
   * Returns the axis being iterated, if it is known.
   * 
   * @return Axis.CHILD, etc., or -1 if the axis is not known or is of multiple 
   * types.
   */
  public int getAxis()
  {
    return -1;
  }
  

}
Throws:	CloneNotSupportedException – if this subclass of NodeSetDTM does not support the clone() operation.
Returns:	a new NodeSetDTM of the same type, having the same state... though unless overridden in the subclasses, it may not copy all the state information.
Params:	nodeHandle – the nodeHandle.
Returns:	a non-null DTM reference.
Throws:	DOMException – INVALID_STATE_ERR: Raised if this method is called after the `detach` method was invoked.
Returns:	The next `Node` in the set being iterated over, or `DTM.NULL` if there are no more members in that set.
Params:	index – Position to advance (or retreat) to, with 0 requesting the reset ("fresh") position and -1 (or indeed any out-of-bounds value) requesting the final position.
Throws:	RuntimeException – thrown if this NodeSetDTM is not one of the types which supports indexing/counting.
Params:	index – Index into the collection.
Returns:	The node at the `index`th position in the `NodeList`, or `null` if that is not a valid index.
Params:	n – Node to be added
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	n – Node to be added pos – Offset at which the node is to be inserted, with 0 being the first position.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	iterator – DTMIterator which yields the nodes to be added.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	node – The node to be added. test – true if we should test for doc order support – The XPath runtime context.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Returns:	insertIndex.
Params:	node – The node to be added. support – The XPath runtime context.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Returns:	The index where it was inserted.
Params:	value – The node to be added.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	value – The node to be inserted. at – The index where the insert should occur.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	nodes – The nodes to be appended to this node set.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	s – The node to be removed.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Returns:	True if the node was successfully removed
Params:	i – The index of the node to be removed.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	node – The node to be set. index – The index of the node to be replaced.
Throws:	RuntimeException – thrown if this NodeSetDTM is not of a mutable type.
Params:	i – The index of the requested node.
Returns:	Node at specified index.
Params:	s – Node to look for
Returns:	True if the given node was found.
Params:	elem – Node to look for index – Index of where to start the search
Returns:	the index of the first occurrence of the object argument in this vector at position index or later in the vector; returns -1 if the object is not found.
Params:	elem – Node to look for
Returns:	the index of the first occurrence of the object argument in this vector at position index or later in the vector; returns -1 if the object is not found.
/

xalan/ serializer/ 2.7.2/ org/apache/xpath/NodeSetDTM.java
