dtmdefaultbaseiterators.java

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     *
     * @return A DTMAxisIterator set to the start of the iteration.
     */
    public DTMAxisIterator setStartNode(int node)
    {
//%HZ%: Added reference to DTMDefaultBase.ROOTNODE back in, temporarily
      if (node == DTMDefaultBase.ROOTNODE)
        node = getDocument();
      m_realStartNode = node;

      if (_isRestartable)
      {
        int nodeID = makeNodeIdentity(node);

        if (!_includeSelf && node != DTM.NULL) {
          nodeID = _parent(nodeID);
          node = makeNodeHandle(nodeID);
        }

        _startNode = node;

        while (nodeID != END) {
          m_ancestors.addElement(node);
          nodeID = _parent(nodeID);
          node = makeNodeHandle(nodeID);
        }
        m_ancestorsPos = m_ancestors.size()-1;

        _currentNode = (m_ancestorsPos>=0)
                               ? m_ancestors.elementAt(m_ancestorsPos)
                               : DTM.NULL;

        return resetPosition();
      }

      return this;
    }

    /**
     * Resets the iterator to the last start node.
     *
     * @return A DTMAxisIterator, which may or may not be the same as this
     *         iterator.
     */
    public DTMAxisIterator reset()
    {

      m_ancestorsPos = m_ancestors.size()-1;

      _currentNode = (m_ancestorsPos>=0) ? m_ancestors.elementAt(m_ancestorsPos)
                                         : DTM.NULL;

      return resetPosition();
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {

      int next = _currentNode;
      
      int pos = --m_ancestorsPos;

      _currentNode = (pos >= 0) ? m_ancestors.elementAt(m_ancestorsPos)
                                : DTM.NULL;
      
      return returnNode(next);
    }

    public void setMark() {
        m_markedPos = m_ancestorsPos;
    }

    public void gotoMark() {
        m_ancestorsPos = m_markedPos;
        _currentNode = m_ancestorsPos>=0 ? m_ancestors.elementAt(m_ancestorsPos)
                                         : DTM.NULL;
    }
  }  // end of AncestorIterator

  /**
   * Typed iterator that returns the ancestors of a given node.
   */
  public final class TypedAncestorIterator extends AncestorIterator
  {

    /** The extended type ID that was requested. */
    private final int _nodeType;

    /**
     * Constructor TypedAncestorIterator
     *
     *
     * @param type The extended type ID being requested.
     */
    public TypedAncestorIterator(int type)
    {
      _nodeType = type;
    }

    /**
     * Set start to END should 'close' the iterator,
     * i.e. subsequent call to next() should return END.
     *
     * @param node Sets the root of the iteration.
     *
     * @return A DTMAxisIterator set to the start of the iteration.
     */
    public DTMAxisIterator setStartNode(int node)
    {
//%HZ%: Added reference to DTMDefaultBase.ROOTNODE back in, temporarily
      if (node == DTMDefaultBase.ROOTNODE)
        node = getDocument();
      m_realStartNode = node;

      if (_isRestartable)
      {
        int nodeID = makeNodeIdentity(node);
        int nodeType = _nodeType;

        if (!_includeSelf && node != DTM.NULL) {
          nodeID = _parent(nodeID);
        }

        _startNode = node;

        if (nodeType >= DTM.NTYPES) {
          while (nodeID != END) {
            int eType = _exptype(nodeID);

            if (eType == nodeType) {
              m_ancestors.addElement(makeNodeHandle(nodeID));
            }
            nodeID = _parent(nodeID);
          }
        } else {
          while (nodeID != END) {
            int eType = _exptype(nodeID);

            if ((eType >= DTM.NTYPES
                    && m_expandedNameTable.getType(eType) == nodeType)
                || (eType < DTM.NTYPES && eType == nodeType)) {
              m_ancestors.addElement(makeNodeHandle(nodeID));
            }
            nodeID = _parent(nodeID);
          }
        }
        m_ancestorsPos = m_ancestors.size()-1;

        _currentNode = (m_ancestorsPos>=0)
                               ? m_ancestors.elementAt(m_ancestorsPos)
                               : DTM.NULL;

        return resetPosition();
      }

      return this;
    }
  }  // end of TypedAncestorIterator

  /**
   * Iterator that returns the descendants of a given node.
   */
  public class DescendantIterator extends InternalAxisIteratorBase
  {

    /**
     * Set start to END should 'close' the iterator,
     * i.e. subsequent call to next() should return END.
     *
     * @param node Sets the root of the iteration.
     *
     * @return A DTMAxisIterator set to the start of the iteration.
     */
    public DTMAxisIterator setStartNode(int node)
    {
//%HZ%: Added reference to DTMDefaultBase.ROOTNODE back in, temporarily
      if (node == DTMDefaultBase.ROOTNODE)
        node = getDocument();
      if (_isRestartable)
      {
        node = makeNodeIdentity(node);
        _startNode = node;

        if (_includeSelf)
          node--;

        _currentNode = node;

        return resetPosition();
      }

      return this;
    }

    /**
     * Tell if this node identity is a descendant.  Assumes that
     * the node info for the element has already been obtained.
     *
     * This one-sided test works only if the parent has been
     * previously tested and is known to be a descendent. It fails if
     * the parent is the _startNode's next sibling, or indeed any node
     * that follows _startNode in document order.  That may suffice
     * for this iterator, but it's not really an isDescendent() test.
     * %REVIEW% rename?
     *
     * @param identity The index number of the node in question.
     * @return true if the index is a descendant of _startNode.
     */
    protected boolean isDescendant(int identity)
    {
      return (_parent(identity) >= _startNode) || (_startNode == identity);
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {
      if (_startNode == NULL) {
        return NULL;
      }

      if (_includeSelf && (_currentNode + 1) == _startNode)
          return returnNode(makeNodeHandle(++_currentNode)); // | m_dtmIdent);

      int node = _currentNode;
      int type;

      do {
        node++;
        type = _type(node);

        if (NULL == type ||!isDescendant(node)) {
          _currentNode = NULL;
          return END;
        }
      } while(ATTRIBUTE_NODE == type || TEXT_NODE == type
                 || NAMESPACE_NODE == type);

      _currentNode = node;
      return returnNode(makeNodeHandle(node));  // make handle.
    }
  
    /**
     * Reset.
     *
     */ 
  public DTMAxisIterator reset()
  {

    final boolean temp = _isRestartable;

    _isRestartable = true;

    setStartNode(makeNodeHandle(_startNode));

    _isRestartable = temp;

    return this;
  }
    
  }  // end of DescendantIterator

  /**
   * Typed iterator that returns the descendants of a given node.
   */
  public final class TypedDescendantIterator extends DescendantIterator
  {

    /** The extended type ID that was requested. */
    private final int _nodeType;

    /**
     * Constructor TypedDescendantIterator
     *
     *
     * @param nodeType Extended type ID being requested.
     */
    public TypedDescendantIterator(int nodeType)
    {
      _nodeType = nodeType;
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {
      int node;
      int type;

      if (_startNode == NULL) {
        return NULL;
      }

      node = _currentNode;

      do
      {
        node++;
        type = _type(node);

        if (NULL == type ||!isDescendant(node)) {
          _currentNode = NULL;
          return END;
        }
      }
      while (type != _nodeType && _exptype(node) != _nodeType);

      _currentNode = node;
      return returnNode(makeNodeHandle(node));
    }
  }  // end of TypedDescendantIterator

  /**
   * Iterator that returns the descendants of a given node.
   * I'm not exactly clear about this one... -sb
   */
  public class NthDescendantIterator extends DescendantIterator
  {

    /** The current nth position. */
    int _pos;

    /**
     * Constructor NthDescendantIterator
     *
     *
     * @param pos The nth position being requested.
     */
    public NthDescendantIterator(int pos)
    {
      _pos = pos;
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {

      // I'm not exactly clear yet what this is doing... -sb
      int node;

      while ((node = super.next()) != END)
      {
        node = makeNodeIdentity(node);

        int parent = _parent(node);
        int child = _firstch(parent);
        int pos = 0;

        do
        {
          int type = _type(child);

          if (ELEMENT_NODE == type)
            pos++;
        }
        while ((pos < _pos) && (child = _nextsib(child)) != END);

        if (node == child)
          return node;
      }

      return (END);
    }
  }  // end of NthDescendantIterator

  /**
   * Class SingletonIterator.
   */
  public class SingletonIterator extends InternalAxisIteratorBase
  {

    /** (not sure yet what this is.  -sb)  (sc & sb remove final to compile in JDK 1.1.8) */
    private boolean _isConstant;

    /**
     * Constructor SingletonIterator
     *
     */
    public SingletonIterator()
    {
      this(Integer.MIN_VALUE, false);
    }

    /**
     * Constructor SingletonIterator
     *
     *
     * @param node The node handle to return.
     */
    public SingletonIterator(int node)
    {
      this(node, false);
    }

    /**
     * Constructor SingletonIterator
     *
     *
     * @param node the node handle to return.
     * @param constant (Not sure what this is yet.  -sb)
     */
    public SingletonIterator(int node, boolean constant)
    {
      _currentNode = _startNode = node;
      _isConstant = constant;
    }

    /**
     * Set start to END should 'close' the iterator,
     * i.e. subsequent call to next() should return END.
     *
     * @param node Sets the root of the iteration.
     *
     * @return A DTMAxisIterator set to the start of the iteration.
     */
    public DTMAxisIterator setStartNode(int node)
    {
//%HZ%: Added reference to DTMDefaultBase.ROOTNODE back in, temporarily
      if (node == DTMDefaultBase.ROOTNODE)
        node = getDocument();
      if (_isConstant)
      {
        _currentNode = _startNode;

        return resetPosition();
      }
      else if (_isRestartable)
      {
        if (_currentNode == Integer.MIN_VALUE)
        {
          _currentNode = _startNode = node;
        }

        return resetPosition();
      }

      return this;
    }

    /**
     * Resets the iterator to the last start node.
     *
     * @return A DTMAxisIterator, which may or may not be the same as this
     *         iterator.
     */
    public DTMAxisIterator reset()
    {

      if (_isConstant)
      {
        _currentNode = _startNode;

        return resetPosition();
      }
      else
      {
        final boolean temp = _isRestartable;

        _isRestartable = true;

        setStartNode(_startNode);

        _isRestartable = temp;
      }

      return this;
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {

      final int result = _currentNode;

      _currentNode = END;

      return returnNode(result);
    }
  }  // end of SingletonIterator

  /**
   * Iterator that returns a given node only if it is of a given type.
   */
  public final class TypedSingletonIterator extends SingletonIterator
  {

    /** The extended type ID that was requested. */
    private final int _nodeType;

    /**
     * Constructor TypedSingletonIterator
     *
     *
     * @param nodeType The extended type ID being requested.
     */
    public TypedSingletonIterator(int nodeType)
    {
      _nodeType = nodeType;
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {

      //final int result = super.next();
      final int result = _currentNode;
      int nodeType = _nodeType;

      _currentNode = END;

      if (nodeType >= DTM.NTYPES) {
        if (getExpandedTypeID(result) == nodeType) {
          return returnNode(result);
        }
      } else {
        if (getNodeType(result) == nodeType) {
          return returnNode(result);
        }
      }

      return NULL;
    }
  }  // end of TypedSingletonIterator
}