dtmdefaultbaseiterators.java

来自「java jdk 1.4的源码」· Java 代码 · 共 1,931 行 · 第 1/4 页

   */
  private final class NamespaceChildrenIterator
          extends InternalAxisIteratorBase
  {

    /** The extended type ID being requested. */
    private final int _nsType;

    /**
     * Constructor NamespaceChildrenIterator
     *
     *
     * @param type The extended type ID being requested.
     */
    public NamespaceChildrenIterator(final int type)
    {
      _nsType = 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)
    {

      if (_isRestartable)
      {
        _startNode = node;
        _currentNode = NOTPROCESSED;

        return resetPosition();
      }

      return this;
    }

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

      for (int node = (NOTPROCESSED == _currentNode)
                      ? getFirstChild(_startNode)
                      : getNextSibling(_currentNode); node
                        != END; node = getNextSibling(node))
      {
        if (getNamespaceType(node) == _nsType)
        {
          _currentNode = node;

          return returnNode(node);
        }
      }

      return END;
    }
  }  // end of TypedChildrenIterator
  
  /**
   * Iterator that returns the namespace nodes as defined by the XPath data model 
   * for a given node.
   */
  private class NamespaceIterator
          extends InternalAxisIteratorBase
  {

    /**
     * Constructor NamespaceAttributeIterator
     */
    public NamespaceIterator()
    {

      super();
    }

    /**
     * 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)
    {

      if (_isRestartable)
      {
        _startNode = node;
        _currentNode = getFirstNamespaceNode(node, true);

        return resetPosition();
      }

      return this;
    }

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

      int node = _currentNode;

      if (DTM.NULL != node)
        _currentNode = getNextNamespaceNode(_startNode, node, true);

      return returnNode(node);
    }
  }  // end of NamespaceIterator
  
  /**
   * Iterator that returns the namespace nodes as defined by the XPath data model 
   * for a given node, filtered by extended type ID.
   */
  private class TypedNamespaceIterator extends NamespaceIterator
  {

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

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

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

      for (int node = super.next(); node != END; node = super.next())
      {
        if (getExpandedTypeID(node) == _nodeType)
        {
          _currentNode = node;

          return returnNode(node);
        }
      }

      return END;
    }
  }  // end of TypedNamespaceIterator
  
  /**
   * Iterator that returns the the root node as defined by the XPath data model 
   * for a given node.
   */
  private class RootIterator
          extends InternalAxisIteratorBase
  {

    /**
     * Constructor RootIterator
     */
    public RootIterator()
    {

      super();
    }

    /**
     * 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)
    {

      if (_isRestartable)
      {
        _startNode = getDocumentRoot(node);
        _currentNode = NULL;

        return resetPosition();
      }

      return this;
    }

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

      _currentNode = _startNode;

      return returnNode(_startNode);
    }
  }  // end of RootIterator
  
  /**
   * Iterator that returns the namespace nodes as defined by the XPath data model 
   * for a given node, filtered by extended type ID.
   */
  private class TypedRootIterator extends RootIterator
  {

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

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

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

      for (int node = super.next(); node != END; node = super.next())
      {
        if (getExpandedTypeID(node) == _nodeType)
        {
          _currentNode = node;

          return returnNode(node);
        }
      }

      return END;
    }
  }  // end of TypedRootIterator

  /**
   * Iterator that returns attributes within a given namespace for a node.
   */
  private final class NamespaceAttributeIterator
          extends InternalAxisIteratorBase
  {

    /** The extended type ID being requested. */
    private final int _nsType;

    /**
     * Constructor NamespaceAttributeIterator
     *
     *
     * @param nsType The extended type ID being requested.
     */
    public NamespaceAttributeIterator(int nsType)
    {

      super();

      _nsType = nsType;
    }

    /**
     * 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)
    {

      if (_isRestartable)
      {
        _startNode = node;
        _currentNode = getFirstNamespaceNode(node, false);

        return resetPosition();
      }

      return this;
    }

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

      int node = _currentNode;

      if (DTM.NULL != node)
        _currentNode = getNextNamespaceNode(_startNode, node, false);

      return returnNode(node);
    }
  }  // end of TypedChildrenIterator

  /**
   * Iterator that returns all siblings of a given node.
   */
  private class FollowingSiblingIterator 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)
    {

      if (_isRestartable)
      {
        _currentNode = _startNode = node;

        return resetPosition();
      }

      return this;
    }

    /**
     * Get the next node in the iteration.
     *
     * @return The next node handle in the iteration, or END.
     */
    public int next()
    {
      return returnNode(_currentNode = getNextSibling(_currentNode));
    }
  }  // end of FollowingSiblingIterator

  /**
   * Iterator that returns all following siblings of a given node.
   */
  private final class TypedFollowingSiblingIterator
          extends FollowingSiblingIterator
  {

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

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

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

      int node;

      while ((node = super.next()) != NULL
             && getExpandedTypeID(node) != _nodeType){}

      return node;
    }
  }  // end of TypedFollowingSiblingIterator

  /**
   * Iterator that returns attribute nodes (of what nodes?)
   */
  private final class AttributeIterator extends InternalAxisIteratorBase
  {

    // assumes caller will pass element nodes

    /**
     * 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)
    {

      if (_isRestartable)
      {
        _startNode = node;
        _currentNode = getFirstAttribute(node);

        return resetPosition();
      }

      return this;
    }

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

      final int node = _currentNode;

      _currentNode = getNextAttribute(node);

      return returnNode(node);
    }
  }  // end of AttributeIterator

  /**
   * Iterator that returns attribute nodes of a given type
   */
  private final class TypedAttributeIterator extends InternalAxisIteratorBase
  {

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

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

    // assumes caller will pass element nodes

    /**
     * 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)
    {

      if (_isRestartable)