Esempio n. 1
0
    /**
     * Evaluate the reference to the <code>key</code> or <code>id</code> function with the context
     * specified by {@link #setStartNode(int)} and set up this iterator to iterate over the DTM
     * nodes that are to be returned.
     */
    protected void init() {
      super.init();
      _position = 0;

      // All nodes retrieved are in the same document
      int rootHandle = _dom.getAxisIterator(Axis.ROOT).setStartNode(_startNode).next();

      // Is the argument not a node set?
      if (_keyValueIterator == null) {
        // Look up nodes returned for the single string argument
        _nodes = lookupNodes(rootHandle, _keyValue);

        if (_nodes == null) {
          _nodes = EMPTY_NODES;
        }
      } else {
        DTMAxisIterator keyValues = _keyValueIterator.reset();
        int retrievedKeyValueIdx = 0;
        boolean foundNodes = false;

        _nodes = null;

        // For each node in the node set argument, get the string value
        // and look up the nodes returned by key or id for that string
        // value.  If at most one string value has nodes associated,
        // the nodes will be stored in _nodes; otherwise, the nodes
        // will be placed in a heap.
        for (int keyValueNode = keyValues.next();
            keyValueNode != DTMAxisIterator.END;
            keyValueNode = keyValues.next()) {

          String keyValue = BasisLibrary.stringF(keyValueNode, _dom);

          IntegerArray nodes = lookupNodes(rootHandle, keyValue);

          if (nodes != null) {
            if (!foundNodes) {
              _nodes = nodes;
              foundNodes = true;
            } else {
              if (_nodes != null) {
                addHeapNode(new KeyIndexHeapNode(_nodes));
                _nodes = null;
              }
              addHeapNode(new KeyIndexHeapNode(nodes));
            }
          }
        }

        if (!foundNodes) {
          _nodes = EMPTY_NODES;
        }
      }
    }
Esempio n. 2
0
 public DTMAxisIterator reset() {
   _source.reset();
   return resetPosition();
 }