code: /*
   * 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.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.xsltc.dom;
  
  import org.apache.xml.dtm.DTMAxisIterator;
  import org.apache.xml.dtm.ref.DTMAxisIteratorBase;
  import org.apache.xalan.xsltc.util.IntegerArray;
  
  /**
   * CachedNodeListIterator is used for select expressions in a 
   * variable or parameter. This iterator caches all nodes in an 
   * IntegerArray. Its cloneIterator() method is overridden to 
   * return an object of ClonedNodeListIterator.
   */
  public final class CachedNodeListIterator extends DTMAxisIteratorBase {
  
      /**
       * Source for this iterator.
       */
      private DTMAxisIterator _source;
      private IntegerArray _nodes = new IntegerArray();
      private int _numCachedNodes = 0;
      private int _index = 0;
      private boolean _isEnded = false;
  
      public CachedNodeListIterator(DTMAxisIterator source) {
  	_source = source;
      }
  
      public void setRestartable(boolean isRestartable) {
  	//_isRestartable = isRestartable;
  	//_source.setRestartable(isRestartable);
      }
  
      public DTMAxisIterator setStartNode(int node) {
  	if (_isRestartable) {
  	    _startNode = node;
  	    _source.setStartNode(node);
  	    resetPosition();
  	    
  	    _isRestartable = false;
  	}
  	return this;
      }
  
      public int next() {
          return getNode(_index++);
      }
      
      public int getPosition() {
      	return _index == 0 ? 1 : _index;
      }
      
      public int getNodeByPosition(int pos) {
      	return getNode(pos);
      }
          
      public int getNode(int index) {
          if (index < _numCachedNodes) {
              return _nodes.at(index);
          }
          else if (!_isEnded){
              int node = _source.next();
              if (node != END) {
              	_nodes.add(node);
              	_numCachedNodes++;
              }
              else {
              	_isEnded = true;
              }
              return node;
          }
          else
              return END;
      }
  
      public DTMAxisIterator cloneIterator() {
  	ClonedNodeListIterator clone = new ClonedNodeListIterator(this);
  	return clone;
      }
  
      public DTMAxisIterator reset() {
      	_index = 0;
      	return this;
      }
      
      public void setMark() {
  	_source.setMark();
      }
  
      public void gotoMark() {
  	_source.gotoMark();
      }
  }
  