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.xpath.compiler;
  
  /**
   * 
   * Like IntVector, but used only for the OpMap array.  Length of array
   * is kept in the m_lengthPos position of the array.  Only the required methods 
   * are in included here.
   * @xsl.usage internal
   */
  public class OpMapVector {
      
   /** Size of blocks to allocate          */
    protected int m_blocksize;
  
    /** Array of ints          */
    protected int m_map[]; // IntStack is trying to see this directly
  
    /** Position where size of array is kept          */
    protected int m_lengthPos = 0;
  
    /** Size of array          */
    protected int m_mapSize;
    
      /**
     * Construct a OpMapVector, using the given block size.
     *
     * @param blocksize Size of block to allocate
     */
    public OpMapVector(int blocksize, int increaseSize, int lengthPos)
    {
  
      m_blocksize = increaseSize;
      m_mapSize = blocksize;
      m_lengthPos = lengthPos;
      m_map = new int[blocksize];
    }
    
    /**
     * Get the nth element.
     *
     * @param i index of object to get
     *
     * @return object at given index
     */
    public final int elementAt(int i)
    {
      return m_map[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.
     *
     * @param value object to set
     * @param index Index of where to set the object
     */
    public final void setElementAt(int value, int index)
    {
      if (index >= m_mapSize)
      {
        int oldSize = m_mapSize;
        
        m_mapSize += m_blocksize;
  
        int newMap[] = new int[m_mapSize];
  
        System.arraycopy(m_map, 0, newMap, 0, oldSize);
  
        m_map = newMap;
      }
  
      m_map[index] = value;
    }
    
    
    /*
     * Reset the array to the supplied size.  No checking is done.
     * 
     * @param size The size to trim to.
     */
    public final void setToSize(int size) {
      
      int newMap[] = new int[size];
  
      System.arraycopy(m_map, 0, newMap, 0, m_map[m_lengthPos]);
  
      m_mapSize = size;
      m_map = newMap;
      
    }  
  
  }
  