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/*
* $Id: OpMapVector.java,v 1.8 2010-11-01 04:35:07 joehw Exp $
*/
package com.sun.org.apache.xpath.internal.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;
}
}