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/*
* $Id: StringVector.java,v 1.8 2010-11-01 04:34:52 joehw Exp $
*/
package com.sun.org.apache.xml.internal.utils;
/**
* A very simple table that stores a list of strings, optimized
* for small lists.
* @xsl.usage internal
*/
public class StringVector implements java.io.Serializable
{
static final long serialVersionUID = 4995234972032919748L;
/** @serial Size of blocks to allocate */
protected int m_blocksize;
/** @serial Array of strings this contains */
protected String m_map[];
/** @serial Number of strings this contains */
protected int m_firstFree = 0;
/** @serial Size of the array */
protected int m_mapSize;
/**
* Default constructor. Note that the default
* block size is very small, for small lists.
*/
public StringVector()
{
m_blocksize = 8;
m_mapSize = m_blocksize;
m_map = new String[m_blocksize];
}
/**
* Construct a StringVector, using the given block size.
*
* @param blocksize Size of the blocks to allocate
*/
public StringVector(int blocksize)
{
m_blocksize = blocksize;
m_mapSize = blocksize;
m_map = new String[blocksize];
}
/**
* Get the length of the list.
*
* @return Number of strings in the list
*/
public int getLength()
{
return m_firstFree;
}
/**
* Get the length of the list.
*
* @return Number of strings in the list
*/
public final int size()
{
return m_firstFree;
}
/**
* Append a string onto the vector.
*
* @param value Sting to add to the vector
*/
public final void addElement(String value)
{
if ((m_firstFree + 1) >= m_mapSize)
{
m_mapSize += m_blocksize;
String newMap[] = new String[m_mapSize];
System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1);
m_map = newMap;
}
m_map[m_firstFree] = value;
m_firstFree++;
}
/**
* Get the nth element.
*
* @param i Index of string to find
*
* @return String at given index
*/
public final String elementAt(int i)
{
return m_map[i];
}
/**
* Tell if the table contains the given string.
*
* @param s String to look for
*
* @return True if the string is in this table
*/
public final boolean contains(String s)
{
if (null == s)
return false;
for (int i = 0; i < m_firstFree; i++)
{
if (m_map[i].equals(s))
return true;
}
return false;
}
/**
* Tell if the table contains the given string. Ignore case.
*
* @param s String to find
*
* @return True if the String is in this vector
*/
public final boolean containsIgnoreCase(String s)
{
if (null == s)
return false;
for (int i = 0; i < m_firstFree; i++)
{
if (m_map[i].equalsIgnoreCase(s))
return true;
}
return false;
}
/**
* Tell if the table contains the given string.
*
* @param s String to push into the vector
*/
public final void push(String s)
{
if ((m_firstFree + 1) >= m_mapSize)
{
m_mapSize += m_blocksize;
String newMap[] = new String[m_mapSize];
System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1);
m_map = newMap;
}
m_map[m_firstFree] = s;
m_firstFree++;
}
/**
* Pop the tail of this vector.
*
* @return The String last added to this vector or null not found.
* The string is removed from the vector.
*/
public final String pop()
{
if (m_firstFree <= 0)
return null;
m_firstFree--;
String s = m_map[m_firstFree];
m_map[m_firstFree] = null;
return s;
}
/**
* Get the string at the tail of this vector without popping.
*
* @return The string at the tail of this vector.
*/
public final String peek()
{
return (m_firstFree <= 0) ? null : m_map[m_firstFree - 1];
}
}