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.xml.utils;
  
  /**
   * A very simple lookup table that stores a list of strings, the even
   * number strings being keys, and the odd number strings being values.
   * @xsl.usage internal
   */
  public class StringToStringTable
  {
  
    /** Size of blocks to allocate          */
    private int m_blocksize;
  
    /** Array of strings this contains          */
    private String m_map[];
  
    /** Number of strings this contains           */
    private int m_firstFree = 0;
  
    /** Size of this table           */
    private int m_mapSize;
  
    /**
     * Default constructor.  Note that the default
     * block size is very small, for small lists.
     */
    public StringToStringTable()
    {
  
      m_blocksize = 16;
      m_mapSize = m_blocksize;
      m_map = new String[m_blocksize];
    }
  
    /**
     * Construct a StringToStringTable, using the given block size.
     *
     * @param blocksize Size of blocks to allocate 
     */
    public StringToStringTable(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 final int getLength()
    {
      return m_firstFree;
    }
  
    /**
     * Append a string onto the vector.
     * The strings go to the even locations in the array 
     * and the values in the odd. 
     *
     * @param key String to add to the list 
     * @param value Value of the string
     */
    public final void put(String key, String value)
    {
  
      if ((m_firstFree + 2) >= 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] = key;
  
      m_firstFree++;
  
      m_map[m_firstFree] = value;
  
      m_firstFree++;
    }
  
    /**
     * Tell if the table contains the given string.
     *
     * @param key String to look up
     *
     * @return return the value of the string or null if not found. 
     */
    public final String get(String key)
    {
  
      for (int i = 0; i < m_firstFree; i += 2)
      {
        if (m_map[i].equals(key))
          return m_map[i + 1];
      }
  
      return null;
    }
  
    /**
     * Remove the given string and its value from this table.
     *
     * @param key String to remove from the table
     */
    public final void remove(String key)
    {
  
      for (int i = 0; i < m_firstFree; i += 2)
      {
        if (m_map[i].equals(key))
        {
          if ((i + 2) < m_firstFree)
            System.arraycopy(m_map, i + 2, m_map, i, m_firstFree - (i + 2));
  
          m_firstFree -= 2;
          m_map[m_firstFree] = null;
          m_map[m_firstFree + 1] = null;
  
          break;
        }
      }
    }
  
    /**
     * Tell if the table contains the given string. Ignore case
     *
     * @param key String to look up
     *
     * @return The value of the string or null if not found
     */
    public final String getIgnoreCase(String key)
    {
  
      if (null == key)
        return null;
  
      for (int i = 0; i < m_firstFree; i += 2)
      {
        if (m_map[i].equalsIgnoreCase(key))
          return m_map[i + 1];
      }
  
      return null;
    }
  
    /**
     * Tell if the table contains the given string in the value.
     *
     * @param val Value of the string to look up
     *
     * @return the string associated with the given value or null if not found
     */
    public final String getByValue(String val)
    {
  
      for (int i = 1; i < m_firstFree; i += 2)
      {
        if (m_map[i].equals(val))
          return m_map[i - 1];
      }
  
      return null;
    }
  
    /**
     * Get the nth element.
     *
     * @param i index of the string to look up.
     *
     * @return The string at the given index.
     */
    public final String elementAt(int i)
    {
      return m_map[i];
    }
  
    /**
     * Tell if the table contains the given string.
     *
     * @param key String to look up
     *
     * @return True if the given string is in this table 
     */
    public final boolean contains(String key)
    {
  
      for (int i = 0; i < m_firstFree; i += 2)
      {
        if (m_map[i].equals(key))
          return true;
      }
  
      return false;
    }
  
    /**
     * Tell if the table contains the given string.
     *
     * @param val value to look up
     *
     * @return True if the given value is in the table.
     */
    public final boolean containsValue(String val)
    {
  
      for (int i = 1; i < m_firstFree; i += 2)
      {
        if (m_map[i].equals(val))
          return true;
      }
  
      return false;
    }
  }
  