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 table that stores a list of StringToStringTables, optimized
   * for small lists.
   * @xsl.usage internal
   */
  public class StringToStringTableVector
  {
  
    /** Size of blocks to allocate         */
    private int m_blocksize;
  
    /** Array of StringToStringTable objects          */
    private StringToStringTable m_map[];
  
    /** Number of StringToStringTable objects in this array          */
    private int m_firstFree = 0;
  
    /** Size of this array          */
    private int m_mapSize;
  
    /**
     * Default constructor.  Note that the default
     * block size is very small, for small lists.
     */
    public StringToStringTableVector()
    {
  
      m_blocksize = 8;
      m_mapSize = m_blocksize;
      m_map = new StringToStringTable[m_blocksize];
    }
  
    /**
     * Construct a StringToStringTableVector, using the given block size.
     *
     * @param blocksize Size of blocks to allocate 
     */
    public StringToStringTableVector(int blocksize)
    {
  
      m_blocksize = blocksize;
      m_mapSize = blocksize;
      m_map = new StringToStringTable[blocksize];
    }
  
    /**
     * Get the length of the list.
     *
     * @return Number of StringToStringTable objects in the list
     */
    public final int getLength()
    {
      return m_firstFree;
    }
  
    /**
     * Get the length of the list.
     *
     * @return Number of StringToStringTable objects in the list
     */
    public final int size()
    {
      return m_firstFree;
    }
  
    /**
     * Append a StringToStringTable object onto the vector.
     *
     * @param value StringToStringTable object to add
     */
    public final void addElement(StringToStringTable value)
    {
  
      if ((m_firstFree + 1) >= m_mapSize)
      {
        m_mapSize += m_blocksize;
  
        StringToStringTable newMap[] = new StringToStringTable[m_mapSize];
  
        System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1);
  
        m_map = newMap;
      }
  
      m_map[m_firstFree] = value;
  
      m_firstFree++;
    }
  
    /**
     * Given a string, find the last added occurance value
     * that matches the key.
     *
     * @param key String to look up
     *
     * @return the last added occurance value that matches the key
     * or null if not found.
     */
    public final String get(String key)
    {
  
      for (int i = m_firstFree - 1; i >= 0; --i)
      {
        String nsuri = m_map[i].get(key);
  
        if (nsuri != null)
          return nsuri;
      }
  
      return null;
    }
  
    /**
     * Given a string, find out if there is a value in this table
     * that matches the key.
     *
     * @param key String to look for  
     *
     * @return True if the string was found in table, null if not
     */
    public final boolean containsKey(String key)
    {
  
      for (int i = m_firstFree - 1; i >= 0; --i)
      {
        if (m_map[i].get(key) != null)
          return true;
      }
  
      return false;
    }
  
    /**
     * Remove the last element.
     */
    public final void removeLastElem()
    {
  
      if (m_firstFree > 0)
      {
        m_map[m_firstFree] = null;
  
        m_firstFree--;
      }
    }
  
    /**
     * Get the nth element.
     *
     * @param i Index of element to find
     *
     * @return The StringToStringTable object at the given index
     */
    public final StringToStringTable elementAt(int i)
    {
      return m_map[i];
    }
  
    /**
     * Tell if the table contains the given StringToStringTable.
     *
     * @param s The StringToStringTable to find
     *
     * @return True if the StringToStringTable is found
     */
    public final boolean contains(StringToStringTable s)
    {
  
      for (int i = 0; i < m_firstFree; i++)
      {
        if (m_map[i].equals(s))
          return true;
      }
  
      return false;
    }
  }
  