StringToIntTable


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  /*
17   * $Id: StringToIntTable.java,v 1.6 2004/02/17 04:21:14 minchau Exp $
18   */
19  package org.apache.xml.utils;
20  
21  /**
22   * A very simple lookup table that stores a list of strings, the even
23   * number strings being keys, and the odd number strings being values.
24   * @xsl.usage internal
25   */
26  public class StringToIntTable
27  {
28  
29    public static final int INVALID_KEY = -10000;
30    
31    /** Block size to allocate          */
32    private int m_blocksize;
33  
34    /** Array of strings this table points to. Associated with ints
35     * in m_values         */
36    private String   m_map[];
37  
38    /** Array of ints this table points. Associated with strings from
39     * m_map.         */
40    private int m_values[];
41  
42    /** Number of ints in the table          */
43    private int m_firstFree = 0;
44  
45    /** Size of this table         */
46    private int m_mapSize;
47  
48    /**
49     * Default constructor.  Note that the default
50     * block size is very small, for small lists.
51     */
52    public StringToIntTable()
53    {
54  
55      m_blocksize = 8;
56      m_mapSize = m_blocksize;
57      m_map = new String  [m_blocksize];
58      m_values = new int[m_blocksize];
59    }
60  
61    /**
62     * Construct a StringToIntTable, using the given block size.
63     *
64     * @param blocksize Size of block to allocate
65     */
66    public StringToIntTable(int blocksize)
67    {
68  
69      m_blocksize = blocksize;
70      m_mapSize = blocksize;
71      m_map = new String  [blocksize];
72      m_values = new int[m_blocksize];
73    }
74  
75    /**
76     * Get the length of the list.
77     *
78     * @return the length of the list 
79     */
80    public final int getLength()
81    {
82      return m_firstFree;
83    }
84  
85    /**
86     * Append a string onto the vector.
87     *
88     * @param key String to append
89     * @param value The int value of the string
90     */
91    public final void put(String   key, int value)
92    {
93  
94      if ((m_firstFree + 1) >= m_mapSize)
95      {
96        m_mapSize += m_blocksize;
97  
98        String   newMap[] = new String  [m_mapSize];
99  
100       System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1);
101 
102       m_map = newMap;
103 
104       int newValues[] = new int[m_mapSize];
105 
106       System.arraycopy(m_values, 0, newValues, 0, m_firstFree + 1);
107 
108       m_values = newValues;
109     }
110 
111     m_map[m_firstFree] = key;
112     m_values[m_firstFree] = value;
113 
114     m_firstFree++;
115   }
116 
117   /**
118    * Tell if the table contains the given string.
119    *
120    * @param key String to look for
121    *
122    * @return The String's int value
123    * 
124    */
125   public final int get(String   key)
126   {
127 
128     for (int i = 0; i < m_firstFree; i++)
129     {
130       if (m_map[i].equals(key))
131         return m_values[i];
132     }
133 
134     return INVALID_KEY;
135   }
136 
137   /**
138    * Tell if the table contains the given string. Ignore case.
139    *
140    * @param key String to look for
141    *
142    * @return The string's int value
143    */
144   public final int getIgnoreCase(String   key)
145   {
146 
147     if (null == key)
148         return INVALID_KEY;
149 
150     for (int i = 0; i < m_firstFree; i++)
151     {
152       if (m_map[i].equalsIgnoreCase(key))
153         return m_values[i];
154     }
155 
156     return INVALID_KEY;
157   }
158 
159   /**
160    * Tell if the table contains the given string.
161    *
162    * @param key String to look for
163    *
164    * @return True if the string is in the table
165    */
166   public final boolean contains(String   key)
167   {
168 
169     for (int i = 0; i < m_firstFree; i++)
170     {
171       if (m_map[i].equals(key))
172         return true;
173     }
174 
175     return false;
176   }
177   
178   /**
179    * Return array of keys in the table.
180    * 
181    * @return Array of strings
182    */
183   public final String  [] keys()
184   {
185     String   [] keysArr = new String  [m_firstFree];
186 
187     for (int i = 0; i < m_firstFree; i++)
188     {
189       keysArr[i] = m_map[i];
190     }
191 
192     return keysArr;
193   }  
194 }
195
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