StrParser


1   /**
2    * Copyright (C) 2003-2005 Funambol
3    *
4    * This program is free software; you can redistribute it and/or modify
5    * it under the terms of the GNU General Public License as published by
6    * the Free Software Foundation; either version 2 of the License, or
7    * (at your option) any later version.
8    *
9    * This program is distributed in the hope that it will be useful,
10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   * GNU General Public License for more details.
13   *
14   * You should have received a copy of the GNU General Public License
15   * along with this program; if not, write to the Free Software
16   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
17   */
18  
19  package sync4j.syncclient.sps.common.util;
20  
21  
22  /**
23   * This class implements string parser by parserDelimiter.
24   *
25   * @author  Fabio Maggi @ Funambol
26   * @version $Id: StrParser.java,v 1.3 2005/01/19 11:18:36 fabius Exp $
27   **/
28  public class StrParser {
29  
30      // ------------------------------------------------------------ Private data
31  
32      private int position;
33  
34      private String   str         = null;
35      private String   parserDelim = null;
36  
37      //------------------------------------------------------------- Constructors
38  
39      /**
40       * Constructs a string parser for the specified string by parserDelimiter.
41       *
42       * @param   str            string to be parsed
43       * @param   parserDelim    delimiter
44       **/
45      public StrParser(String   str, String   parserDelim) {
46  
47          position = 0;
48  
49          this.str = str;
50  
51          this.parserDelim = parserDelim;
52  
53      }
54  
55      //------------------------------------------------------------- Public methods
56  
57      /**
58       * Verify if available more elements about this StrParser.
59       *
60       * @return  <code>true</code> if available more elements.
61       *          <code>false</code> if not available more elements.
62       **/
63  
64      public boolean hasMoreElements() {
65  
66          //
67          // low performance
68          //
69          /**
70          if ((position <= str.length()-1) && ( str.substring(position).indexOf(parserDelim) != -1
71  
72               || str.substring(position).length() > 0)) {
73  
74              return true;
75  
76          } else {
77  
78              return false;
79  
80          }
81  
82          */
83  
84          //
85          //high performance
86          //
87          if (str.substring(position).indexOf(parserDelim) != -1
88  
89               || str.substring(position).length() > 0) {
90  
91              return true;
92  
93          } else {
94  
95              return false;
96  
97          }
98  
99      }
100 
101 
102     /**
103      * @return next element about this StrParser.
104      */
105     public String   nextElement() {
106 
107         int positionOld;
108 
109         int positionTmp;
110 
111         positionOld = position;
112 
113         positionTmp = str.substring(position).indexOf(parserDelim);
114 
115         if (positionTmp != -1) {
116 
117             position = position + positionTmp + parserDelim.length();
118 
119             return str.substring(positionOld, position - parserDelim.length());
120 
121         } else {
122 
123             position = str.length();
124 
125             return str.substring(positionOld, position);
126 
127         }
128 
129     }
130 
131 
132     /**
133      * @return number of elements about this StrParser.
134      */
135     public int countElements() {
136 
137         int count = 0;
138         int index = 0;
139 
140         String   strTmp = null;
141 
142         strTmp = str;
143 
144         while (strTmp != null && strTmp.length() > 0) {
145 
146             count++;
147 
148             index = strTmp.indexOf(parserDelim);
149 
150             if (index == -1) {
151                 break;
152             }
153 
154             strTmp = strTmp.substring(index + 1);
155 
156         }
157 
158         return count;
159 
160     }
161 
162 }
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