Identifier


1   /*
2   
3   This software is OSI Certified Open Source Software.
4   OSI Certified is a certification mark of the Open Source Initiative.
5   
6   The license (Mozilla version 1.0) can be read at the MMBase site.
7   See http://www.MMBase.org/license
8   
9   */
10  package org.mmbase.util.transformers;
11  
12  import java.io.Reader  ;
13  import java.io.Writer  ;
14  
15  import org.mmbase.util.logging.*;
16  
17  /**
18   * Transforms strings to identifiers, replacing punctuation and whitespace with
19   * underscores.
20   *
21   * @author Pierre van Rooden
22   * @since MMBase-1.7
23   * @version $Id: Identifier.java,v 1.3 2004/07/09 20:38:42 michiel Exp $
24   */
25  
26  public class Identifier extends ReaderTransformer implements CharTransformer {
27      private static Logger log = Logging.getLoggerInstance(Identifier.class);
28  
29      public Writer   transform(Reader   r, Writer   w) {
30          try {
31              log.debug("Starting identifier");
32              while (true) {
33                  int c = r.read();
34                  if (c == -1) break;
35                  if (Character.isLetterOrDigit((char)c)) {
36                      w.write((char)c);
37                  } else {
38                      w.write('_');
39                  }
40              }
41              log.debug("Finished identifier");
42          } catch (java.io.IOException   e) {
43              log.error(e.toString());
44          }
45          return w;
46      }
47  
48      public String   toString() {
49          return "IDENTIFIER";
50      }
51  }
52

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