RegexpReplacerFactory


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.util.*;
13  
14  import org.mmbase.util.logging.*;
15  import org.mmbase.util.functions.*;
16  
17  
18  /**
19   * Factories new instances of extensions of {@link RegexpReplacer}, for which the replace patterns
20   * are parameterized (using the 'patterns' parameter).
21   *
22   * @author Michiel Meeuwissen
23   * @since MMBase-1.8
24   */
25  
26  public class RegexpReplacerFactory implements ParameterizedTransformerFactory {
27      private static final Logger log = Logging.getLoggerInstance(RegexpReplacerFactory.class);
28  
29  
30      protected static final Parameter[] PARAMS = new Parameter[] {
31          new Parameter("patterns", Collection.class, Collections.EMPTY_LIST),
32          new Parameter("mode", String  .class),
33          new Parameter("replacefirst", String  .class)
34      };
35  
36      public Parameters createParameters() {
37          return new Parameters(PARAMS);
38      }
39  
40      /**
41       * Creates a parameterized transformer.
42       */
43      public Transformer createTransformer(final Parameters parameters) {
44          parameters.checkRequiredParameters();
45          if (log.isDebugEnabled()) {
46              log.debug("Creating transformer, with " + parameters);
47          }
48          RegexpReplacer trans = new RegexpReplacer() {
49                  private Collection patterns = new ArrayList();
50                  {
51                      addPatterns((Collection) parameters.get("patterns"), patterns);
52                  }
53                  public Collection getPatterns() {
54                      return patterns;
55                  }
56              };
57          String   mode = (String  ) parameters.get("mode");
58          if (mode == null) mode = "WORDS";
59          Config c = (Config)trans.transformers().get("REGEXPS_" + mode.toUpperCase());
60          if (c == null) c = (Config)trans.transformers().get(mode);
61          if (c == null) throw new IllegalArgumentException  ("" + mode + " cannot be found in " + trans.transformers());
62          String   firstParam = (String  ) parameters.get("replacefirst");
63          boolean replaceFirst = "true".equals(firstParam);
64          boolean replaceFirstAll = "all".equals(firstParam);
65          trans.configure(c.config + 
66                          (replaceFirst ? RegexpReplacer.REPLACE_FIRST : 0) + 
67                          (replaceFirstAll ? RegexpReplacer.REPLACE_FIRST_ALL : 0)
68                          );
69          return trans;
70      }
71  
72  
73  
74  
75  
76  }
77
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