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1   package org.apache.commons.digester3.xmlrules;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import org.apache.commons.digester3.Rule;
23  import org.xml.sax.Attributes;
24  
25  /**
26   * 
27   */
28  class PatternRule
29      extends Rule
30  {
31  
32      private final String attributeName;
33  
34      private final PatternStack patternStack;
35  
36      private String pattern;
37  
38      public PatternRule( PatternStack patternStack )
39      {
40          this( "value", patternStack );
41      }
42  
43      public PatternRule( String attributeName, PatternStack patternStack )
44      {
45          this.attributeName = attributeName;
46          this.patternStack = patternStack;
47      }
48  
49      /**
50       * {@inheritDoc}
51       */
52      @Override
53      public void begin( String namespace, String name, Attributes attributes )
54          throws Exception
55      {
56          this.pattern = attributes.getValue( this.attributeName );
57          if ( this.pattern != null )
58          {
59              this.patternStack.push( pattern );
60          }
61      }
62  
63      /**
64       * {@inheritDoc}
65       */
66      @Override
67      public void end( String namespace, String name )
68          throws Exception
69      {
70          if ( this.pattern != null )
71          {
72              this.patternStack.pop();
73          }
74      }
75  
76      /**
77       * @return
78       */
79      protected String getMatchingPattern()
80      {
81          return this.patternStack.toString();
82      }
83  
84  }