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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.integration.beans;
21  
22  import java.beans.PropertyEditor;
23  import java.util.EnumSet;
24  import java.util.Set;
25  import java.util.regex.Pattern;
26  
27  /**
28   * A {@link PropertyEditor} which converts a {@link String} into
29   * an {@link Enum} and vice versa.
30   *
31   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
32   */
33  @SuppressWarnings("unchecked")
34  public class EnumEditor extends AbstractPropertyEditor {
35      private static final Pattern ORDINAL = Pattern.compile("[0-9]+");
36      
37      private final Class enumType;
38      private final Set<Enum> enums;
39  
40      public EnumEditor(Class enumType) {
41          if (enumType == null) {
42              throw new NullPointerException("enumType");
43          }
44          
45          this.enumType = enumType;
46          this.enums = EnumSet.allOf(enumType);
47      }
48  
49      @Override
50      protected String toText(Object value) {
51          return value.toString();
52      }
53  
54      @Override
55      protected Object toValue(String text) throws IllegalArgumentException {
56          if (ORDINAL.matcher(text).matches()) {
57              int ordinal = Integer.parseInt(text);
58              for (Enum e: enums) {
59                  if (e.ordinal() == ordinal) {
60                      return e;
61                  }
62              }
63              
64              throw new IllegalArgumentException("wrong ordinal: " + ordinal);
65          }
66          
67          for (Enum e: enums) {
68              if (text.equalsIgnoreCase(e.toString())) {
69                  return e;
70              }
71          }
72          
73          return Enum.valueOf(enumType, text);
74      }
75  }