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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  
39      private final Set<Enum> enums;
40  
41      public EnumEditor(Class enumType) {
42          if (enumType == null) {
43              throw new IllegalArgumentException("enumType");
44          }
45  
46          this.enumType = enumType;
47          this.enums = EnumSet.allOf(enumType);
48      }
49  
50      @Override
51      protected String toText(Object value) {
52          return (value == null ? "" : value.toString());
53      }
54  
55      @Override
56      protected Object toValue(String text) throws IllegalArgumentException {
57          if (ORDINAL.matcher(text).matches()) {
58              int ordinal = Integer.parseInt(text);
59              for (Enum e : enums) {
60                  if (e.ordinal() == ordinal) {
61                      return e;
62                  }
63              }
64  
65              throw new IllegalArgumentException("wrong ordinal: " + ordinal);
66          }
67  
68          for (Enum e : enums) {
69              if (text.equalsIgnoreCase(e.toString())) {
70                  return e;
71              }
72          }
73  
74          return Enum.valueOf(enumType, text);
75      }
76  }