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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.regex.Pattern;
24  
25  /**
26   * A {@link PropertyEditor} which converts a {@link String} into
27   * a {@link Character} and vice versa.
28   *
29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
30   */
31  public class CharacterEditor extends AbstractPropertyEditor {
32      private static final Pattern UNICODE = Pattern.compile("\\\\[uU][0-9a-fA-F]+");
33  
34      @Override
35      protected String toText(Object value) {
36          return String.valueOf(value);
37      }
38  
39      @Override
40      protected Object toValue(String text) throws IllegalArgumentException {
41          if (text.length() == 0) {
42              return Character.valueOf(Character.MIN_VALUE);
43          }
44  
45          if (UNICODE.matcher(text).matches()) {
46              return Character.valueOf((char) Integer.parseInt(text.substring(2)));
47          }
48  
49          if (text.length() != 1) {
50              throw new IllegalArgumentException("Too many characters: " + text);
51          }
52  
53          return Character.valueOf(text.charAt(0));
54      }
55  }