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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 Number} and vice versa.
28   *
29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
30   */
31  public class NumberEditor extends AbstractPropertyEditor {
32      private static final Pattern DECIMAL = Pattern.compile("[-+]?[0-9]*\\.?[0-9]*(?:[Ee][-+]?[0-9]+)?");
33  
34      private static final Pattern HEXADECIMAL = Pattern.compile("0x[0-9a-fA-F]+");
35  
36      private static final Pattern OCTET = Pattern.compile("0[0-9][0-9]*");
37  
38      @Override
39      protected final String toText(Object value) {
40          return (value == null ? "" : value.toString());
41      }
42  
43      @Override
44      protected final Object toValue(String text) throws IllegalArgumentException {
45          if (text.length() == 0) {
46              return defaultValue();
47          }
48  
49          if (HEXADECIMAL.matcher(text).matches()) {
50              return toValue(text.substring(2), 16);
51          }
52  
53          if (OCTET.matcher(text).matches()) {
54              return toValue(text, 8);
55          }
56  
57          if (DECIMAL.matcher(text).matches()) {
58              return toValue(text, 10);
59          }
60  
61          throw new NumberFormatException("Not a number: " + text);
62      }
63  
64      protected Object toValue(String text, int radix) {
65          return Integer.parseInt(text, radix);
66      }
67  
68      @Override
69      protected Object defaultValue() {
70          return Integer.valueOf(0);
71      }
72  }