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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  }