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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  }