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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  }