001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.mina.integration.beans;
021
022import java.beans.PropertyEditor;
023import java.util.EnumSet;
024import java.util.Set;
025import java.util.regex.Pattern;
026
027/**
028 * A {@link PropertyEditor} which converts a {@link String} into
029 * an {@link Enum} and vice versa.
030 *
031 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
032 */
033@SuppressWarnings("unchecked")
034public class EnumEditor extends AbstractPropertyEditor {
035    private static final Pattern ORDINAL = Pattern.compile("[0-9]+");
036
037    private final Class enumType;
038
039    private final Set<Enum<?>> enums;
040
041    public EnumEditor(Class enumType) {
042        if (enumType == null) {
043            throw new IllegalArgumentException("enumType");
044        }
045
046        this.enumType = enumType;
047        this.enums = EnumSet.allOf(enumType);
048    }
049
050    @Override
051    protected String toText(Object value) {
052        return (value == null ? "" : value.toString());
053    }
054
055    @Override
056    protected Object toValue(String text) throws IllegalArgumentException {
057        if (ORDINAL.matcher(text).matches()) {
058            int ordinal = Integer.parseInt(text);
059            for (Enum<?> e : enums) {
060                if (e.ordinal() == ordinal) {
061                    return e;
062                }
063            }
064
065            throw new IllegalArgumentException("wrong ordinal: " + ordinal);
066        }
067
068        for (Enum<?> e : enums) {
069            if (text.equalsIgnoreCase(e.toString())) {
070                return e;
071            }
072        }
073
074        return Enum.valueOf(enumType, text);
075    }
076}