001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 */
017package org.apache.xbean.propertyeditor;
018
019import java.lang.reflect.Method;
020
021/**
022 * @version $Rev$ $Date$
023 */
024public class EnumConverter extends AbstractConverter {
025
026    public EnumConverter(Class type) {
027        super(type);
028    }
029
030    @Override
031    protected String toStringImpl(final Object value) {
032        return Enum.class.cast(value).name();
033    }
034
035    @Override
036    protected Object toObjectImpl(String text) {
037        Class type = getType();
038
039        try {
040            return Enum.valueOf(type, text);
041        } catch (Exception cause) {
042            try {
043                final int index = Integer.parseInt(text);
044                final Method method = type.getMethod("values");
045                final Object[] values = (Object[]) method.invoke(null);
046                return values[index];
047            } catch (final NumberFormatException e) {
048                // no-op
049            } catch (final Exception e) {
050                cause = e;
051            }
052
053            throw new PropertyEditorException("Value \"" + text + "\" cannot be converted to enum type " + type.getName(), cause);
054        }
055    }
056}