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.camel.impl.converter;
018
019import java.lang.reflect.Method;
020
021import org.apache.camel.Exchange;
022import org.apache.camel.RuntimeCamelException;
023import org.apache.camel.support.TypeConverterSupport;
024import org.apache.camel.util.ObjectHelper;
025
026/**
027 * A type converter which is used to convert from String to enum type
028 */
029public class EnumTypeConverter extends TypeConverterSupport {
030
031    @SuppressWarnings("unchecked")
032    public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
033        if (type.isEnum()) {
034            String text = value.toString();
035            Class<Enum> enumClass = (Class<Enum>) type;
036
037            // we want to match case insensitive for enums
038            for (Enum enumValue : enumClass.getEnumConstants()) {
039                if (enumValue.name().equalsIgnoreCase(text)) {
040                    return type.cast(enumValue);
041                }
042            }
043
044            // fallback to the JDK valueOf which is case-sensitive and throws exception if not found
045            Method method;
046            try {
047                method = type.getMethod("valueOf", String.class);
048            } catch (NoSuchMethodException e) {
049                throw new RuntimeCamelException("Could not find valueOf method on enum type: " + type.getName());
050            }
051            return (T) ObjectHelper.invokeMethod(method, null, text);
052        }
053        return null;
054    }
055
056}