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}