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     */
017    package org.apache.camel.impl.converter;
018    
019    import java.lang.reflect.Method;
020    
021    import org.apache.camel.Exchange;
022    import org.apache.camel.RuntimeCamelException;
023    import org.apache.camel.TypeConverter;
024    import org.apache.camel.util.ObjectHelper;
025    
026    /**
027     * A {@link TypeConverter} implementation which instantiates an object
028     * so that an instance method can be used as a type converter
029     *
030     * @version $Revision: 1092 $
031     */
032    public class InstanceMethodTypeConverter implements TypeConverter {
033        private final CachingInjector injector;
034        private final Method method;
035        private final boolean useExchange;
036    
037        public InstanceMethodTypeConverter(CachingInjector injector, Method method) {
038            this.injector = injector;
039            this.method = method;
040            this.useExchange = method.getParameterTypes().length == 2;
041        }
042    
043        @Override
044        public String toString() {
045            return "InstanceMethodTypeConverter: " + method;
046        }
047    
048        public <T> T convertTo(Class<T> type, Object value) {
049            return convertTo(type, null, value);
050        }
051    
052        public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
053            Object instance = injector.newInstance();
054            if (instance == null) {
055                throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getName());
056            }
057            return useExchange
058                ? (T)ObjectHelper.invokeMethod(method, instance, value, exchange) : (T)ObjectHelper
059                    .invokeMethod(method, instance, value);
060        }
061    }