001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * 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, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.impl.converter;
019    
020    import org.apache.camel.RuntimeCamelException;
021    import org.apache.camel.TypeConverter;
022    import org.apache.camel.util.ObjectHelper;
023    import org.apache.camel.impl.CachingInjector;
024    
025    import java.lang.reflect.InvocationTargetException;
026    import java.lang.reflect.Method;
027    
028    /**
029     * A {@link TypeConverter} implementation which instantiates an object
030     * so that an instance method can be used as a type converter
031     *
032     * @version $Revision: 525236 $
033     */
034    public class InstanceMethodTypeConverter implements TypeConverter {
035        private final CachingInjector injector;
036        private final Method method;
037    
038        public InstanceMethodTypeConverter(CachingInjector injector, Method method) {
039            this.injector = injector;
040            this.method = method;
041        }
042    
043        @Override
044        public String toString() {
045            return "InstanceMethodTypeConverter: " + method;
046        }
047    
048        public synchronized <T> T convertTo(Class<T> type, Object value) {
049            Object instance = injector.newInstance();
050            if (instance == null) {
051                throw new RuntimeCamelException("Could not instantiate aninstance of: " + type.getName());
052            }
053            return (T) ObjectHelper.invokeMethod(method, instance, value);
054        }
055    }