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.RuntimeCamelException;
022    import org.apache.camel.TypeConverter;
023    import org.apache.camel.util.ObjectHelper;
024    
025    /**
026     * A {@link TypeConverter} implementation which instantiates an object
027     * so that an instance method can be used as a type converter
028     *
029     * @version $Revision: 37863 $
030     */
031    public class InstanceMethodTypeConverter implements TypeConverter {
032        private final CachingInjector injector;
033        private final Method method;
034    
035        public InstanceMethodTypeConverter(CachingInjector injector, Method method) {
036            this.injector = injector;
037            this.method = method;
038        }
039    
040        @Override
041        public String toString() {
042            return "InstanceMethodTypeConverter: " + method;
043        }
044    
045        public synchronized <T> T convertTo(Class<T> type, Object value) {
046            Object instance = injector.newInstance();
047            if (instance == null) {
048                throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getName());
049            }
050            return (T) ObjectHelper.invokeMethod(method, instance, value);
051        }
052    }