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.spi.TypeConverterRegistry;
025 import org.apache.camel.util.ObjectHelper;
026
027 /**
028 * A {@link org.apache.camel.TypeConverter} implementation which instantiates an object
029 * so that an instance method can be used as a fallback type converter
030 *
031 * @version $Revision: 747062 $
032 */
033 public class InstanceMethodFallbackTypeConverter implements TypeConverter {
034 private final CachingInjector injector;
035 private final Method method;
036 private final boolean useExchange;
037 private final TypeConverterRegistry registry;
038
039 public InstanceMethodFallbackTypeConverter(CachingInjector injector, Method method, TypeConverterRegistry registry) {
040 this.injector = injector;
041 this.method = method;
042 this.useExchange = method.getParameterTypes().length == 4;
043 this.registry = registry;
044 }
045
046 @Override
047 public String toString() {
048 return "InstanceMethodFallbackTypeConverter: " + method;
049 }
050
051 public <T> T convertTo(Class<T> type, Object value) {
052 return convertTo(type, null, value);
053 }
054
055 @SuppressWarnings("unchecked")
056 public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
057 Object instance = injector.newInstance();
058 if (instance == null) {
059 throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getCanonicalName());
060 }
061 return useExchange
062 ? (T)ObjectHelper.invokeMethod(method, instance, type, value, exchange, registry) : (T)ObjectHelper
063 .invokeMethod(method, instance, type, value, registry);
064 }
065 }