| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.camel.dataformat.protobuf; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.lang.reflect.Method; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import com.google.protobuf.Message; |
| import com.google.protobuf.Message.Builder; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.CamelException; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.InvalidPayloadException; |
| import org.apache.camel.spi.DataFormat; |
| import org.apache.camel.util.ObjectHelper; |
| |
| |
| public class ProtobufDataFormat implements DataFormat { |
| |
| private Message defaultInstance; |
| private String instanceClassName; |
| |
| |
| /** |
| * @param defaultInstance |
| */ |
| public ProtobufDataFormat(Message defaultInstance) { |
| this.defaultInstance = defaultInstance; |
| } |
| |
| public ProtobufDataFormat() { |
| } |
| |
| public void setDefaultInstace(Message instance) { |
| this.defaultInstance = instance; |
| } |
| |
| public void setDefaultInstance(Object instance) { |
| if (instance instanceof Message) { |
| this.defaultInstance = (Message) instance; |
| } else { |
| throw new IllegalArgumentException("The argument for setDefaultInstance should be subClass of com.google.protobuf.Message"); |
| } |
| } |
| |
| public synchronized Message getInstance(Exchange exchange) throws Exception { |
| if (defaultInstance == null) { |
| if (instanceClassName == null) { |
| throw new CamelException("There is not defaultInstance for protobuf unmarshaling"); |
| } else { |
| defaultInstance = loadDefaultInstance(instanceClassName, exchange.getContext()); |
| } |
| } |
| return defaultInstance; |
| } |
| |
| public void setInstanceClass(String className) throws Exception { |
| ObjectHelper.notNull(className, "ProtobufDataFormat instaceClass"); |
| instanceClassName = className; |
| } |
| |
| protected Message loadDefaultInstance(String className, CamelContext context) throws CamelException, ClassNotFoundException { |
| Class<?> instanceClass = context.getClassResolver().resolveMandatoryClass(className); |
| if (Message.class.isAssignableFrom(instanceClass)) { |
| try { |
| Method method = instanceClass.getMethod("getDefaultInstance", new Class[0]); |
| return (Message) method.invoke(null, new Object[0]); |
| } catch (Exception ex) { |
| throw new CamelException("Can't set the defaultInstance of ProtobufferDataFormat with " |
| + className + ", caused by " + ex); |
| } |
| } else { |
| throw new CamelException("Can't set the defaultInstance of ProtobufferDataFormat with " |
| + className + ", as the class is not a subClass of com.google.protobuf.Message"); |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.apache.camel.spi.DataFormat#marshal(org.apache.camel.Exchange, |
| * java.lang.Object, java.io.OutputStream) |
| */ |
| public void marshal(Exchange exchange, Object graph, OutputStream outputStream) throws Exception { |
| ((Message)graph).writeTo(outputStream); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.apache.camel.spi.DataFormat#unmarshal(org.apache.camel.Exchange, |
| * java.io.InputStream) |
| */ |
| public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception { |
| Message instance = getInstance(exchange); |
| Builder builder = instance.newBuilderForType().mergeFrom(inputStream); |
| if (!builder.isInitialized()) { |
| // TODO which exception should be thrown here? |
| throw new InvalidPayloadException(exchange, instance.getClass()); |
| } |
| |
| return builder.build(); |
| } |
| |
| } |