| /* |
| * 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.InputStreamReader; |
| import java.io.OutputStream; |
| import java.lang.reflect.Method; |
| import java.util.Map; |
| |
| import com.google.protobuf.Message; |
| import com.google.protobuf.Message.Builder; |
| import com.google.protobuf.util.JsonFormat; |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.CamelContextAware; |
| import org.apache.camel.CamelException; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.InvalidPayloadException; |
| import org.apache.camel.NoTypeConversionAvailableException; |
| import org.apache.camel.spi.DataFormat; |
| import org.apache.camel.spi.DataFormatName; |
| import org.apache.camel.spi.annotations.Dataformat; |
| import org.apache.camel.support.service.ServiceSupport; |
| import org.apache.camel.util.ObjectHelper; |
| import org.apache.camel.util.StringHelper; |
| import org.apache.commons.io.IOUtils; |
| |
| @Dataformat("protobuf") |
| public class ProtobufDataFormat extends ServiceSupport implements DataFormat, DataFormatName, CamelContextAware { |
| |
| public static final String CONTENT_TYPE_FORMAT_NATIVE = "native"; |
| public static final String CONTENT_TYPE_FORMAT_JSON = "json"; |
| |
| private static final String CONTENT_TYPE_HEADER_NATIVE = "application/octet-stream"; |
| private static final String CONTENT_TYPE_HEADER_JSON = "application/json"; |
| |
| private CamelContext camelContext; |
| private Message defaultInstance; |
| private String instanceClassName; |
| private boolean contentTypeHeader; |
| private String contentTypeFormat = CONTENT_TYPE_FORMAT_NATIVE; |
| |
| public ProtobufDataFormat() { |
| } |
| |
| public ProtobufDataFormat(Message defaultInstance) { |
| this.defaultInstance = defaultInstance; |
| } |
| |
| public ProtobufDataFormat(Message defaultInstance, String contentTypeFormat) { |
| this.defaultInstance = defaultInstance; |
| this.contentTypeFormat = contentTypeFormat; |
| } |
| |
| @Override |
| public String getDataFormatName() { |
| return "protobuf"; |
| } |
| |
| @Override |
| public CamelContext getCamelContext() { |
| return camelContext; |
| } |
| |
| @Override |
| public void setCamelContext(CamelContext camelContext) { |
| this.camelContext = camelContext; |
| } |
| |
| public void setDefaultInstance(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 void setInstanceClass(String className) throws Exception { |
| ObjectHelper.notNull(className, "ProtobufDataFormat instaceClass"); |
| instanceClassName = className; |
| } |
| |
| public void setContentTypeHeader(boolean contentTypeHeader) { |
| this.contentTypeHeader = contentTypeHeader; |
| } |
| |
| public boolean isContentTypeHeader() { |
| return contentTypeHeader; |
| } |
| |
| /* |
| * Defines a content type format in which protobuf message will be |
| * serialized/deserialized from(to) the Java been. It can be native protobuf |
| * format or json fields representation. The default value is 'native'. |
| */ |
| public void setContentTypeFormat(String contentTypeFormat) { |
| StringHelper.notEmpty(contentTypeFormat, "ProtobufDataFormat contentTypeFormat"); |
| this.contentTypeFormat = contentTypeFormat; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.apache.camel.spi.DataFormat#marshal(org.apache.camel.Exchange, |
| * java.lang.Object, java.io.OutputStream) |
| */ |
| @Override |
| public void marshal(final Exchange exchange, final Object graph, final OutputStream outputStream) throws Exception { |
| final Message inputMessage = convertGraphToMessage(exchange, graph); |
| |
| String contentTypeHeader = CONTENT_TYPE_HEADER_NATIVE; |
| if (contentTypeFormat.equals(CONTENT_TYPE_FORMAT_JSON)) { |
| IOUtils.write(JsonFormat.printer().print(inputMessage), outputStream, "UTF-8"); |
| contentTypeHeader = CONTENT_TYPE_HEADER_JSON; |
| } else if (contentTypeFormat.equals(CONTENT_TYPE_FORMAT_NATIVE)) { |
| inputMessage.writeTo(outputStream); |
| } else { |
| throw new CamelException("Invalid protobuf content type format: " + contentTypeFormat); |
| } |
| |
| if (isContentTypeHeader()) { |
| if (exchange.getMessage() != null) { |
| exchange.getMessage().setHeader(Exchange.CONTENT_TYPE, contentTypeHeader); |
| } else { |
| exchange.getIn().setHeader(Exchange.CONTENT_TYPE, contentTypeHeader); |
| } |
| } |
| } |
| |
| private Message convertGraphToMessage(final Exchange exchange, final Object inputData) throws NoTypeConversionAvailableException { |
| final Map<?, ?> messageInMap = exchange.getContext().getTypeConverter().tryConvertTo(Map.class, exchange, inputData); |
| if (messageInMap != null) { |
| //final ProtobufConverter protobufConverter = ProtobufConverter.create(defaultInstance); |
| return ProtobufConverter.toProto(messageInMap, defaultInstance); |
| } |
| return exchange.getContext().getTypeConverter().mandatoryConvertTo(Message.class, exchange, inputData); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.apache.camel.spi.DataFormat#unmarshal(org.apache.camel.Exchange, |
| * java.io.InputStream) |
| */ |
| @Override |
| public Object unmarshal(final Exchange exchange, final InputStream inputStream) throws Exception { |
| ObjectHelper.notNull(defaultInstance, "defaultInstance or instanceClassName must be set", this); |
| Builder builder = defaultInstance.newBuilderForType(); |
| |
| if (contentTypeFormat.equals(CONTENT_TYPE_FORMAT_JSON)) { |
| JsonFormat.parser().ignoringUnknownFields().merge(new InputStreamReader(inputStream), builder); |
| } else if (contentTypeFormat.equals(CONTENT_TYPE_FORMAT_NATIVE)) { |
| builder = defaultInstance.newBuilderForType().mergeFrom(inputStream); |
| } else { |
| throw new CamelException("Invalid protobuf content type format: " + contentTypeFormat); |
| } |
| |
| if (!builder.isInitialized()) { |
| // TODO which exception should be thrown here? |
| throw new InvalidPayloadException(exchange, defaultInstance.getClass()); |
| } |
| |
| return builder.build(); |
| } |
| |
| protected Message loadDefaultInstance(final String className, final CamelContext context) throws CamelException, ClassNotFoundException { |
| Class<?> instanceClass = context.getClassResolver().resolveMandatoryClass(className); |
| if (Message.class.isAssignableFrom(instanceClass)) { |
| try { |
| Method method = instanceClass.getMethod("getDefaultInstance"); |
| return (Message)method.invoke(null); |
| } catch (final 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"); |
| } |
| } |
| |
| @Override |
| protected void doStart() throws Exception { |
| if (defaultInstance == null && instanceClassName != null) { |
| defaultInstance = loadDefaultInstance(instanceClassName, getCamelContext()); |
| } |
| } |
| |
| @Override |
| protected void doStop() throws Exception { |
| // noop |
| } |
| |
| } |