| /* |
| * 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.nifi.persistence; |
| |
| import org.apache.nifi.controller.serialization.FlowSerializationException; |
| import org.apache.nifi.web.api.dto.TemplateDTO; |
| |
| import javax.xml.bind.JAXBContext; |
| import javax.xml.bind.JAXBException; |
| import javax.xml.bind.Marshaller; |
| import java.io.BufferedOutputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| public final class TemplateSerializer { |
| |
| private static final JAXBContext jaxbContext; |
| |
| static { |
| try { |
| jaxbContext = JAXBContext.newInstance(TemplateDTO.class); |
| } catch (final JAXBException e) { |
| throw new RuntimeException("Cannot create JAXBContext for serializing templates", e); |
| } |
| } |
| |
| /** |
| * This method when called assumes the Framework Nar ClassLoader is in the |
| * classloader hierarchy of the current context class loader. |
| * @param dto the template dto to serialize |
| * @return serialized representation of the DTO |
| */ |
| public static byte[] serialize(final TemplateDTO dto) { |
| try { |
| final ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| final BufferedOutputStream bos = new BufferedOutputStream(baos); |
| |
| final Marshaller marshaller = jaxbContext.createMarshaller(); |
| marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE); |
| marshaller.marshal(dto, bos); |
| |
| bos.flush(); |
| return baos.toByteArray(); //Note: For really large templates this could use a lot of heap space |
| } catch (final IOException | JAXBException e) { |
| throw new FlowSerializationException(e); |
| } |
| } |
| |
| } |