smolnar82 commented on a change in pull request #263: [WIP] KNOX-2226 - Add home page to Knox URL: https://github.com/apache/knox/pull/263#discussion_r378901987
########## File path: knox-homepage-backend/src/main/java/org/apache/knox/homepage/TopologyInformationWrapperMarshaller.java ########## @@ -0,0 +1,89 @@ +/* + * 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.knox.homepage; + +import java.io.IOException; +import java.io.OutputStream; +import java.lang.annotation.Annotation; +import java.lang.reflect.Type; +import java.util.HashMap; +import java.util.Map; + +import javax.ws.rs.Produces; +import javax.ws.rs.WebApplicationException; +import javax.ws.rs.core.MediaType; +import javax.ws.rs.core.MultivaluedMap; +import javax.ws.rs.ext.MessageBodyWriter; +import javax.ws.rs.ext.Provider; +import javax.xml.bind.JAXBException; +import javax.xml.bind.Marshaller; + +import org.eclipse.persistence.jaxb.JAXBContextFactory; +import org.eclipse.persistence.jaxb.JAXBContextProperties; + +@Provider +@Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON }) +public class TopologyInformationWrapperMarshaller implements MessageBodyWriter<TopologyInformationWrapper> { + private static Marshaller xmlMarshaller; + private static Marshaller jsonMarshaller; + + @Override + public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { + return TopologyInformationWrapper.class == type; + } + + @Override + public long getSize(TopologyInformationWrapper t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { + return -1; + } + + @Override + public void writeTo(TopologyInformationWrapper instance, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, + MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException { + try { + getMarshaller(mediaType).marshal(instance, entityStream); + } catch (JAXBException e) { + throw new IOException(e); + } + } + + private Marshaller getMarshaller(MediaType mediaType) throws JAXBException { + return MediaType.APPLICATION_JSON_TYPE.getSubtype().equals(mediaType.getSubtype()) ? getJsonMarshaller() : getXmlMarshaller(); + } + + private synchronized Marshaller getXmlMarshaller() throws JAXBException { Review comment: This is the same pattern we have in `gateway-admin-ui`. I agree this should be enhanced but I believe it's out of the scope of this JIRA. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
