Java tutorial
/* * 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 * * 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.streams.data; import com.fasterxml.jackson.databind.AnnotationIntrospector; import com.fasterxml.jackson.databind.DeserializationFeature; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; import com.fasterxml.jackson.module.jaxb.JaxbAnnotationIntrospector; import com.moreover.api.Article; import org.apache.commons.lang.NotImplementedException; import org.apache.streams.data.util.MoreoverUtils; import org.apache.streams.pojo.json.Activity; import java.io.IOException; import java.util.List; /** * Deserializes Moreover JSON format into Activities */ public class MoreoverJsonActivitySerializer implements ActivitySerializer<String> { public MoreoverJsonActivitySerializer() { } @Override public String serializationFormat() { return "application/json+vnd.moreover.com.v1"; } @Override public String serialize(Activity deserialized) { throw new UnsupportedOperationException("Cannot currently serialize to Moreover JSON"); } @Override public Activity deserialize(String serialized) { serialized = serialized.replaceAll("\\[[ ]*\\]", "null"); System.out.println(serialized); ObjectMapper mapper = new ObjectMapper(); AnnotationIntrospector introspector = new JaxbAnnotationIntrospector(mapper.getTypeFactory()); mapper.setAnnotationIntrospector(introspector); mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, Boolean.FALSE); mapper.configure(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE, Boolean.FALSE); mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, Boolean.TRUE); mapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, Boolean.TRUE); mapper.configure(DeserializationFeature.WRAP_EXCEPTIONS, Boolean.TRUE); Article article; try { ObjectNode node = (ObjectNode) mapper.readTree(serialized); node.remove("tags"); node.remove("locations"); node.remove("companies"); node.remove("topics"); node.remove("media"); node.remove("outboundUrls"); ObjectNode jsonNodes = (ObjectNode) node.get("source").get("feed"); jsonNodes.remove("editorialTopics"); jsonNodes.remove("tags"); jsonNodes.remove("autoTopics"); article = mapper.convertValue(node, Article.class); } catch (IOException e) { throw new IllegalArgumentException("Unable to deserialize", e); } return MoreoverUtils.convert(article); } @Override public List<Activity> deserializeAll(List<String> serializedList) { throw new NotImplementedException("Not currently implemented"); } }