| /* |
| * 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.onlab.onos.codec; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Abstraction of a codec capable for encoding/decoding arbitrary objects to/from JSON. |
| */ |
| public abstract class JsonCodec<T> { |
| |
| /** |
| * Encodes the specified entity into JSON. |
| * |
| * @param entity entity to encode |
| * @param mapper object mapper |
| * @return JSON node |
| * @throws java.lang.UnsupportedOperationException if the codec does not |
| * support encode operations |
| */ |
| public abstract ObjectNode encode(T entity, ObjectMapper mapper); |
| |
| /** |
| * Decodes the specified entity from JSON. |
| * |
| * @param json JSON to decode |
| * @return decoded entity |
| * @throws java.lang.UnsupportedOperationException if the codec does not |
| * support decode operations |
| */ |
| public abstract T decode(ObjectNode json); |
| |
| /** |
| * Encodes the collection of the specified entities. |
| * |
| * @param entities collection of entities to encode |
| * @param mapper object mapper |
| * @return JSON array |
| * @throws java.lang.UnsupportedOperationException if the codec does not |
| * support encode operations |
| */ |
| public ArrayNode encode(Iterable<T> entities, ObjectMapper mapper) { |
| ArrayNode result = mapper.createArrayNode(); |
| for (T entity : entities) { |
| result.add(encode(entity, mapper)); |
| } |
| return result; |
| } |
| |
| /** |
| * Decodes the specified JSON array into a collection of entities. |
| * |
| * @param json JSON array to decode |
| * @return collection of decoded entities |
| * @throws java.lang.UnsupportedOperationException if the codec does not |
| * support decode operations |
| */ |
| public List<T> decode(ArrayNode json) { |
| List<T> result = new ArrayList<>(); |
| for (JsonNode node : json) { |
| result.add(decode((ObjectNode) node)); |
| } |
| return result; |
| } |
| |
| } |