001/*
002 * Copyright 2020 Global Biodiversity Information Facility (GBIF)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.gbif.api;
017
018import java.io.IOException;
019
020import com.fasterxml.jackson.annotation.JsonInclude;
021import com.fasterxml.jackson.databind.DeserializationFeature;
022import com.fasterxml.jackson.databind.ObjectMapper;
023import com.fasterxml.jackson.databind.SerializationFeature;
024
025import static org.junit.jupiter.api.Assertions.assertEquals;
026
027public class SerdeTestUtils {
028
029  private static final ObjectMapper MAPPER = new ObjectMapper();
030
031  static {
032    // copied from common-ws JacksonJsonContextResolver to provide the same mapper configs
033    MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
034    MAPPER.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
035    MAPPER.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
036    // extra for better debugging
037    MAPPER.enable(SerializationFeature.INDENT_OUTPUT);
038  }
039
040  /**
041   * Does a roundtrip from object to JSON and back to another object and then compares the 2 instances
042   * and their hashcodes.
043   *
044   * @return JSON string of the serialized object
045   */
046  public static <T> String testSerDe(T obj, Class<T> objClass) throws IOException {
047    String json = MAPPER.writeValueAsString(obj);
048    T obj2 = MAPPER.readValue(json, objClass);
049    assertEquals(obj2, obj);
050    assertEquals(obj.hashCode(), obj2.hashCode());
051    return json;
052  }
053
054  public static String serialize(Object obj) throws IOException {
055    return MAPPER.writeValueAsString(obj);
056  }
057
058  public static <T> T deserialize(String json, Class<T> objClass) throws IOException {
059    return MAPPER.readValue(json, objClass);
060  }
061
062  private SerdeTestUtils() {
063    throw new UnsupportedOperationException("Can't initialize class");
064  }
065
066}