/*
    * 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.syncope.core.provisioning.api.serialization;
  
  import com.fasterxml.jackson.core.Version;
  import com.fasterxml.jackson.core.type.TypeReference;
  import com.fasterxml.jackson.databind.SerializationFeature;
  import com.fasterxml.jackson.databind.json.JsonMapper;
  import com.fasterxml.jackson.databind.module.SimpleModule;
  import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
  import com.fasterxml.jackson.module.afterburner.AfterburnerModule;
  import org.identityconnectors.common.security.GuardedString;
  import org.identityconnectors.framework.common.objects.Attribute;
  import org.identityconnectors.framework.common.objects.AttributeDelta;
  import org.identityconnectors.framework.common.objects.SyncToken;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Helper class for serialization and deserialization of configuration objects (POJOs) in JSON.
   */
  public final class POJOHelper {
  
      private static final Logger LOG = LoggerFactory.getLogger(POJOHelper.class);
  
      private static final JsonMapper MAPPER;
  
      static {
          SimpleModule pojoModule = new SimpleModule("POJOModule", new Version(1, 0, 0, null, null, null));
          pojoModule.addSerializer(GuardedString.class, new GuardedStringSerializer());
          pojoModule.addSerializer(Attribute.class, new AttributeSerializer());
          pojoModule.addSerializer(AttributeDelta.class, new AttributeDeltaSerializer());
          pojoModule.addSerializer(SyncToken.class, new SyncTokenSerializer());
          pojoModule.addDeserializer(GuardedString.class, new GuardedStringDeserializer());
          pojoModule.addDeserializer(Attribute.class, new AttributeDeserializer());
          pojoModule.addDeserializer(AttributeDelta.class, new AttributeDeltaDeserializer());
          pojoModule.addDeserializer(SyncToken.class, new SyncTokenDeserializer());
  
          MAPPER = JsonMapper.builder().
                  addModule(pojoModule).
                  addModule(new JavaTimeModule()).
                  addModule(new AfterburnerModule()).
                  disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS).
                  build();
      }
  
      public static String serialize(final Object object) {
          String result = null;
  
          try {
              result = MAPPER.writeValueAsString(object);
          } catch (Exception e) {
              LOG.error("During serialization", e);
          }
  
          return result;
      }
  
      public static <T extends Object> String serialize(final T object, final TypeReference<T> reference) {
          String result = null;
  
          try {
              result = MAPPER.writerFor(reference).writeValueAsString(object);
          } catch (Exception e) {
              LOG.error("During serialization", e);
          }
  
          return result;
      }
  
      public static <T extends Object> T deserialize(final String serialized, final Class<T> reference) {
          T result = null;
  
          try {
              result = MAPPER.readValue(serialized, reference);
          } catch (Exception e) {
              LOG.error("During deserialization", e);
          }
  
          return result;
      }
  
      public static <T extends Object> T deserialize(final String serialized, final TypeReference<T> reference) {
         T result = null;
 
         try {
             result = MAPPER.readValue(serialized, reference);
         } catch (Exception e) {
             LOG.error("During deserialization", e);
         }
 
         return result;
     }
     
     public static <T extends Object> T convertValue(final Object value, final Class<T> reference) {
         T result = null;
 
         try {
             result = MAPPER.convertValue(value, reference);
         } catch (Exception e) {
             LOG.error("During conversion", e);
         }
 
         return result;
     }
 
     private POJOHelper() {
     }
 }