/*
    * 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.logging.log4j.core.appender.db.jpa.converter;
  
  import org.apache.logging.log4j.core.time.Instant;
  import org.apache.logging.log4j.core.time.MutableInstant;
  import org.apache.logging.log4j.status.StatusLogger;
  import org.apache.logging.log4j.util.Strings;
  
  import javax.persistence.AttributeConverter;
  import javax.persistence.Converter;
  
  /**
   * A JPA 2.1 attribute converter for {@link Instant}s in {@link org.apache.logging.log4j.core.LogEvent}s. This
   * converter is capable of converting both to and from {@link String}s.
   */
  @Converter(autoApply = false)
  public class InstantAttributeConverter implements AttributeConverter<Instant, String> {
      private static final StatusLogger LOGGER = StatusLogger.getLogger();
  
      @Override
      public String convertToDatabaseColumn(final Instant instant) {
          if (instant == null) {
              return null;
          }
          return instant.getEpochSecond() + "," + instant.getNanoOfSecond();
      }
  
      @Override
      public Instant convertToEntityAttribute(final String s) {
          if (Strings.isEmpty(s)) {
              return null;
          }
  
          int pos = s.indexOf(",");
          long epochSecond = Long.parseLong(s.substring(0, pos));
          int nanos = Integer.parseInt(s.substring(pos + 1, s.length()));
  
          MutableInstant result = new MutableInstant();
          result.initFromEpochSecond(epochSecond, nanos);
          return result;
      }
  }