content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.graphscope.common.jna;
  
  import com.sun.jna.FromNativeContext;
  import com.sun.jna.ToNativeContext;
  import com.sun.jna.TypeConverter;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class EnumConverter implements TypeConverter {
      private static final Logger logger = LoggerFactory.getLogger(EnumConverter.class);
  
      public Object fromNative(Object input, FromNativeContext context) {
          Integer i = (Integer) input;
          Class targetClass = context.getTargetType();
          if (!IntEnum.class.isAssignableFrom(targetClass)) {
              return null;
          }
          Object[] enums = targetClass.getEnumConstants();
          if (enums.length == 0) {
              logger.error(
                      "Could not convert desired enum type (), no valid values are defined.",
                      targetClass.getName());
              return null;
          }
          IntEnum instance = (IntEnum) enums[0];
          return instance.getEnum(i);
      }
  
      public Object toNative(Object input, ToNativeContext context) {
          if (input == null) {
              return new Integer(0);
          }
          IntEnum j = (IntEnum) input;
          return new Integer(j.getInt());
      }
  
      public Class nativeType() {
          return Integer.class;
      }
  }
  