content: /*
   * 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 com.datastax.oss.driver.internal.core.type.codec.extras.enums;
  
  import com.datastax.oss.driver.api.core.type.codec.MappingCodec;
  import com.datastax.oss.driver.api.core.type.codec.TypeCodecs;
  import com.datastax.oss.driver.api.core.type.reflect.GenericType;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.util.Objects;
  import net.jcip.annotations.Immutable;
  
  /**
   * A codec that serializes {@link Enum} instances as CQL {@code int}s representing their ordinal
   * values as returned by {@link Enum#ordinal()}.
   *
   * <p><strong>Note that this codec relies on the enum constants declaration order; it is therefore
   * vital that this order remains immutable.</strong>
   *
   * @param <EnumT> The Enum class this codec serializes from and deserializes to.
   */
  @Immutable
  public class EnumOrdinalCodec<EnumT extends Enum<EnumT>> extends MappingCodec<Integer, EnumT> {
  
    private final EnumT[] enumConstants;
  
    public EnumOrdinalCodec(@NonNull Class<EnumT> enumClass) {
      super(
          TypeCodecs.INT,
          GenericType.of(Objects.requireNonNull(enumClass, "enumClass must not be null")));
      this.enumConstants = enumClass.getEnumConstants();
    }
  
    @Nullable
    @Override
    protected EnumT innerToOuter(@Nullable Integer value) {
      return value == null ? null : enumConstants[value];
    }
  
    @Nullable
    @Override
    protected Integer outerToInner(@Nullable EnumT value) {
      return value == null ? null : value.ordinal();
    }
  }
  