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Miscellaneous Utilities (Pure Java)

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/*
 * Copyright (c) 2019 by Andrew Charneski.
 *
 * The author 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.simiacryptus.util;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import de.javakaffee.kryoserializers.EnumMapSerializer;
import de.javakaffee.kryoserializers.EnumSetSerializer;
import de.javakaffee.kryoserializers.KryoReflectionFactorySupport;

import javax.annotation.Nonnull;
import java.util.EnumMap;
import java.util.EnumSet;

public class KryoUtil {

  private static final ThreadLocal threadKryo = new ThreadLocal() {

    @Nonnull
    @Override
    protected Kryo initialValue() {
      return new KryoReflectionFactorySupport() {

        @Override
        public Serializer getDefaultSerializer(@Nonnull @SuppressWarnings("rawtypes") final Class clazz) {
          if (EnumSet.class.isAssignableFrom(clazz)) {
            return new EnumSetSerializer();
          }
          if (EnumMap.class.isAssignableFrom(clazz)) {
            return new EnumMapSerializer();
          }
          //          if (serializer instanceof FieldSerializer) {
          //            ((FieldSerializer) serializer).setCopyTransient(false);
          //          }
          return super.getDefaultSerializer(clazz);
        }
      };
    }
  };

  public static Kryo kryo() {
    return KryoUtil.threadKryo.get();
  }
}