/*
    *    Copyright 2010-2026 the original author or authors.
    *
    *    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
    *
    *       https://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.mybatis.caches.ehcache;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.nio.ByteBuffer;
  
  import org.ehcache.spi.serialization.Serializer;
  import org.ehcache.spi.serialization.SerializerException;
  
  /**
   * Ehcache 3 {@link Serializer} that uses standard Java serialization. This serializer is required when off-heap or
   * disk-based storage tiers are used, since those tiers cannot store object references directly.
   * <p>
   * Note: heap-only caches do not need serialization; this class is provided for configurations that add off-heap or disk
   * tiers.
   * </p>
   */
  public class ObjectSerializer implements Serializer<Object> {
  
    /**
     * Constructor required by Ehcache 3's serializer contract.
     *
     * @param loader
     *          the class loader to use when deserialising objects
     */
    public ObjectSerializer(ClassLoader loader) {
      // class loader is not used; standard ObjectInputStream resolves classes through the context class loader
    }
  
    @Override
    public ByteBuffer serialize(Object object) throws SerializerException {
      try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
          ObjectOutputStream oos = new ObjectOutputStream(baos)) {
        oos.writeObject(object);
        oos.flush();
        return ByteBuffer.wrap(baos.toByteArray());
      } catch (IOException e) {
        throw new SerializerException("Failed to serialize object", e);
      }
    }
  
    @Override
    public Object read(ByteBuffer binary) throws ClassNotFoundException, SerializerException {
      byte[] bytes = new byte[binary.remaining()];
      binary.get(bytes);
      try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytes))) {
        return ois.readObject();
      } catch (IOException e) {
        throw new SerializerException("Failed to deserialize object", e);
      }
    }
  
    @Override
    public boolean equals(Object object, ByteBuffer binary) throws ClassNotFoundException, SerializerException {
      return object.equals(read(binary));
    }
  
  }