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Object mapper for the CQL Java Driver.

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/*
 * Copyright DataStax, Inc.
 *
 * 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.datastax.driver.mapping;

import com.datastax.driver.core.CodecRegistry;
import com.datastax.driver.core.ProtocolVersion;
import com.datastax.driver.core.TypeCodec;
import com.datastax.driver.core.UserType;
import java.nio.ByteBuffer;
import java.util.Map;

/** Serializes a class annotated with {@code @UDT} to the corresponding CQL user-defined type. */
class MappedUDTCodec extends TypeCodec.AbstractUDTCodec {
  private final UserType cqlUserType;
  private final Class udtClass;
  private final Map columnMappers;
  private final CodecRegistry codecRegistry;

  MappedUDTCodec(
      UserType cqlUserType,
      Class udtClass,
      Map columnMappers,
      MappingManager mappingManager) {
    super(cqlUserType, udtClass);
    this.cqlUserType = cqlUserType;
    this.udtClass = udtClass;
    this.columnMappers = columnMappers;
    this.codecRegistry =
        mappingManager.getSession().getCluster().getConfiguration().getCodecRegistry();
  }

  @Override
  protected T newInstance() {
    return ReflectionUtils.newInstance(udtClass);
  }

  Class getUdtClass() {
    return udtClass;
  }

  @Override
  protected ByteBuffer serializeField(T source, String fieldName, ProtocolVersion protocolVersion) {
    @SuppressWarnings("unchecked")
    AliasedMappedProperty aliasedMappedProperty = columnMappers.get(fieldName);

    if (aliasedMappedProperty == null) return null;

    Object value = aliasedMappedProperty.mappedProperty.getValue(source);

    TypeCodec