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Object mapper for the DataStax CQL Java Driver.

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/*
 * Copyright (C) 2012-2017 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