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Apache James Mailbox Deleted Messages Vault metadata on top of Cassandra
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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.vault.metadata;

import java.util.Optional;

import javax.inject.Inject;

import org.apache.james.vault.dto.DeletedMessageWithStorageInformationConverter;
import org.apache.james.vault.dto.DeletedMessageWithStorageInformationDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;

class MetadataSerializer {
    private static final Logger LOGGER = LoggerFactory.getLogger(MetadataSerializer.class);

    private final ObjectMapper objectMapper;
    private final DeletedMessageWithStorageInformationConverter dtoConverter;

    @Inject
    MetadataSerializer(DeletedMessageWithStorageInformationConverter dtoConverter) {
        this.dtoConverter = dtoConverter;
        this.objectMapper = new ObjectMapper()
            .registerModule(new Jdk8Module())
            .setSerializationInclusion(JsonInclude.Include.NON_ABSENT);
    }

    Optional deserialize(String payload) {
        return deserializeDto(payload)
            .flatMap(this::toDomainObject);
    }

    private Optional deserializeDto(String payload) {
        try {
            return Optional.of(objectMapper.readValue(payload, DeletedMessageWithStorageInformationDTO.class));
        } catch (Exception e) {
            LOGGER.error("Error deserializing JSON metadata", e);
            return Optional.empty();
        }
    }

    private Optional toDomainObject(DeletedMessageWithStorageInformationDTO dto) {
        try {
            return Optional.of(dtoConverter.toDomainObject(dto));
        } catch (Exception e) {
            LOGGER.error("Error deserializing DTO", e);
            return Optional.empty();
        }
    }

    String serialize(DeletedMessageWithStorageInformation message) {
        DeletedMessageWithStorageInformationDTO dto = DeletedMessageWithStorageInformationDTO.toDTO(message);

        try {
            return objectMapper.writeValueAsString(dto);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }
}