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package org.goudham.me;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.JavaType;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.type.TypeFactory;
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import org.goudham.me.api.entity.series.FilteredSeries;
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import org.goudham.me.api.entity.series.Series;
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import org.goudham.me.api.entity.waifu.Waifu;
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import org.goudham.me.exception.APIMapperException;
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import java.util.List;
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/**
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* Maps API Information to Java POJO's
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*
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*/
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class APIMapper {
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private final ObjectMapper objectMapper;
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APIMapper() {
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objectMapper = new ObjectMapper();
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}
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/**
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* Honestly I don't really know how this works
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*
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* @param entity The actual class of the given entity. E.g {@link Waifu#getClass()}
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* @param <T> The type of entity to be returned. E.g {@link Waifu} or {@link Series}
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* @return {@link JavaType}
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*
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*/
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private <T> JavaType listOf(Class<T> entity) {
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return TypeFactory.defaultInstance().constructCollectionType(List.class, entity);
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}
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/**
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* Using the given {@code entity}, {@link ObjectMapper} deserializes the given Json
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* into a Java POJO
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*
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* @param result The result of the previous API response
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* @param entity The actual class of the given entity. E.g {@link Waifu#getClass()}
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* @param <T> The type of entity to be returned. E.g {@link Waifu} or {@link Series}
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* @return {@link Response}
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* @throws APIMapperException If {@link ObjectMapper} is not able to deserialize JSON to Java POJO properly
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*
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*/
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<T> Response<T> deserialize(Result result, Class<T> entity) throws APIMapperException {
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Integer statusCode = result.getStatusCode();
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String body = result.getBody();
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T newEntity = null;
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if (statusCode == 200) {
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try {
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String data = getJsonTree(body);
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newEntity = objectMapper.readValue(data, entity);
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} catch (JsonProcessingException jpe) {
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throwAPIMapperException(jpe);
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}
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}
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return new Response<>(statusCode, body, newEntity);
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}
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/**
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* Using the given {@code entity}, {@link ObjectMapper} deserializes the given Json
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* into a Java POJO. This method enables support for retrieving {@link List} of entities
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*
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* @param result The result of the previous API response
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* @param entity The actual class of the given entity. E.g {@link Waifu#getClass()}
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* @param <T> List of entities to be returned. E.g {@link List} of {@link FilteredSeries}
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* @return {@link Response}
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* @throws APIMapperException If {@link ObjectMapper} is not able to deserialize JSON to Java POJO properly
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*/
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<T> Response<List<T>> deserializeToList(Result result, Class<T> entity) throws APIMapperException {
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Integer statusCode = result.getStatusCode();
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String body = result.getBody();
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List<T> listOfEntity = null;
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if (statusCode == 200) {
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try {
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String data = getJsonTree(body);
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listOfEntity = objectMapper.readValue(data, listOf(entity));
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} catch (JsonProcessingException jpe) {
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throwAPIMapperException(jpe);
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}
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}
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return new Response<>(statusCode, body, listOfEntity);
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}
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/**
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* Helper method for reducing duplicate code in {@code deserialize()}
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* and {@code deserializeToList()}
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* <br>
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* Returns the proper json data to deserialize
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*
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* @param jsonBody jsonBody returned by the API
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* @return {@link String}
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* @throws JsonProcessingException If {@link ObjectMapper} is not able to
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* read the given {@code jsonBody}
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*/
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private String getJsonTree(String jsonBody) throws JsonProcessingException {
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JsonNode parent = objectMapper.readTree(jsonBody);
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return parent.get("data").toString();
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}
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/**
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* Helper method for reducing duplicate code in {@code deserialize()}
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* and {@code deserializeToList()}
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*
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* @param throwable Type of throwable to throw
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* @throws APIMapperException Purpose of the method
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*/
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private void throwAPIMapperException(Throwable throwable) throws APIMapperException {
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String customExceptionMessage = "If you are seeing this message, " +
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"this is more than likely a fault in my logic. " +
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"Please raise an issue including the printed stacktrace :D";
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String exceptionMessage = "\n\n" + customExceptionMessage + "\n\n" + throwable.getMessage();
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throw new APIMapperException(exceptionMessage, throwable);
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}
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}
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