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com.mercadopago.serialization.Serializer Maven / Gradle / Ivy
package com.mercadopago.serialization;
import static com.google.gson.stream.JsonToken.END_DOCUMENT;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializer;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.MalformedJsonException;
import com.mercadopago.exceptions.MPJsonParseException;
import com.mercadopago.net.MPElementsResourcesPage;
import com.mercadopago.net.MPResource;
import com.mercadopago.net.MPResourceList;
import com.mercadopago.net.MPResultsResourcesPage;
import java.io.IOException;
import java.io.StringReader;
import java.lang.reflect.Type;
import java.time.LocalDate;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.ArrayList;
import java.util.List;
/** Serializer class, responsible for objects serialization and deserialization. */
public class Serializer {
private static final DateTimeFormatter DESERIALIZE_DATE_FORMAT_ISO8601_EXTENDED =
DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss[.SSS][XXX][XX][X]");
private static final DateTimeFormatter DESERIALIZE_DATE_FORMAT_ISO8601_BASIC =
DateTimeFormatter.ofPattern("yyyyMMdd'T'HHmmss[.SSS][XXX][XX][X]");
private static final DateTimeFormatter[] ISO8601_DATETIME_FORMATTERS =
new DateTimeFormatter[] {
DateTimeFormatter.ISO_DATE_TIME,
DESERIALIZE_DATE_FORMAT_ISO8601_EXTENDED,
DESERIALIZE_DATE_FORMAT_ISO8601_BASIC,
};
private static final String SERIALIZE_DATE_FORMAT_ISO8601 = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX";
private static OffsetDateTime parseDateTime(JsonElement json) {
if (json == null || json.getAsString().isEmpty()) {
return null;
}
for (int i = 0; i < ISO8601_DATETIME_FORMATTERS.length; i++) {
try {
return OffsetDateTime.parse(json.getAsString(), ISO8601_DATETIME_FORMATTERS[i]);
} catch (DateTimeParseException e) {
// try all formatters, if none works, throw exception from last one
if (i == ISO8601_DATETIME_FORMATTERS.length - 1) {
throw e;
}
}
}
return null;
}
private static final Gson GSON =
new GsonBuilder()
.registerTypeAdapter(
OffsetDateTime.class,
(JsonDeserializer) (json, type, context) -> parseDateTime(json))
.registerTypeAdapter(
OffsetDateTime.class,
(JsonSerializer)
(offsetDateTime, type, context) ->
new JsonPrimitive(
DateTimeFormatter.ofPattern(SERIALIZE_DATE_FORMAT_ISO8601)
.format(offsetDateTime)))
.registerTypeAdapter(
LocalDate.class,
(JsonSerializer)
(localDate, type, context) ->
new JsonPrimitive(localDate.format(DateTimeFormatter.ISO_LOCAL_DATE)))
.registerTypeAdapter(
LocalDate.class,
(JsonDeserializer)
(localDate, type, context) -> LocalDate.parse(localDate.getAsString()))
.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create();
/**
* Method responsible for deserialize objects.
*
* @param clazz class.
* @param jsonObject json object.
* @param class type.
* @return object.
* @throws MPJsonParseException if json cannot be deserialized to an MPResource
*/
public static T deserializeFromJson(Class clazz, String jsonObject)
throws MPJsonParseException {
try {
if (isJsonValid(jsonObject)) {
return GSON.fromJson(jsonObject, clazz);
} else {
throw new MPJsonParseException(String.format("Could not parse json: %s", jsonObject));
}
} catch (IOException e) {
throw new MPJsonParseException("Could not parse json", e);
}
}
/**
* Method responsible for deserialize json to ResultsResources.
*
* @param type type
* @param jsonObject jsonObject
* @param generic type
* @return MPResultsResourcesPage deserialized MPResource
* @throws MPJsonParseException if json cannot be parsed to ResultsResourcesPage
*/
public static
MPResultsResourcesPage deserializeResultsResourcesPageFromJson(
Type type, String jsonObject) throws MPJsonParseException {
try {
if (isJsonValid(jsonObject)) {
return GSON.fromJson(jsonObject, type);
} else {
throw new MPJsonParseException(String.format("Could not parse json: %s", jsonObject));
}
} catch (IOException e) {
throw new MPJsonParseException("Could not parse json", e);
}
}
/**
* Method responsible for deserialize json to ElementsResources.
*
* @param type type
* @param jsonObject jsonObject
* @param generic type
* @return MPElementsResourcesPage
* @throws MPJsonParseException if json cannot be parsed to MPElementsResourcesPage
*/
public static
MPElementsResourcesPage deserializeElementsResourcesPageFromJson(
Type type, String jsonObject) throws MPJsonParseException {
try {
if (isJsonValid(jsonObject)) {
return GSON.fromJson(jsonObject, type);
} else {
throw new MPJsonParseException(String.format("Could not parse json: %s", jsonObject));
}
} catch (IOException | MPJsonParseException e) {
throw new MPJsonParseException("Could not parse json", e);
}
}
/**
* Method responsible for deserialize objects.
*
* @param clazz clazz
* @param jsonObject jsonObject
* @param type
* @return MPResourceList
* @throws MPJsonParseException if json cannot be parsed to ResultsResourcesPage
*/
public static MPResourceList deserializeListFromJson(
Class clazz, String jsonObject) throws MPJsonParseException {
try {
if (isJsonValid(jsonObject)) {
MPResourceList resourceList = new MPResourceList<>();
List results = new ArrayList<>();
JsonArray jsonArray = JsonParser.parseString(jsonObject).getAsJsonArray();
for (int i = 0; i < jsonArray.size(); i++) {
T resource = GSON.fromJson(jsonArray.get(i), clazz);
results.add(resource);
}
resourceList.setResults(results);
return resourceList;
} else {
throw new MPJsonParseException(String.format("Could not parse json: %s", jsonObject));
}
} catch (IOException e) {
throw new MPJsonParseException("Could not parse json", e);
}
}
/**
* Method responsible for serialize objects.
*
* @param resource resource.
* @param class type.
* @return JsonObject.
*/
public static JsonObject serializeToJson(T resource) {
return (JsonObject) GSON.toJsonTree(resource);
}
/**
* Verify if json is valid.
*
* @param json json
* @return boolean
* @throws IOException exception
*/
public static boolean isJsonValid(String json) throws IOException {
try {
JsonReader jsonReader = new JsonReader(new StringReader(json));
JsonToken token;
loop:
while ((token = jsonReader.peek()) != END_DOCUMENT && token != null) {
switch (token) {
case BEGIN_ARRAY:
jsonReader.beginArray();
break;
case END_ARRAY:
jsonReader.endArray();
break;
case BEGIN_OBJECT:
jsonReader.beginObject();
break;
case END_OBJECT:
jsonReader.endObject();
break;
case NAME:
jsonReader.nextName();
break;
case STRING:
case NUMBER:
case BOOLEAN:
case NULL:
jsonReader.skipValue();
break;
case END_DOCUMENT:
break loop;
default:
throw new AssertionError(token);
}
}
return true;
} catch (final MalformedJsonException ignored) {
return false;
}
}
}
