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GitLab4J-API (gitlab4j-api) provides a full featured Java client library for working with GitLab repositories and servers via the GitLab REST API.
package org.gitlab4j.api.utils;
import java.io.IOException;
import java.io.Reader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.ext.ContextResolver;
import org.gitlab4j.api.models.User;
import org.glassfish.jersey.jackson.internal.jackson.jaxrs.json.JacksonJaxbJsonProvider;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.type.CollectionType;
/**
* Jackson JSON Configuration and utility class.
*/
@Produces(MediaType.APPLICATION_JSON)
public class JacksonJson extends JacksonJaxbJsonProvider implements ContextResolver {
private static final SimpleDateFormat iso8601UtcFormat;
static {
iso8601UtcFormat = new SimpleDateFormat(ISO8601.UTC_PATTERN);
iso8601UtcFormat.setLenient(true);
iso8601UtcFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
}
private final ObjectMapper objectMapper;
public JacksonJson() {
objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(Include.NON_NULL);
objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
objectMapper.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);
SimpleModule module = new SimpleModule("GitLabApiJsonModule");
module.addSerializer(Date.class, new JsonDateSerializer());
module.addDeserializer(Date.class, new JsonDateDeserializer());
objectMapper.registerModule(module);
setMapper(objectMapper);
}
@Override
public ObjectMapper getContext(Class objectType) {
return (objectMapper);
}
/**
* Gets the ObjectMapper contained by this instance.
*
* @return the ObjectMapper contained by this instance
*/
public ObjectMapper getObjectMapper() {
return (objectMapper);
}
/**
* Reads and parses the String containing JSON data and returns a JsonNode tree representation.
*
* @param postData a String holding the POST data
* @return a JsonNode instance containing the parsed JSON
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public JsonNode readTree(String postData) throws JsonParseException, JsonMappingException, IOException {
return (objectMapper.readTree(postData));
}
/**
* Reads and parses the JSON data on the specified Reader instance to a JsonNode tree representation.
*
* @param reader the Reader instance that contains the JSON data
* @return a JsonNode instance containing the parsed JSON
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public JsonNode readTree(Reader reader) throws JsonParseException, JsonMappingException, IOException {
return (objectMapper.readTree(reader));
}
/**
* Unmarshal the JsonNode (tree) to an instance of the provided class.
*
* @param the generics type for the return value
* @param returnType an instance of this type class will be returned
* @param tree the JsonNode instance that contains the JSON data
* @return an instance of the provided class containing the data from the tree
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public T unmarshal(Class returnType, JsonNode tree) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(returnType);
return (objectMapper.treeToValue(tree, returnType));
}
/**
* Unmarshal the JSON data on the specified Reader instance to an instance of the provided class.
*
* @param the generics type for the return value
* @param returnType an instance of this type class will be returned
* @param reader the Reader instance that contains the JSON data
* @return an instance of the provided class containing the parsed data from the Reader
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public T unmarshal(Class returnType, Reader reader) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(returnType);
return (objectMapper.readValue(reader, returnType));
}
/**
* Unmarshal the JSON data contained by the string and populate an instance of the provided returnType class.
*
* @param the generics type for the return value
* @param returnType an instance of this type class will be returned
* @param postData a String holding the POST data
* @return an instance of the provided class containing the parsed data from the string
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public T unmarshal(Class returnType, String postData) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(returnType);
return (objectMapper.readValue(postData, returnType));
}
/**
* Unmarshal the JSON data on the specified Reader instance and populate a List of instances of the provided returnType class.
*
* @param the generics type for the List
* @param returnType an instance of this type class will be contained in the returned List
* @param reader the Reader instance that contains the JSON data
* @return a List of the provided class containing the parsed data from the Reader
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public List unmarshalList(Class returnType, Reader reader) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(null);
CollectionType javaType = objectMapper.getTypeFactory().constructCollectionType(List.class, returnType);
return (objectMapper.readValue(reader, javaType));
}
/**
* Unmarshal the JSON data contained by the string and populate a List of instances of the provided returnType class.
*
* @param the generics type for the List
* @param returnType an instance of this type class will be contained in the returned List
* @param postData a String holding the POST data
* @return a List of the provided class containing the parsed data from the string
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public List unmarshalList(Class returnType, String postData) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(null);
CollectionType javaType = objectMapper.getTypeFactory().constructCollectionType(List.class, returnType);
return (objectMapper.readValue(postData, javaType));
}
/**
* Unmarshal the JSON data on the specified Reader instance and populate a Map of String keys and values of the provided returnType class.
*
* @param the generics type for the Map value
* @param returnType an instance of this type class will be contained the values of the Map
* @param reader the Reader instance that contains the JSON data
* @return a Map containing the parsed data from the Reader
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public Map unmarshalMap(Class returnType, Reader reader) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(null);
return (objectMapper.readValue(reader, new TypeReference>() {}));
}
/**
* Unmarshal the JSON data and populate a Map of String keys and values of the provided returnType class.
*
* @param the generics type for the Map value
* @param returnType an instance of this type class will be contained the values of the Map
* @param jsonData the String containing the JSON data
* @return a Map containing the parsed data from the String
* @throws JsonParseException when an error occurs parsing the provided JSON
* @throws JsonMappingException if a JSON error occurs
* @throws IOException if an error occurs reading the JSON data
*/
public Map unmarshalMap(Class returnType, String jsonData) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = getContext(null);
return (objectMapper.readValue(jsonData, new TypeReference>() {}));
}
/**
* Marshals the supplied object out as a formatted JSON string.
*
* @param the generics type for the provided object
* @param object the object to output as a JSON string
* @return a String containing the JSON for the specified object
*/
public String marshal(final T object) {
if (object == null) {
throw new IllegalArgumentException("object parameter is null");
}
ObjectWriter writer = objectMapper.writer().withDefaultPrettyPrinter();
String results = null;
try {
results = writer.writeValueAsString(object);
} catch (JsonGenerationException e) {
System.err.println("JsonGenerationException, message=" + e.getMessage());
} catch (JsonMappingException e) {
e.printStackTrace();
System.err.println("JsonMappingException, message=" + e.getMessage());
} catch (IOException e) {
System.err.println("IOException, message=" + e.getMessage());
}
return (results);
}
/**
* JsonSerializer for serializing dates s yyyy-mm-dd in UTC timezone.
*/
public static class DateOnlySerializer extends JsonSerializer {
@Override
public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException, JsonProcessingException {
String dateString = ISO8601.dateOnly(date);
gen.writeString(dateString);
}
}
/**
* JsonSerializer for serializing ISO8601 formatted dates.
*/
public static class JsonDateSerializer extends JsonSerializer {
@Override
public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException, JsonProcessingException {
String iso8601String = ISO8601.toString(date);
gen.writeString(iso8601String);
}
}
/**
* JsonDeserializer for deserializing ISO8601 formatted dates.
*/
public static class JsonDateDeserializer extends JsonDeserializer {
@Override
public Date deserialize(JsonParser jsonparser, DeserializationContext context) throws IOException, JsonProcessingException {
try {
return (ISO8601.toDate(jsonparser.getText()));
} catch (ParseException e) {
throw new RuntimeException(e);
}
}
}
/**
* Serializer for the odd User instances in the "approved_by" array in the merge_request JSON.
*/
public static class UserListSerializer extends JsonSerializer> {
@Override
public void serialize(List value, JsonGenerator jgen,
SerializerProvider provider) throws IOException,
JsonProcessingException {
jgen.writeStartArray();
for (User user : value) {
jgen.writeStartObject();
jgen.writeObjectField("user", user);
jgen.writeEndObject();
}
jgen.writeEndArray();
}
}
/**
* Deserializer for the odd User instances in the "approved_by" array in the merge_request JSON.
*/
public static class UserListDeserializer extends JsonDeserializer> {
private static final ObjectMapper mapper = new JacksonJson().getObjectMapper();
@Override
public List deserialize(JsonParser jsonParser, DeserializationContext context)
throws IOException, JsonProcessingException {
JsonNode tree = jsonParser.readValueAsTree();
int numUsers = tree.size();
List users = new ArrayList<>(numUsers);
for (int i = 0; i < numUsers; i++) {
JsonNode node = tree.get(i);
JsonNode userNode = node.get("user");
User user = mapper.treeToValue(userNode, User.class);
users.add(user);
}
return (users);
}
}
/**
* This class is used to create a thread-safe singleton instance of JacksonJson customized
* to be used by
*/
private static class JacksonJsonSingletonHelper {
private static final JacksonJson JACKSON_JSON = new JacksonJson();
static {
JACKSON_JSON.objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.LOWER_CAMEL_CASE);
JACKSON_JSON.objectMapper.setSerializationInclusion(Include.ALWAYS);
}
}
/**
* Gets a the supplied object output as a formatted JSON string. Null properties will
* result in the value of the property being null. This is meant to be used for
* toString() implementations of GitLab4J classes.
*
* @param the generics type for the provided object
* @param object the object to output as a JSON string
* @return a String containing the JSON for the specified object
*/
public static String toJsonString(final T object) {
return (JacksonJsonSingletonHelper.JACKSON_JSON.marshal(object));
}
/**
* Parse the provided String into a JsonNode instance.
*
* @param jsonString a String containing JSON to parse
* @return a JsonNode with the String parsed into a JSON tree
* @throws IOException if any IO error occurs
*/
public static JsonNode toJsonNode(String jsonString) throws IOException {
return (JacksonJsonSingletonHelper.JACKSON_JSON.objectMapper.readTree(jsonString));
}
}
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