io.mosip.credentialstore.util.JsonUtil Maven / Gradle / Ivy
package io.mosip.credentialstore.util;
import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.mosip.credentialstore.exception.FieldNotFoundException;
import io.mosip.credentialstore.exception.InstantanceCreationException;
/**
* This class provides JSON utilites.
*
* @author Pranav Kumar
* @since 0.0.1
*/
public class JsonUtil {
/** The Constant LANGUAGE. */
private static final String LANGUAGE = "language";
/** The Constant VALUE. */
private static final String VALUE = "value";
/**
* Instantiates a new json util.
*/
private JsonUtil() {
}
/**
* This method returns the Json Object as value from identity.json
* object(JSONObject). jsonObject -> then identity demographic json object key
* -> demographic json label name EX:- demographicIdentity : { "identity" : {
* "fullName" : [ { "language" : "eng", "value" : "Taleev Aalam" }, {
* "language": "ara", "value" : "Taleev Aalam" } ] }
*
* method call :- getJSONObject(demographicIdentity,identity)
*
* @param jsonObject
* the json object
* @param key
* the key
* @return the JSON object
*/
public static JSONObject getJSONObject(JSONObject jsonObject, Object key) {
if(jsonObject == null)
return null;
LinkedHashMap identity = (LinkedHashMap) jsonObject.get(key);
return identity != null ? new JSONObject(identity) : null;
}
/**
* This method returns JSONArray from JSONObject. argument 'jsonObject' ->
* demographic identity json as JSONObject. argument key -> label name of
* demographic identity json. Ex:- "identity" : { "fullName" : [ { "language" :
* "eng", "value" : "Taleev Aalam" }, { "language" : "ara", "value" : "Taleev
* Aalam" } ] }
*
* @param jsonObject
* the json object
* @param key
* the key
* @return the JSON array
*/
public static JSONArray getJSONArray(JSONObject jsonObject, Object key) {
ArrayList value = (ArrayList) jsonObject.get(key);
if (value == null)
return null;
JSONArray jsonArray = new JSONArray();
jsonArray.addAll(value);
return jsonArray;
}
/**
* Gets the JSON value.
*
* @param
* the generic type
* @param jsonObject
* the json object
* @param key
* the key
* @return the JSON value
*/
public static T getJSONValue(JSONObject jsonObject, String key) {
if(jsonObject == null)
return null;
T value = (T) jsonObject.get(key);
return value;
}
/**
* Iterates the JSONArray and returns JSONObject for given index.
*
* @param jsonObject
* the json object
* @param key
* the key
* @return the JSON object
*/
public static JSONObject getJSONObjectFromArray(JSONArray jsonObject, int key) {
Object object = jsonObject.get(key);
if(object instanceof LinkedHashMap) {
LinkedHashMap identity = (LinkedHashMap) jsonObject.get(key);
return identity != null ? new JSONObject(identity) : null;
}else {
return (JSONObject)object;
}
}
/**
* Object mapper read value. This method maps the jsonString to particular type
*
* @param
* the generic type
* @param jsonString
* the json string
* @param clazz
* the clazz
* @return the t
* @throws JsonParseException
* the json parse exception
* @throws JsonMappingException
* the json mapping exception
* @throws IOException
* Signals that an I/O exception has occurred.
*/
@SuppressWarnings("unchecked")
public static T objectMapperReadValue(String jsonString, Class clazz) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
return (T) objectMapper.readValue(jsonString, clazz);
}
/**
* Map json node to java object.
*
* @param
* the generic type
* @param genericType
* the generic type
* @param demographicJsonNode
* the demographic json node
* @return the t[]
*/
@SuppressWarnings("unchecked")
public static T[] mapJsonNodeToJavaObject(Class genericType, JSONArray demographicJsonNode) {
String language;
String value;
T[] javaObject = (T[]) Array.newInstance(genericType, demographicJsonNode.size());
try {
for (int i = 0; i < demographicJsonNode.size(); i++) {
T jsonNodeElement = (T) genericType.newInstance();
JSONObject objects = JsonUtil.getJSONObjectFromArray(demographicJsonNode, i);
if (objects != null) {
language = (String) objects.get(LANGUAGE);
value = (String) objects.get(VALUE);
Field languageField = jsonNodeElement.getClass().getDeclaredField(LANGUAGE);
languageField.setAccessible(true);
languageField.set(jsonNodeElement, language);
Field valueField = jsonNodeElement.getClass().getDeclaredField(VALUE);
valueField.setAccessible(true);
valueField.set(jsonNodeElement, value);
javaObject[i] = jsonNodeElement;
}
}
} catch (InstantiationException | IllegalAccessException e) {
throw new InstantanceCreationException(
e);
} catch (NoSuchFieldException | SecurityException e) {
throw new FieldNotFoundException(e);
}
return javaObject;
}
public static String objectMapperObjectToJson(Object obj) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
return objectMapper.writeValueAsString(obj);
}
}