org.finra.herd.dao.helper

Class JsonHelper

java.lang.Object

org.finra.herd.dao.helper.JsonHelper

@Component
public class JsonHelper
extends Object

A helper class for JSON functionality.

Constructor Summary

Constructors

Constructor and Description
JsonHelper()

Method Summary

Modifier and Type	Method and Description
<T> T	getKeyValue(JSONObject jsonObject, Object key, Class<T> classType) Gets key value from the specified JSON object.
String	objectToJson(Object object) Serializes any Java value as JSON output.
<T> List<T>	unmarshallJsonToListOfObjects(Class<T> classType, String jsonContent) Deserializes JSON content from given JSON content String to a list of objects.
<T> T	unmarshallJsonToObject(Class<T> classType, String jsonContent) Deserializes JSON content from given JSON content String.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsonHelper

public JsonHelper()

Method Detail

getKeyValue

public <T> T getKeyValue(JSONObject jsonObject,
                         Object key,
                         Class<T> classType)

Gets key value from the specified JSON object. The method throws an exception, when specified key does not exist.

Type Parameters:

T - the return type

Parameters:

jsonObject - the JSON object that contains the key value

key - the key name

classType - the class to cast the result to

Returns:

the key value

objectToJson

public String objectToJson(Object object)
                    throws IllegalStateException

Serializes any Java value as JSON output.

Parameters:

object - the Java object to be serialized

Returns:

the JSON representation of the object

Throws:

IllegalStateException - when an I/O error occurs

unmarshallJsonToListOfObjects

public <T> List<T> unmarshallJsonToListOfObjects(Class<T> classType,
                                                 String jsonContent)
                                          throws IOException

Deserializes JSON content from given JSON content String to a list of objects.

Parameters:

classType - the class type of the object

jsonContent - the JSON string

Returns:

the object

Throws:

IOException - if there is an error in unmarshalling

unmarshallJsonToObject

public <T> T unmarshallJsonToObject(Class<T> classType,
                                    String jsonContent)
                             throws IOException

Deserializes JSON content from given JSON content String.

Parameters:

classType - the class type of the object

jsonContent - the JSON string

Returns:

the object

Throws:

IOException - if there is an error in unmarshalling