org.eth.cyril.util.serialization

Class JsonUtil

java.lang.Object

org.eth.cyril.util.serialization.JsonUtil

public class JsonUtil
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
JsonUtil()

Method Summary

Modifier and Type	Method and Description
static java.util.Optional<java.lang.Object>	getNewInstance(java.lang.Class<?> clazz) Returns a new instance of the given class, if it can be instantiated.
static boolean	hasKeys(javax.json.JsonValue value, java.lang.String... keys)
static boolean	hasZeroArgumentConstructor(java.lang.Class<?> clazz) Returns whether the given class has a constructor taking zero arguments (and therefore clazz.newInstance works).
static java.util.Optional<javax.json.JsonValue>	readFromFile(java.lang.String fileName) Read the Json content from the given file.
static java.util.Optional<java.lang.Object>	readObjectFromFile(java.lang.String fileName)
static java.util.Optional<java.lang.Class<?>>	tryGetClass(javax.json.JsonValue value, java.lang.String typeField) Tries to get the class stored in the JsonValue.
static void	writeToFile(java.lang.String fileName, javax.json.JsonValue json) Write the given Json content to the given file.
static void	writeToFile(java.lang.String fileName, java.lang.Object object) Write the given object to file, after trying to serialize it with the Serializers.jsonSerializableSerializer() serializer.

Methods inherited from class java.lang.Object

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

Constructor Detail

JsonUtil

public JsonUtil()

Method Detail

tryGetClass

public static java.util.Optional<java.lang.Class<?>> tryGetClass(javax.json.JsonValue value,
                                                                 java.lang.String typeField)

Tries to get the class stored in the JsonValue. For this, the JsonValue must be of the JsonObject type, have a string field with the name typeField, and that string field must contain the name of a class which can be found.

Parameters:

value - The JsonValue from which to extract the type.

typeField - The name of the type field in the JsonValue.

Returns:

A class, if it can be found, and an empty optional otherwise.

hasZeroArgumentConstructor

public static boolean hasZeroArgumentConstructor(java.lang.Class<?> clazz)

Returns whether the given class has a constructor taking zero arguments (and therefore clazz.newInstance works).

Parameters:

clazz - The class to check.

Returns:

Whether the given class has a zero argument constructor.

hasKeys

public static boolean hasKeys(javax.json.JsonValue value,
                              java.lang.String... keys)

getNewInstance

public static java.util.Optional<java.lang.Object> getNewInstance(java.lang.Class<?> clazz)

Returns a new instance of the given class, if it can be instantiated.

Parameters:

clazz - The class to instantiate an instance from.

Returns:

The instantiated instance, or null if an exception occurs.

writeToFile

public static void writeToFile(java.lang.String fileName,
                               java.lang.Object object)

Write the given object to file, after trying to serialize it with the Serializers.jsonSerializableSerializer() serializer.

Parameters:

fileName - The name of the file to store the Json in

object - The object to convert to json and to store in the file.

writeToFile

public static void writeToFile(java.lang.String fileName,
                               javax.json.JsonValue json)

Write the given Json content to the given file.

Parameters:

fileName - The name of the file to store the Json in.

json - The Json content to store in the file.

readFromFile

public static java.util.Optional<javax.json.JsonValue> readFromFile(java.lang.String fileName)

Read the Json content from the given file.

Parameters:

fileName - The name of the file to get the Json from.

Returns:

The Json content which was found, or an empty optional if no content was found.

readObjectFromFile

public static java.util.Optional<java.lang.Object> readObjectFromFile(java.lang.String fileName)