Package org.goplanit.utils.reflection

Class ReflectionUtils

java.lang.Object

org.goplanit.utils.reflection.ReflectionUtils

public class ReflectionUtils
extends Object

Reflection specific utility functions

Author:

markr

Constructor Summary

Constructors

Constructor	Description
ReflectionUtils()

Method Summary

Modifier and Type	Method	Description
static Object	createInstance(String className, Object... constructorParameters)	Create an instance of given class name and provided constructor parameters
static <T> T	createTypedInstance(String className, Object... constructorParameters)	delegates to createInstance(String, Object...) only casts result to type provided
static Map<String,Object>	declaredFieldsNameValueMap(Object settingsClazzInstance, Function<Integer,Boolean> modifierFilter)	Collect all declared fields of instance in Map in name, value format
static <K,V> Map<K,V>	declaredFieldsToMap(Object settingsClazzInstance, Function<Field,K> keyFunction, BiFunction<Field,Object,V> valueFunction, Function<Integer,Boolean> modifierFilter)	Collect all declared fields of instance in Map based on functions passed in
static Class<?>[]	getParameterTypes(Object[] parameters)	Method that constructs the parameter types that go with the passed in parameters.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtils

public ReflectionUtils()

Method Detail

getParameterTypes

public static Class<?>[] getParameterTypes(Object[] parameters)

Method that constructs the parameter types that go with the passed in parameters.

Parameters:

parameters - the parameters

Returns:

parameter class types

createTypedInstance

public static <T> T createTypedInstance(String className,
                                        Object... constructorParameters)
                                 throws PlanItException

delegates to createInstance(String, Object...) only casts result to type provided

Type Parameters:

T - type of the created instance

Parameters:

className - of the class to be instantiated

constructorParameters - parameters for constructor

Returns:

created instance

Throws:

PlanItException - when error occurs during instantiation

createInstance

public static Object createInstance(String className,
                                    Object... constructorParameters)

Create an instance of given class name and provided constructor parameters

Parameters:

className - of the class to be instantiated

constructorParameters - parameters for constructor

Returns:

created instance

declaredFieldsNameValueMap

public static Map<String,Object> declaredFieldsNameValueMap(Object settingsClazzInstance,
                                                                  Function<Integer,Boolean> modifierFilter)

Collect all declared fields of instance in Map in name, value format

Parameters:

settingsClazzInstance - to collect from

modifierFilter - applied to the fields of the class, when false we exclude the field, when true we keep it

Returns:

map with entries, or empty if none could be found or something went wrong

declaredFieldsToMap

public static <K,V> Map<K,V> declaredFieldsToMap(Object settingsClazzInstance,
                                                             Function<Field,K> keyFunction,
                                                             BiFunction<Field,Object,V> valueFunction,
                                                             Function<Integer,Boolean> modifierFilter)

Collect all declared fields of instance in Map based on functions passed in

Type Parameters:

K - key in result map

V - value in result map

Parameters:

settingsClazzInstance - to collect from

keyFunction - transforms field to key entry in map

valueFunction - transforms field to value entry in map

modifierFilter - applied to the fields of the class, when false we exclude the field, when true we keep it

Returns:

map with entries, or empty if none could be found or something went wrong