Package org.fluentlenium.utils

Class ReflectionUtils

java.lang.Object

org.fluentlenium.utils.ReflectionUtils

public final class ReflectionUtils
extends Object

Utility class for reflection.

Method Summary

Modifier and Type	Method	Description
static Object	get(Field field, Object obj)	Get the field value even if not accessible.
static <T> Constructor<T>	getConstructor(Class<T> cls, Class<?>... argsTypes)	Retrieve the constructor of a class for given argument types.
static <T> Constructor<T>	getConstructorOptional(int mandatoryCount, Class<T> cls, Class<?>... argsTypes)	Retrieve the constructor of a class for given optional argument types, considering mandatory values at the beginning of the given types.
static <T> T	getDefault(Class<T> type)	Get default value for given type.
static Class<?>	getFirstGenericType(Field field)	Retrieve the first generic type of the field type.
static Method	getMethod(Class<?> declaringClass, String name, Class... types)	Get public method by name from the declaring class.
static Object	invoke(Method method, Object obj, Object... args)	Invoke the method event if not accessible.
static <T> T	newInstance(Class<T> cls, Object... args)	Creates a new instance matching possible constructors with provided args.
static <T> T	newInstanceOptionalArgs(int mandatoryCount, Class<T> cls, Object... args)	Creates a new instance by trying every possible constructors with provided args.
static <T> T	newInstanceOptionalArgs(Class<T> cls, Object... args)	Creates a new instance by trying every possible constructors with provided args.
static void	set(Field field, Object obj, Object value)	Set the field even if not accessible.
static Object[]	toArgs(Function<Class<?>,Object> valueSupplier, Class<?>... array)	Converts an array of values provided by an array of Class and Function supplying value for each class into an array of Object
static Class<?>[]	toClass(Object... array)	Converts an array of Object into an array of Class objects.
static <T> Class<T>	wrapPrimitive(Class<T> clazz)	Wrap given class to it's primitive class if it's matching a primitive class.

Methods inherited from class java.lang.Object

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

Method Detail

wrapPrimitive

public static <T> Class<T> wrapPrimitive(Class<T> clazz)

Wrap given class to it's primitive class if it's matching a primitive class.

Type Parameters:

T - type of class

Parameters:

clazz - primitive class or not

Returns:

class or primitive class

toClass

public static Class<?>[] toClass(Object... array)

Converts an array of Object into an array of Class objects.

If any of these objects is null, a null element will be inserted into the array.

This method returns null for a null input array.

Parameters:

array - an Object array

Returns:

a Class array, null if null array input

toArgs

public static Object[] toArgs(Function<Class<?>,Object> valueSupplier,
                              Class<?>... array)

Converts an array of values provided by an array of Class and Function supplying value for each class into an array of Object

Parameters:

valueSupplier - supplier of values for each class

array - array of class

Returns:

array of values

getDefault

public static <T> T getDefault(Class<T> type)

Get default value for given type.

Type Parameters:

T - type of value

Parameters:

type - type of value to get the default

Returns:

default value

getConstructor

public static <T> Constructor<T> getConstructor(Class<T> cls,
                                                Class<?>... argsTypes)
                                         throws NoSuchMethodException

Retrieve the constructor of a class for given argument types.

Type Parameters:

T - type to retrieve the constructor from

Parameters:

cls - class to retrieve the constructor from

argsTypes - argument types

Returns:

matching constructor for given argument values

Throws:

NoSuchMethodException - if a matching method is not found.

getConstructorOptional

public static <T> Constructor<T> getConstructorOptional(int mandatoryCount,
                                                        Class<T> cls,
                                                        Class<?>... argsTypes)
                                                 throws NoSuchMethodException

Retrieve the constructor of a class for given optional argument types, considering mandatory values at the beginning of the given types.

Type Parameters:

T - type to retrieve the constructor from

Parameters:

mandatoryCount - number of mandatory arguments at the beginning of the given arguments

cls - class to retrieve the constructor from

argsTypes - argument types

Returns:

matching constructor for given optional argument values

Throws:

NoSuchMethodException - if a matching method is not found.

newInstance

public static <T> T newInstance(Class<T> cls,
                                Object... args)
                         throws NoSuchMethodException,
                                IllegalAccessException,
                                InvocationTargetException,
                                InstantiationException

Creates a new instance matching possible constructors with provided args.

Type Parameters:

T - type of the instance

Parameters:

cls - class to instantiate

args - arguments of the constructor

Returns:

new instance

Throws:

NoSuchMethodException - if a matching method is not found.

IllegalAccessException - if this Constructor object is enforcing Java language access control and the underlying constructor is inaccessible.

InstantiationException - if the class that declares the underlying constructor represents an abstract class.

InvocationTargetException - if the underlying constructor throws an exception.

newInstanceOptionalArgs

public static <T> T newInstanceOptionalArgs(Class<T> cls,
                                            Object... args)
                                     throws NoSuchMethodException,
                                            IllegalAccessException,
                                            InvocationTargetException,
                                            InstantiationException

Creates a new instance by trying every possible constructors with provided args.

Type Parameters:

T - type of the instance

Parameters:

cls - class to instantiate

args - arguments of the constructor

Returns:

new instance

Throws:

NoSuchMethodException - if a matching method is not found.

IllegalAccessException - if this Constructor object is enforcing Java language access control and the underlying constructor is inaccessible.

InstantiationException - if the class that declares the underlying constructor represents an abstract class.

InvocationTargetException - if the underlying constructor throws an exception.

newInstanceOptionalArgs

public static <T> T newInstanceOptionalArgs(int mandatoryCount,
                                            Class<T> cls,
                                            Object... args)
                                     throws NoSuchMethodException,
                                            IllegalAccessException,
                                            InvocationTargetException,
                                            InstantiationException

Creates a new instance by trying every possible constructors with provided args.

Type Parameters:

T - type of the instance

Parameters:

mandatoryCount - count of mandatory arguments

cls - class to instantiate

args - arguments of the constructor

Returns:

new instance

Throws:

NoSuchMethodException - if a matching method is not found.

IllegalAccessException - if this Constructor object is enforcing Java language access control and the underlying constructor is inaccessible.

InstantiationException - if the class that declares the underlying constructor represents an abstract class.

InvocationTargetException - if the underlying constructor throws an exception.

invoke

public static Object invoke(Method method,
                            Object obj,
                            Object... args)
                     throws InvocationTargetException,
                            IllegalAccessException

Invoke the method event if not accessible.

Parameters:

method - method to invoke

obj - object to invoke

args - arguments of the method

Returns:

return value from the method invocation

Throws:

IllegalAccessException - if this Method object is enforcing Java language access control and the underlying method is inaccessible.

InvocationTargetException - if the underlying method throws an exception.

See Also:

Method.invoke(Object, Object...)

get

public static Object get(Field field,
                         Object obj)
                  throws IllegalAccessException

Get the field value even if not accessible.

Parameters:

field - field to get

obj - instance to get

Returns:

field value

Throws:

IllegalAccessException - if this Field object is enforcing Java language access control and the underlying field is inaccessible.

See Also:

Field.get(Object)

set

public static void set(Field field,
                       Object obj,
                       Object value)
                throws IllegalAccessException

Set the field even if not accessible.

Parameters:

field - field to set

obj - instance to set

value - value of the field to set

Throws:

IllegalAccessException - if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.

See Also:

Field.set(Object, Object)

getFirstGenericType

public static Class<?> getFirstGenericType(Field field)

Retrieve the first generic type of the field type.

Parameters:

field - field to analyze

Returns:

first generic type, or null if no generic type is found

getMethod

public static Method getMethod(Class<?> declaringClass,
                               String name,
                               Class... types)

Get public method by name from the declaring class.

Parameters:

declaringClass - declaring class

name - method name

types - argument types

Returns:

the public method by the specified name

Throws:

IllegalArgumentException - when there is no method found with the specified name