Package io.github.joselion.springr2dbcrelationships.helpers

Class Reflect

java.lang.Object

io.github.joselion.springr2dbcrelationships.helpers.Reflect

public final class Reflect
extends Object

Reflection helpers.

Method Summary

Modifier and Type	Method	Description
static <T> @Nullable T	getter(Object target, Field field)	Finds and invokes the getter of a field in the provided target.
static <T> @Nullable T	getter(Object target, Method method)	Finds and invokes the getter of a field in the provided target.
static <T> @Nullable T	getter(Object target, String fieldName)	Finds and invokes the getter of a field in the provided target.
static <T> Function<Object,@Nullable T>	getter(Field field)	Curried version of getter(Object, Field) overload.
static <T> Function<Object,@Nullable T>	getter(String fieldName)	Curried version of getter(Object, String) overload.
static <T> Class<T>	innerTypeOf(Field field)	Returns the first inner type of a field's type.
static <T> Function<T,@Nullable T>	update(Field field, @Nullable Object value)	Curried version of update(Object, Field, Object) overload.
static <T> Function<T,@Nullable T>	update(String fieldName, @Nullable Object value)	Curried version of update(Object, String, Object) overload.
static <T> @Nullable T	update(T target, Field field, @Nullable Object value)	Updates a field using either a wither or a setter method.
static <T> @Nullable T	update(T target, String fieldName, @Nullable Object value)	Updates a field using either a wither or a setter method.

Methods inherited from class java.lang.Object

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

Method Details

getter

public static <T> @Nullable T getter(Object target,
 Field field)

Finds and invokes the getter of a field in the provided target.

Type Parameters:

T - the return type of the getter

Parameters:

target - the target instance were the getter is invoked

field - the field to invoke the getter

Returns:

the result of invoking the getter

Throws:

ReflectException - if the getter method cannot be found or fails to be invoked

getter

public static <T> Function<Object,@Nullable T> getter(Field field)

Curried version of getter(Object, Field) overload.

Type Parameters:

T - the return type of the getter

Parameters:

field - the field to invoke the getter

Returns:

a function that takes the target as parameter and returns the result of invoking the getter of the field

getter

public static <T> @Nullable T getter(Object target,
 String fieldName)

Finds and invokes the getter of a field in the provided target.

Type Parameters:

T - the return type of the getter

Parameters:

target - the target instance were the getter is invoked

fieldName - the name of the field to invoke the getter

Returns:

the result of invoking the getter

Throws:

ReflectException - if the getter method cannot be found or fails to be invoked

getter

public static <T> Function<Object,@Nullable T> getter(String fieldName)

Curried version of getter(Object, String) overload.

Type Parameters:

T - the return type of the getter

Parameters:

fieldName - the name of the field to invoke the getter

Returns:

a function that takes the target as parameter and returns the result of invoking the getter of the field

getter

public static <T> @Nullable T getter(Object target,
 Method method)

Finds and invokes the getter of a field in the provided target.

Type Parameters:

T - the return type of the getter

Parameters:

target - the target instance were the getter is invoked

method - the method of the getter to invoke

Returns:

the result of invoking the getter

Throws:

ReflectException - if the getter method cannot be found or fails to be invoked

update

public static <T> @Nullable T update(T target,
 Field field,
 @Nullable Object value)

Updates a field using either a wither or a setter method. Then returns the target with the updated field.

Type Parameters:

T - the target type

Parameters:

target - the target instance where the field is updated

field - the field to update

value - the value to update the field to

Returns:

the updated target

Throws:

ReflectException - if the wither/setter method cannot be found or fails to be invoked

update

public static <T> Function<T,@Nullable T> update(Field field,
 @Nullable Object value)

Curried version of update(Object, Field, Object) overload.

Type Parameters:

T - the target type

Parameters:

field - the field to update

value - the value to update the field to

Returns:

a function that takes the target as argument and returns the updated target

update

public static <T> @Nullable T update(T target,
 String fieldName,
 @Nullable Object value)

Updates a field using either a wither or a setter method. Then returns the target with the updated field.

Type Parameters:

T - the target type

Parameters:

target - the target instance where the field is updated

fieldName - the field name to update

value - the value to update the field to

Returns:

the updated target

Throws:

ReflectException - if the wither/setter method cannot be found or fails to be invoked

update

public static <T> Function<T,@Nullable T> update(String fieldName,
 @Nullable Object value)

Curried version of update(Object, String, Object) overload.

Type Parameters:

T - the target type

Parameters:

fieldName - the field name to update

value - the value to update the field to

Returns:

a function that takes the target as argument and returns the updated target

innerTypeOf

public static <T> Class<T> innerTypeOf(Field field)

Returns the first inner type of a field's type.

Type Parameters:

T - the type of the generic

Parameters:

field - the field to find the inner type

Returns:

the inner type of a field's type

Throws:

ReflectException - if the field's type does not have an inner generic type