Package org.jdbi.v3.core.internal

Class JdbiClassUtils

java.lang.Object

org.jdbi.v3.core.internal.JdbiClassUtils

public final class JdbiClassUtils
extends Object

Helper class for various internal reflection operations.

Field Summary

Fields

Modifier and Type	Field	Description
private static final Object[]	NO_ARGS

Constructor Summary

Constructors

Modifier	Constructor	Description
private	JdbiClassUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Optional<T>	createInstanceIfPossible(CheckedCallable<T> creator)	Creates a new instance from a CheckedCallable instance if possible.
static boolean	isPresent(String klass)	Returns true if a specific class can be loaded.
static Method	methodLookup(Class<?> klass, String methodName, Class<?>... parameterTypes)	Lookup a specific method name related to a class.
static Optional<Method>	safeMethodLookup(Class<?> klass, String methodName, Class<?>... parameterTypes)	Lookup a specific method name related to a class.
static Object[]	safeVarargs(Object... args)	Safely move arguments passed from from a varargs call to a call that expects an array of objects.
static Stream<Class<?>>	superTypes(Class<?> type)	Returns all supertypes to a given type.

Methods inherited from class java.lang.Object

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

Field Details

NO_ARGS

private static final Object[] NO_ARGS

Constructor Details

JdbiClassUtils

private JdbiClassUtils()

Method Details

isPresent

public static boolean isPresent(String klass)

Returns true if a specific class can be loaded.

Parameters:

klass - The class

Returns:

True if it can be loaded, false otherwise

methodLookup

public static Method methodLookup(Class<?> klass,
 String methodName,
 Class<?>... parameterTypes)

Lookup a specific method name related to a class. This helper tries Class.getMethod(String, Class[]) first, then falls back to Class.getDeclaredMethod(String, Class[]).

Parameters:

klass - A class

methodName - A method name

parameterTypes - All parameter types for the method

Returns:

A Method object

Throws:

IllegalStateException - If the method could not be found

safeMethodLookup

public static Optional<Method> safeMethodLookup(Class<?> klass,
 String methodName,
 Class<?>... parameterTypes)

Lookup a specific method name related to a class. This helper tries Class.getMethod(String, Class[]) first, then falls back to Class.getDeclaredMethod(String, Class[]).

Parameters:

klass - A class

methodName - A method name

parameterTypes - All parameter types for the method

Returns:

A Method object wrapped in an Optional if the method could be found, Optional.empty() otherwise

createInstanceIfPossible

public static <T> Optional<T> createInstanceIfPossible(CheckedCallable<T> creator)

Creates a new instance from a CheckedCallable instance if possible.

Type Parameters:

T - The type of the new instance

Parameters:

creator - A CheckedCallable instance which returns a new instance or throws any of the exceptions out of Class.getConstructor(Class[]) or Constructor.newInstance(Object...)

Returns:

A new instance wrapped in an Optional or Optional.empty() if a ReflectiveOperationException or SecurityException occured

superTypes

public static Stream<Class<?>> superTypes(Class<?> type)

Returns all supertypes to a given type.

Parameters:

type - A type

Returns:

A Stream of Class objects

safeVarargs

public static Object[] safeVarargs(Object... args)

Safely move arguments passed from from a varargs call to a call that expects an array of objects.

Parameters:

args - A list of objects. May be null or empty

Returns:

Returns an Array of objects. If the input was null, returns an empty array, otherwise all arguments as an array