Package org.springframework.data.util

Class ClassUtils

java.lang.Object

org.springframework.data.util.ClassUtils

public abstract class ClassUtils
extends Object

Utility class to work with classes.

Since:

3.5

Author:

Oliver Gierke, Mark Paluch, Johannes Englmeier

Method Summary

Modifier and Type	Method	Description
static <T> @Nullable Constructor<T>	getDeclaredConstructorIfAvailable(Class<T> clazz, Class<?>... paramTypes)	Determine whether the given class has a public constructor with the given signature, and return it if available (else return null).
static void	ifPresent(String className, @Nullable ClassLoader classLoader, Consumer<Class<?>> action)	Determine whether the Class identified by the supplied className is present and can be loaded and call the action if the Class could be loaded.
static @Nullable Class<?>	loadIfPresent(String name, @Nullable ClassLoader classLoader)	Loads the class with the given name using the given ClassLoader.

Methods inherited from class java.lang.Object

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

Method Details

ifPresent

public static void ifPresent(String className,
 @Nullable ClassLoader classLoader,
 Consumer<Class<?>> action)

Determine whether the Class identified by the supplied className is present and can be loaded and call the action if the Class could be loaded.

Parameters:

className - the name of the class to check.

classLoader - the class loader to use (can be null, which indicates the default class loader).

action - the action callback to notify.

Throws:

IllegalStateException - if the corresponding class is resolvable but there was a readability mismatch in the inheritance hierarchy of the class (typically a missing dependency declaration in a Jigsaw module definition for a superclass or interface implemented by the class to be checked here)

loadIfPresent

public static @Nullable Class<?> loadIfPresent(String name,
 @Nullable ClassLoader classLoader)

Loads the class with the given name using the given ClassLoader.

Parameters:

name - the name of the class to be loaded.

classLoader - the class loader to use (can be null, which indicates the default class loader).

Returns:

the Class or null in case the class can't be loaded for any reason.

getDeclaredConstructorIfAvailable

public static <T> @Nullable Constructor<T> getDeclaredConstructorIfAvailable(Class<T> clazz,
 Class<?>... paramTypes)

Determine whether the given class has a public constructor with the given signature, and return it if available (else return null).

Essentially translates NoSuchMethodException to null.

Parameters:

clazz - the clazz to analyze

paramTypes - the parameter types of the method

Returns:

the constructor, or null if not found

Since:

4.0

See Also:

• Class.getDeclaredConstructor(java.lang.Class<?>...)