Package org.springframework.data.repository.util

Class ClassUtils

java.lang.Object

org.springframework.data.repository.util.ClassUtils

public abstract class ClassUtils
extends Object

Utility class to work with classes.

Author:

Oliver Gierke, Mark Paluch, Johannes Englmeier

Method Summary

Modifier and Type	Method	Description
static void	assertReturnTypeAssignable(Method method, Class<?>... types)	Asserts the given Method's return type to be one of the given types.
static int	getNumberOfOccurences(Method method, Class<?> type)	Deprecated. Use getNumberOfOccurrences(Method, Class).
static int	getNumberOfOccurrences(Method method, Class<?> parameterType)	Returns the number of occurrences for the given parameter type in the given Method.
static boolean	hasParameterOfType(Method method, Class<?> type)	Returns whether the given Method has a parameter of the given type.
static boolean	hasProperty(Class<?> type, String property)	Returns whether the given class contains a property with the given name.
static void	ifPresent(String className, 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 boolean	isGenericRepositoryInterface(Class<?> interfaze)	Returns wthere the given type is the Repository interface.
static boolean	isGenericRepositoryInterface(String interfaceName)	Returns whether the given type name is a repository interface name.
static boolean	isOfType(Object object, Collection<Class<?>> types)	Returns whether the given object is of one of the given types.
static void	unwrapReflectionException(Exception ex)	Helper method to extract the original exception that can possibly occur during a reflection call.

Methods inherited from class java.lang.Object

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

Method Details

hasProperty

public static boolean hasProperty(Class<?> type,
 String property)

Returns whether the given class contains a property with the given name.

Parameters:

type -

property -

Returns:

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.

action - the action callback to notify. (may be null which indicates the default class loader)

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)

isGenericRepositoryInterface

public static boolean isGenericRepositoryInterface(Class<?> interfaze)

Returns wthere the given type is the Repository interface.

Parameters:

interfaze -

Returns:

isGenericRepositoryInterface

public static boolean isGenericRepositoryInterface(@Nullable
 String interfaceName)

Returns whether the given type name is a repository interface name.

Parameters:

interfaceName -

Returns:

getNumberOfOccurences

@Deprecated
public static int getNumberOfOccurences(@NonNull
 Method method,
 @NonNull
 Class<?> type)

Deprecated.

Use getNumberOfOccurrences(Method, Class).

getNumberOfOccurrences

public static int getNumberOfOccurrences(@NonNull
 Method method,
 @NonNull
 Class<?> parameterType)

Returns the number of occurrences for the given parameter type in the given Method.

Parameters:

method - Method to evaluate.

parameterType - Class of the Method parameter type to count.

Returns:

the number of occurrences for the given parameter type in the given Method.

See Also:

• Method.getParameterTypes()

assertReturnTypeAssignable

public static void assertReturnTypeAssignable(Method method,
 Class<?>... types)

Asserts the given Method's return type to be one of the given types. Will unwrap known wrapper types before the assignment check (see QueryExecutionConverters).

Parameters:

method - must not be null.

types - must not be null or empty.

isOfType

public static boolean isOfType(@Nullable
 Object object,
 Collection<Class<?>> types)

Returns whether the given object is of one of the given types. Will return false for null.

Parameters:

object -

types -

Returns:

hasParameterOfType

public static boolean hasParameterOfType(Method method,
 Class<?> type)

Returns whether the given Method has a parameter of the given type.

Parameters:

method -

type -

Returns:

unwrapReflectionException

public static void unwrapReflectionException(Exception ex)
                                      throws Throwable

Helper method to extract the original exception that can possibly occur during a reflection call.

Parameters:

ex -

Throws:

Throwable