org.apache.hudi.common.util

Class ReflectionUtils

java.lang.Object

org.apache.hudi.common.util.ReflectionUtils

public class ReflectionUtils
extends Object

A utility class for reflection.

Constructor Summary

Constructors

Constructor and Description
ReflectionUtils()

Method Summary

Modifier and Type	Method and Description
static Class<?>	getClass(String clazzName)
static Stream<String>	getTopLevelClassesInClasspath(Class<?> clazz) Scans all classes accessible from the context class loader which belong to the given package and subpackages.
static boolean	hasConstructor(String clazz, Class<?>[] constructorArgTypes) Check if the clazz has the target constructor or not.
static boolean	isSameClass(Comparable<?> v, Comparable<?> o) Returns whether the given two comparable values come from the same runtime class.
static <T> T	loadClass(String className)
static Object	loadClass(String clazz, Class<?>[] constructorArgTypes, Object... constructorArgs) Creates an instance of the given class.
static Object	loadClass(String clazz, Object... constructorArgs) Creates an instance of the given class.
static <T extends HoodieRecordPayload> T	loadPayload(String recordPayloadClass, Object[] payloadArgs, Class<?>... constructorArgTypes) Instantiate a given class with a generic record payload.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtils

public ReflectionUtils()

Method Detail

getClass

public static Class<?> getClass(String clazzName)

loadClass

public static <T> T loadClass(String className)

loadPayload

public static <T extends HoodieRecordPayload> T loadPayload(String recordPayloadClass,
                                                            Object[] payloadArgs,
                                                            Class<?>... constructorArgTypes)

Instantiate a given class with a generic record payload.

loadClass

public static Object loadClass(String clazz,
                               Class<?>[] constructorArgTypes,
                               Object... constructorArgs)

Creates an instance of the given class. Use this version when dealing with interface types as constructor args.

hasConstructor

public static boolean hasConstructor(String clazz,
                                     Class<?>[] constructorArgTypes)

Check if the clazz has the target constructor or not. When catch HoodieException from loadClass(java.lang.String), it's inconvenient to say if the exception was thrown due to the instantiation's own logic or missing constructor. TODO: ReflectionUtils should throw a specific exception to indicate Reflection problem.

loadClass

public static Object loadClass(String clazz,
                               Object... constructorArgs)

Creates an instance of the given class. Constructor arg types are inferred.

getTopLevelClassesInClasspath

public static Stream<String> getTopLevelClassesInClasspath(Class<?> clazz)

Scans all classes accessible from the context class loader which belong to the given package and subpackages.

Parameters:

clazz - class

Returns:

Stream of Class names in package

isSameClass

public static boolean isSameClass(Comparable<?> v,
                                  Comparable<?> o)

Returns whether the given two comparable values come from the same runtime class.