org.apache.pulsar.common.util

Class Reflections

java.lang.Object

org.apache.pulsar.common.util.Reflections

public class Reflections
extends Object

Utils related to reflections.

Constructor Summary

Constructors

Constructor and Description
Reflections()

Method Summary

Modifier and Type	Method and Description
static boolean	classExists(String fqcn) Check if class exists.
static boolean	classExistsInJar(File jar, String fqcn) Check if a class is in a jar.
static boolean	classImplementsIface(String fqcn, Class xface) check if class implements interface.
static boolean	classInJarImplementsIface(File jar, String fqcn, Class xface) check if a class implements an interface.
static <T> T	createInstance(String userClassName, Class<T> xface, ClassLoader classLoader) Create an instance of userClassName using provided classLoader.
static Object	createInstance(String userClassName, ClassLoader classLoader) Create an instance of userClassName using provided classLoader.
static Object	createInstance(String userClassName, ClassLoader classLoader, Object[] params, Class[] paramTypes)
static Object	createInstance(String userClassName, File jar)
static List<Field>	getAllFields(Class<?> type)
static Class	loadClass(String className, ClassLoader classLoader) Load class to resolve array types.

Methods inherited from class java.lang.Object

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

Constructor Detail

Reflections

public Reflections()

Method Detail

createInstance

public static <T> T createInstance(String userClassName,
                                   Class<T> xface,
                                   ClassLoader classLoader)

Create an instance of userClassName using provided classLoader. This instance should implement the provided interface xface.

Parameters:

userClassName - user class name

xface - the interface that the reflected instance should implement

classLoader - class loader to load the class.

Returns:

the instance

createInstance

public static Object createInstance(String userClassName,
                                    ClassLoader classLoader)

Create an instance of userClassName using provided classLoader.

Parameters:

userClassName - user class name

classLoader - class loader to load the class.

Returns:

the instance

createInstance

public static Object createInstance(String userClassName,
                                    ClassLoader classLoader,
                                    Object[] params,
                                    Class[] paramTypes)

createInstance

public static Object createInstance(String userClassName,
                                    File jar)

classExistsInJar

public static boolean classExistsInJar(File jar,
                                       String fqcn)

Check if a class is in a jar.

Parameters:

jar - location of the jar

fqcn - fully qualified class name to search for in jar

Returns:

true if class can be loaded from jar and false if otherwise

classExists

public static boolean classExists(String fqcn)

Check if class exists.

Parameters:

fqcn - fully qualified class name to search for

Returns:

true if class can be loaded from jar and false if otherwise

classInJarImplementsIface

public static boolean classInJarImplementsIface(File jar,
                                                String fqcn,
                                                Class xface)

check if a class implements an interface.

Parameters:

fqcn - fully qualified class name to search for in jar

xface - interface to check if implement

Returns:

true if class from jar implements interface xface and false if otherwise

classImplementsIface

public static boolean classImplementsIface(String fqcn,
                                           Class xface)

check if class implements interface.

Parameters:

fqcn - fully qualified class name

xface - the interface the fqcn should implement

Returns:

true if class implements interface xface and false if otherwise

loadClass

public static Class loadClass(String className,
                              ClassLoader classLoader)
                       throws ClassNotFoundException

Load class to resolve array types.

Parameters:

className - class name

classLoader - class loader

Returns:

loaded class

Throws:

ClassNotFoundException

getAllFields

public static List<Field> getAllFields(Class<?> type)