com.aliyun.odps.utils

Class ReflectionUtils

java.lang.Object

com.aliyun.odps.utils.ReflectionUtils

public class ReflectionUtils
extends Object

General reflection utilities

Constructor Summary

Constructors

Constructor and Description
ReflectionUtils()

Method Summary

Modifier and Type	Method and Description
static void	checkNonStaticField(Class<?> userImplClass, Class<?> parentClass)
static void	cloneWritableInto(Writable dst, Writable src) Deprecated.
static Field	findDeclaredField(Class<?> inClass, String fieldname) Find a declared field in a class or one of its super classes
static Method	findDeclaredMethod(Class<?> inClass, String methodName) Find a declared method in a class
static Method	findDeclaredMethodRecursive(Class<?> inClass, String methodName) Find a declared method in a class or one of its super classes
static Method	findUserClassMethod(Class<?> inClass, String methodName) Deprecated.
static List<Method>	findUserClassMethods(Class<?> inClass, String methodName) Find declared methods in a class by method name
static Class<?>	getClass(Type type) Get the underlying class for a type, or null if the type is a variable type.
static <T> List<Class<?>>	getTypeArguments(Class<T> baseClass, Class<? extends T> childClass) Get the actual type arguments a child class has used to extend a generic base class.
static <T> T	newInstance(Class<T> theClass, Configuration conf) Create an object for the given class and initialize it from conf
static <T> T	newInstanceFast(Class<T> theClass, Configuration configuration) Instantiate classes that are ImmmutableClasssesGiraphConfigurable
static void	setConf(Object theObject, Configuration conf) Check and set 'configuration' if necessary.
static void	setField(Object target, String fieldname, Object value) Try to directly set a (possibly private) field on an Object.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtils

public ReflectionUtils()

Method Detail

setConf

public static void setConf(Object theObject,
                           Configuration conf)

Check and set 'configuration' if necessary.

Parameters:

theObject - object for which to set configuration

conf - Configuration

newInstance

public static <T> T newInstance(Class<T> theClass,
                                Configuration conf)

Create an object for the given class and initialize it from conf

Parameters:

theClass - class of which an object is created

conf - Configuration

Returns:

a new object

newInstanceFast

public static <T> T newInstanceFast(Class<T> theClass,
                                    Configuration configuration)

Instantiate classes that are ImmmutableClasssesGiraphConfigurable

Type Parameters:

T - Type to instantiate

Parameters:

theClass - Class to instantiate

configuration - Graph configuration, may be null

Returns:

Newly instantiated object with configuration set if possible

findUserClassMethod

@Deprecated
public static Method findUserClassMethod(Class<?> inClass,
                                                     String methodName)

Deprecated.

Find a declared method in a class

Parameters:

inClass - Class to search for declared field.

methodName - Method name to search for

Returns:

Method or will return null.

findUserClassMethods

public static List<Method> findUserClassMethods(Class<?> inClass,
                                                String methodName)

Find declared methods in a class by method name

Parameters:

inClass - Class to search for declared field.

methodName - Method name to search for

Returns:

list of Methods, empty if not found.

getClass

public static Class<?> getClass(Type type)

Get the underlying class for a type, or null if the type is a variable type.

Parameters:

type - the type

Returns:

the underlying class

setField

public static void setField(Object target,
                            String fieldname,
                            Object value)
                     throws NoSuchFieldException,
                            IllegalAccessException

Try to directly set a (possibly private) field on an Object.

Parameters:

target - Target to set the field on.

fieldname - Name of field.

value - Value to set on target.

Throws:

NoSuchFieldException

IllegalAccessException

findDeclaredField

public static Field findDeclaredField(Class<?> inClass,
                                      String fieldname)
                               throws NoSuchFieldException

Find a declared field in a class or one of its super classes

Parameters:

inClass - Class to search for declared field.

fieldname - Field name to search for

Returns:

Field or will throw.

Throws:

NoSuchFieldException - When field not found.

findDeclaredMethodRecursive

public static Method findDeclaredMethodRecursive(Class<?> inClass,
                                                 String methodName)
                                          throws NoSuchMethodException

Find a declared method in a class or one of its super classes

Parameters:

inClass - Class to search for declared field.

methodName - Method name to search for

Returns:

Method or will throw.

Throws:

NoSuchMethodException - When method not found.

findDeclaredMethod

public static Method findDeclaredMethod(Class<?> inClass,
                                        String methodName)

Find a declared method in a class

Parameters:

inClass - Class to search for declared field.

methodName - Method name to search for

Returns:

Method or will throw.

Throws:

NoSuchMethodException - When method not found.

getTypeArguments

public static <T> List<Class<?>> getTypeArguments(Class<T> baseClass,
                                                  Class<? extends T> childClass)

Get the actual type arguments a child class has used to extend a generic base class.

Type Parameters:

T - Type to evaluate.

Parameters:

baseClass - the base class

childClass - the child class

Returns:

a list of the raw classes for the actual type arguments.

checkNonStaticField

public static void checkNonStaticField(Class<?> userImplClass,
                                       Class<?> parentClass)

cloneWritableInto

@Deprecated
public static void cloneWritableInto(Writable dst,
                                                 Writable src)
                                          throws IOException

Deprecated.

Throws:

IOException