com.aliyun.odps.utils

类 ReflectionUtils

java.lang.Object

com.aliyun.odps.utils.ReflectionUtils

public class ReflectionUtils
extends Object

General reflection utilities

构造器概要

构造器

构造器和说明
ReflectionUtils()

方法概要

方法

限定符和类型	方法和说明
static void	checkNonStaticField(Class<?> userImplClass, Class<?> parentClass)
static void	cloneWritableInto(Writable dst, Writable src) 已过时。
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) Find a declared method in a class
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.

从类继承的方法 java.lang.Object

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

构造器详细资料

ReflectionUtils

public ReflectionUtils()

方法详细资料

setConf

public static void setConf(Object theObject,
           Configuration conf)

Check and set 'configuration' if necessary.

参数:

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

参数:

theClass - class of which an object is created

conf - Configuration

返回:

a new object

newInstanceFast

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

Instantiate classes that are ImmmutableClasssesGiraphConfigurable

类型参数:

T - Type to instantiate

参数:

theClass - Class to instantiate

configuration - Graph configuration, may be null

返回:

Newly instantiated object with configuration set if possible

findUserClassMethod

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

Find a declared method in a class

参数:

inClass - Class to search for declared field.

methodname - Method name to search for

返回:

Method or will return null.

getClass

public static Class<?> getClass(Type type)

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

参数:

type - the type

返回:

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.

参数:

target - Target to set the field on.

fieldname - Name of field.

value - Value to set on target.

抛出:

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

参数:

inClass - Class to search for declared field.

fieldname - Field name to search for

返回:

Field or will throw.

抛出:

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

参数:

inClass - Class to search for declared field.

methodname - Method name to search for

返回:

Method or will throw.

抛出:

NoSuchMethodException - When method not found.

findDeclaredMethod

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

Find a declared method in a class

参数:

inClass - Class to search for declared field.

methodname - Method name to search for

返回:

Method or will throw.

抛出:

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.

类型参数:

T - Type to evaluate.

参数:

baseClass - the base class

childClass - the child class

返回:

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

已过时。

抛出:

IOException