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org.apache.gora.util
Class ReflectionUtils

java.lang.Object
  org.apache.gora.util.ReflectionUtils

public class ReflectionUtils
extends Object

Utility methods related to reflection

Field Summary

static Class<?>[]	EMPTY_CLASS_ARRAY
static Object[]	EMPTY_OBJECT_ARRAY

Constructor Summary

ReflectionUtils()

Method Summary

static <T> Constructor<T>	getConstructor(Class<T> clazz) Returns the empty argument constructor of the class.
static Object	getStaticField(Class<?> clazz, String fieldName) Returns the value of a named static field
static boolean	hasConstructor(Class<?> clazz) Returns whether the class defines an empty argument constructor.
static <T> T	newInstance(Class<T> clazz) Constructs a new instance of the class using the no-arg constructor.
static Object	newInstance(String classStr) Constructs a new instance of the class using the no-arg constructor.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_CLASS_ARRAY

public static Class<?>[] EMPTY_CLASS_ARRAY

EMPTY_OBJECT_ARRAY

public static Object[] EMPTY_OBJECT_ARRAY

Constructor Detail

ReflectionUtils

public ReflectionUtils()

Method Detail

getConstructor

public static <T> Constructor<T> getConstructor(Class<T> clazz)
                                     throws SecurityException,
                                            NoSuchMethodException

Returns the empty argument constructor of the class.

Throws:

SecurityException

NoSuchMethodException

hasConstructor

public static boolean hasConstructor(Class<?> clazz)
                              throws SecurityException,
                                     NoSuchMethodException

Returns whether the class defines an empty argument constructor.

Throws:

SecurityException

NoSuchMethodException

newInstance

public static <T> T newInstance(Class<T> clazz)
                     throws InstantiationException,
                            IllegalAccessException,
                            SecurityException,
                            NoSuchMethodException,
                            IllegalArgumentException,
                            InvocationTargetException

Constructs a new instance of the class using the no-arg constructor.

Parameters:

clazz - the class of the object

Returns:

a new instance of the object

Throws:

InstantiationException

IllegalAccessException

SecurityException

NoSuchMethodException

IllegalArgumentException

InvocationTargetException

newInstance

public static Object newInstance(String classStr)
                          throws InstantiationException,
                                 IllegalAccessException,
                                 ClassNotFoundException,
                                 SecurityException,
                                 IllegalArgumentException,
                                 NoSuchMethodException,
                                 InvocationTargetException

Constructs a new instance of the class using the no-arg constructor.

Parameters:

classStr - the class name of the object

Returns:

a new instance of the object

Throws:

InstantiationException

IllegalAccessException

ClassNotFoundException

SecurityException

IllegalArgumentException

NoSuchMethodException

InvocationTargetException

getStaticField

public static Object getStaticField(Class<?> clazz,
                                    String fieldName)
                             throws IllegalArgumentException,
                                    SecurityException,
                                    IllegalAccessException,
                                    NoSuchFieldException

Returns the value of a named static field

Throws:

IllegalArgumentException

SecurityException

IllegalAccessException

NoSuchFieldException