Package grails.util

Class GrailsMetaClassUtils

java.lang.Object

grails.util.GrailsMetaClassUtils

public final class GrailsMetaClassUtils
extends Object

Provides utility methods for working with the Groovy MetaClass API.

Since:

0.5

Method Summary

Modifier and Type	Method	Description
static void	copyExpandoMetaClass(Class<?> fromClass, Class<?> toClass, boolean removeSource)	Copies the ExpandoMetaClass dynamic methods and properties from one Class to another.
static groovy.lang.ExpandoMetaClass	getExpandoMetaClass(Class<?> aClass)
static groovy.lang.MetaClass	getMetaClass(Object instance)
static Object	getPropertyIfExists(Object instance, String property)	Obtains a property of an instance if it exists
static <T> T	getPropertyIfExists(Object instance, String property, Class<T> requiredType)	Obtains a property of an instance if it exists
static groovy.lang.MetaClassRegistry	getRegistry()	Retrieves the MetaClassRegistry instance.
static Object	invokeMethodIfExists(Object instance, String methodName)	Invokes a method if it exists otherwise returns null
static Object	invokeMethodIfExists(Object instance, String methodName, Object[] args)	Invokes a method if it exists otherwise returns null

Methods inherited from class java.lang.Object

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

Method Details

getRegistry

public static groovy.lang.MetaClassRegistry getRegistry()

Retrieves the MetaClassRegistry instance.

Returns:

The registry

copyExpandoMetaClass

public static void copyExpandoMetaClass(Class<?> fromClass,
 Class<?> toClass,
 boolean removeSource)

Copies the ExpandoMetaClass dynamic methods and properties from one Class to another.

Parameters:

fromClass - The source class

toClass - The destination class

removeSource - Whether to remove the source class after completion. True if yes

getExpandoMetaClass

public static groovy.lang.ExpandoMetaClass getExpandoMetaClass(Class<?> aClass)

getMetaClass

public static groovy.lang.MetaClass getMetaClass(Object instance)

getPropertyIfExists

public static Object getPropertyIfExists(Object instance,
 String property)

Obtains a property of an instance if it exists

Parameters:

instance - The instance

property - The property

Returns:

The value of null if non-exists

getPropertyIfExists

public static <T> T getPropertyIfExists(Object instance,
 String property,
 Class<T> requiredType)

Obtains a property of an instance if it exists

Parameters:

instance - The instance

property - The property

requiredType - The required type of the property

Returns:

The property value

invokeMethodIfExists

public static Object invokeMethodIfExists(Object instance,
 String methodName)

Invokes a method if it exists otherwise returns null

Parameters:

instance - The instance

methodName - The method name

Returns:

The result of the method call or null

invokeMethodIfExists

public static Object invokeMethodIfExists(Object instance,
 String methodName,
 Object[] args)

Invokes a method if it exists otherwise returns null

Parameters:

instance - The instance

methodName - The method name

args - The arguments

Returns:

The result of the method call or null