GrailsMetaClassUtils (Grails 6.2.1)

grails.util.GrailsMetaClassUtils

```
public class GrailsMetaClassUtils
extends java.lang.Object
```
Provides utility methods for working with the Groovy MetaClass API.
Authors:
Graeme Rocher
Since:
0.5

Field Summary

Fields
Modifiers	Name	Description
`private static org.apache.commons.logging.Log`	`LOG`
`private static int`	`MAX_DELEGATE_LEVELS`
`private static java.lang.Object[]`	`NO_ARGS`

Methods Summary

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

Inherited Methods Summary

Inherited Methods
Methods inherited from class	Name
`class java.lang.Object`	`java.lang.Object#wait(long, int), java.lang.Object#wait(), java.lang.Object#wait(long), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()`

- Field Detail
  - private static final org.apache.commons.logging.Log LOG
  - private static final int MAX_DELEGATE_LEVELS
  - private static final java.lang.Object[] NO_ARGS
- Method Detail
  - @java.lang.SuppressWarnings({ "unchecked", "rawtypes" }) public static void copyExpandoMetaClass(java.lang.Class<?> fromClass, java.lang.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
  - public static groovy.lang.ExpandoMetaClass getExpandoMetaClass(java.lang.Class<?> aClass)
  - public static groovy.lang.MetaClass getMetaClass(java.lang.Object instance)
  - public static java.lang.Object getPropertyIfExists(java.lang.Object instance, java.lang.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
  - <T> @java.lang.SuppressWarnings("unchecked") public static T getPropertyIfExists(java.lang.Object instance, java.lang.String property, java.lang.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
  - public static groovy.lang.MetaClassRegistry getRegistry()
    
    Retrieves the MetaClassRegistry instance.
    Returns:
    The registry
  - public static java.lang.Object invokeMethodIfExists(java.lang.Object instance, java.lang.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
  - public static java.lang.Object invokeMethodIfExists(java.lang.Object instance, java.lang.String methodName, java.lang.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
  - private static groovy.lang.MetaClass unwrapDelegatingMetaClass(groovy.lang.MetaClass metaClass)

Summary:
Field
Method

| Detail:
Field
Method

Groovy Documentation

[Java] Class GrailsMetaClassUtils

Field Summary

Methods Summary

Inherited Methods Summary

Field Detail

private static final org.apache.commons.logging.Log LOG

private static final int MAX_DELEGATE_LEVELS

private static final java.lang.Object[] NO_ARGS

Method Detail

@java.lang.SuppressWarnings({ "unchecked", "rawtypes" }) public static void copyExpandoMetaClass(java.lang.Class<?> fromClass, java.lang.Class<?> toClass, boolean removeSource)

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

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

public static java.lang.Object getPropertyIfExists(java.lang.Object instance, java.lang.String property)

<T> @java.lang.SuppressWarnings("unchecked") public static T getPropertyIfExists(java.lang.Object instance, java.lang.String property, java.lang.Class<T> requiredType)

public static groovy.lang.MetaClassRegistry getRegistry()

public static java.lang.Object invokeMethodIfExists(java.lang.Object instance, java.lang.String methodName)

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

private static groovy.lang.MetaClass unwrapDelegatingMetaClass(groovy.lang.MetaClass metaClass)