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## groovy.lang
Class MetaClassImpl

    java.lang.Object
      groovy.lang.MetaClassImpl

All Implemented Interfaces:
  MetaClass, MetaObjectProtocol, MutableMetaClass

Direct Known Subclasses:
  ClosureMetaClass, ExpandoMetaClass, ProxyMetaClass

    public class MetaClassImpl

extends Object
implements MetaClass, MutableMetaClass

Allows methods to be dynamically added to existing classes at runtime

Version:
  $Revision: 13294 $
Author:
  James Strachan, Guillaume Laforge, Jochen Theodorou, Graeme Rocher, Alex Tkachman
See Also:
  `MetaClass`

Nested Class Summary
`static class` | `MetaClassImpl.Index`

Field Summary
`protected static Class[]` | `EMPTY_CLASS_ARRAY`
`protected boolean` | `isGroovyObject`
`protected boolean` | `isMap`
`protected static Logger` | `LOG`
`protected static String` | `METHOD_MISSING`
`protected static String` | `PROPERTY_MISSING`
`protected MetaClassRegistry` | `registry`
`protected static String` | `STATIC_METHOD_MISSING`
`protected static String` | `STATIC_PROPERTY_MISSING`
`protected CachedClass` | `theCachedClass`
`protected Class` | `theClass`

Constructor Summary
`MetaClassImpl(Class theClass)`
`MetaClassImpl(MetaClassRegistry registry, Class theClass)`

Method Summary
`void` | `addMetaBeanProperty(MetaBeanProperty mp)` Adds a new MetaBeanProperty to this MetaClass
`void` | `addMetaMethod(MetaMethod method)` adds a MetaMethod to this class.
`void` | `addNewInstanceMethod(Method method)` adds a new instance method to this MetaClass.
`void` | `addNewStaticMethod(Method method)` adds a new static method to this MetaClass.
`protected void` | `checkInitalised()` checks if the initialisation of the class id complete.
`protected void` | `clearInvocationCaches()` remove all method call cache entries.
`protected void` | `dropMethodCache(String name)`
`protected void` | `dropStaticMethodCache(String name)`
`Object` | `getAttribute(Class sender, Object receiver, String messageName, boolean useSuper)` Retrieves the value of an attribute (field).
`Object` | `getAttribute(Class sender, Object object, String attribute, boolean useSuper, boolean fromInsideClass)` Looks up the given attribute (field) on the given object
`Object` | `getAttribute(Object object, String attribute)` Retrieves an attribute of an instance of the class returned by the getTheClass() method.
`ClassNode` | `getClassNode()` Obtains a reference to the original AST for the MetaClass if it is available at runtime
`MetaMethod` | `getMetaMethod(String name, Object[] argTypes)` Retrieves an instance MetaMethod for the given name and argument values, using the types of the argument values to establish the chosen MetaMethod
`List` | `getMetaMethods()` Retrieves a list of MetaMethod instances held by this class
`MetaProperty` | `getMetaProperty(String name)` Returns a MetaProperty for the given name or null if it doesn't exist
`List` | `getMethods()` Retrieves a list of MetaMethods held by the class
`MetaMethod` | `getMethodWithCaching(Class sender, String methodName, Object[] arguments, boolean isCallToSuper)`
`MetaMethod` | `getMethodWithoutCaching(Class sender, String methodName, Class[] arguments, boolean isCallToSuper)`
`List` | `getProperties()` Get all the properties defined for this type
`Object` | `getProperty(Class sender, Object object, String name, boolean useSuper, boolean fromInsideClass)` Retrieves a property on the given receiver for the specified arguments.
`Object` | `getProperty(Object object, String property)` Retrieves a property of an instance of the class returned by the getTheClass() method.
`MetaMethod` | `getStaticMetaMethod(String name, Object[] argTypes)` Retreives a static MetaMethod for the given name and argument values, using the types of the arguments to establish the chosen MetaMethod
`Class` | `getTheClass()` Retrieves that Java Class that the attached Meta behaviours apply to
`MetaProperty` | `hasProperty(Object obj, String name)` Returns true of the implementing MetaClass has a property of the given name Note that this method will only return true for realised properties and does not take into account implementation of getProperty or propertyMissing
`void` | `initialize()` complete the initlialisation process.
`Object` | `invokeConstructor(Object[] arguments)` Invokes a constructor for the given arguments.
`Object` | `invokeConstructorAt(Class at, Object[] arguments)` Deprecated. use invokeConstructor instead
`Object` | `invokeMethod(Class sender, Object object, String methodName, Object[] originalArguments, boolean isCallToSuper, boolean fromInsideClass)` Invokes the given method on the object.
`Object` | `invokeMethod(Object object, String methodName, Object arguments)` Invokes a method on the given object, with the given name and single argument.
`Object` | `invokeMethod(Object object, String methodName, Object[] originalArguments)` Invokes the given method on the object.
`Object` | `invokeMissingMethod(Object instance, String methodName, Object[] arguments)` Attempts to invoke the methodMissing method otherwise throws a MissingMethodException
`Object` | `invokeMissingProperty(Object instance, String propertyName, Object optionalValue, boolean isGetter)` Invokes the propertyMissing method otherwise throws a MissingPropertyException
`Object` | `invokeStaticMethod(Object object, String methodName, Object[] arguments)` Invokes a static method on the given Object with the given name and arguments.
`protected Object` | `invokeStaticMissingProperty(Object instance, String propertyName, Object optionalValue, boolean isGetter)` Hook to deal with the case of MissingProperty for static properties.
`boolean` | `isGroovyObject()`
`protected boolean` | `isInitialized()`
`boolean` | `isModified()` Return whether the MetaClass has been modified or not
`MetaMethod` | `pickMethod(String methodName, Class[] arguments)` Selects a method by name and argument classes.
`List` | `respondsTo(Object obj, String name)` Returns an object satisfying Groovy truth if the implementing MetaClass responds to a method with the given name regardless of arguments.
`List` | `respondsTo(Object obj, String name, Object[] argTypes)` Returns an object satisfying Groovy truth if the implementing MetaClass responds to a method with the given name and arguments types.
`Constructor` | `retrieveConstructor(Class[] argClasses)`
`protected MetaMethod` | `retrieveMethod(String methodName, Class[] arguments)` Deprecated. use pickMethod instead
`MetaMethod` | `retrieveStaticMethod(String methodName, Object[] arguments)`
`int` | `selectConstructorAndTransformArguments(int numberOfCosntructors, Object[] arguments)` Internal method to support Groovy runtime.
`void` | `setAttribute(Class sender, Object object, String attribute, Object newValue, boolean useSuper, boolean fromInsideClass)` Sets the given attribute (field) on the given object
`void` | `setAttribute(Object object, String attribute, Object newValue)` Sets an attribute of an instance of the class returned by the getTheClass() method.
`void` | `setProperties(Object bean, Map map)` Sets a number of bean properties from the given Map where the keys are the String names of properties and the values are the values of the properties to set
`void` | `setProperty(Class sender, Object object, String name, Object newValue, boolean useSuper, boolean fromInsideClass)` Sets the property value on an object
`void` | `setProperty(Object object, String property, Object newValue)` Sets a property of an instance of the class returned by the getTheClass() method.
`String` | `toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### STATIC_METHOD_MISSING

    protected static final String STATIC_METHOD_MISSING

See Also:
  Constant Field Values

### STATIC_PROPERTY_MISSING

    protected static final String STATIC_PROPERTY_MISSING

See Also:
  Constant Field Values

### METHOD_MISSING

    protected static final String METHOD_MISSING

See Also:
  Constant Field Values

### PROPERTY_MISSING

    protected static final String PROPERTY_MISSING

See Also:
  Constant Field Values

### LOG

    protected static final Logger LOG

### theClass

    protected final Class theClass

### theCachedClass

    protected final CachedClass theCachedClass

### registry

    protected MetaClassRegistry registry

### isGroovyObject

    protected final boolean isGroovyObject

### isMap

    protected final boolean isMap

### EMPTY_CLASS_ARRAY

    protected static final Class[] EMPTY_CLASS_ARRAY

Constructor Detail

### MetaClassImpl

    public MetaClassImpl(Class theClass)

### MetaClassImpl

    public MetaClassImpl(MetaClassRegistry registry,
                         Class theClass)

Method Detail

### respondsTo

    public List respondsTo(Object obj,
                           String name,
                           Object[] argTypes)

  Description copied from interface: `MetaObjectProtocol`

  Returns an object satisfying Groovy truth if the implementing MetaClass responds to a method with the given name and arguments types.

  Note that this method's return value is based on realised methods and does not take into account objects or classes that implement invokeMethod or methodMissing

  This method is "safe" in that it will always return a value and never throw an exception

  Specified by:
    `respondsTo` in interface `MetaObjectProtocol`
  Parameters:
    `obj` - The object to inspect
    `name` - The name of the method of interest
    `argTypes` - The argument types to match against
  Returns:
    A List of MetaMethods matching the argument types which will be empty if no matching methods exist
  See Also:
    `MetaObjectProtocol.respondsTo(Object,String, Object[])`

### respondsTo

    public List respondsTo(Object obj,
                           String name)

  Description copied from interface: `MetaObjectProtocol`

  Returns an object satisfying Groovy truth if the implementing MetaClass responds to a method with the given name regardless of arguments. In other words this method will return for foo() and foo(String).

  Note that this method's return value is based on realised methods and does not take into account objects or classes that implement invokeMethod or methodMissing

  This method is "safe" in that it will always return a value and never throw an exception

  Specified by:
    `respondsTo` in interface `MetaObjectProtocol`
  Parameters:
    `obj` - The object to inspect
    `name` - The name of the method of interest
  Returns:
    A List of MetaMethods which will be empty if no methods with the given name exist
  See Also:
    `MetaObjectProtocol.respondsTo(Object,String, Object[])`

### hasProperty

    public MetaProperty hasProperty(Object obj,
                                    String name)

  Description copied from interface: `MetaObjectProtocol`

  Returns true of the implementing MetaClass has a property of the given name

  Note that this method will only return true for realised properties and does not take into account implementation of getProperty or propertyMissing

  Specified by:
    `hasProperty` in interface `MetaObjectProtocol`
  Parameters:
    `obj` - The object to inspect
    `name` - The name of the property
  Returns:
    The MetaProperty or null if it doesn't exist
  See Also:
    `MetaObjectProtocol.hasProperty(Object,String)`

### getMetaProperty

    public MetaProperty getMetaProperty(String name)

  Description copied from interface: `MetaObjectProtocol`
  Returns a MetaProperty for the given name or null if it doesn't exist

  Specified by:
    `getMetaProperty` in interface `MetaObjectProtocol`
  Parameters:
    `name` - The name of the MetaProperty
  Returns:
    A MetaProperty or null
  See Also:
    `MetaObjectProtocol.getMetaProperty(String)`

### getStaticMetaMethod

    public MetaMethod getStaticMetaMethod(String name,
                                          Object[] argTypes)

  Description copied from interface: `MetaObjectProtocol`
  Retreives a static MetaMethod for the given name and argument values, using the types of the arguments to establish the chosen MetaMethod

  Specified by:
    `getStaticMetaMethod` in interface `MetaObjectProtocol`
  Parameters:
    `name` - The name of the MetaMethod
    `argTypes` - The argument types
  Returns:
    A MetaMethod or null if it doesn't exist
  See Also:
    `MetaObjectProtocol.getStaticMetaMethod(String, Object[])`

### getMetaMethod

    public MetaMethod getMetaMethod(String name,
                                    Object[] argTypes)

  Description copied from interface: `MetaObjectProtocol`
  Retrieves an instance MetaMethod for the given name and argument values, using the types of the argument values to establish the chosen MetaMethod

  Specified by:
    `getMetaMethod` in interface `MetaObjectProtocol`
  Parameters:
    `name` - The name of the MetaMethod
    `argTypes` - The argument types
  Returns:
    A MetaMethod or null if it doesn't exist
  See Also:
    `MetaObjectProtocol.getMetaMethod(String, Object[])`

### getTheClass

    public Class getTheClass()

  Description copied from interface: `MetaObjectProtocol`
  Retrieves that Java Class that the attached Meta behaviours apply to

  Specified by:
    `getTheClass` in interface `MetaObjectProtocol`
  Returns:
    The java.lang.Class instance

### isGroovyObject

    public boolean isGroovyObject()

### isModified

    public boolean isModified()

  Description copied from interface: `MutableMetaClass`
  Return whether the MetaClass has been modified or not

  Specified by:
    `isModified` in interface `MutableMetaClass`
  Returns:
    True if it has

### addNewInstanceMethod

    public void addNewInstanceMethod(Method method)

  Description copied from interface: `MutableMetaClass`
  adds a new instance method to this MetaClass. Instance methods are able to overwrite the original methods of the class. Calling this method should not be done after initlise was called.

  Specified by:
    `addNewInstanceMethod` in interface `MutableMetaClass`
  Parameters:
    `method` - the method to be added

### addNewStaticMethod

    public void addNewStaticMethod(Method method)

  Description copied from interface: `MutableMetaClass`
  adds a new static method to this MetaClass. This is only possible as long as initilise was not called.

  Specified by:
    `addNewStaticMethod` in interface `MutableMetaClass`
  Parameters:
    `method` - the method to be added

### invokeMethod

    public Object invokeMethod(Object object,
                               String methodName,
                               Object arguments)

  Description copied from interface: `MetaObjectProtocol`

  Invokes a method on the given object, with the given name and single argument.

  Specified by:
    `invokeMethod` in interface `MetaObjectProtocol`
  Parameters:
    `object` - The Object to invoke the method on
    `methodName` - The name of the method
    `arguments` - The argument to the method
  Returns:
    The return value of the method which is null if the return type is void
  See Also:
    `MetaObjectProtocol.invokeMethod(Object, String, Object[])`

### invokeMissingMethod

    public Object invokeMissingMethod(Object instance,
                                      String methodName,
                                      Object[] arguments)

  Description copied from interface: `MetaClass`

  Attempts to invoke the methodMissing method otherwise throws a MissingMethodException

  Specified by:
    `invokeMissingMethod` in interface `MetaClass`
  Parameters:
    `instance` - The instance to invoke methodMissing on
    `methodName` - The name of the method
    `arguments` - The arguments to the method
  Returns:
    The results of methodMissing or throws MissingMethodException
  See Also:
    `MissingMethodException`

### invokeMissingProperty

    public Object invokeMissingProperty(Object instance,
                                        String propertyName,
                                        Object optionalValue,
                                        boolean isGetter)

  Description copied from interface: `MetaClass`
  Invokes the propertyMissing method otherwise throws a MissingPropertyException

  Specified by:
    `invokeMissingProperty` in interface `MetaClass`
  Parameters:
    `instance` - The instance of the class
    `propertyName` - The name of the property
    `optionalValue` - The value of the property which could be null in the case of a getter
    `isGetter` - Whether the missing property event was the result of a getter or a setter
  Returns:
    The result of the propertyMissing method or throws MissingPropertyException

### invokeStaticMissingProperty

    protected Object invokeStaticMissingProperty(Object instance,
                                                 String propertyName,
                                                 Object optionalValue,
                                                 boolean isGetter)

  Hook to deal with the case of MissingProperty for static properties. The method will look attempt to look up "propertyMissing" handlers and invoke them otherwise thrown a MissingPropertyException

  Parameters:
    `instance` - The instance
    `propertyName` - The name of the property
    `optionalValue` - The value in the case of a setter
    `isGetter` - True if its a getter
  Returns:
    The value in the case of a getter or a MissingPropertyException

### invokeMethod

    public Object invokeMethod(Object object,
                               String methodName,
                               Object[] originalArguments)

  Invokes the given method on the object. TODO: should this be deprecated? If so, we have to propogate to many places.

  Specified by:
    `invokeMethod` in interface `MetaObjectProtocol`
  Parameters:
    `object` - The instance which the method is invoked on
    `methodName` - The name of the method
    `originalArguments` - The arguments to the method
  Returns:
    The return value of the method which is null if the return type is void
  See Also:
    `MissingMethodException`

### invokeMethod

    public Object invokeMethod(Class sender,
                               Object object,
                               String methodName,
                               Object[] originalArguments,
                               boolean isCallToSuper,
                               boolean fromInsideClass)

  Invokes the given method on the object.

  Specified by:
    `invokeMethod` in interface `MetaClass`
  Parameters:
    `sender` - The java.lang.Class instance that invoked the method
    `object` - The object which the method was invoked on
    `methodName` - The name of the method
    `originalArguments` - The arguments to the method
    `isCallToSuper` - Whether the method is a call to a super class method
    `fromInsideClass` - Whether the call was invoked from the inside or the outside of the class
  Returns:
    The return value of the method

### getMethodWithCaching

    public MetaMethod getMethodWithCaching(Class sender,
                                           String methodName,
                                           Object[] arguments,
                                           boolean isCallToSuper)

### retrieveConstructor

    public Constructor retrieveConstructor(Class[] argClasses)

### retrieveStaticMethod

    public MetaMethod retrieveStaticMethod(String methodName,
                                           Object[] arguments)

### getMethodWithoutCaching

    public MetaMethod getMethodWithoutCaching(Class sender,
                                              String methodName,
                                              Class[] arguments,
                                              boolean isCallToSuper)

### invokeStaticMethod

    public Object invokeStaticMethod(Object object,
                                     String methodName,
                                     Object[] arguments)

  Description copied from interface: `MetaObjectProtocol`

  Invokes a static method on the given Object with the given name and arguments.

  The Object can either be an instance of the class that this MetaObjectProtocol instance applies to or the java.lang.Class instance itself. If a method cannot be invoked a MissingMethodException is will be thrown

  Specified by:
    `invokeStaticMethod` in interface `MetaObjectProtocol`
  Parameters:
    `object` - An instance of the class returned by the getTheClass() method or the class itself
    `methodName` - The name of the method
    `arguments` - The arguments to the method
  Returns:
    The return value of the method which is null if the return type is void
  See Also:
    `MissingMethodException`

### invokeConstructorAt

    public Object invokeConstructorAt(Class at,
                                      Object[] arguments)

  Deprecated. use invokeConstructor instead

  Warning, this method will be removed

### invokeConstructor

    public Object invokeConstructor(Object[] arguments)

  Description copied from interface: `MetaObjectProtocol`
  Invokes a constructor for the given arguments. The MetaClass will attempt to pick the best argument which matches the types of the objects passed within the arguments array

  Specified by:
    `invokeConstructor` in interface `MetaObjectProtocol`
  Parameters:
    `arguments` - The arguments to the constructor
  Returns:
    An instance of the java.lang.Class that this MetaObjectProtocol object applies to

### selectConstructorAndTransformArguments

    public int selectConstructorAndTransformArguments(int numberOfCosntructors,
                                                      Object[] arguments)

  Description copied from interface: `MetaClass`
  Internal method to support Groovy runtime. Not for client usage.

  Specified by:
    `selectConstructorAndTransformArguments` in interface `MetaClass`
  Parameters:
    `numberOfCosntructors` - The number of constructors
    `arguments` - The arguments
  Returns:
    selected index

### checkInitalised

    protected void checkInitalised()

  checks if the initialisation of the class id complete. This method should be called as a form of assert, it is no way to test if there is still initialisation work to be done. Such logic must be implemented in a different way.

  Throws:
    `IllegalStateException` - if the initialisation is incomplete yet

### setProperties

    public void setProperties(Object bean,
                              Map map)

  Sets a number of bean properties from the given Map where the keys are the String names of properties and the values are the values of the properties to set

### getProperty

    public Object getProperty(Class sender,
                              Object object,
                              String name,
                              boolean useSuper,
                              boolean fromInsideClass)

  Description copied from interface: `MetaClass`

  Retrieves a property on the given receiver for the specified arguments. The sender is the class that is requesting the property from the object. The MetaClass will attempt to establish the method to invoke based on the name and arguments provided.

  The isCallToSuper and fromInsideClass help the Groovy runtime perform optimisations on the call to go directly to the super class if necessary

  Specified by:
    `getProperty` in interface `MetaClass`
  Parameters:
    `sender` - The java.lang.Class instance that requested the property
    `object` - The Object which the property is being retrieved from
    `name` - The name of the property
    `useSuper` - Whether the call is to a super class property
    `fromInsideClass` - ??
  Returns:
    the given property's value on the object

### getProperties

    public List getProperties()

  Get all the properties defined for this type

  Specified by:
    `getProperties` in interface `MetaClass`
  Specified by:
    `getProperties` in interface `MetaObjectProtocol`
  Returns:
    a list of MetaProperty objects
  See Also:
    `MetaProperty`

### addMetaBeanProperty

    public void addMetaBeanProperty(MetaBeanProperty mp)

  Adds a new MetaBeanProperty to this MetaClass

  Specified by:
    `addMetaBeanProperty` in interface `MutableMetaClass`
  Parameters:
    `mp` - The MetaBeanProperty

### setProperty

    public void setProperty(Class sender,
                            Object object,
                            String name,
                            Object newValue,
                            boolean useSuper,
                            boolean fromInsideClass)

  Sets the property value on an object

  Specified by:
    `setProperty` in interface `MetaClass`
  Parameters:
    `sender` - The java.lang.Class instance that is mutating the property
    `object` - The Object which the property is being set on
    `name` - The name of the property
    `newValue` - The new value of the property to set
    `useSuper` - Whether the call is to a super class property
    `fromInsideClass` - ??

### getAttribute

    public Object getAttribute(Class sender,
                               Object receiver,
                               String messageName,
                               boolean useSuper)

  Description copied from interface: `MetaClass`
  Retrieves the value of an attribute (field). This method is to support the Groovy runtime and not for general client API usage.

  Specified by:
    `getAttribute` in interface `MetaClass`
  Parameters:
    `sender` - The class of the object that requested the attribute
    `receiver` - The instance
    `messageName` - The name of the attribute
    `useSuper` - Whether to look-up on the super class or not
  Returns:
    The attribute value

### getAttribute

    public Object getAttribute(Class sender,
                               Object object,
                               String attribute,
                               boolean useSuper,
                               boolean fromInsideClass)

  Looks up the given attribute (field) on the given object

### setAttribute

    public void setAttribute(Class sender,
                             Object object,
                             String attribute,
                             Object newValue,
                             boolean useSuper,
                             boolean fromInsideClass)

  Sets the given attribute (field) on the given object

  Specified by:
    `setAttribute` in interface `MetaClass`
  Parameters:
    `sender` - The class of the object that requested the attribute
    `object` - The instance
    `attribute` - The name of the attribute
    `newValue` - The value of the attribute
    `useSuper` - Whether to look-up on the super class or not
    `fromInsideClass` - Whether the call happened from the inside or the outside of a class

### getClassNode

    public ClassNode getClassNode()

  Description copied from interface: `MetaClass`
  Obtains a reference to the original AST for the MetaClass if it is available at runtime

  Specified by:
    `getClassNode` in interface `MetaClass`
  Returns:
    The original AST or null if it cannot be returned

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### addMetaMethod

    public void addMetaMethod(MetaMethod method)

  adds a MetaMethod to this class. WARNING: this method will not do the neccessary steps for multimethod logic and using this method doesn't mean, that a method added here is replacing another method from a parent class completely. These steps are usually done by initalize, which means if you need these steps, you have to add the method before running initialize the first time.

  Specified by:
    `addMetaMethod` in interface `MutableMetaClass`
  Parameters:
    `method` - the MetaMethod
  See Also:
    `initialize()`

### isInitialized

    protected boolean isInitialized()

### initialize

    public void initialize()

  Description copied from interface: `MetaClass`
  complete the initlialisation process. After this method is called no methods should be added to the meta class. Invocation of methods or access to fields/proeprties is forbidden unless this method is called. This method should contain any initialisation code, taking a longer time to complete. An example is the creation of the Reflector. It is suggested to synchronize this method.

  Specified by:
    `initialize` in interface `MetaClass`

### getMethods

    public List getMethods()

  Description copied from interface: `MetaClass`
  Retrieves a list of MetaMethods held by the class

  Specified by:
    `getMethods` in interface `MetaClass`
  Specified by:
    `getMethods` in interface `MetaObjectProtocol`
  Returns:
    A list of MetaMethods
  See Also:
    `MetaMethod`

### getMetaMethods

    public List getMetaMethods()

  Description copied from interface: `MetaClass`
  Retrieves a list of MetaMethod instances held by this class

  Specified by:
    `getMetaMethods` in interface `MetaClass`
  Returns:
    A list of MetaMethod instances

### dropStaticMethodCache

    protected void dropStaticMethodCache(String name)

### dropMethodCache

    protected void dropMethodCache(String name)

### getProperty

    public Object getProperty(Object object,
                              String property)

  Description copied from interface: `MetaObjectProtocol`

  Retrieves a property of an instance of the class returned by the getTheClass() method.

  What this means is largely down to the MetaClass implementation, however the default case would result in an attempt to invoke a JavaBean getter, or if no such getter exists a public field of the instance.

  Specified by:
    `getProperty` in interface `MetaObjectProtocol`
  Parameters:
    `object` - An instance of the class returned by the getTheClass() method
    `property` - The name of the property to retrieve the value for
  Returns:
    The properties value
  See Also:
    `MetaClassImpl`

### setProperty

    public void setProperty(Object object,
                            String property,
                            Object newValue)

  Description copied from interface: `MetaObjectProtocol`

  Sets a property of an instance of the class returned by the getTheClass() method.

  What this means is largely down to the MetaClass implementation, however the default case would result in an attempt to invoke a JavaBean setter, or if no such setter exists to set a public field of the instance.

  Specified by:
    `setProperty` in interface `MetaObjectProtocol`
  Parameters:
    `object` - An instance of the class returned by the getTheClass() method
    `property` - The name of the property to set
    `newValue` - The new value of the property
  See Also:
    `MetaClassImpl`

### getAttribute

    public Object getAttribute(Object object,
                               String attribute)

  Description copied from interface: `MetaObjectProtocol`

  Retrieves an attribute of an instance of the class returned by the getTheClass() method.

  What this means is largely down to the MetaClass implementation, however the default case would result in attempt to read a field of the instance.

  Specified by:
    `getAttribute` in interface `MetaObjectProtocol`
  Parameters:
    `object` - An instance of the class returned by the getTheClass() method
    `attribute` - The name of the attribute to retrieve the value for
  Returns:
    The attribute value
  See Also:
    `MetaClassImpl`

### setAttribute

    public void setAttribute(Object object,
                             String attribute,
                             Object newValue)

  Description copied from interface: `MetaObjectProtocol`

  Sets an attribute of an instance of the class returned by the getTheClass() method.

  What this means is largely down to the MetaClass implementation, however the default case would result in an attempt to set a field of the instance.

  Specified by:
    `setAttribute` in interface `MetaObjectProtocol`
  Parameters:
    `object` - An instance of the class returned by the getTheClass() method
    `attribute` - The name of the attribute to set
    `newValue` - The new value of the attribute
  See Also:
    `MetaClassImpl`

### pickMethod

    public MetaMethod pickMethod(String methodName,
                                 Class[] arguments)

  Description copied from interface: `MetaClass`
  Selects a method by name and argument classes. This method does not search for an exact match, it searches for a compatible method. For this the method selection mechanism is used as provided bye the implementation of this MetaClass. pickMethod may or may not used during the method selection process when invoking a method thereis no warranty for that.

  Specified by:
    `pickMethod` in interface `MetaClass`
  Parameters:
    `methodName` - the name of the method to pick
    `arguments` - the method arguments
  Returns:
    a matching MetaMethod or null

### retrieveMethod

    protected MetaMethod retrieveMethod(String methodName,
                                        Class[] arguments)

  Deprecated. use pickMethod instead

### clearInvocationCaches

    protected void clearInvocationCaches()

  remove all method call cache entries. This should be done if a method is added during runtime, but not by using a category.

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