Package org.codehaus.groovy.runtime.metaclass

Class ClosureMetaClass

java.lang.Object

groovy.lang.MetaClassImpl

org.codehaus.groovy.runtime.metaclass.ClosureMetaClass

All Implemented Interfaces:

MetaClass, MetaObjectProtocol, MutableMetaClass

public final class ClosureMetaClass
extends MetaClassImpl

A metaclass for closures generated by the Groovy compiler. These classes have special characteristics this MetaClass uses. One of these is that a generated Closure has only additional doCall methods, all other methods are in the Closure class as well. To use this fact this MetaClass uses a MetaClass for Closure as static field And delegates calls to this MetaClass if needed. This allows a lean implementation for this MetaClass. Multiple generated closures will then use the same MetaClass for Closure. For static dispatching this class uses the MetaClass of Class, again all instances of this class will share that MetaClass. The Class MetaClass is initialized lazy, because most operations do not need this MetaClass.

The Closure and Class MetaClasses are not replaceable.

This MetaClass is for internal usage only!

Since:

1.5

Nested Class Summary

Nested classes/interfaces inherited from class groovy.lang.MetaClassImpl

MetaClassImpl.MetaConstructor

Field Summary

Fields inherited from class groovy.lang.MetaClassImpl

getPropertyMethod, INVOKE_METHOD_METHOD, invokeMethodMethod, isGroovyObject, isMap, metaMethodIndex, METHOD_MISSING, PROPERTY_MISSING, registry, setPropertyMethod, STATIC_METHOD_MISSING, STATIC_PROPERTY_MISSING, theCachedClass, theClass

Constructor Summary

Constructors

Constructor	Description
ClosureMetaClass(MetaClassRegistry registry, Class theClass)

Method Summary

Modifier and Type	Method	Description
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 an instance method to this metaclass.
void	addNewStaticMethod(Method method)	Adds a static method to this metaclass.
protected void	applyPropertyDescriptors(PropertyDescriptor[] propertyDescriptors)
CallSite	createPogoCallCurrentSite(CallSite site, Class sender, Object[] args)	Create a CallSite
CallSite	createPogoCallSite(CallSite site, Object[] args)	Create a CallSite
CallSite	createPojoCallSite(CallSite site, Object receiver, Object[] args)	Create a CallSite
Object	getAttribute(Class sender, Object object, String attribute, boolean useSuper, boolean fromInsideClass)	Retrieves the value of an attribute (field).
List<MetaMethod>	getMetaMethods()	Retrieves the list of MetaMethods held by this class.
MetaProperty	getMetaProperty(String name)	Returns a MetaProperty for the given name or null if it doesn't exist
List<MetaMethod>	getMethods()	Retrieves the list of MetaMethods held by the class.
MetaMethod	getMethodWithoutCaching(int index, Class sender, String methodName, Class[] arguments, boolean isCallToSuper)
List<MetaProperty>	getProperties()	Returns the available properties 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.
MetaMethod	getStaticMetaMethod(String name, Class[] argTypes)
MetaMethod	getStaticMetaMethod(String name, Object[] args)	Retrieves a static MetaMethod for the given name and argument values, using the types of the arguments to establish the chosen MetaMethod
void	initialize()	Complete the initialisation process.
Object	invokeMethod(Class sender, Object object, String methodName, Object[] arguments, boolean isCallToSuper, boolean fromInsideClass)	Invokes a method on the given receiver for the specified arguments.
Object	invokeStaticMethod(Object object, String methodName, Object[] arguments)	Invokes a static method on the given Object with the given name and arguments.
protected boolean	isInitialized()
MetaMethod	pickMethod(String methodName, Class[] argumentTypes)	Selects a method by name and argument classes.
static void	resetCachedMetaClasses()
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[] arguments)
MetaMethod	retrieveStaticMethod(String methodName, Class[] arguments)
void	setAttribute(Class sender, Object object, String attribute, Object newValue, boolean useSuper, boolean fromInsideClass)	Sets an attribute on the given receiver for the specified arguments.
protected void	setInitialized(boolean initialized)
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)	Writes a property on the given receiver for the specified arguments.

Methods inherited from class groovy.lang.MetaClassImpl

addMetaMethodToIndex, checkIfGroovyObjectMethod, checkInitalised, chooseMethod, clearInvocationCaches, createConstructorSite, createErrorMessageForAmbiguity, createStaticSite, createTransformMetaMethod, doChooseMostSpecificParams, dropMethodCache, dropStaticMethodCache, findMethodInClassHierarchy, findMixinMethod, findOwnMethod, findPropertyInClassHierarchy, getAdditionalMetaMethods, getAttribute, getAttribute, getClassInfo, getClassNode, getEffectiveGetMetaProperty, getMetaMethod, getMethodWithCaching, getMethodWithoutCaching, getProperty, getRegistry, getSubclassMetaMethods, getSuperClasses, getTheCachedClass, getTheClass, getVersion, handleMatches, hasCustomInvokeMethod, hasCustomStaticInvokeMethod, hasProperty, incVersion, invokeConstructor, invokeMethod, invokeMethod, invokeMissingMethod, invokeMissingProperty, invokeStaticMissingProperty, isGroovyObject, isModified, isPermissivePropertyAccess, onGetPropertyFoundInHierarchy, onInvokeMethodFoundInHierarchy, onMixinMethodFound, onSetPropertyFoundInHierarchy, onSuperMethodFoundInHierarchy, onSuperPropertyFoundInHierarchy, reinitialize, retrieveConstructor, retrieveStaticMethod, selectConstructorAndTransformArguments, setAttribute, setPermissivePropertyAccess, setProperty, toString

Methods inherited from class java.lang.Object

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

Constructor Details

ClosureMetaClass

public ClosureMetaClass(MetaClassRegistry registry,
 Class theClass)

Method Details

resetCachedMetaClasses

public static void resetCachedMetaClasses()

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

Overrides:

getMetaProperty in class MetaClassImpl

Parameters:

name - The name of the MetaProperty

Returns:

A MetaProperty or null

See Also:

• MetaObjectProtocol.getMetaProperty(String)

invokeMethod

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

Description copied from class: MetaClassImpl

Invokes a method on the given receiver for the specified arguments. The sender is the class that invoked the method on 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:

invokeMethod in interface MetaClass

Overrides:

invokeMethod in class MetaClassImpl

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

arguments - 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.

See Also:

• MetaClass.invokeMethod(Class, Object, String, Object[], boolean, boolean)

initialize

public void initialize()

Description copied from class: MetaClassImpl

Complete the initialisation process. After this method is called no methods should be added to the metaclass. Invocation of methods or access to fields/properties 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

Overrides:

initialize in class MetaClassImpl

getMethods

public List<MetaMethod> getMethods()

Description copied from class: MetaClassImpl

Retrieves the list of MetaMethods held by the class. This list does not include MetaMethods added by groovy.lang.ExpandoMetaClass.

Specified by:

getMethods in interface MetaClass

Specified by:

getMethods in interface MetaObjectProtocol

Overrides:

getMethods in class MetaClassImpl

Returns:

A list of MetaMethods

See Also:

• MetaMethod

getMetaMethods

public List<MetaMethod> getMetaMethods()

Description copied from class: MetaClassImpl

Retrieves the list of MetaMethods held by this class. This list includes MetaMethods added by groovy.lang.ExpandoMetaClass.

Specified by:

getMetaMethods in interface MetaClass

Overrides:

getMetaMethods in class MetaClassImpl

Returns:

A list of MetaMethods

getProperties

public List<MetaProperty> getProperties()

Description copied from class: MetaClassImpl

Returns the available properties for this type.

Specified by:

getProperties in interface MetaClass

Specified by:

getProperties in interface MetaObjectProtocol

Overrides:

getProperties in class MetaClassImpl

Returns:

a list of MetaProperty objects

See Also:

• MetaProperty

pickMethod

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

Description copied from class: MetaClassImpl

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 by the implementation of this MetaClass. pickMethod may or may not be used during the method selection process when invoking a method. There is no warranty for that.

Specified by:

pickMethod in interface MetaClass

Overrides:

pickMethod in class MetaClassImpl

Parameters:

methodName - the name of the method to pick

argumentTypes - the method arguments

Returns:

a matching MetaMethod or null

retrieveStaticMethod

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

isInitialized

protected boolean isInitialized()

Overrides:

isInitialized in class MetaClassImpl

setInitialized

protected void setInitialized(boolean initialized)

Overrides:

setInitialized in class MetaClassImpl

getStaticMetaMethod

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

Description copied from interface: MetaObjectProtocol

Retrieves 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

Overrides:

getStaticMetaMethod in class MetaClassImpl

Parameters:

name - The name of the MetaMethod

args - The argument types

Returns:

A MetaMethod or null if it doesn't exist

See Also:

• MetaObjectProtocol.getStaticMetaMethod(String, Object[])

getStaticMetaMethod

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

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

Overrides:

getProperty in class MetaClassImpl

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

getAttribute

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

Description copied from class: MetaClassImpl

Retrieves the value of an attribute (field). This method is to support the Groovy runtime and not for general client API usage.

Overrides:

getAttribute in class MetaClassImpl

Parameters:

sender - The class of the object that requested the attribute

object - The instance the attribute is to be retrieved from

attribute - The name of the attribute

useSuper - Whether to look-up on the super class or not

fromInsideClass - Whether the call was invoked from the inside or the outside of the class.

Returns:

The attribute value

setAttribute

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

Description copied from class: MetaClassImpl

Sets an attribute on the given receiver for the specified arguments. The sender is the class that is setting the attribute 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:

setAttribute in interface MetaClass

Overrides:

setAttribute in class MetaClassImpl

Parameters:

sender - The java.lang.Class instance that is mutating the property

object - The Object which the property is being set on

attribute - The name of the attribute,

newValue - The new value of the attribute to set

useSuper - Whether the call is to a super class property

fromInsideClass - Whether the call was invoked from the inside or the outside of the class

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

Overrides:

invokeStaticMethod in class MetaClassImpl

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

setProperty

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

Description copied from class: MetaClassImpl

Writes 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 useSuper and fromInsideClass help the runtime perform optimisations on the call to go directly to the super class if necessary

Specified by:

setProperty in interface MetaClass

Overrides:

setProperty in class MetaClassImpl

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 - Whether the call was invoked from the inside or the outside of the class.

getMethodWithoutCaching

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

setProperties

public void setProperties(Object bean,
 Map map)

Description copied from class: MetaClassImpl

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

Overrides:

setProperties in class MetaClassImpl

addMetaBeanProperty

public void addMetaBeanProperty(MetaBeanProperty mp)

Description copied from class: MetaClassImpl

Adds a new MetaBeanProperty to this MetaClass

Specified by:

addMetaBeanProperty in interface MutableMetaClass

Overrides:

addMetaBeanProperty in class MetaClassImpl

Parameters:

mp - The MetaBeanProperty

addMetaMethod

public void addMetaMethod(MetaMethod method)

Description copied from class: MetaClassImpl

adds a MetaMethod to this class. WARNING: this method will not do the necessary 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 initialize, 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

Overrides:

addMetaMethod in class MetaClassImpl

Parameters:

method - the MetaMethod

See Also:

• MetaClassImpl.initialize()

addNewInstanceMethod

public void addNewInstanceMethod(Method method)

Description copied from class: MetaClassImpl

Adds an instance method to this metaclass.

Specified by:

addNewInstanceMethod in interface MutableMetaClass

Overrides:

addNewInstanceMethod in class MetaClassImpl

Parameters:

method - The method to be added

addNewStaticMethod

public void addNewStaticMethod(Method method)

Description copied from class: MetaClassImpl

Adds a static method to this metaclass.

Specified by:

addNewStaticMethod in interface MutableMetaClass

Overrides:

addNewStaticMethod in class MetaClassImpl

Parameters:

method - The method to be added

retrieveConstructor

public Constructor retrieveConstructor(Class[] arguments)

Overrides:

retrieveConstructor in class MetaClassImpl

createPojoCallSite

public CallSite createPojoCallSite(CallSite site,
 Object receiver,
 Object[] args)

Description copied from class: MetaClassImpl

Create a CallSite

Overrides:

createPojoCallSite in class MetaClassImpl

createPogoCallSite

public CallSite createPogoCallSite(CallSite site,
 Object[] args)

Description copied from class: MetaClassImpl

Create a CallSite

Overrides:

createPogoCallSite in class MetaClassImpl

createPogoCallCurrentSite

public CallSite createPogoCallCurrentSite(CallSite site,
 Class sender,
 Object[] args)

Description copied from class: MetaClassImpl

Create a CallSite

Overrides:

createPogoCallCurrentSite in class MetaClassImpl

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

Overrides:

respondsTo in class MetaClassImpl

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

Overrides:

respondsTo in class MetaClassImpl

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)

applyPropertyDescriptors

protected void applyPropertyDescriptors(PropertyDescriptor[] propertyDescriptors)

Overrides:

applyPropertyDescriptors in class MetaClassImpl