org.mozilla.javascript

Class Delegator

public class Delegator extends Object implements Function

This is a helper class for implementing wrappers around Scriptable objects. It implements the Function interface and delegates all invocations to a delegee Scriptable object. The normal use of this class involves creating a sub-class and overriding one or more of the methods. A useful application is the implementation of interceptors, pre/post conditions, debugging.

Author: Matthias Radestock

See Also: Function Scriptable

Field Summary
protected Scriptable	obj

Constructor Summary
	Delegator() Create a Delegator prototype.
	Delegator(Scriptable obj) Create a new Delegator that forwards requests to a delegee Scriptable object.

Method Summary
Object	call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args)
Scriptable	construct(Context cx, Scriptable scope, Object[] args) Note that if the `delegee` is `null`, this method creates a new instance of the Delegator itself rathert than forwarding the call to the `delegee`.
void	delete(String name)
void	delete(int index)
Object	get(String name, Scriptable start)
Object	get(int index, Scriptable start)
String	getClassName()
Object	getDefaultValue(Class hint) Note that this method does not get forwarded to the delegee if the `hint` parameter is null, `ScriptRuntime.ScriptableClass` or `ScriptRuntime.FunctionClass`.
Scriptable	getDelegee() Retrieve the delegee.
Object[]	getIds()
Scriptable	getParentScope()
Scriptable	getPrototype()
boolean	has(String name, Scriptable start)
boolean	has(int index, Scriptable start)
boolean	hasInstance(Scriptable instance)
protected Delegator	newInstance() Crete new Delegator instance.
void	put(String name, Scriptable start, Object value)
void	put(int index, Scriptable start, Object value)
void	setDelegee(Scriptable obj) Set the delegee.
void	setParentScope(Scriptable parent)
void	setPrototype(Scriptable prototype)

Field Detail

obj

protected Scriptable obj

Constructor Detail

Delegator

public Delegator()

Create a Delegator prototype. This constructor should only be used for creating prototype objects of Delegator.

Delegator

public Delegator(Scriptable obj)

Create a new Delegator that forwards requests to a delegee Scriptable object.

Parameters: obj the delegee

See Also: Scriptable

Method Detail

call

public Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args)

construct

public Scriptable construct(Context cx, Scriptable scope, Object[] args)

Note that if the delegee is null, this method creates a new instance of the Delegator itself rathert than forwarding the call to the delegee. This permits the use of Delegator prototypes.

Parameters: cx the current Context for this thread scope an enclosing scope of the caller except when the function is called from a closure. args the array of arguments

Returns: the allocated object

Parameters: hint the type hint

Returns: the default value

See Also: Scriptable

getDelegee

public Scriptable getDelegee()

Retrieve the delegee.

Returns: the delegee

Parameters: obj the delegee

See Also: Scriptable

setParentScope

public void setParentScope(Scriptable parent)

See Also: Scriptable

setPrototype

public void setPrototype(Scriptable prototype)

See Also: Scriptable