org.onemind.commons.java.datastructure
Class NametableStack.LocalNametable

java.lang.Object
  org.onemind.commons.java.datastructure.NametableStack.LocalNametable

All Implemented Interfaces:

Nametable

Enclosing class:

NametableStack

private static class NametableStack.LocalNametable
extends java.lang.Object
implements Nametable

The local nametable defines a scope where local variables mask out the global variables, but the global variable can still be accessed. This is useful for implementing function context

Author:

TiongHiang Lee (thlee@onemindsoft.org)

Field Summary

private Nametable	_global the global map
private java.util.Map	_locals the local variables
private int	_scope the scope

Constructor Summary

private

NametableStack.LocalNametable(Nametable global, int scope) Constructor

Method Summary

java.lang.Object	access(java.lang.String name) Access the value associated with name
java.util.Map	asMap() Return map representation of this nametable
java.lang.Object	assign(java.lang.String name, java.lang.Object value) Assign a variable in the name table
boolean	containsName(java.lang.String key) Whether the nametable contains the name
void	declare(java.lang.String name, java.lang.Object value) Declare a variable in the name table
private Nametable	getGlobal() Get the global
java.lang.String	toString()
void	undeclare(java.lang.String name) Undeclare the name

Methods inherited from class java.lang.Object

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

Field Detail

_locals

private final java.util.Map _locals

the local variables

_global

private final Nametable _global

the global map

_scope

private final int _scope

the scope

Constructor Detail

NametableStack.LocalNametable

private NametableStack.LocalNametable(Nametable global,
                                      int scope)

Constructor

Parameters:

global - the global

scope - the scope # where this local nametabe is openned

Method Detail

getGlobal

private Nametable getGlobal()

Get the global

Returns:

the global

containsName

public boolean containsName(java.lang.String key)

Whether the nametable contains the name

Specified by:

containsName in interface Nametable

Parameters:

key - the name

Returns:

true if contains the name

declare

public void declare(java.lang.String name,
                    java.lang.Object value)

Declare a variable in the name table

Specified by:

declare in interface Nametable

Parameters:

name - the name

value - the value

assign

public java.lang.Object assign(java.lang.String name,
                               java.lang.Object value)

Assign a variable in the name table

Specified by:

assign in interface Nametable

Parameters:

name - the name

value - the value

Returns:

the old value, or null

access

public java.lang.Object access(java.lang.String name)

Access the value associated with name

Specified by:

access in interface Nametable

Returns:

undeclare

public void undeclare(java.lang.String name)

Undeclare the name

Specified by:

undeclare in interface Nametable

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

asMap

public java.util.Map asMap()

Description copied from interface: Nametable

Return map representation of this nametable

Specified by:

asMap in interface Nametable

Returns:

unmodifiable map representation of this nametable