Package gnu.mapping

Class IndirectableLocation<T>

java.lang.Object

gnu.mapping.Location<T>

gnu.mapping.IndirectableLocation<T>

Direct Known Subclasses:

NamedLocation

public abstract class IndirectableLocation<T>
extends Location<T>

Field Summary

Fields

Modifier and Type	Field	Description
protected Location<T>	base	If non-null, operations are forwarded to the base location.
protected static Object	DIRECT_ON_SET	If value==DIRECT_ON_SET, break indirection on a set.
protected static Object	INDIRECT_FLUIDS	If value has this value, force indirection even for the setWithSave operation.
protected Object	value	If base is null, the current value stored in this Location.

Fields inherited from class gnu.mapping.Location

UNBOUND

Constructor Summary

Constructors

Constructor	Description
IndirectableLocation()

Method Summary

Modifier and Type	Method	Description
Location	getBase()
Location	getBaseForce()
Environment	getEnvironment()
Object	getKeyProperty()
Symbol	getKeySymbol()
boolean	isConstant()
void	setAlias(Location base)	Define this Location as an alias for some other Location.
void	setBase(Location base)
void	undefine()

Methods inherited from class gnu.mapping.Location

define, entered, get, get, getValue, isBound, make, make, make, print, set, setRestore, setValue, setWithSave, toString

Methods inherited from class java.lang.Object

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

Field Detail

DIRECT_ON_SET

protected static final Object DIRECT_ON_SET

If value==DIRECT_ON_SET, break indirection on a set.

INDIRECT_FLUIDS

protected static final Object INDIRECT_FLUIDS

If value has this value, force indirection even for the setWithSave operation. Ignoring the restore aspect of a fluid-let, it is normally treated as closer to a define than to a set, in that we break the sharing with another Environment. Setting value to INDIRECT_FLUIDS means we do not want to break the indirection in this case.

base

protected Location<T> base

If non-null, operations are forwarded to the base location.

value

protected Object value

If base is null, the current value stored in this Location. If base is non-null, then value is generally ignored. However, the special value DIRECT_ON_SET means that writes change value directly, instead of setting the value of base.

Constructor Detail

IndirectableLocation

public IndirectableLocation()

Method Detail

getKeySymbol

public Symbol getKeySymbol()

Overrides:

getKeySymbol in class Location<T>

getKeyProperty

public Object getKeyProperty()

Overrides:

getKeyProperty in class Location<T>

isConstant

public boolean isConstant()

Overrides:

isConstant in class Location<T>

getBase

public Location getBase()

Overrides:

getBase in class Location<T>

getBaseForce

public Location getBaseForce()

setBase

public void setBase(Location base)

setAlias

public void setAlias(Location base)

Define this Location as an alias for some other Location.

undefine

public void undefine()

Overrides:

undefine in class Location<T>

getEnvironment

public Environment getEnvironment()