gnu.mapping
Class ConstrainedLocation

java.lang.Object
  gnu.mapping.Location
      gnu.mapping.ConstrainedLocation

Direct Known Subclasses:

ReadOnlyLocation

public class ConstrainedLocation
extends Location

Field Summary

protected Location	base
protected Procedure	converter

Fields inherited from class gnu.mapping.Location

UNBOUND

Constructor Summary

ConstrainedLocation()

Method Summary

protected java.lang.Object	coerce(java.lang.Object newValue)
java.lang.Object	get(java.lang.Object defaultValue)
java.lang.Object	getKeyProperty()
Symbol	getKeySymbol()
boolean	isBound()
boolean	isConstant()
static ConstrainedLocation	make(Location base, Procedure converter)
void	set(java.lang.Object newValue)
void	setRestore(java.lang.Object oldValue, CallContext ctx) Restore an old value.
java.lang.Object	setWithSave(java.lang.Object newValue, CallContext ctx) Set a value, but return cookie so old value can be restored.

Methods inherited from class gnu.mapping.Location

entered, get, getBase, getValue, make, make, make, print, setValue, toString, undefine

Methods inherited from class java.lang.Object

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

Field Detail

base

protected Location base

converter

protected Procedure converter

Constructor Detail

ConstrainedLocation

public ConstrainedLocation()

Method Detail

make

public static ConstrainedLocation make(Location base,
                                       Procedure converter)

getKeySymbol

public Symbol getKeySymbol()

Overrides:

getKeySymbol in class Location

getKeyProperty

public java.lang.Object getKeyProperty()

Overrides:

getKeyProperty in class Location

isConstant

public boolean isConstant()

Overrides:

isConstant in class Location

get

public final java.lang.Object get(java.lang.Object defaultValue)

Specified by:

get in class Location

isBound

public boolean isBound()

Overrides:

isBound in class Location

coerce

protected java.lang.Object coerce(java.lang.Object newValue)

set

public final void set(java.lang.Object newValue)

Specified by:

set in class Location

setWithSave

public java.lang.Object setWithSave(java.lang.Object newValue,
                                    CallContext ctx)

Description copied from class: Location

Set a value, but return cookie so old value can be restored. This is intended for fluid-let where (in the case of multiple threads) a simple save-restore isn't always the right thing.

Overrides:

setWithSave in class Location

setRestore

public void setRestore(java.lang.Object oldValue,
                       CallContext ctx)

Description copied from class: Location

Restore an old value.

Overrides:

setRestore in class Location

Parameters:

oldValue - the return value from a prior setWithSave.