edu.vub.at.objects.natives
Class NATField

java.lang.Object
  edu.vub.at.objects.natives.NATNil
      edu.vub.at.objects.natives.NATByRef
          edu.vub.at.objects.natives.NATField

All Implemented Interfaces:

ATAbstractGrammar, ATConversions, ATExpression, ATField, ATNil, ATObject, ATStatement, java.io.Serializable

public class NATField

extends NATByRef

implements ATField

NATField implements a causally connected field of an object. Rather than storing these fields directly in every object, we choose to only make people pay when they choose to reify them.

Author:

smostinc

See Also:

Serialized Form

Field Summary

private NATCallframe	frame_
private ATSymbol	name_

Fields inherited from class edu.vub.at.objects.natives.NATNil

_INSTANCE_

Constructor Summary

NATField(ATSymbol name, NATCallframe frame)

Method Summary

ATField	base_asField()
ATSymbol	base_getName()
ATObject	base_readField()
ATNil	base_writeField(ATObject newValue) Sets the value of the field if possible
boolean	isNativeField()
ATTable	meta_getStripes() Returns the stripes of this object.
ATObject	meta_newInstance(ATTable initargs) Fields can be re-initialized when installed in an object that is being cloned.
NATText	meta_print() Prints out the object in a human-readable way.

Methods inherited from class edu.vub.at.objects.natives.NATByRef

meta_pass, meta_resolve

Methods inherited from class edu.vub.at.objects.natives.NATNil

asAmbientTalkObject, asJavaClassUnderSymbiosis, asJavaObjectUnderSymbiosis, asNativeBoolean, asNativeException, asNativeFarReference, asNativeFraction, asNativeNumber, asNativeNumeric, asNativeTable, asNativeText, base__opeql__opeql_, base_asActorMirror, base_asAsyncMessage, base_asBegin, base_asBoolean, base_asClosure, base_asDefinition, base_asExpression, base_asFarReference, base_asHandler, base_asMessage, base_asMessageCreation, base_asMethod, base_asMirror, base_asNumber, base_asSplice, base_asStatement, base_asStripe, base_asSymbol, base_asTable, base_asUnquoteSplice, base_asVariableAssignment, base_init, base_isBoolean, base_isCallFrame, base_isClosure, base_isFarReference, base_isMessageCreation, base_isMethod, base_isMirror, base_isSplice, base_isStripe, base_isSymbol, base_isTable, base_isUnquoteSplice, base_isVariableAssignment, base_new, createChild, equals, isAmbientTalkObject, isJavaObjectUnderSymbiosis, isNativeBoolean, isNativeText, meta_addField, meta_addMethod, meta_assignField, meta_assignVariable, meta_clone, meta_defineField, meta_doesNotUnderstand, meta_eval, meta_extend, meta_getDynamicParent, meta_getLexicalParent, meta_grabField, meta_grabMethod, meta_invoke, meta_isCloneOf, meta_isRelatedTo, meta_isStripedWith, meta_listFields, meta_listMethods, meta_lookup, meta_quote, meta_receive, meta_respondsTo, meta_select, meta_send, meta_share, readResolve, toString, writeReplace

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.vub.at.objects.ATObject

base__opeql__opeql_, base_init, base_new, meta_addField, meta_addMethod, meta_assignField, meta_assignVariable, meta_clone, meta_defineField, meta_doesNotUnderstand, meta_eval, meta_extend, meta_getDynamicParent, meta_getLexicalParent, meta_grabField, meta_grabMethod, meta_invoke, meta_isCloneOf, meta_isRelatedTo, meta_isStripedWith, meta_listFields, meta_listMethods, meta_lookup, meta_pass, meta_quote, meta_receive, meta_resolve, meta_respondsTo, meta_select, meta_send, meta_share

Methods inherited from interface edu.vub.at.objects.coercion.ATConversions

asAmbientTalkObject, asJavaClassUnderSymbiosis, asJavaObjectUnderSymbiosis, asNativeBoolean, asNativeException, asNativeFarReference, asNativeFraction, asNativeNumber, asNativeNumeric, asNativeTable, asNativeText, base_asActorMirror, base_asAsyncMessage, base_asBegin, base_asBoolean, base_asClosure, base_asDefinition, base_asExpression, base_asFarReference, base_asHandler, base_asMessage, base_asMessageCreation, base_asMethod, base_asMirror, base_asNumber, base_asSplice, base_asStatement, base_asStripe, base_asSymbol, base_asTable, base_asUnquoteSplice, base_asVariableAssignment, base_isBoolean, base_isCallFrame, base_isClosure, base_isFarReference, base_isMessageCreation, base_isMethod, base_isMirror, base_isSplice, base_isStripe, base_isSymbol, base_isTable, base_isUnquoteSplice, base_isVariableAssignment, isAmbientTalkObject, isJavaObjectUnderSymbiosis, isNativeBoolean, isNativeText

Field Detail

name_

private final ATSymbol name_

frame_

private final NATCallframe frame_

Constructor Detail

NATField

public NATField(ATSymbol name,
                NATCallframe frame)

Method Detail

base_getName

public ATSymbol base_getName()

Specified by:

base_getName in interface ATField

Returns:

a string by which the slot can be identified.

base_readField

public ATObject base_readField()
                        throws InterpreterException

Specified by:

base_readField in interface ATField

Returns:

the current value of the field.

Throws:

InterpreterException

base_writeField

public ATNil base_writeField(ATObject newValue)
                      throws InterpreterException

Description copied from interface: ATField

Sets the value of the field if possible

Specified by:

base_writeField in interface ATField

Parameters:

newValue - - the value the field should hold.

Returns:

- the return value is ignored.

Throws:

InterpreterException - - if the field cannot be modified.

meta_print

public NATText meta_print()
                   throws InterpreterException

Description copied from interface: ATObject

Prints out the object in a human-readable way.

Specified by:

meta_print in interface ATObject

Overrides:

meta_print in class NATNil

Throws:

InterpreterException

isNativeField

public boolean isNativeField()

Specified by:

isNativeField in interface ATConversions

Overrides:

isNativeField in class NATNil

base_asField

public ATField base_asField()
                     throws XTypeMismatch

Specified by:

base_asField in interface ATConversions

Overrides:

base_asField in class NATNil

Throws:

XTypeMismatch

meta_newInstance

public ATObject meta_newInstance(ATTable initargs)
                          throws InterpreterException

Fields can be re-initialized when installed in an object that is being cloned. They expect the new owner of the field as the sole instance to their 'new' method

Specified by:

meta_newInstance in interface ATObject

Overrides:

meta_newInstance in class NATNil

Throws:

InterpreterException

meta_getStripes

public ATTable meta_getStripes()
                        throws InterpreterException

Description copied from interface: ATObject

Returns the stripes of this object. Note that only the stripes that were attached directly to this object are returned, not all of the parent's stripes as well.

Specified by:

meta_getStripes in interface ATObject

Overrides:

meta_getStripes in class NATNil

Throws:

InterpreterException