sisc.modules.s2j
Class JavaNull

java.lang.Object
  sisc.util.Util
      sisc.data.Expression
          sisc.data.Value
              sisc.modules.s2j.JavaObject
                  sisc.modules.s2j.JavaNull

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Immediate, ExpressionVisitee, Version

public class JavaNull
extends JavaObject

See Also:

Serialized Form

Field Summary

Fields inherited from class sisc.modules.s2j.JavaObject

JARRAY, JCLASS, JCONSTR, JFIELD, JMETHOD, JNULL, JOBJ, JUNKN, obj, objType

Fields inherited from class sisc.data.Expression

annotations, EMPTYSET

Fields inherited from class sisc.util.Util

BACKQUOTE, BEGIN, bundles, caseSensitive, EMPTYLIST, EMPTYVEC, EOF, ERRORK, EVAL, EXPSC, EXPTOP, FALSE, FCONT, FIVE, JEXCEPTION, LAMBDA, LOCATION, maxFloatPrecision, MESSAGE, minFloatPrecision, NAME, OTHER, PARENT, permitInterrupts, QUOTE, QUOTESYM, REPORT, SETBANG, SISC, SISC_SPECIFIC, SISCB, SOURCE_COLUMN, SOURCE_FILE, SOURCE_LINE, SYMENV, THIS, TOPLEVEL, TRUE, UNQUOTE, UNQUOTE_SPLICING, VOID, ZV

Fields inherited from interface sisc.util.Version

VERSION

Constructor Summary

JavaNull()

JavaNull(java.lang.Class c)

Method Summary

java.lang.Class	classOf()
void	deserialize(Deserializer s) All Expressions must implement a default (no-argument) constructor.
void	display(ValueWriter w)
boolean	eqv(java.lang.Object v) Compares this Value to another for equality according to the rules of Scheme's eqv?.
java.lang.Object	get()
byte	getObjType()
void	serialize(Serializer s) All Expressions must implement a default (no-argument) constructor.
boolean	valueEqual(Value v) Compares this value to another for semantic equality.

Methods inherited from class sisc.modules.s2j.JavaObject

hashCode, visit

Methods inherited from class sisc.data.Value

apply, displayNamedOpaque, equals, eval, express, getValue, synopsis, synopsis, toString, valueHashCode, write, writeReplace

Methods inherited from class sisc.data.Expression

deserializeAnnotations, getAnnotation, getAnnotation, getAnnotationKeys, getAnnotations, getName, readExternal, readResolve, serializeAnnotations, setAnnotation, setAnnotation, setName, visitAnnotations, writeExternal

Methods inherited from class sisc.util.Util

annotated, annotatedAppEval, append, argCheck, argsToSymbols, assq, bininport, bininstream, binoutport, binoutstream, box, character, charinport, charinreader, charoutport, charoutwriter, charsetFromString, chr, cont, currentClassLoader, env, error, error, error, error, error, error, error, expr, getDefaultCharacterSet, immutablePair, immutableVector, inport, javaExceptionToString, javaWrap, justify, length, liMessage, liMessage, liMessage, liMessage, liMessage, liMessage, liMessage, list, list, list, list, list, makeURL, mapcar, memq, nlib, num, outport, pair, pairToExpressions, pairToExpVect, pairToValues, proc, read, registerBundle, reverse, reverseInPlace, simpleErrorToString, sourceAnnotations, str, string, sym, symbol, symval, truePair, truth, truth, typeError, typeError, updateName, url, url, url, valArrayToList, valArrayToList, valArrayToVec, vec, warn, warn, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaNull

public JavaNull()

JavaNull

public JavaNull(java.lang.Class c)

Method Detail

getObjType

public byte getObjType()

Overrides:

getObjType in class JavaObject

serialize

public void serialize(Serializer s)
               throws java.io.IOException

Description copied from class: Expression

All Expressions must implement a default (no-argument) constructor. Those that wish to be serialized to a heap must implement both this and the deserialize method. The Expression may use any method of the Serializer, which implements java.io.DataOutput to write its state.

Overrides:

serialize in class JavaObject

Parameters:

s - the Serializer

Throws:

java.io.IOException

deserialize

public void deserialize(Deserializer s)
                 throws java.io.IOException

Description copied from class: Expression

All Expressions must implement a default (no-argument) constructor. Those that wish to b serialized to a heap must implement both this and the serialize method. The Expression may use any method of the DataInput stream and the Deserializer serialization context to read its state.

Overrides:

deserialize in class JavaObject

Parameters:

s - the Deserializer

Throws:

java.io.IOException

get

public java.lang.Object get()

Overrides:

get in class JavaObject

classOf

public java.lang.Class classOf()

Overrides:

classOf in class JavaObject

display

public void display(ValueWriter w)
             throws java.io.IOException

Overrides:

display in class JavaObject

Throws:

java.io.IOException

eqv

public boolean eqv(java.lang.Object v)

Description copied from class: Value

Compares this Value to another for equality according to the rules of Scheme's eqv?. In SISC, this differs from eq? in that eq? is strict pointer equality.

Overrides:

eqv in class JavaObject

Parameters:

v - the other Value

valueEqual

public boolean valueEqual(Value v)

Description copied from class: Value

Compares this value to another for semantic equality. Used to implement Scheme's 'equal?'. Subclasses must test for pointer equality as well as semantic equality, so that infinite loops on recursive structures are less likely.

Overrides:

valueEqual in class JavaObject

Parameters:

v - the other Value