Class NullExpression

java.lang.Object

gw.internal.gosu.parser.ParsedElement

gw.internal.gosu.parser.Expression

gw.internal.gosu.parser.expressions.Literal

gw.internal.gosu.parser.expressions.NullExpression

All Implemented Interfaces:

ILiteralExpression, INullExpression, IExpression, IHasType, IParsedElement

public final class NullExpression
extends Literal
implements INullExpression

An expression representing a 'null' expression i.e., the null keyword.

Field Summary

Fields

Modifier and Type	Field	Description
private static LockingLazyVar<NullExpression>	NULL

Fields inherited from class Expression

_type

Fields inherited from class ParsedElement

_tokens, UNDEF_FILE, UNDEF_FUNCTION, UNDEF_MODULE

Fields inherited from interface IExpression

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
NullExpression()

Method Summary

Modifier and Type	Method	Description
Object	evaluate()	Evaluates this Expression and returns the result.
static NullExpression	instance()
boolean	isCompileTimeConstant()
String	toString()	Subclasses should return a String representing the parsed expression.

Methods inherited from class Expression

evaluate, getContextType, getReturnType, getType, getTypeImpl, isNullSafe, isUnchecked, setType

Methods inherited from class ParsedElement

addExceptionsFrom, addParseException, addParseException, addParseException, addParseExceptions, addParseIssues, addParseWarning, addParseWarning, addParseWarnings, addToken, adjustColumn, adjustLineNum, assignTokens, clearParseExceptions, clearParseTreeInformation, clearParseWarnings, compactParseTree, findAncestorParsedElementByType, findDeclaringStatement, findLineNumberOfDeclaration, findRootParsedElement, getAnnotations, getColumn, getContainedParsedElementsByType, getContainedParsedElementsByTypes, getContainedParsedElementsByTypesWithIgnoreSet, getEnclosingFeatureInfo, getFunctionName, getGosuClass, getGosuProgram, getImmediateParseIssue, getImmediateParseIssues, getLineNum, getLocation, getModule, getParent, getParseExceptions, getParseIssues, getParseWarnings, getQualifyingEnclosingTypeInfo, getTokens, hasImmediateParseIssue, hasImmediateParseWarning, hasImmediateParseWarnings, hasParseException, hasParseExceptions, hasParseIssue, hasParseIssues, hasParseWarning, hasParseWarnings, initEmptyParseTree, initLocation, isSuppressed, isSuppressed, isSynthetic, makeDoubleValue, makeFloatValue, makeInteger, makeLong, removeParseException, removeParseWarning, removeParseWarningRecursively, setGosuProgram, setLineNum, setLocation, setParent, setSynthetic, shouldClearParseInfo, visit

Methods inherited from class Object

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

Methods inherited from interface IExpression

evaluate, getContextType, isNullSafe, isUnchecked

Methods inherited from interface IHasType

getType

Methods inherited from interface IParsedElement

addExceptionsFrom, addParseException, addParseException, addParseWarning, addParseWarning, clearParseExceptions, clearParseTreeInformation, clearParseWarnings, findAncestorParsedElementByType, findDeclaringStatement, findRootParsedElement, getColumn, getContainedParsedElementsByType, getContainedParsedElementsByTypes, getContainedParsedElementsByTypesWithIgnoreSet, getFunctionName, getGosuClass, getGosuProgram, getImmediateParseIssue, getImmediateParseIssues, getLineNum, getLocation, getModule, getParent, getParseExceptions, getParseIssues, getParseWarnings, getReturnType, getTokens, hasImmediateParseIssue, hasImmediateParseWarnings, hasParseException, hasParseExceptions, hasParseIssue, hasParseIssues, hasParseWarning, hasParseWarnings, isSuppressed, isSynthetic, setLocation, setParent, visit

Field Details

NULL

private static LockingLazyVar<NullExpression> NULL

Constructor Details

NullExpression

public NullExpression()

Method Details

instance

public static NullExpression instance()

isCompileTimeConstant

public boolean isCompileTimeConstant()

Specified by:

isCompileTimeConstant in interface IParsedElement

Overrides:

isCompileTimeConstant in class ParsedElement

evaluate

public Object evaluate()

Description copied from interface: IExpression

Evaluates this Expression and returns the result.

Specified by:

evaluate in interface IExpression

Overrides:

evaluate in class Expression

toString

public String toString()

Description copied from class: Expression

Subclasses should return a String representing the parsed expression.

Specified by:

toString in class Expression