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 gw.internal.gosu.parser.Expression
  _type
- Fields inherited from class gw.internal.gosu.parser.ParsedElement
  _tokens, UNDEF_FILE, UNDEF_FUNCTION, UNDEF_MODULE
- Fields inherited from interface gw.lang.parser.IExpression
  EMPTY_ARRAY

Constructor Summary

Constructors
Constructor Description

NullExpression()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.Object`	`evaluate()`	Evaluates this Expression and returns the result.
`static NullExpression`	`instance()`
`boolean`	`isCompileTimeConstant()`
`java.lang.String`	`toString()`	Subclasses should return a String representing the parsed expression.

Methods inherited from class gw.internal.gosu.parser.Expression
evaluate, getContextType, getReturnType, getType, getTypeImpl, isNullSafe, isUnchecked, setType

Methods inherited from class gw.internal.gosu.parser.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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface gw.lang.parser.IExpression
evaluate, getContextType, isNullSafe, isUnchecked

Methods inherited from interface gw.lang.parser.IHasType
getType

Methods inherited from interface gw.lang.parser.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 Detail
  - NULL
```
private static LockingLazyVar<NullExpression> NULL
```
- Constructor Detail
  - NullExpression
```
public NullExpression()
```
- Method Detail
  - instance
```
public static NullExpression instance()
```
  - isCompileTimeConstant
```
public boolean isCompileTimeConstant()
```
    Specified by:
    
    isCompileTimeConstant in interface IParsedElement
    
    Overrides:
    
    isCompileTimeConstant in class ParsedElement
  - evaluate
```
public java.lang.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 java.lang.String toString()
```
    Description copied from class: Expression
    
    Subclasses should return a String representing the parsed expression.
    
    Specified by:
    
    toString in class Expression