IsSet (Smithy API 1.36.0)

java.lang.Object
- software.amazon.smithy.rulesengine.language.util.MandatorySourceLocation
- - software.amazon.smithy.rulesengine.language.syntax.expr.Expression
  - - software.amazon.smithy.rulesengine.language.syntax.fn.Function
    - - software.amazon.smithy.rulesengine.language.syntax.fn.IsSet

All Implemented Interfaces:

FromSourceLocation, ToNode, Into<Condition>, TypeCheck
```
public final class IsSet
extends Function
```
A rule-set function for determining whether a reference parameter is set.

Field Summary

Fields
Modifier and Type Field Description

static java.lang.String ID
- Fields inherited from class software.amazon.smithy.rulesengine.language.syntax.fn.Function
  functionNode

Constructor Summary

Constructors
Constructor Description

IsSet(FunctionNode functionNode)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`<R> R`	`accept(ExpressionVisitor<R> visitor)`	Invoke the `ExpressionVisitor` functions for this expression.
`Expression`	`getTarget()`
`static IsSet`	`ofExpression(Expression expression)`	Returns a new IsSet function taking the given expression as an argument.
`protected Type`	`typeCheckArgument(Scope<Type> scope, Type.Option arg)`
`protected Type`	`typeCheckLocal(Scope<Type> scope)`

Methods inherited from class software.amazon.smithy.rulesengine.language.syntax.fn.Function
condition, condition, equals, expectOneArgument, getArguments, getName, getSourceLocation, hashCode, into, toNode, toString

Methods inherited from class software.amazon.smithy.rulesengine.language.syntax.expr.Expression
equal, equal, fromNode, getAttr, getAttr, isSet, isValidHostLabel, isVirtualHostableS3Bucket, literal, not, of, of, of, parseArn, parseShortform, parseUrl, reference, substring, template, type, typeCheck

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - ID
```
public static final java.lang.String ID
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - IsSet
```
public IsSet(FunctionNode functionNode)
```
- Method Detail
  - ofExpression
```
public static IsSet ofExpression(Expression expression)
```
    Returns a new IsSet function taking the given expression as an argument.
    
    Parameters:
    
    expression - the argument to IsSet.
    
    Returns:
    
    new IsSet instance.
  - typeCheckArgument
```
protected Type typeCheckArgument(Scope<Type> scope,
                                 Type.Option arg)
```
  - accept
```
public <R> R accept(ExpressionVisitor<R> visitor)
```
    Description copied from class: Expression
    
    Invoke the ExpressionVisitor functions for this expression.
    
    Specified by:
    
    accept in class Expression
    
    Type Parameters:
    
    R - the visitor return type.
    
    Parameters:
    
    visitor - the visitor to be invoked.
    
    Returns:
    
    the return value of the visitor.
  - getTarget
```
public Expression getTarget()
```
  - typeCheckLocal
```
protected Type typeCheckLocal(Scope<Type> scope)
```
    Specified by:
    
    typeCheckLocal in class Expression