Package dev.frostlake.executor.expressions

Class CastExpression

java.lang.Object

dev.frostlake.executor.expressions.CastExpression

All Implemented Interfaces:

Expression

public class CastExpression
extends Object
implements Expression

Represents a type cast (e.g., CAST(x AS INTEGER), x::VARCHAR). When tryMode is set (TRY_CAST), a failed conversion yields NULL instead of raising an error.

A PARAMETERIZED target whose parameters decide the cast's legality and result — a STRUCTURED type (OBJECT(x VARCHAR), ARRAY(INT), MAP(k,v)) or a VECTOR(FLOAT|INT, n) — is carried as a parsed DataType alongside the target-type text, together with the optional RENAME FIELDS / ADD FIELDS modifier. Those parameters must survive from the parse tree rather than being re-derived from the (whitespace-stripped) target text.

Constructor Summary

Constructors

Constructor	Description
CastExpression(Expression expression, String targetType)
CastExpression(Expression expression, String targetType, boolean tryMode)
CastExpression(Expression expression, String targetType, boolean tryMode, DataType declaredTarget, CastFieldsModifier fieldsModifier)

Method Summary

Modifier and Type	Method	Description
<T> T	accept(ExpressionVisitor<T> visitor)	Accept a visitor for the visitor pattern
DataType	getDeclaredTarget()	The parsed target type when its PARAMETERS matter (a structured type, or a VECTOR(t, n)), or null when the plain target-type text says everything.
Expression	getExpression()
CastFieldsModifier	getFieldsModifier()	The RENAME FIELDS / ADD FIELDS modifier, never null.
SourcePosition	getPosition()	Where the cast was written, relative to its fragment — the :: of the shorthand, the CAST or TRY_CAST keyword otherwise — or null for a cast the engine built itself.
String	getTargetType()
boolean	isTryMode()
void	setPosition(SourcePosition position)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

CastExpression

public CastExpression(Expression expression,
 String targetType)

CastExpression

public CastExpression(Expression expression,
 String targetType,
 boolean tryMode)

CastExpression

public CastExpression(Expression expression,
 String targetType,
 boolean tryMode,
 DataType declaredTarget,
 CastFieldsModifier fieldsModifier)

Method Details

getExpression

public Expression getExpression()

getTargetType

public String getTargetType()

isTryMode

public boolean isTryMode()

getDeclaredTarget

public DataType getDeclaredTarget()

The parsed target type when its PARAMETERS matter (a structured type, or a VECTOR(t, n)), or null when the plain target-type text says everything.

getFieldsModifier

public CastFieldsModifier getFieldsModifier()

The RENAME FIELDS / ADD FIELDS modifier, never null.

getPosition

public SourcePosition getPosition()

Where the cast was written, relative to its fragment — the :: of the shorthand, the CAST or TRY_CAST keyword otherwise — or null for a cast the engine built itself. A refusal of the cast as a whole is positioned there: live points v::VECTOR(INT,3) at the ::.

setPosition

public void setPosition(SourcePosition position)

accept

public <T> T accept(ExpressionVisitor<T> visitor)

Description copied from interface: Expression

Accept a visitor for the visitor pattern

Specified by:

accept in interface Expression

toString

public String toString()

Overrides:

toString in class Object