water.rapids.ast.prims.mungers

Class AstIsNa

java.lang.Object

water.Iced<T>

water.rapids.ast.AstRoot<T>

water.rapids.ast.AstPrimitive<T>

water.rapids.ast.AstBuiltin<AstIsNa>

water.rapids.ast.prims.mungers.AstIsNa

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, Freezable<AstIsNa>

public class AstIsNa
extends AstBuiltin<AstIsNa>

Split out in it's own function, instead of Yet Another UniOp, because it needs a "is.NA" check instead of just using the Double.isNaN hack... because it works on UUID and String columns.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AstIsNa()

Method Summary

Modifier and Type	Method and Description
java.lang.String[]	args() List of argument names.
Val	exec(Val... args) Most Ast* functions will want to override this method.
int	nargs() Number of function's arguments + 1.
java.lang.String	str() String representation of this Ast object in the Rapids language.

Methods inherited from class water.rapids.ast.AstBuiltin

apply

Methods inherited from class water.rapids.ast.AstPrimitive

description, example, exec

Methods inherited from class water.rapids.ast.AstRoot

toString

Methods inherited from class water.Iced

asBytes, clone, copyOver, frozenType, read, readExternal, readJSON, reloadFromBytes, toJsonBytes, toJsonString, write, writeExternal, writeJSON

Methods inherited from class java.lang.Object

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

Constructor Detail

AstIsNa

public AstIsNa()

Method Detail

args

public java.lang.String[] args()

Description copied from class: AstPrimitive

List of argument names. The length of the returned array should be equal to `nargs() - 1` (unless `nargs()` returns -1, in which case this function may return {"..."} or something similar).

Specified by:

args in class AstPrimitive<AstIsNa>

str

public java.lang.String str()

Description copied from class: AstRoot

String representation of this Ast object in the Rapids language. For AstPrimitives this is the name of the function; for AstParameters this is either the name of the variable, or the value of the numeric constant that the parameter represents. For more complicated constructs such as AstExec or AstFunction this method should return those objects as a Rapids string.

Specified by:

str in class AstRoot<AstIsNa>

nargs

public int nargs()

Description copied from class: AstPrimitive

Number of function's arguments + 1. Thus, a binary operator like '+' should be declared with 3 nargs: ["+", lhs, rhs]. For variable-argument functions this method should return -1.

Specified by:

nargs in class AstPrimitive<AstIsNa>

exec

public Val exec(Val... args)

Description copied from class: AstBuiltin

Most Ast* functions will want to override this method. The semantics is "call this function with the provided list of arguments".

Overrides:

exec in class AstBuiltin<AstIsNa>