Package net.hydromatic.morel.ast

Class Core.Order

java.lang.Object

net.hydromatic.morel.ast.AstNode

net.hydromatic.morel.ast.Core.BaseNode

net.hydromatic.morel.ast.Core.FromStep

net.hydromatic.morel.ast.Core.Order

Enclosing class:

Core

public static class Core.Order
extends Core.FromStep

An order clause in a from expression.

Field Summary

Fields

Modifier and Type	Field	Description
final Core.Exp	exp

Fields inherited from class net.hydromatic.morel.ast.Core.FromStep

env

Fields inherited from class net.hydromatic.morel.ast.AstNode

op, pos

Constructor Summary

Constructors

Constructor	Description
Order(Core.StepEnv env, Core.Exp exp)

Method Summary

Modifier and Type	Method	Description
Core.Order	accept(Shuttle shuttle)	Accepts a shuttle, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.
void	accept(Visitor visitor)	Accepts a visitor, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.
Core.Order	copy(Core.StepEnv env, Core.Exp exp)
boolean	isOrdered(boolean inputIsOrdered)	Returns whether the output of this step is ordered, given whether the input is ordered.
protected AstWriter	unparse(AstWriter w, Core.From from, int ordinal, int left, int right)

Methods inherited from class net.hydromatic.morel.ast.Core.FromStep

unparse

Methods inherited from class net.hydromatic.morel.ast.AstNode

toString, unparse

Methods inherited from class java.lang.Object

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

Field Details

exp

public final Core.Exp exp

Constructor Details

Order

Order(Core.StepEnv env,
 Core.Exp exp)

Method Details

isOrdered

public boolean isOrdered(boolean inputIsOrdered)

Returns whether the output of this step is ordered, given whether the input is ordered.

For example, Core.Where and Core.Yield are ordered if and only if their input is ordered; Core.Order is always ordered; Core.Group is unordered.

Order is always ordered. If there are zero keys, or the keys not exhaustive, the order is not deterministic, but the ordering is still clearly part of the information in the value.

Overrides:

isOrdered in class Core.FromStep

accept

public Core.Order accept(Shuttle shuttle)

Description copied from class: AstNode

Accepts a shuttle, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.

Specified by:

accept in class Core.FromStep

accept

public void accept(Visitor visitor)

Description copied from class: AstNode

Accepts a visitor, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.

Overrides:

accept in class Core.BaseNode

unparse

protected AstWriter unparse(AstWriter w,
 Core.From from,
 int ordinal,
 int left,
 int right)

Specified by:

unparse in class Core.FromStep

copy

public Core.Order copy(Core.StepEnv env,
 Core.Exp exp)