Package nz.org.riskscape.engine.sort

Class SortBy

java.lang.Object

nz.org.riskscape.engine.sort.SortBy

public class SortBy
extends Object

Defines an sort by, consisting of an Expression to obtain a comparable value and SortBy.Direction.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	SortBy.Direction

Field Summary

Fields

Modifier and Type	Field	Description
static final SortBy	NONE

Constructor Summary

Constructors

Constructor	Description
SortBy(Expression expr, SortBy.Direction dir)
SortBy(Expression expr, SortBy.Direction direction, SortBy next)	Creates a new SortBy instance.

Method Summary

Modifier and Type	Method	Description
SortBy	andThen(SortBy asNext)	Builds a new SortBy clause where asNext is appended to the end of this SortBy chain.
protected boolean	canEqual(Object other)
static SortBy	concatenate(List<SortBy> clauses)	Concatenate a list of SortBys, return a new SortBy where the (n+1)th element is subordinate to the nth.
static SortBy	concatenate(SortBy... clauses)	Convenience version of concatenate(List)
boolean	equals(Object o)
SortBy.Direction	getDirection()	The direction in which to sort.
Expression	getExpr()	Expression to extract value to sort by.
SortBy	getNext()	A subordinate, sort order
int	hashCode()
String	toString()
List<Problem>	validate(Struct tupleType, ExpressionRealizer expressionRealizer)	Validate that tupleType would be able to be sorted by this SortBy.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

NONE

public static final SortBy NONE

Constructor Details

SortBy

public SortBy(Expression expr,
 SortBy.Direction dir)

SortBy

public SortBy(Expression expr,
 SortBy.Direction direction,
 SortBy next)

Creates a new SortBy instance.

Parameters:

expr - Expression to extract value to sort by.

direction - The direction in which to sort.

next - A subordinate, sort order

Method Details

concatenate

public static SortBy concatenate(SortBy... clauses)

Convenience version of concatenate(List)

concatenate

public static SortBy concatenate(List<SortBy> clauses)

Concatenate a list of SortBys, return a new SortBy where the (n+1)th element is subordinate to the nth.

validate

public List<Problem> validate(Struct tupleType,
 ExpressionRealizer expressionRealizer)

Validate that tupleType would be able to be sorted by this SortBy.

Parameters:

tupleType -

expressionRealizer - to realize expressions with

Returns:

problems encountered, if any

andThen

public SortBy andThen(SortBy asNext)

Builds a new SortBy clause where asNext is appended to the end of this SortBy chain.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

canEqual

protected boolean canEqual(Object other)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getExpr

public Expression getExpr()

Expression to extract value to sort by.

getDirection

public SortBy.Direction getDirection()

The direction in which to sort.

getNext

public SortBy getNext()

A subordinate, sort order