org.eigenbase.rel
Class RelCollationImpl

java.lang.Object
  org.eigenbase.rel.RelCollationImpl

All Implemented Interfaces:

RelCollation

public class RelCollationImpl
extends Object
implements RelCollation

Simple implementation of RelCollation.

Since:

March 6, 2006

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/RelCollationImpl.java#6 $

Author:

jhyde

Field Summary

private List<RelFieldCollation>	fieldCollations
static List<RelCollation>	Singleton0 An ordering by the zeroth column.

Constructor Summary

RelCollationImpl(List<RelFieldCollation> fieldCollations)

Method Summary

static List<RelCollation>	createSingleton(int fieldIndex) Creates a list containing one collation containing one field.
static boolean	equal(List<RelCollation> collationList1, List<RelCollation> collationList2)
boolean	equals(Object obj)
List<RelFieldCollation>	getFieldCollations() Returns the ordinals and directions of the columns in this ordering.
int	hashCode()
static boolean	isValid(RelDataType rowType, List<RelCollation> collationList, boolean fail) Checks that a collection of collations is valid.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

Singleton0

public static final List<RelCollation> Singleton0

An ordering by the zeroth column.

fieldCollations

private final List<RelFieldCollation> fieldCollations

Constructor Detail

RelCollationImpl

public RelCollationImpl(List<RelFieldCollation> fieldCollations)

Method Detail

getFieldCollations

public List<RelFieldCollation> getFieldCollations()

Description copied from interface: RelCollation

Returns the ordinals and directions of the columns in this ordering.

Specified by:

getFieldCollations in interface RelCollation

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

createSingleton

public static List<RelCollation> createSingleton(int fieldIndex)

Creates a list containing one collation containing one field.

isValid

public static boolean isValid(RelDataType rowType,
                              List<RelCollation> collationList,
                              boolean fail)

Checks that a collection of collations is valid.

Parameters:

rowType - Row type of the relational expression

collationList - List of collations

fail - Whether to fail if invalid

Returns:

Whether valid

equal

public static boolean equal(List<RelCollation> collationList1,
                            List<RelCollation> collationList2)