org.eigenbase.sarg
Class SargIntervalBase

java.lang.Object
  org.eigenbase.sarg.SargIntervalBase

Direct Known Subclasses:

SargInterval, SargIntervalExpr

public abstract class SargIntervalBase
extends Object

SargIntervalBase is a common base for SargInterval and SargIntervalExpr.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sarg/SargIntervalBase.java#10 $

Author:

John V. Sichi

Field Summary

protected SargFactory	factory
protected SargMutableEndpoint	lowerBound
protected SargMutableEndpoint	upperBound

Constructor Summary

SargIntervalBase(SargFactory factory, RelDataType dataType)

Method Summary

RelDataType	getDataType()
SargFactory	getFactory()
SargEndpoint	getLowerBound()
SargEndpoint	getUpperBound()
boolean	isEmpty()
boolean	isPoint()
boolean	isRange()
boolean	isUnconstrained()
private void	printBound(StringBuilder sb, SargEndpoint endpoint)
(package private) void	setEmpty() Sets this interval to empty (matching nothing at all).
(package private) void	setLower(RexNode coordinate, SargStrictness strictness) Sets the lower bound for this interval.
(package private) void	setNull() Sets this interval to represent a single point matching the null value.
(package private) void	setPoint(RexNode coordinate) Sets this interval to represent a single point (possibly the null value).
(package private) void	setUnconstrained() Sets this interval to unconstrained (matching everything, including null).
(package private) void	setUpper(RexNode coordinate, SargStrictness strictness) Sets the upper bound for this interval.
String	toString()
(package private) void	unsetLower() Removes the lower bound for this interval, setting it to -infinity.
(package private) void	unsetUpper() Removes the upper bound for this interval, setting it to +infinity.

Methods inherited from class java.lang.Object

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

Field Detail

factory

protected final SargFactory factory

lowerBound

protected final SargMutableEndpoint lowerBound

upperBound

protected final SargMutableEndpoint upperBound

Constructor Detail

SargIntervalBase

SargIntervalBase(SargFactory factory,
                 RelDataType dataType)

See Also:

SargFactory.newIntervalExpr(org.eigenbase.reltype.RelDataType)

Method Detail

getLowerBound

public SargEndpoint getLowerBound()

Returns:

an immutable reference to the endpoint representing this interval's lower bound

getUpperBound

public SargEndpoint getUpperBound()

Returns:

an immutable reference to the endpoint representing this interval's upper bound

isPoint

public boolean isPoint()

Returns:

whether this represents a single point

isEmpty

public boolean isEmpty()

Returns:

whether this represents the empty interval

isRange

public boolean isRange()

Returns:

whether this represents a (non-empty, non-point) range interval

isUnconstrained

public boolean isUnconstrained()

Returns:

whether this represents the universal set

getFactory

public SargFactory getFactory()

Returns:

the factory which produced this expression

setPoint

void setPoint(RexNode coordinate)

Sets this interval to represent a single point (possibly the null value).

Parameters:

coordinate - coordinate of point to set, or null for the null value

setNull

void setNull()

Sets this interval to represent a single point matching the null value.

setLower

void setLower(RexNode coordinate,
              SargStrictness strictness)

Sets the lower bound for this interval.

Parameters:

coordinate - coordinate of point to set, must not be null

strictness - strictness

setUpper

void setUpper(RexNode coordinate,
              SargStrictness strictness)

Sets the upper bound for this interval.

Parameters:

coordinate - coordinate of point to set

strictness - boundary strictness

unsetLower

void unsetLower()

Removes the lower bound for this interval, setting it to -infinity.

unsetUpper

void unsetUpper()

Removes the upper bound for this interval, setting it to +infinity.

setUnconstrained

void setUnconstrained()

Sets this interval to unconstrained (matching everything, including null).

setEmpty

void setEmpty()

Sets this interval to empty (matching nothing at all).

getDataType

public RelDataType getDataType()

toString

public String toString()

Overrides:

toString in class Object

printBound

private void printBound(StringBuilder sb,
                        SargEndpoint endpoint)