org.vanilladb.core.sql

Class ConstantRange

java.lang.Object

org.vanilladb.core.sql.ConstantRange

Direct Known Subclasses:

DoubleConstantRange, VarcharConstantRange

public abstract class ConstantRange
extends Object

A range of constants. Instance are immutable.

Constructor Summary

Constructors

Constructor and Description
ConstantRange()

Method Summary

Modifier and Type	Method and Description
abstract ConstantRange	applyConstant(Constant c)
abstract ConstantRange	applyHigh(Constant c, boolean incl) Returns a new range with high set to the specified constant if doing so makes the upper bound more strict.
abstract ConstantRange	applyLow(Constant c, boolean inclusive) Returns a new range with low set to the specified constant if doing so makes the lower bound more strict.
abstract Constant	asConstant()
abstract boolean	contains(Constant c)
abstract boolean	contains(ConstantRange r)
abstract boolean	hasLowerBound()
abstract boolean	hasUpperBound()
abstract Constant	high() Returns the higher bound.
abstract ConstantRange	intersect(ConstantRange r)
abstract boolean	isConstant()
abstract boolean	isHighInclusive()
abstract boolean	isLowInclusive()
abstract boolean	isOverlapping(ConstantRange r)
abstract boolean	isValid() Returns whether it is possible to have normal values (e.g., those other than positive and negative infinities, etc.) lying within this range.
abstract boolean	largerThan(Constant c)
abstract double	length()
abstract boolean	lessThan(Constant c)
abstract Constant	low() Returns the lower bound.
static ConstantRange	newInstance(Constant c)
static ConstantRange	newInstance(Constant low, boolean lowIncl, Constant high, boolean highIncl) Constructs a new instance.
String	toString()
abstract ConstantRange	union(ConstantRange r)

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantRange

public ConstantRange()

Method Detail

newInstance

public static ConstantRange newInstance(Constant low,
                                        boolean lowIncl,
                                        Constant high,
                                        boolean highIncl)

Constructs a new instance. If the bounds are numeric, they will be converted to DoubleConstants and an instance of DoubleConstantRange will be returned. Otherwise of the bounds are of string types, an instance of VarcharConstantRange will be returned.

Parameters:

low - the lower bound. null means unbound. Note that low and high cannot be both null.

lowIncl - whether the lower bound is inclusive

high - the higher bound. null means unbound. Note that low and high cannot be both null.

highIncl - whether the higher bound is inclusive

Returns:

a new instance

newInstance

public static ConstantRange newInstance(Constant c)

isValid

public abstract boolean isValid()

Returns whether it is possible to have normal values (e.g., those other than positive and negative infinities, etc.) lying within this range.

Returns:

true if there is possible value

hasLowerBound

public abstract boolean hasLowerBound()

hasUpperBound

public abstract boolean hasUpperBound()

low

public abstract Constant low()

Returns the lower bound. Note that due to the automatic type conversion, the returned constant may have a type different from that of the constant passed at construction time.

Returns:

the lower bound if any, or an exception will be fired

high

public abstract Constant high()

Returns the higher bound. Note that due to the automatic type conversion, the returned constant may have a type different from that of the constant passed at construction time.

Returns:

the higher bound if any, or an exception will be fired

isLowInclusive

public abstract boolean isLowInclusive()

isHighInclusive

public abstract boolean isHighInclusive()

length

public abstract double length()

applyLow

public abstract ConstantRange applyLow(Constant c,
                                       boolean inclusive)

Returns a new range with low set to the specified constant if doing so makes the lower bound more strict.

Parameters:

c - the specified constant

inclusive - whether the constant is inclusive

Returns:

a new range instance with equal or more strict lower bound

applyHigh

public abstract ConstantRange applyHigh(Constant c,
                                        boolean incl)

Returns a new range with high set to the specified constant if doing so makes the upper bound more strict.

Parameters:

c - the specified constant

incl - whether the constant is inclusive

Returns:

a new range instance with equal or more strict upper bound

applyConstant

public abstract ConstantRange applyConstant(Constant c)

isConstant

public abstract boolean isConstant()

asConstant

public abstract Constant asConstant()

contains

public abstract boolean contains(Constant c)

lessThan

public abstract boolean lessThan(Constant c)

largerThan

public abstract boolean largerThan(Constant c)

isOverlapping

public abstract boolean isOverlapping(ConstantRange r)

contains

public abstract boolean contains(ConstantRange r)

intersect

public abstract ConstantRange intersect(ConstantRange r)

union

public abstract ConstantRange union(ConstantRange r)

toString

public String toString()

Overrides:

toString in class Object