org.basex.query.xpath.values
Class Num

java.lang.Object
  org.basex.query.xpath.expr.Expr
      org.basex.query.xpath.values.Item
          org.basex.query.xpath.values.Num

All Implemented Interfaces:

Result

public final class Num
extends Item

XPath value type modeling a number.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Tim Petrowsky

Field Summary

static Num

ONE Static number.

Constructor Summary

Num(byte[] n)
Constructor.

Num(double n)
Constructor.

Num(long n)
Constructor.

Method Summary

boolean	appr(Item v) Checks the approximate equality of the value and the specified value.
boolean	bool() Returns the boolean value.
boolean	eq(Item v) Checks the equality of the value and the specified value.
Num	eval(XPContext ctx) Evaluates the expression with the specified context set.
double	num() Returns the double value.
int	prec() Returns the evaluation precedence.
byte[]	str() Returns the literal value.
java.lang.String	toString()

Methods inherited from class org.basex.query.xpath.values.Item

compile, sameAs, serialize, serialize, size, usesPos, usesSize

Methods inherited from class org.basex.query.xpath.expr.Expr

indexEquivalent, indexSizes, returnedValue, sameAs

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ONE

public static final Num ONE

Static number.

Constructor Detail

Num

public Num(byte[] n)

Constructor.

Parameters:

n - number to be represented.

Num

public Num(double n)

Constructor.

Parameters:

n - number to be represented.

Num

public Num(long n)

Constructor.

Parameters:

n - number to be represented.

Method Detail

appr

public boolean appr(Item v)

Description copied from class: Item

Checks the approximate equality of the value and the specified value.

Parameters:

v - value to be compared

Returns:

result of comparison.

bool

public boolean bool()

Description copied from class: Item

Returns the boolean value.

Specified by:

bool in class Item

Returns:

boolean value

eq

public boolean eq(Item v)

Description copied from class: Item

Checks the equality of the value and the specified value.

Specified by:

eq in class Item

Parameters:

v - value to be compared

Returns:

result of comparison.

eval

public Num eval(XPContext ctx)

Description copied from class: Expr

Evaluates the expression with the specified context set. Additionally provides a context

Specified by:

eval in class Expr

Parameters:

ctx - query context

Returns:

resulting XPathValue

num

public double num()

Description copied from class: Item

Returns the double value.

Specified by:

num in class Item

Returns:

double value

prec

public int prec()

Description copied from class: Item

Returns the evaluation precedence.

Returns:

evaluation precedence

str

public byte[] str()

Description copied from class: Item

Returns the literal value.

Specified by:

str in class Item

Returns:

literal value

toString

public java.lang.String toString()

Specified by:

toString in class Item