org.basex.query.xpath.item
Class Dbl

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.xpath.expr.Expr
          org.basex.query.xpath.item.Item
              org.basex.query.xpath.item.Dbl

All Implemented Interfaces:

Result

public final class Dbl
extends Item

XPath value type modeling a number.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Tim Petrowsky

Field Summary

static Dbl	ONE Static number.
static Dbl	ZERO Static number.

Constructor Summary

Dbl(byte[] n)
Constructor.

Dbl(double n)
Constructor.

Dbl(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.
Dbl	eval(XPContext ctx) Evaluates the expression with the specified context set.
double	num() Returns the double value.
void	plan(Serializer ser) Recursively sends the abstract syntax of this expression to the specified serializer.
int	prec() Returns the evaluation precedence.
byte[]	str() Returns the literal value.
java.lang.String	toString()

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

comp, same, serialize, serialize, size, usesPos, usesSize

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

indexEquivalent, indexSizes, returnedValue, sameAs

Methods inherited from class org.basex.query.ExprInfo

color, info, name

Methods inherited from class java.lang.Object

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

Field Detail

ZERO

public static final Dbl ZERO

Static number.

ONE

public static final Dbl ONE

Static number.

Constructor Detail

Dbl

public Dbl(double n)

Constructor.

Parameters:

n - number to be represented.

Dbl

public Dbl(long n)

Constructor.

Parameters:

n - number to be represented.

Dbl

public Dbl(byte[] n)

Constructor.

Parameters:

n - number to be represented.

Method Detail

eval

public Dbl 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

bool

public boolean bool()

Description copied from class: Item

Returns the boolean value.

Specified by:

bool in class Item

Returns:

boolean value

str

public byte[] str()

Description copied from class: Item

Returns the literal value.

Specified by:

str in class Item

Returns:

literal value

num

public double num()

Description copied from class: Item

Returns the double value.

Specified by:

num in class Item

Returns:

double 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.

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.

prec

public int prec()

Description copied from class: Item

Returns the evaluation precedence.

Returns:

evaluation precedence

toString

public java.lang.String toString()

Specified by:

toString in class Item

plan

public void plan(Serializer ser)
          throws java.io.IOException

Description copied from class: ExprInfo

Recursively sends the abstract syntax of this expression to the specified serializer.

Specified by:

plan in class ExprInfo

Parameters:

ser - serializer

Throws:

java.io.IOException - exception