org.basex.query.xpath.item
Class Bln

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

All Implemented Interfaces:

Result

public final class Bln
extends Item

XPath Value representing a boolean.

Author:

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

Field Summary

static Bln	FALSE Static false value.
static Bln	TRUE Static true value.

Method Summary

boolean	appr(Item v) Checks the approximate equality of the value and the specified value.
boolean	apprContains(Item v) Checks whether this value approximately contains the word(s) in val.
boolean	bool() Returns the boolean value.
boolean	eq(Item v) Checks the equality of the value and the specified value.
Bln	eval(XPContext ctx) Evaluates the expression with the specified context set.
static Bln	get(boolean val) Returns an instance of this class.
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

TRUE

public static final Bln TRUE

Static true value.

FALSE

public static final Bln FALSE

Static false value.

Method Detail

get

public static Bln get(boolean val)

Returns an instance of this class.

Parameters:

val - boolean value

Returns:

class instance

eval

public Bln 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

num

public double num()

Description copied from class: Item

Returns the double value.

Specified by:

num in class Item

Returns:

double value

str

public byte[] str()

Description copied from class: Item

Returns the literal value.

Specified by:

str in class Item

Returns:

literal value

prec

public int prec()

Description copied from class: Item

Returns the evaluation precedence.

Returns:

evaluation precedence

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.

apprContains

public boolean apprContains(Item v)

Description copied from class: Item

Checks whether this value approximately contains the word(s) in val.

Parameters:

v - value to be compared

Returns:

result of comparison.

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