org.basex.query.util

Class VarStack

java.lang.Object

org.basex.data.ExprInfo

org.basex.query.util.VarStack

public final class VarStack
extends ExprInfo

Variable stack.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen

Field Summary

Fields

Modifier and Type	Field and Description
int	size Number of stored variables.
Var[]	vars Variable expressions.

Constructor Summary

Constructors

Constructor and Description
VarStack() Default constructor.
VarStack(int c) Default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(Var v) Adds the specified variable.
void	checkUp() Checks if none of the variables contains an updating expression.
boolean	contains(Var v) Checks if the given variable is in this list.
Var	get(QNm name) Returns a variable with the specified name; should only be used while parsing because it ignores ids of variables.
Var	get(Var v) Returns a variable with the same id.
void	plan(Serializer ser) Serializes the expression tree.
java.lang.String	toString()
void	update(Var v) Adds or replaces the specified variable.

Methods inherited from class org.basex.data.ExprInfo

description, info

Methods inherited from class java.lang.Object

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

Field Detail

vars

public Var[] vars

Variable expressions.

size

public int size

Number of stored variables.

Constructor Detail

VarStack

public VarStack()

Default constructor.

VarStack

public VarStack(int c)

Default constructor.

Parameters:

c - initial capacity

Method Detail

update

public void update(Var v)

Adds or replaces the specified variable.

Parameters:

v - variable

add

public void add(Var v)

Adds the specified variable.

Parameters:

v - variable

get

public Var get(QNm name)

Returns a variable with the specified name; should only be used while parsing because it ignores ids of variables.

Parameters:

name - variable name

Returns:

variable

get

public Var get(Var v)

Returns a variable with the same id.

Parameters:

v - variable

Returns:

variable

contains

public boolean contains(Var v)

Checks if the given variable is in this list.

Parameters:

v - variable

Returns:

true if the variable was found, false otherwise

checkUp

public void checkUp()
             throws QueryException

Checks if none of the variables contains an updating expression.

Throws:

QueryException - query exception

plan

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

Description copied from class: ExprInfo

Serializes the expression tree.

Specified by:

plan in class ExprInfo

Parameters:

ser - serializer

Throws:

java.io.IOException - I/O exception

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo