org.basex.query.xpath.func
Class XPathContext

java.lang.Object
  org.basex.query.xpath.func.XPathContext

public final class XPathContext
extends java.lang.Object

Global expression context.

Author:

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

Method Summary

Item	evalVariable(byte[] name) Evaluates a variable.
static XPathContext	get() Returns single instance of this class.
Func	getFunction(byte[] name, Expr[] args) Evaluates the specified function.
void	registerVariable(java.lang.String name, byte[] value) Registers a variable.
void	registerVariable(java.lang.String variableName, double value) Registers a variable.

Methods inherited from class java.lang.Object

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

Method Detail

evalVariable

public Item evalVariable(byte[] name)
                  throws ParseException

Evaluates a variable.

Parameters:

name - name of the variable

Returns:

resulting XPathValue

Throws:

ParseException - parsing exception

get

public static XPathContext get()

Returns single instance of this class.

Returns:

class instance

getFunction

public Func getFunction(byte[] name,
                        Expr[] args)
                 throws ParseException

Evaluates the specified function.

Parameters:

name - name of the function

args - optional arguments

Returns:

resulting XPathValue

Throws:

ParseException - parsing exception

registerVariable

public void registerVariable(java.lang.String name,
                             byte[] value)

Registers a variable.

Parameters:

name - name of the variable.

value - variable as string.

registerVariable

public void registerVariable(java.lang.String variableName,
                             double value)

Registers a variable.

Parameters:

variableName - name of the variable.

value - double value of variable.