org.basex.query.util
Class Functions

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.util.Functions

public final class Functions
extends ExprInfo

Global expression context.

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Constructor Summary

Functions()

Method Summary

int	add(Func fun) Adds a local function.
void	check() Checks if all functions have been correctly initialized.
void	comp(QueryContext ctx) Compiles the functions.
void	funError(QNm name) Finds similar function names and throws an error message.
Func	get(int id) Returns the function with the specified id.
Expr	get(QNm name, Expr[] args, QueryContext ctx) Returns the specified function.
void	plan(Serializer ser) Recursively sends the abstract syntax of this expression to the specified serializer.
String	toString()

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

Constructor Detail

Functions

public Functions()

Method Detail

get

public Func get(int id)

Returns the function with the specified id.

Parameters:

id - function id

Returns:

function

get

public Expr get(QNm name,
                Expr[] args,
                QueryContext ctx)
         throws QueryException

Returns the specified function.

Parameters:

name - name of the function

args - optional arguments

ctx - query context

Returns:

function instance

Throws:

QueryException - query exception

add

public int add(Func fun)
        throws QueryException

Adds a local function.

Parameters:

fun - function instance

Returns:

function id

Throws:

QueryException - query exception

comp

public void comp(QueryContext ctx)
          throws QueryException

Compiles the functions.

Parameters:

ctx - query context

Throws:

QueryException - query exception

check

public void check()
           throws QueryException

Checks if all functions have been correctly initialized.

Throws:

QueryException - query exception

funError

public void funError(QNm name)
              throws QueryException

Finds similar function names and throws an error message.

Parameters:

name - function name

Throws:

QueryException - query exception

plan

public void plan(Serializer ser)
          throws 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:

IOException - I/O exception

toString

public String toString()

Specified by:

toString in class ExprInfo