org.basex.query.xquery.func
Class Fun

java.lang.Object
  org.basex.query.xquery.expr.Expr
      org.basex.query.xquery.func.Fun

Direct Known Subclasses:

FNSimple

public abstract class Fun
extends Expr

Abstract function definition.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Christian Gruen

Field Summary

FunDef

func Function description.

Fields inherited from class org.basex.query.xquery.expr.Expr

type

Constructor Summary

Fun()

Method Summary

Expr	comp(XQContext ctx) Optimizes and compiles the expression tree.
Expr	comp(XQContext ctx, Expr[] arg) Compiles the function.
Item	eval(XQContext ctx) Evaluates the expression and returns the resulting item.
abstract Item	eval(XQContext ctx, Item[] arg) Evaluates the function.
java.lang.String	info() Returns a string description of the expression.
java.lang.String	toString()

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

cls, d, e, i, n, node, s, size, str, u

Methods inherited from class java.lang.Object

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

Field Detail

func

public FunDef func

Function description.

Constructor Detail

Fun

public Fun()

Method Detail

comp

public final Expr comp(XQContext ctx)
                throws XQException

Description copied from class: Expr

Optimizes and compiles the expression tree.

Specified by:

comp in class Expr

Parameters:

ctx - query context

Returns:

optimized Expression

Throws:

XQException - evaluation exception

comp

public Expr comp(XQContext ctx,
                 Expr[] arg)
          throws XQException

Compiles the function.

Parameters:

ctx - xquery context

arg - evaluated arguments

Returns:

evaluated item

Throws:

XQException - evaluation exception

eval

public final Item eval(XQContext ctx)
                throws XQException

Description copied from class: Expr

Evaluates the expression and returns the resulting item.

Specified by:

eval in class Expr

Parameters:

ctx - query context

Returns:

resulting item

Throws:

XQException - evaluation exception

eval

public abstract Item eval(XQContext ctx,
                          Item[] arg)
                   throws XQException

Evaluates the function.

Parameters:

ctx - xquery context

arg - evaluated arguments

Returns:

evaluated item

Throws:

XQException - evaluation exception

info

public final java.lang.String info()

Description copied from class: Expr

Returns a string description of the expression. Contrary to the Expr.toString() method, the current expressions aren't included in the output.

Specified by:

info in class Expr

Returns:

result of check

toString

public final java.lang.String toString()

Specified by:

toString in class Expr