org.basex.query.xquery.expr
Class Cast

java.lang.Object
  org.basex.query.xquery.expr.Expr
      org.basex.query.xquery.expr.Cast

public final class Cast
extends Expr

Cast expression.

Author:

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

Field Summary

Expr	expr Argument.
SeqType	seq Type.

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

type

Constructor Summary

Cast(Expr e, SeqType t)
Function constructor.

Method Summary

Item	cast(Item it, XQContext ctx) Casts the specified item.
Expr	comp(XQContext ctx) Optimizes and compiles the expression tree.
Item	eval(XQContext ctx) Evaluates the expression and returns the resulting item.
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

expr

public Expr expr

Argument.

seq

public final SeqType seq

Type.

Constructor Detail

Cast

public Cast(Expr e,
            SeqType t)

Function constructor.

Parameters:

e - expression

t - data type

Method Detail

cast

public Item cast(Item it,
                 XQContext ctx)
          throws XQException

Casts the specified item.

Parameters:

it - item to be cast

ctx - xquery context

Returns:

cast item

Throws:

XQException - evaluation exception

comp

public 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

eval

public 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

info

public 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 java.lang.String toString()

Specified by:

toString in class Expr