org.basex.query.xpath.expr
Class ArrayExpr

java.lang.Object
  org.basex.query.xpath.expr.Expr
      org.basex.query.xpath.expr.ArrayExpr

Direct Known Subclasses:

And, FTAnd, FTIntersection, FTMildNot, FTNotExprs, FTOr, FTUnaryNot, FTUnion, InterSect, Or, Union

public abstract class ArrayExpr
extends Expr

This is an abstract class for array expressions.

Author:

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

Field Summary

Expr[]

exprs Array with arguments.

Constructor Summary

ArrayExpr()

Method Summary

boolean	sameAs(Expr cmp) Checks current and specified expression for equivalence.
java.lang.String	toString()
boolean	usesPos() Checks whether this Expression (or its children) make use of the position parameter.
boolean	usesSize() Checks whether this Expression (or its children) make use of the setsize parameter.

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

compile, eval, indexEquivalent, indexSizes, returnedValue

Methods inherited from class java.lang.Object

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

Field Detail

exprs

public Expr[] exprs

Array with arguments.

Constructor Detail

ArrayExpr

public ArrayExpr()

Method Detail

sameAs

public final boolean sameAs(Expr cmp)

Description copied from class: Expr

Checks current and specified expression for equivalence.

Overrides:

sameAs in class Expr

Parameters:

cmp - expression to be compared

Returns:

result of check

toString

public final java.lang.String toString()

Specified by:

toString in class Expr

usesPos

public final boolean usesPos()

Description copied from class: Expr

Checks whether this Expression (or its children) make use of the position parameter. If not this allows some nice optimizations.

Specified by:

usesPos in class Expr

Returns:

whether position is used

usesSize

public final boolean usesSize()

Description copied from class: Expr

Checks whether this Expression (or its children) make use of the setsize parameter. If not this allows early predicate evaluation.

Specified by:

usesSize in class Expr

Returns:

whether setsize is used