org.basex.query.path
Class Path

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.expr.Expr
          org.basex.query.path.Path

Direct Known Subclasses:

AxisPath, MixedPath

public abstract class Path
extends Expr

Path expression.

Author:

Workgroup DBIS, University of Konstanz 2005-09, ISC License, Christian Gruen

Field Summary

Expr	root Top expression.

Constructor Summary

Path(Expr r)
Constructor.

Method Summary

java.lang.String	color() Returns a string description of the expression.
Expr	comp(QueryContext ctx) Optimizes and compiles the expression.
Expr	remove(Var v) Removes the specified variable in a sub expression.
java.lang.String	toString(Expr[] step) Returns a string representation.

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

addText, atomic, checkCtx, checkDbl, checkItr, duplicates, e, ebv, i, indexAccessible, indexEquivalent, iter, removable, returned, sameAs, size, test, uses

Methods inherited from class org.basex.query.ExprInfo

info, name, plan, toString

Methods inherited from class java.lang.Object

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

Field Detail

root

public Expr root

Top expression.

Constructor Detail

Path

public Path(Expr r)

Constructor.

Parameters:

r - root expression; can be null

Method Detail

comp

public Expr comp(QueryContext ctx)
          throws QueryException

Description copied from class: Expr

Optimizes and compiles the expression.

Specified by:

comp in class Expr

Parameters:

ctx - query context

Returns:

optimized Expression

Throws:

QueryException - evaluation exception

remove

public Expr remove(Var v)

Description copied from class: Expr

Removes the specified variable in a sub expression.

Overrides:

remove in class Expr

Parameters:

v - variable to be removed

Returns:

expression with removed variable

color

public final java.lang.String color()

Description copied from class: ExprInfo

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

Overrides:

color in class ExprInfo

Returns:

result of check

toString

public java.lang.String toString(Expr[] step)

Returns a string representation.

Parameters:

step - step array

Returns:

string representation