org.basex.query.util

Class IndexContext

java.lang.Object

org.basex.query.util.IndexContext

public final class IndexContext
extends java.lang.Object

Container for all information needed to determine whether an index is accessible or not.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen, Sebastian Gath

Field Summary

Fields

Modifier and Type	Field and Description
QueryContext	ctx Query context.
Data	data Data reference.
boolean	iterable Flag for iterative evaluation.
boolean	not Flag for ftnot expressions.
boolean	seq Flag for sequential processing.
AxisStep	step Index Step.

Constructor Summary

Constructors

Constructor and Description
IndexContext(QueryContext c, Data d, AxisStep s, boolean i) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	addCosts(int c) Adds the estimated costs.
int	costs() Returns the estimated costs.
void	costs(int c) Sets the estimated costs.
Expr	invert(Expr ex, ParseExpr root, boolean text) Rewrites the specified expression for index access.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ctx

public final QueryContext ctx

Query context.

data

public final Data data

Data reference.

step

public final AxisStep step

Index Step.

iterable

public final boolean iterable

Flag for iterative evaluation.

not

public boolean not

Flag for ftnot expressions.

seq

public boolean seq

Flag for sequential processing.

Constructor Detail

IndexContext

public IndexContext(QueryContext c,
            Data d,
            AxisStep s,
            boolean i)

Constructor.

Parameters:

c - query context

d - data reference

s - index step

i - iterable flag

Method Detail

invert

public Expr invert(Expr ex,
          ParseExpr root,
          boolean text)

Rewrites the specified expression for index access.

Parameters:

ex - expression to be rewritten

root - new root expression

text - text flag

Returns:

index access

addCosts

public void addCosts(int c)

Adds the estimated costs.

Parameters:

c - cost to be added

costs

public void costs(int c)

Sets the estimated costs.

Parameters:

c - cost to be added

costs

public int costs()

Returns the estimated costs.

Returns:

costs