org.basex.query.xpath
Class XPContext

java.lang.Object
  org.basex.core.Progress
      org.basex.query.QueryContext
          org.basex.query.xpath.XPContext

public final class XPContext
extends QueryContext

Query context.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Tim Petrowsky

Field Summary

int	ftcount Count number of xpath fulltext query tokens.
FTTokenizer	ftitem Current fulltext item.
FTPosFilter	ftpos Current fulltext position filter.
Nod	item Data reference.
boolean	iu Flag for fulltext index use.
boolean	leaf Leaf flag.

Fields inherited from class org.basex.query.QueryContext

file, PLAN, query

Constructor Summary

XPContext(Expr expr, java.lang.String qu)
Constructor.

Method Summary

XPContext	compile(Nodes n) Optimizes the expression.
Item	eval(Expr e) Evaluates the expression with the specified context set.
Result	eval(Nodes nodes) Evaluates the expression with the specified context set.
void	plan(Serializer ser) Recursively serializes the query plan.

Methods inherited from class org.basex.query.QueryContext

compInfo, det, evalInfo, info, planDot, planXML, prog, tit

Methods inherited from class org.basex.core.Progress

checkStop, detail, progress, progress, stop, title

Methods inherited from class java.lang.Object

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

Field Detail

item

public Nod item

Data reference.

leaf

public boolean leaf

Leaf flag.

ftcount

public int ftcount

Count number of xpath fulltext query tokens.

ftitem

public FTTokenizer ftitem

Current fulltext item.

ftpos

public FTPosFilter ftpos

Current fulltext position filter.

iu

public boolean iu

Flag for fulltext index use.

Constructor Detail

XPContext

public XPContext(Expr expr,
                 java.lang.String qu)

Constructor.

Parameters:

expr - root expression

qu - input query

Method Detail

compile

public XPContext compile(Nodes n)
                  throws QueryException

Description copied from class: QueryContext

Optimizes the expression.

Parameters:

n - node context

Returns:

query context

Throws:

QueryException - query exception

eval

public Result eval(Nodes nodes)
            throws QueryException

Description copied from class: QueryContext

Evaluates the expression with the specified context set.

Parameters:

nodes - initial context set

Returns:

resulting value

Throws:

QueryException - query exception

plan

public void plan(Serializer ser)
          throws java.lang.Exception

Description copied from class: QueryContext

Recursively serializes the query plan.

Parameters:

ser - serializer

Throws:

java.lang.Exception - exception

eval

public Item eval(Expr e)
          throws QueryException

Evaluates the expression with the specified context set. Additionally provides a context.

Parameters:

e - current expression

Returns:

resulting XPathValue

Throws:

QueryException - evaluation exception