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 2005-07, ISC License, Tim Petrowsky

Field Summary

FTOption	ftoption Leaf flag.
boolean	leaf Leaf flag.
NodeSet	local Data reference.

Constructor Summary

XPContext(Expr expr)
Constructor.

Method Summary

void	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.

Methods inherited from class org.basex.query.QueryContext

compInfo, det, evalInfo, head, info, prog

Methods inherited from class org.basex.core.Progress

detail, header, progress, progress, stop, stopped

Methods inherited from class java.lang.Object

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

Field Detail

ftoption

public FTOption ftoption

Leaf flag.

leaf

public boolean leaf

Leaf flag.

local

public NodeSet local

Data reference.

Constructor Detail

XPContext

public XPContext(Expr expr)

Constructor.

Parameters:

expr - root expression

Method Detail

compile

public void compile(Nodes n)
             throws EvalException

Description copied from class: QueryContext

Optimizes the expression.

Specified by:

compile in class QueryContext

Parameters:

n - node context

Throws:

EvalException - evaluation exception

eval

public Item eval(Expr e)
          throws EvalException

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

Parameters:

e - current expression

Returns:

resulting XPathValue

Throws:

EvalException - evaluation exception

eval

public Result eval(Nodes nodes)
            throws EvalException

Description copied from class: QueryContext

Evaluates the expression with the specified context set.

Specified by:

eval in class QueryContext

Parameters:

nodes - initial context set

Returns:

resulting value

Throws:

EvalException - evaluation exception