org.basex.query.expr
Class CPI

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.expr.Expr
          org.basex.query.expr.Arr
              org.basex.query.expr.CFrag
                  org.basex.query.expr.CPI

public final class CPI
extends CFrag

PI fragment.

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Nested Class Summary

Nested classes/interfaces inherited from class org.basex.query.expr.Expr

Expr.Use

Field Summary

Fields inherited from class org.basex.query.expr.Arr

expr

Constructor Summary

CPI(Expr n, Expr v)
Constructor.

Method Summary

FPI	atomic(QueryContext ctx) Evaluates the expression and returns the resulting item or a null reference.
static byte[]	check(byte[] atom) Checks the specified token for validity.
Expr	comp(QueryContext ctx) Optimizes and compiles the expression.
String	info() Returns a string description of the expression.
String	toString()

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

returned, uses

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

duplicates, indexEquivalent, plan, removable, remove

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

addText, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, iter, sameAs, size, test, v

Methods inherited from class org.basex.query.ExprInfo

color, name

Methods inherited from class java.lang.Object

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

Constructor Detail

CPI

public CPI(Expr n,
           Expr v)

Constructor.

Parameters:

n - name

v - value

Method Detail

comp

public Expr comp(QueryContext ctx)
          throws QueryException

Description copied from class: Expr

Optimizes and compiles the expression.

Overrides:

comp in class Arr

Parameters:

ctx - query context

Returns:

optimized Expression

Throws:

QueryException - query exception

atomic

public FPI atomic(QueryContext ctx)
           throws QueryException

Description copied from class: Expr

Evaluates the expression and returns the resulting item or a null reference. If this method is not overwritten, Expr.iter(org.basex.query.QueryContext) must be implemented.

Specified by:

atomic in class CFrag

Parameters:

ctx - query context

Returns:

iterator

Throws:

QueryException - query exception

check

public static byte[] check(byte[] atom)
                    throws QueryException

Checks the specified token for validity.

Parameters:

atom - token to be checked

Returns:

token

Throws:

QueryException - query exception

info

public String info()

Description copied from class: ExprInfo

Returns a string description of the expression. Contrary to the ExprInfo.toString() method, arguments are not included in the output.

Overrides:

info in class ExprInfo

Returns:

result of check

toString

public String toString()

Specified by:

toString in class ExprInfo