org.basex.query.xquery.expr
Class CmpG

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.xquery.expr.Expr
          org.basex.query.xquery.expr.Arr
              org.basex.query.xquery.expr.CmpG

public final class CmpG
extends Arr

General comparison.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen

Nested Class Summary

static class

CmpG.Comp Comparators.

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

Expr.Return, Expr.Using

Field Summary

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

expr

Constructor Summary

CmpG(Expr e1, Expr e2, CmpG.Comp c)
Constructor.

Method Summary

Expr	comp(XQContext ctx) Optimizes and compiles the expression.
java.lang.String	info() Returns a string description of the expression.
Iter	iter(XQContext ctx) Evaluates the expression and returns an iterator on the resulting items.
void	plan(Serializer ser) Recursively sends the abstract syntax of this expression to the specified serializer.
Type	returned() Indicates if an expression returns the specified type.
java.lang.String	toString()

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

uses

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

e, i

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

CmpG

public CmpG(Expr e1,
            Expr e2,
            CmpG.Comp c)

Constructor.

Parameters:

e1 - first expression

e2 - second expression

c - comparator

Method Detail

comp

public Expr comp(XQContext ctx)
          throws XQException

Description copied from class: Expr

Optimizes and compiles the expression.

Overrides:

comp in class Arr

Parameters:

ctx - query context

Returns:

optimized Expression

Throws:

XQException - evaluation exception

iter

public Iter iter(XQContext ctx)

Description copied from class: Expr

Evaluates the expression and returns an iterator on the resulting items.

Specified by:

iter in class Expr

Parameters:

ctx - query context

Returns:

resulting item

returned

public Type returned()

Description copied from class: Expr

Indicates if an expression returns the specified type. Called by the compiler to check if expressions can be reformulated. null is returned by default.

Overrides:

returned in class Arr

Returns:

result of check

info

public java.lang.String info()

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:

info in class ExprInfo

Returns:

result of check

plan

public void plan(Serializer ser)
          throws java.io.IOException

Description copied from class: ExprInfo

Recursively sends the abstract syntax of this expression to the specified serializer.

Overrides:

plan in class Arr

Parameters:

ser - serializer

Throws:

java.io.IOException - exception

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo