org.basex.query.xquery.expr
Class CmpG

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