net.sf.farrago.query
Class FarragoJavaUdxRule

java.lang.Object
  extended by org.eigenbase.relopt.RelOptRule
      extended by net.sf.farrago.query.FarragoJavaUdxRule

public class FarragoJavaUdxRule
extends RelOptRule

FarragoJavaUdxRule is a rule for transforming an abstract TableFunctionRel into a FarragoJavaUdxRel.

Version:
$Id: //open/dev/farrago/src/net/sf/farrago/query/FarragoJavaUdxRule.java#13 $
Author:
John V. Sichi

Field Summary
static FarragoJavaUdxRule instance
          The singleton instance.
 
Fields inherited from class org.eigenbase.relopt.RelOptRule
ANY, description, operands
 
Constructor Summary
FarragoJavaUdxRule()
          Creates a new FarragoJavaUdxRule object.
 
Method Summary
 CallingConvention getOutConvention()
          Returns the calling convention of the result of firing this rule, null if not known.
 void onMatch(RelOptRuleCall call)
          Receives notification about a rule match.
 
Methods inherited from class org.eigenbase.relopt.RelOptRule
convert, equals, equals, getOperand, getOperands, getOutTrait, hashCode, matches, mergeTraitsAndConvert, mergeTraitsAndConvert, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

instance

public static final FarragoJavaUdxRule instance
The singleton instance.

Constructor Detail

FarragoJavaUdxRule

public FarragoJavaUdxRule()
Creates a new FarragoJavaUdxRule object.

Method Detail

getOutConvention

public CallingConvention getOutConvention()
Description copied from class: RelOptRule
Returns the calling convention of the result of firing this rule, null if not known.

Overrides:
getOutConvention in class RelOptRule

onMatch

public void onMatch(RelOptRuleCall call)
Description copied from class: RelOptRule
Receives notification about a rule match. At the time that this method is called, call.rels holds the set of relational expressions which match the operands to the rule; call.rels[0] is the root expression.

Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back RelOptRuleCall.transformTo(org.eigenbase.rel.RelNode) to register the expression.

Specified by:
onMatch in class RelOptRule
Parameters:
call - Rule call
See Also:
RelOptRule.matches(RelOptRuleCall)