saffron.opt
Class RuleMatch

java.lang.Object
  |
  +--saffron.opt.RuleCall
        |
        +--saffron.opt.RuleMatch

class RuleMatch

extends RuleCall

A match of a rule to a particular set of target relational expressions, frozen in time.

Since:

Jun 14, 2003

Version:

$Id: //open/saffron/src/main/saffron/opt/RuleMatch.java#1 $

Author:

jhyde

Field Summary

private String	digest
(package private) RelSet	targetSet
(package private) RelSubset	targetSubset

Fields inherited from class saffron.opt.RuleCall

operand0, rels, rule

Constructor Summary

(package private)

RuleMatch(Operand operand0, Rel[] rels) Creates a RuleMatch.

Method Summary

private String	computeDigest()
(package private) double	computeImportance()
private RelSubset	guessSubset()
String	toString()

Methods inherited from class saffron.opt.RuleCall

getPlanner, getRule, match, onMatch, transformTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

targetSet

final RelSet targetSet

targetSubset

RelSubset targetSubset

digest

private final String digest

Constructor Detail

RuleMatch

RuleMatch(Operand operand0,
          Rel[] rels)

Creates a RuleMatch.

Parameters:

operand0 - Primary operand

rels - List of targets; copied by the constructor, so the client can modify it later

Pre-condition:

rels[i] != null

Method Detail

toString

public String toString()

Overrides:

toString in class Object

computeDigest

private String computeDigest()

guessSubset

private RelSubset guessSubset()

computeImportance

double computeImportance()