PredicateDrivenCostEstimator (Ontopia)

java.lang.Object
- net.ontopia.topicmaps.query.impl.utils.CostEstimator
- - net.ontopia.topicmaps.query.impl.utils.PredicateDrivenCostEstimator

public class PredicateDrivenCostEstimator
extends CostEstimator

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`BIG_RESULT`
`static int`	`FAIL_RESULT`
`static int`	`FILTER_RESULT`
`static int`	`INFINITE_RESULT`
`static int`	`MEDIUM_RESULT`
`static int`	`SINGLE_RESULT`
`static int`	`SMALL_RESULT`
`static int`	`WHOLE_TM_RESULT`

Constructor Summary

Constructors
Constructor Description

PredicateDrivenCostEstimator()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`computeCost(Set context, AbstractClause clause, Set literalvars, String rulename)`	INTERNAL: Computes the cost of evaluating the given clause in the given context of variable bindings.
`static int`	`getComparisonPredicateCost(boolean[] boundparams)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - INFINITE_RESULT
```
public static int INFINITE_RESULT
```
  - WHOLE_TM_RESULT
```
public static int WHOLE_TM_RESULT
```
  - BIG_RESULT
```
public static int BIG_RESULT
```
  - MEDIUM_RESULT
```
public static int MEDIUM_RESULT
```
  - SMALL_RESULT
```
public static int SMALL_RESULT
```
  - SINGLE_RESULT
```
public static int SINGLE_RESULT
```
  - FILTER_RESULT
```
public static int FILTER_RESULT
```
  - FAIL_RESULT
```
public static int FAIL_RESULT
```
- Constructor Detail
  - PredicateDrivenCostEstimator
```
public PredicateDrivenCostEstimator()
```
- Method Detail
  - computeCost
```
public int computeCost(Set context,
                       AbstractClause clause,
                       Set literalvars,
                       String rulename)
```
    INTERNAL: Computes the cost of evaluating the given clause in the given context of variable bindings. The cost largely depends on the number of unbound variables in the clause.
    
    Specified by:
    
    computeCost in class CostEstimator
    
    Parameters:
    
    context - A set of bound variables.
    
    clause - The clause whose cost we want to compute.
    
    literalvars - Contains the variables representing literals. Only an issue in rules.
    
    rulename - The name of the current rule (so we can delay recursive evaluation).
  - getComparisonPredicateCost
```
public static int getComparisonPredicateCost(boolean[] boundparams)
```