blob: 338990ab0110d14945c2de0d1e984cd66f180372 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*******************************************************************************
* Copyright (c) 2010-2018, Gabor Bergmann, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.util;
/**
* The degree of accuracy of a cardinality estimate
* @author Gabor Bergmann
* @since 2.1
*/
public enum Accuracy {
EXACT_COUNT,
BEST_UPPER_BOUND,
BEST_LOWER_BOUND,
APPROXIMATION;
/**
* Partial order comparison.
*/
public boolean atLeastAsPreciseAs(Accuracy other) {
switch (this) {
case EXACT_COUNT: return true;
case APPROXIMATION: return APPROXIMATION == other;
case BEST_UPPER_BOUND: return BEST_UPPER_BOUND == other || APPROXIMATION == other;
case BEST_LOWER_BOUND: return BEST_LOWER_BOUND == other || APPROXIMATION == other;
default: throw new IllegalArgumentException();
}
}
/**
* @return another accuracy value that is anti-monotonic to this one,
* i.e. an accuracy that should be used in the denominator to obtain a fraction with this accuracy
*/
public Accuracy reciprocal() {
switch(this) {
case APPROXIMATION: return APPROXIMATION;
case BEST_UPPER_BOUND: return BEST_LOWER_BOUND;
case BEST_LOWER_BOUND: return BEST_UPPER_BOUND;
case EXACT_COUNT: return EXACT_COUNT;
default: throw new IllegalArgumentException();
}
}
}
|
