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/*
* Copyright 2016 Goldman Sachs.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package com.gs.dmn.validation;
import com.gs.dmn.DMNModelRepository;
import com.gs.dmn.ast.TDRGElement;
import com.gs.dmn.ast.TDecisionTable;
import com.gs.dmn.ast.TDefinitions;
import com.gs.dmn.context.DMNContext;
import com.gs.dmn.dialect.DMNDialectDefinition;
import com.gs.dmn.el.analysis.semantics.type.Type;
import com.gs.dmn.el.synthesis.ELTranslator;
import com.gs.dmn.log.BuildLogger;
import com.gs.dmn.log.Slf4jBuildLogger;
import com.gs.dmn.validation.table.Bound;
import com.gs.dmn.validation.table.RuleGroup;
import com.gs.dmn.validation.table.Table;
import org.apache.commons.lang3.StringUtils;
import java.util.*;
public class SweepRuleOverlapValidator extends SweepValidator {
public SweepRuleOverlapValidator() {
this(new Slf4jBuildLogger(LOGGER));
}
public SweepRuleOverlapValidator(BuildLogger logger) {
super(logger);
}
public SweepRuleOverlapValidator(DMNDialectDefinition dmnDialectDefinition) {
super(dmnDialectDefinition);
}
@Override
protected void validate(TDRGElement element, TDecisionTable decisionTable, SweepValidationContext context) {
if (element != null) {
logger.debug(String.format("Validating element '%s'", element.getName()));
// Find the overlapping rules
DMNModelRepository repository = context.getRepository();
ELTranslator feelTranslator = context.getElTranslator();
List ruleIndexList = new ArrayList<>();
int totalNumberOfRules = decisionTable.getRule().size();
for (int i = 0; i< totalNumberOfRules; i++) {
ruleIndexList.add(i);
}
int totalNumberOfColumns = decisionTable.getInput().size();
Table table = this.factory.makeTable(totalNumberOfRules, totalNumberOfColumns, repository, element, decisionTable, feelTranslator);
logger.debug(String.format("Table '%s'", table));
ArrayList overlappingRules = new ArrayList<>();
if (!table.isEmpty()) {
findOverlappingRules(ruleIndexList, 0, totalNumberOfColumns, overlappingRules, table);
}
logger.debug(String.format("Overlapping rules '%s'", overlappingRules));
// Overlap graph
Map> neighbor = new LinkedHashMap<>();
for (RuleGroup ruleGroup: overlappingRules) {
List ruleIndexes = ruleGroup.getRuleIndexes();
int size = ruleIndexes.size();
if (size > 1) {
for (int i = 0; i n1Neighbor = neighbor.computeIfAbsent(n1, k -> new LinkedHashSet<>());
for (int j=i+1; j n2Neighbor = neighbor.computeIfAbsent(n2, k -> new LinkedHashSet<>());
n1Neighbor.add(n2);
n2Neighbor.add(n1);
}
}
}
}
logger.debug(String.format("Overlap graph '%s'", neighbor));
// Generate the maximal cliques of the overlap graph - Bron-Kerbosch
List maxCliques = new ArrayList<>();
maxCliquesBronKerbosch(new RuleGroup(), new RuleGroup(ruleIndexList), new RuleGroup(), neighbor, maxCliques);
logger.debug(String.format("Max cliques '%s'", maxCliques));
// Make errors
maxCliques.sort(RuleGroup.COMPARATOR);
for (RuleGroup ruleGroup: maxCliques) {
String error = makeError(element, ruleGroup, repository);
context.addError(error);
}
}
}
private String makeError(TDRGElement element, RuleGroup group, DMNModelRepository repository) {
TDefinitions model = repository.getModel(element);
String message = String.format("Decision table rules '%s' overlap in decision '%s'", group.serialize(), repository.displayName(element));
return makeError(repository, model, element, message);
}
// From "Semantics and Analysis of DMN Decision Tables.pdf"
// Algorithm: findOverlappingRules
// Input: ruleList; i; N; overlappingRuleList.
// 1. ruleList, containing all rules of the input DMN table;
// 2. i, containing the index of the column under scrutiny;
// 3. N, representing the total number of columns;
// 4. OverlappingRuleList, storing the rules that overlap.
// if i == N then
// define current overlap currentOverlapRules; /* it contains the list of rules that overlap up to the current point */ ;
// if !overlappingRuleList.includes(currentOverlapRules) then
// overlappingRuleList.put(currentOverlapRules);
// else
// define the current list of bounds Lxi ;
// sortedListAllBounds = ruleList.sort(i);
// foreach currentBound in sortedListAllBoundaries do
// if !currentBound.isLower() then
// findOverlappingRules(Lxi, i + 1, N, overlappingRuleList); /* recursive call */
// Lxi.delete(currentBound);
// else
// Lxi.put(currentBound);
// return overlappingRuleList;
private List findOverlappingRules(List ruleList, int columnIndex, int inputColumnCount, List overlappingRuleList, Table table) {
String indent = StringUtils.repeat("\t", columnIndex);
logger.debug(String.format("%sfindOverlappingRules column = '%s' active rules '%s' overlapping rules '%s'", indent, columnIndex, ruleList, overlappingRuleList));
if(columnIndex == inputColumnCount) {
RuleGroup group = new RuleGroup(new ArrayList<>(ruleList));
addGroup(overlappingRuleList, group);
} else {
// Define the current list of bounds lxi
List lxi = new ArrayList<>();
// Project rules on column columnIndex
List sortedListAllBounds = makeBoundList(ruleList, columnIndex, table);
for (Bound currentBound : sortedListAllBounds) {
logger.debug(String.format("%sCurrent bound = '%s' active rules %s", indent, currentBound, lxi));
int ruleIndex = currentBound.getInterval().getRuleIndex();
if (!currentBound.isLowerBound()) {
List overlappingRules = findOverlappingRules(lxi, columnIndex + 1, inputColumnCount, overlappingRuleList, table);
logger.debug(String.format("%sRemove active rule %s", indent, ruleIndex));
lxi.remove((Object) ruleIndex);
for (RuleGroup group : overlappingRules) {
addGroup(overlappingRuleList, group);
}
} else {
logger.debug(String.format("%sAdd active rule %s", indent, ruleIndex));
lxi.add(ruleIndex);
}
}
}
return overlappingRuleList;
}
private void addGroup(List rules, RuleGroup group) {
if (group != null && group.getRuleIndexes().size() > 1) {
if (!rules.contains(group)) {
rules.add(group);
}
}
}
// https://en.wikipedia.org/wiki/Bron%E2%80%93Kerbosch_algorithm
// algorithm BronKerbosch2(R, P, X) is
// if P and X are both empty then
// report R as a maximal clique
// choose a pivot vertex u in P ⋃ X
// for each vertex v in P \ N(u) do
// BronKerbosch2(R ⋃ {v}, P ⋂ N(v), X ⋂ N(v))
// P := P \ {v}
// X := X ⋃ {v}
protected void maxCliquesBronKerbosch(RuleGroup r, RuleGroup p, RuleGroup x, Map> neighbor, List maxCliques) {
if (p.isEmpty() && x.isEmpty()) {
if (r.getRuleIndexes().size() > 1) {
maxCliques.add(r.sort());
}
} else {
int u = choosePivot(p, x, neighbor);
if (u != -1) {
Set uNeighbor = neighbor.get(u);
List ruleIndexes = p.minus(uNeighbor).getRuleIndexes();
for (int v: ruleIndexes) {
Set vNeighbor = neighbor.get(v);
maxCliquesBronKerbosch(r.union(v), p.intersect(vNeighbor), x.intersect(vNeighbor), neighbor, maxCliques);
p = p.minus(v);
x = x.union(v);
}
}
}
}
private int choosePivot(RuleGroup p, RuleGroup x, Map> neighbor) {
int max = -1;
int u = -1;
for (int i: p.getRuleIndexes()) {
Set nodes = neighbor.get(i);
if (nodes != null) {
int size = nodes.size();
if (size > max) {
u = i;
max = size;
}
}
}
for (int i: x.getRuleIndexes()) {
Set nodes = neighbor.get(i);
if (nodes != null) {
int size = nodes.size();
if (size > max) {
u = i;
max = size;
}
}
}
return u;
}
}
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