org.optaplanner.constraint.streams.drools.common.BiLeftHandSide Maven / Gradle / Ivy
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package org.optaplanner.constraint.streams.drools.common;
import static java.util.Collections.singletonList;
import static org.drools.model.DSL.exists;
import static org.drools.model.DSL.not;
import static org.drools.model.PatternDSL.betaIndexedBy;
import static org.drools.model.PatternDSL.pattern;
import java.math.BigDecimal;
import java.util.List;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.Predicate;
import java.util.function.ToIntBiFunction;
import java.util.function.ToLongBiFunction;
import java.util.stream.Stream;
import org.drools.model.BetaIndex2;
import org.drools.model.DSL;
import org.drools.model.PatternDSL;
import org.drools.model.Variable;
import org.drools.model.functions.Function2;
import org.drools.model.functions.Predicate3;
import org.drools.model.functions.accumulate.AccumulateFunction;
import org.drools.model.view.ViewItem;
import org.optaplanner.constraint.streams.common.tri.DefaultTriJoiner;
import org.optaplanner.constraint.streams.common.tri.FilteringTriJoiner;
import org.optaplanner.constraint.streams.drools.DroolsVariableFactory;
import org.optaplanner.core.api.function.TriPredicate;
import org.optaplanner.core.api.score.stream.bi.BiConstraintCollector;
import org.optaplanner.core.api.score.stream.tri.TriJoiner;
import org.optaplanner.core.impl.score.stream.JoinerType;
/**
* Represents the left hand side of a Drools rule, the result of which are two variables.
* The simplest variant of such rule, with no filters or groupBys applied, would look like this in equivalent DRL:
*
*
* {@code
* rule "Simplest bivariate rule"
* when
* $a: Something()
* $b: SomethingElse()
* then
* // Do something with the $a and $b variables.
* end
* }
*
*
* Usually though, there would be a joiner between the two, limiting the cartesian product:
*
*
* {@code
* rule "Bivariate join rule"
* when
* $a: Something($leftJoin: someValue)
* $b: SomethingElse(someOtherValue == $leftJoin)
* then
* // Do something with the $a and $b variables.
* end
* }
*
*
* For more, see {@link UniLeftHandSide}.
*
* @param generic type of the first resulting variable
* @param generic type of the second resulting variable
*/
public final class BiLeftHandSide extends AbstractLeftHandSide {
private final PatternVariable patternVariableA;
private final PatternVariable patternVariableB;
private final BiRuleContext ruleContext;
BiLeftHandSide(Variable left, PatternVariable right, DroolsVariableFactory variableFactory) {
this(new DetachedPatternVariable<>(left), right, variableFactory);
}
BiLeftHandSide(PatternVariable left, PatternVariable right,
DroolsVariableFactory variableFactory) {
super(variableFactory);
this.patternVariableA = Objects.requireNonNull(left);
this.patternVariableB = Objects.requireNonNull(right);
this.ruleContext = buildRuleContext();
}
private BiRuleContext buildRuleContext() {
ViewItem[] viewItems = Stream.of(patternVariableA, patternVariableB)
.flatMap(variable -> variable.build().stream())
.toArray((IntFunction[]>) ViewItem[]::new);
return new BiRuleContext<>(patternVariableA.getPrimaryVariable(), patternVariableB.getPrimaryVariable(),
viewItems);
}
public BiLeftHandSide andFilter(BiPredicate predicate) {
return new BiLeftHandSide<>(patternVariableA,
patternVariableB.filter(predicate, patternVariableA.getPrimaryVariable()), variableFactory);
}
private BiLeftHandSide applyJoiners(Class otherFactType, Predicate nullityFilter,
DefaultTriJoiner joiner, TriPredicate predicate, boolean shouldExist) {
Variable toExist = variableFactory.createVariable(otherFactType, "toExist");
PatternDSL.PatternDef existencePattern = pattern(toExist);
if (nullityFilter != null) {
existencePattern = existencePattern.expr("Exclude nulls using " + nullityFilter,
nullityFilter::test);
}
if (joiner == null) {
return applyFilters(existencePattern, predicate, shouldExist);
}
int joinerCount = joiner.getJoinerCount();
for (int mappingIndex = 0; mappingIndex < joinerCount; mappingIndex++) {
JoinerType joinerType = joiner.getJoinerType(mappingIndex);
BiFunction leftMapping = joiner.getLeftMapping(mappingIndex);
Function rightMapping = joiner.getRightMapping(mappingIndex);
Predicate3 joinPredicate =
(c, a, b) -> joinerType.matches(leftMapping.apply(a, b), rightMapping.apply(c));
existencePattern = existencePattern.expr("Join using joiner #" + mappingIndex + " in " + joiner,
patternVariableA.getPrimaryVariable(), patternVariableB.getPrimaryVariable(), joinPredicate,
createBetaIndex(joiner, mappingIndex));
}
return applyFilters(existencePattern, predicate, shouldExist);
}
private BetaIndex2 createBetaIndex(DefaultTriJoiner joiner, int mappingIndex) {
JoinerType joinerType = joiner.getJoinerType(mappingIndex);
BiFunction leftMapping = joiner.getLeftMapping(mappingIndex);
Function rightMapping = joiner.getRightMapping(mappingIndex);
if (joinerType == JoinerType.EQUAL) {
return betaIndexedBy(Object.class, getConstraintType(joinerType), mappingIndex, rightMapping::apply,
leftMapping::apply, Object.class);
} else { // Drools beta index on LT/LTE/GT/GTE requires Comparable.
JoinerType reversedJoinerType = joinerType.flip();
return betaIndexedBy(Comparable.class, getConstraintType(reversedJoinerType), mappingIndex,
c -> (Comparable) rightMapping.apply(c), leftMapping::apply, Comparable.class);
}
}
private BiLeftHandSide applyFilters(PatternDSL.PatternDef existencePattern, TriPredicate predicate,
boolean shouldExist) {
PatternDSL.PatternDef possiblyFilteredExistencePattern = predicate == null ? existencePattern
: existencePattern.expr("Filter using " + predicate, patternVariableA.getPrimaryVariable(),
patternVariableB.getPrimaryVariable(), (c, a, b) -> predicate.test(a, b, c));
ViewItem existenceExpression = exists(possiblyFilteredExistencePattern);
if (!shouldExist) {
existenceExpression = not(possiblyFilteredExistencePattern);
}
return new BiLeftHandSide<>(patternVariableA, patternVariableB.addDependentExpression(existenceExpression),
variableFactory);
}
private BiLeftHandSide existsOrNot(Class cClass, TriJoiner[] joiners,
Predicate nullityFilter, boolean shouldExist) {
int indexOfFirstFilter = -1;
// Prepare the joiner and filter that will be used in the pattern
DefaultTriJoiner finalJoiner = null;
TriPredicate finalFilter = null;
for (int i = 0; i < joiners.length; i++) {
TriJoiner joiner = joiners[i];
boolean hasAFilter = indexOfFirstFilter >= 0;
if (joiner instanceof FilteringTriJoiner) {
if (!hasAFilter) { // From now on, we only allow filtering joiners.
indexOfFirstFilter = i;
}
// Merge all filters into one to avoid paying the penalty for lack of indexing more than once.
FilteringTriJoiner castJoiner = (FilteringTriJoiner) joiner;
finalFilter = finalFilter == null ? castJoiner.getFilter() : finalFilter.and(castJoiner.getFilter());
} else {
if (hasAFilter) {
throw new IllegalStateException("Indexing joiner (" + joiner + ") must not follow a filtering joiner ("
+ joiners[indexOfFirstFilter] + ").");
} else { // Merge this Joiner with the existing Joiners.
DefaultTriJoiner castJoiner = (DefaultTriJoiner) joiner;
finalJoiner = finalJoiner == null ? castJoiner : finalJoiner.and(castJoiner);
}
}
}
return applyJoiners(cClass, nullityFilter, finalJoiner, finalFilter, shouldExist);
}
public BiLeftHandSide andExists(Class cClass, TriJoiner[] joiners, Predicate nullityFilter) {
return existsOrNot(cClass, joiners, nullityFilter, true);
}
public BiLeftHandSide andNotExists(Class cClass, TriJoiner[] joiners, Predicate nullityFilter) {
return existsOrNot(cClass, joiners, nullityFilter, false);
}
public TriLeftHandSide andJoin(UniLeftHandSide right, TriJoiner joiner) {
DefaultTriJoiner castJoiner = (DefaultTriJoiner) joiner;
PatternVariable newRight = right.getPatternVariableA();
int joinerCount = castJoiner.getJoinerCount();
for (int mappingIndex = 0; mappingIndex < joinerCount; mappingIndex++) {
JoinerType joinerType = castJoiner.getJoinerType(mappingIndex);
newRight = newRight.filterForJoin(patternVariableA.getPrimaryVariable(),
patternVariableB.getPrimaryVariable(), castJoiner, joinerType, mappingIndex);
}
return new TriLeftHandSide<>(patternVariableA, patternVariableB, newRight, variableFactory);
}
public UniLeftHandSide andGroupBy(BiConstraintCollector collector) {
Variable accumulateOutput = variableFactory.createVariable("collected");
ViewItem innerAccumulatePattern = joinViewItemsWithLogicalAnd(patternVariableA, patternVariableB);
ViewItem outerAccumulatePattern = buildAccumulate(innerAccumulatePattern,
createAccumulateFunction(collector, accumulateOutput));
return new UniLeftHandSide<>(accumulateOutput, singletonList(outerAccumulatePattern), variableFactory);
}
public BiLeftHandSide andGroupBy(BiConstraintCollector collectorA,
BiConstraintCollector collectorB) {
Variable accumulateOutputA = variableFactory.createVariable("collectedA");
Variable accumulateOutputB = variableFactory.createVariable("collectedB");
ViewItem innerAccumulatePattern = joinViewItemsWithLogicalAnd(patternVariableA, patternVariableB);
ViewItem outerAccumulatePattern = buildAccumulate(innerAccumulatePattern,
createAccumulateFunction(collectorA, accumulateOutputA),
createAccumulateFunction(collectorB, accumulateOutputB));
return new BiLeftHandSide<>(accumulateOutputA,
new DirectPatternVariable<>(accumulateOutputB, outerAccumulatePattern), variableFactory);
}
public TriLeftHandSide andGroupBy(
BiConstraintCollector collectorA, BiConstraintCollector collectorB,
BiConstraintCollector collectorC) {
Variable accumulateOutputA = variableFactory.createVariable("collectedA");
Variable accumulateOutputB = variableFactory.createVariable("collectedB");
Variable accumulateOutputC = variableFactory.createVariable("collectedC");
ViewItem innerAccumulatePattern = joinViewItemsWithLogicalAnd(patternVariableA, patternVariableB);
ViewItem outerAccumulatePattern = buildAccumulate(innerAccumulatePattern,
createAccumulateFunction(collectorA, accumulateOutputA),
createAccumulateFunction(collectorB, accumulateOutputB),
createAccumulateFunction(collectorC, accumulateOutputC));
return new TriLeftHandSide<>(accumulateOutputA, accumulateOutputB,
new DirectPatternVariable<>(accumulateOutputC, outerAccumulatePattern),
variableFactory);
}
public QuadLeftHandSide andGroupBy(
BiConstraintCollector collectorA, BiConstraintCollector collectorB,
BiConstraintCollector collectorC, BiConstraintCollector collectorD) {
Variable accumulateOutputA = variableFactory.createVariable("collectedA");
Variable accumulateOutputB = variableFactory.createVariable("collectedB");
Variable accumulateOutputC = variableFactory.createVariable("collectedC");
Variable accumulateOutputD = variableFactory.createVariable("collectedD");
ViewItem innerAccumulatePattern = joinViewItemsWithLogicalAnd(patternVariableA, patternVariableB);
ViewItem outerAccumulatePattern = buildAccumulate(innerAccumulatePattern,
createAccumulateFunction(collectorA, accumulateOutputA),
createAccumulateFunction(collectorB, accumulateOutputB),
createAccumulateFunction(collectorC, accumulateOutputC),
createAccumulateFunction(collectorD, accumulateOutputD));
return new QuadLeftHandSide<>(accumulateOutputA, accumulateOutputB, accumulateOutputC,
new DirectPatternVariable<>(accumulateOutputD, outerAccumulatePattern), variableFactory);
}
/**
* Creates a Drools accumulate function based on a given collector. The accumulate function will take the pattern
* variables as input and return its result into another {@link Variable}.
*
* @param type of the accumulate result
* @param collector collector to use in the accumulate function
* @param out variable in which to store accumulate result
* @return Drools accumulate function
*/
private AccumulateFunction createAccumulateFunction(BiConstraintCollector collector,
Variable out) {
Variable variableA = patternVariableA.getPrimaryVariable();
Variable variableB = patternVariableB.getPrimaryVariable();
return new AccumulateFunction(null, () -> new BiAccumulator<>(variableA, variableB, collector))
.with(variableA, variableB)
.as(out);
}
public UniLeftHandSide andGroupBy(BiFunction keyMapping) {
Variable groupKey = variableFactory.createVariable("groupKey");
ViewItem groupByPattern = buildGroupBy(groupKey, keyMapping::apply);
return new UniLeftHandSide<>(groupKey, singletonList(groupByPattern), variableFactory);
}
public BiLeftHandSide andGroupBy(BiFunction keyMappingA,
BiConstraintCollector collectorB) {
Variable groupKey = variableFactory.createVariable("groupKey");
Variable accumulateOutput = variableFactory.createVariable("output");
ViewItem groupByPattern = buildGroupBy(groupKey, keyMappingA::apply,
createAccumulateFunction(collectorB, accumulateOutput));
return new BiLeftHandSide<>(groupKey,
new DirectPatternVariable<>(accumulateOutput, groupByPattern), variableFactory);
}
public TriLeftHandSide andGroupBy(BiFunction keyMappingA,
BiConstraintCollector collectorB, BiConstraintCollector collectorC) {
Variable groupKey = variableFactory.createVariable("groupKey");
Variable accumulateOutputB = variableFactory.createVariable("outputB");
Variable accumulateOutputC = variableFactory.createVariable("outputC");
ViewItem groupByPattern = buildGroupBy(groupKey, keyMappingA::apply,
createAccumulateFunction(collectorB, accumulateOutputB),
createAccumulateFunction(collectorC, accumulateOutputC));
return new TriLeftHandSide<>(groupKey, accumulateOutputB,
new DirectPatternVariable<>(accumulateOutputC, groupByPattern), variableFactory);
}
public QuadLeftHandSide andGroupBy(
BiFunction keyMappingA, BiConstraintCollector collectorB,
BiConstraintCollector collectorC, BiConstraintCollector collectorD) {
Variable groupKey = variableFactory.createVariable("groupKey");
Variable accumulateOutputB = variableFactory.createVariable("outputB");
Variable accumulateOutputC = variableFactory.createVariable("outputC");
Variable accumulateOutputD = variableFactory.createVariable("outputD");
ViewItem groupByPattern = buildGroupBy(groupKey, keyMappingA::apply,
createAccumulateFunction(collectorB, accumulateOutputB),
createAccumulateFunction(collectorC, accumulateOutputC),
createAccumulateFunction(collectorD, accumulateOutputD));
return new QuadLeftHandSide<>(groupKey, accumulateOutputB, accumulateOutputC,
new DirectPatternVariable<>(accumulateOutputD, groupByPattern), variableFactory);
}
/**
* Takes group key mappings and merges them in such a way that the result is a single composite key.
* This is necessary because Drools groupBy can only take a single key - therefore multiple variables need to be
* converted into a singular composite variable.
*
* @param keyMappingA mapping for the first variable
* @param keyMappingB mapping for the second variable
* @param generic type of the first variable
* @param generic type of the second variable
* @return never null, Drools function to convert the keys to a singular composite key
*/
private Function2> createCompositeBiGroupKey(
BiFunction keyMappingA, BiFunction keyMappingB) {
return (a, b) -> new BiTuple<>(keyMappingA.apply(a, b), keyMappingB.apply(a, b));
}
public BiLeftHandSide andGroupBy(BiFunction keyMappingA,
BiFunction keyMappingB) {
Variable> groupKey = variableFactory.createVariable(BiTuple.class, "groupKey");
ViewItem groupByPattern = buildGroupBy(groupKey, createCompositeBiGroupKey(keyMappingA, keyMappingB));
Variable newA = variableFactory.createVariable("newA");
Variable newB = variableFactory.createVariable("newB");
IndirectPatternVariable> bPatternVar =
decompose(groupKey, groupByPattern, newA, newB);
return new BiLeftHandSide<>(newA, bPatternVar, variableFactory);
}
public TriLeftHandSide andGroupBy(BiFunction keyMappingA,
BiFunction keyMappingB, BiConstraintCollector collectorC) {
Variable> groupKey = variableFactory.createVariable(BiTuple.class, "groupKey");
Variable accumulateOutput = variableFactory.createVariable("output");
ViewItem groupByPattern = buildGroupBy(groupKey,
createCompositeBiGroupKey(keyMappingA, keyMappingB),
createAccumulateFunction(collectorC, accumulateOutput));
Variable newA = variableFactory.createVariable("newA");
Variable newB = variableFactory.createVariable("newB");
DirectPatternVariable cPatternVar =
decomposeWithAccumulate(groupKey, groupByPattern, newA, newB, accumulateOutput);
return new TriLeftHandSide<>(newA, newB, cPatternVar, variableFactory);
}
public QuadLeftHandSide andGroupBy(BiFunction keyMappingA,
BiFunction keyMappingB, BiConstraintCollector collectorC,
BiConstraintCollector collectorD) {
Variable> groupKey = variableFactory.createVariable(BiTuple.class, "groupKey");
Variable accumulateOutputC = variableFactory.createVariable("outputC");
Variable accumulateOutputD = variableFactory.createVariable("outputD");
ViewItem groupByPattern = buildGroupBy(groupKey,
createCompositeBiGroupKey(keyMappingA, keyMappingB),
createAccumulateFunction(collectorC, accumulateOutputC),
createAccumulateFunction(collectorD, accumulateOutputD));
Variable newA = variableFactory.createVariable("newA");
Variable newB = variableFactory.createVariable("newB");
DirectPatternVariable dPatternVar =
decomposeWithAccumulate(groupKey, groupByPattern, newA, newB, accumulateOutputD);
return new QuadLeftHandSide<>(newA, newB, accumulateOutputC, dPatternVar, variableFactory);
}
/**
* Takes group key mappings and merges them in such a way that the result is a single composite key.
* This is necessary because Drools groupBy can only take a single key - therefore multiple variables need to be
* converted into a singular composite variable.
*
* @param keyMappingA mapping for the first variable
* @param keyMappingB mapping for the second variable
* @param keyMappingC mapping for the third variable
* @param generic type of the first variable
* @param generic type of the second variable
* @param generic type of the third variable
* @return never null, Drools function to convert the keys to a singular composite key
*/
private Function2> createCompositeTriGroupKey(
BiFunction keyMappingA, BiFunction keyMappingB,
BiFunction keyMappingC) {
return (a, b) -> new TriTuple<>(keyMappingA.apply(a, b), keyMappingB.apply(a, b), keyMappingC.apply(a, b));
}
public TriLeftHandSide andGroupBy(BiFunction keyMappingA,
BiFunction keyMappingB, BiFunction keyMappingC) {
Variable> groupKey = variableFactory.createVariable(TriTuple.class, "groupKey");
ViewItem groupByPattern = buildGroupBy(groupKey,
createCompositeTriGroupKey(keyMappingA, keyMappingB, keyMappingC));
Variable newA = variableFactory.createVariable("newA");
Variable newB = variableFactory.createVariable("newB");
Variable newC = variableFactory.createVariable("newC");
IndirectPatternVariable> cPatternVar =
decompose(groupKey, groupByPattern, newA, newB, newC);
return new TriLeftHandSide<>(newA, newB, cPatternVar, variableFactory);
}
public QuadLeftHandSide andGroupBy(
BiFunction keyMappingA, BiFunction keyMappingB,
BiFunction keyMappingC, BiConstraintCollector collectorD) {
Variable> groupKey = variableFactory.createVariable(TriTuple.class, "groupKey");
Variable accumulateOutputD = variableFactory.createVariable("outputD");
ViewItem groupByPattern = buildGroupBy(groupKey,
createCompositeTriGroupKey(keyMappingA, keyMappingB, keyMappingC),
createAccumulateFunction(collectorD, accumulateOutputD));
Variable newA = variableFactory.createVariable("newA");
Variable newB = variableFactory.createVariable("newB");
Variable newC = variableFactory.createVariable("newC");
DirectPatternVariable dPatternVar =
decomposeWithAccumulate(groupKey, groupByPattern, newA, newB, newC, accumulateOutputD);
return new QuadLeftHandSide<>(newA, newB, newC, dPatternVar, variableFactory);
}
/**
* Takes group key mappings and merges them in such a way that the result is a single composite key.
* This is necessary because Drools groupBy can only take a single key - therefore multiple variables need to be
* converted into a singular composite variable.
*
* @param keyMappingA mapping for the first variable
* @param keyMappingB mapping for the second variable
* @param keyMappingC mapping for the third variable
* @param generic type of the first variable
* @param generic type of the second variable
* @param generic type of the third variable
* @return never null, Drools function to convert the keys to a singular composite key
*/
private Function2>
createCompositeQuadGroupKey(BiFunction keyMappingA, BiFunction keyMappingB,
BiFunction keyMappingC, BiFunction keyMappingD) {
return (a, b) -> new QuadTuple<>(keyMappingA.apply(a, b), keyMappingB.apply(a, b), keyMappingC.apply(a, b),
keyMappingD.apply(a, b));
}
public QuadLeftHandSide andGroupBy(
BiFunction keyMappingA, BiFunction keyMappingB, BiFunction keyMappingC,
BiFunction keyMappingD) {
Variable> groupKey = variableFactory.createVariable(QuadTuple.class, "groupKey");
ViewItem groupByPattern = buildGroupBy(groupKey,
createCompositeQuadGroupKey(keyMappingA, keyMappingB, keyMappingC, keyMappingD));
Variable newA = variableFactory.createVariable("newA");
Variable newB = variableFactory.createVariable("newB");
Variable newC = variableFactory.createVariable("newC");
Variable newD = variableFactory.createVariable("newD");
IndirectPatternVariable> dPatternVar =
decompose(groupKey, groupByPattern, newA, newB, newC, newD);
return new QuadLeftHandSide<>(newA, newB, newC, dPatternVar, variableFactory);
}
public UniLeftHandSide andMap(BiFunction mapping) {
Variable newA = variableFactory.createVariable("mapped", patternVariableA.getPrimaryVariable(),
patternVariableB.getPrimaryVariable(), mapping);
List> allPrerequisites = mergeViewItems(patternVariableA, patternVariableB);
DirectPatternVariable newPatternVariableA = new DirectPatternVariable<>(newA, allPrerequisites);
return new UniLeftHandSide<>(newPatternVariableA, variableFactory);
}
public BiLeftHandSide andFlattenLast(Function> mapping) {
Variable source = patternVariableB.getPrimaryVariable();
Variable newB = variableFactory.createFlattenedVariable("flattened", source, mapping);
List> allPrerequisites = mergeViewItems(patternVariableA, patternVariableB);
PatternVariable newPatternVariableB = new DirectPatternVariable<>(newB, allPrerequisites);
return new BiLeftHandSide<>(patternVariableA.getPrimaryVariable(), newPatternVariableB, variableFactory);
}
public RuleBuilder andTerminate(ToIntBiFunction matchWeigher) {
return ruleContext.newRuleBuilder(matchWeigher);
}
public RuleBuilder andTerminate(ToLongBiFunction matchWeigher) {
return ruleContext.newRuleBuilder(matchWeigher);
}
public RuleBuilder andTerminate(BiFunction matchWeigher) {
return ruleContext.newRuleBuilder(matchWeigher);
}
private ViewItem buildGroupBy(Variable groupKey,
Function2 groupKeyExtractor, AccumulateFunction... accFunctions) {
Variable inputA = patternVariableA.getPrimaryVariable();
Variable inputB = patternVariableB.getPrimaryVariable();
ViewItem innerGroupByPattern = joinViewItemsWithLogicalAnd(patternVariableA, patternVariableB);
return DSL.groupBy(innerGroupByPattern, inputA, inputB, groupKey, groupKeyExtractor, accFunctions);
}
}
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