1 files changed, 57 insertions, 0 deletions

diff --git a/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/crossreference/CrossReferenceUtils.java b/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/crossreference/CrossReferenceUtils.java
new file mode 100644
index 00000000..c4a2f2b3
--- /dev/null
+++ b/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/crossreference/CrossReferenceUtils.java
@@ -0,0 +1,57 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.store.reasoning.translator.crossreference;
+
+import tools.refinery.store.query.dnf.Query;
+import tools.refinery.store.query.dnf.RelationalQuery;
+import tools.refinery.store.query.literal.Literal;
+import tools.refinery.store.query.term.NodeVariable;
+import tools.refinery.store.query.term.Variable;
+import tools.refinery.store.reasoning.literal.CountLowerBoundLiteral;
+import tools.refinery.store.reasoning.representation.PartialRelation;
+import tools.refinery.store.reasoning.translator.multiplicity.Multiplicity;
+import tools.refinery.store.representation.cardinality.FiniteUpperCardinality;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static tools.refinery.store.query.literal.Literals.check;
+import static tools.refinery.store.query.term.int_.IntTerms.constant;
+import static tools.refinery.store.query.term.int_.IntTerms.less;
+import static tools.refinery.store.reasoning.literal.PartialLiterals.may;
+
+class CrossReferenceUtils {
+        private CrossReferenceUtils() {
+                throw new IllegalStateException("This is a static utility class and should not be instantiated directly");
+        }
+
+        public static RelationalQuery createMayHelper(PartialRelation linkType, PartialRelation type,
+                                                                                                  Multiplicity multiplicity, boolean inverse) {
+                String name;
+                NodeVariable variable;
+                List<Variable> arguments;
+                if (inverse) {
+                        name = "Target";
+                        variable = Variable.of("target");
+                        arguments = List.of(Variable.of("source"), variable);
+                } else {
+                        name = "Source";
+                        variable = Variable.of("source");
+                        arguments = List.of(variable, Variable.of("target"));
+                }
+                var builder = Query.builder(linkType.name() + "#mayNew" + name);
+                builder.parameter(variable);
+                var literals = new ArrayList<Literal>();
+                literals.add(may(type.call(variable)));
+                if (multiplicity.multiplicity().upperBound() instanceof FiniteUpperCardinality finiteUpperCardinality) {
+                        var existingLinks = Variable.of("existingLinks", Integer.class);
+                        literals.add(new CountLowerBoundLiteral(existingLinks, linkType, arguments));
+                        literals.add(check(less(existingLinks, constant(finiteUpperCardinality.finiteUpperBound()))));
+                }
+                builder.clause(literals);
+                return builder.build();
+        }
+}