1 files changed, 59 insertions, 0 deletions

diff --git a/subprojects/store-dse/src/main/java/tools/refinery/store/dse/transition/objectives/QueryCriterion.java b/subprojects/store-dse/src/main/java/tools/refinery/store/dse/transition/objectives/QueryCriterion.java
new file mode 100644
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--- /dev/null
+++ b/subprojects/store-dse/src/main/java/tools/refinery/store/dse/transition/objectives/QueryCriterion.java
@@ -0,0 +1,59 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.store.dse.transition.objectives;
+
+import tools.refinery.store.model.Model;
+import tools.refinery.store.model.ModelStore;
+import tools.refinery.store.model.ModelStoreBuilder;
+import tools.refinery.store.query.ModelQueryAdapter;
+import tools.refinery.store.query.ModelQueryBuilder;
+import tools.refinery.store.query.ModelQueryStoreAdapter;
+import tools.refinery.store.query.dnf.AnyQuery;
+import tools.refinery.store.query.literal.Reduction;
+
+public class QueryCriterion implements Criterion {
+        protected final boolean satisfiedIfHasMatch;
+        protected final AnyQuery query;
+
+        /**
+         * Criteria based on the existence of matches evaluated on the model.
+         *
+         * @param query               The query evaluated on the model.
+         * @param satisfiedIfHasMatch If true, the criteria satisfied if the query has any match on the model. Otherwise,
+         *                            the criteria satisfied if the query has no match on the model.
+         */
+        public QueryCriterion(AnyQuery query, boolean satisfiedIfHasMatch) {
+                this.query = query;
+                this.satisfiedIfHasMatch = satisfiedIfHasMatch;
+        }
+
+        @Override
+        public Reduction getReduction(ModelStore store) {
+                var queryStore = store.getAdapter(ModelQueryStoreAdapter.class);
+                var canonicalQuery = queryStore.getCanonicalQuery(query);
+                var reduction = canonicalQuery.getDnf().getReduction();
+                if (satisfiedIfHasMatch) {
+                        return reduction;
+                }
+                return reduction.negate();
+        }
+
+        @Override
+        public CriterionCalculator createCalculator(Model model) {
+                var resultSet = model.getAdapter(ModelQueryAdapter.class).getResultSet(query);
+                if (satisfiedIfHasMatch) {
+                        return () -> resultSet.size() > 0;
+                } else {
+                        return () -> resultSet.size() == 0;
+                }
+        }
+
+        @Override
+        public void configure(ModelStoreBuilder storeBuilder) {
+                Criterion.super.configure(storeBuilder);
+                storeBuilder.getAdapter(ModelQueryBuilder.class).query(query);
+        }
+}