1 files changed, 36 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/backend/CommonQueryHintOptions.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/backend/CommonQueryHintOptions.java
new file mode 100644
index 00000000..317293bf
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/backend/CommonQueryHintOptions.java
@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2017, Grill Balázs, IncQueryLabs
+ * 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.backend;
+
+import tools.refinery.viatra.runtime.matchers.psystem.rewriters.IRewriterTraceCollector;
+import tools.refinery.viatra.runtime.matchers.psystem.rewriters.NopTraceCollector;
+
+/**
+ * Query evaluation hints applicable to any engine
+ * @since 1.6
+ *
+ */
+public final class CommonQueryHintOptions {
+    
+    private CommonQueryHintOptions() {
+        // Hiding constructor for utility class
+    }
+    
+    /**
+     * This hint instructs the query backends to record trace information into the given trace collector
+     */
+    public static final QueryHintOption<IRewriterTraceCollector> normalizationTraceCollector = 
+            hintOption("normalizationTraceCollector", NopTraceCollector.INSTANCE);
+    
+    // internal helper for conciseness
+    private static <T> QueryHintOption<T> hintOption(String hintKeyLocalName, T defaultValue) {
+        return new QueryHintOption<>(CommonQueryHintOptions.class, hintKeyLocalName, defaultValue);
+    }
+
+}