1 files changed, 46 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/extensibility/SingletonQueryGroupProvider.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/extensibility/SingletonQueryGroupProvider.java
new file mode 100644
index 00000000..758b51dd
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/extensibility/SingletonQueryGroupProvider.java
@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Abel Hegedus, IncQuery Labs Ltd.
+ * 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.extensibility;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import tools.refinery.viatra.runtime.api.IQueryGroup;
+import tools.refinery.viatra.runtime.api.IQuerySpecification;
+import tools.refinery.viatra.runtime.matchers.util.SingletonInstanceProvider;
+
+/**
+ * Provider implementation for storing an existing query group instance.
+ * 
+ * @author Abel Hegedus
+ * @since 1.3
+ *
+ */
+public class SingletonQueryGroupProvider extends SingletonInstanceProvider<IQueryGroup> implements IQueryGroupProvider {
+
+    /**
+     * @param instance the instance to wrap
+     */
+    public SingletonQueryGroupProvider(IQueryGroup instance) {
+        super(instance);
+    }
+
+    @Override
+    public Set<String> getQuerySpecificationFQNs() {
+        return get().getSpecifications().stream().map(IQuerySpecification::getFullyQualifiedName)
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<IQuerySpecificationProvider> getQuerySpecificationProviders() {
+        return get().getSpecifications().stream().map(SingletonQuerySpecificationProvider::new)
+                .collect(Collectors.toSet());
+    }
+
+}