1 files changed, 33 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/extensibility/PQueryExtensionFactory.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/extensibility/PQueryExtensionFactory.java
new file mode 100644
index 00000000..91e087d7
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/extensibility/PQueryExtensionFactory.java
@@ -0,0 +1,33 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2015, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
+ * 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 org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import tools.refinery.viatra.runtime.api.IQuerySpecification;
+
+/**
+ * An extension factory to access PQuery instances from Query Specifications.
+ * 
+ * @author Zoltan Ujhelyi
+ *
+ */
+public class PQueryExtensionFactory extends SingletonExtensionFactory {
+
+    @Override
+    public Object create() throws CoreException {
+        final Object _spec = super.create();
+        if (_spec instanceof IQuerySpecification<?>) {
+            return ((IQuerySpecification<?>) _spec).getInternalQueryRepresentation();
+        }
+        throw new CoreException(new Status(IStatus.ERROR, getBundle().getSymbolicName(), "Cannot instantiate PQuery instance."));
+    }
+
+}