1 files changed, 64 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/planning/operations/PJoin.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/planning/operations/PJoin.java
new file mode 100644
index 00000000..10e0a85a
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/planning/operations/PJoin.java
@@ -0,0 +1,64 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2014, Bergmann Gabor, 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.matchers.planning.operations;
+
+import java.util.Collections;
+import java.util.Set;
+
+import tools.refinery.viatra.runtime.matchers.psystem.PConstraint;
+
+/**
+ * Represents a natural join of two parent SubPlans.
+ * @author Bergmann Gabor
+ *
+ */
+public class PJoin extends POperation {
+    
+//      // TODO leave here? is this a problem in equivalnece checking?
+//      private Set<PVariable> onVariables;
+
+    public PJoin(/*Set<PVariable> onVariables*/) {
+        super();
+        //this.onVariables = new HashSet<PVariable>(onVariables);
+    }
+//      public Set<PVariable> getOnVariables() {
+//              return onVariables;
+//      }
+
+    @Override
+    public Set<? extends PConstraint> getDeltaConstraints() {
+        return Collections.emptySet();
+    }
+    @Override
+    public int numParentSubPlans() {
+        return 2;
+    }
+
+    @Override
+    public String getShortName() {
+        return "JOIN"; //String.format("JOIN_{%s}", Joiner.on(",").join(onVariables));
+    }
+    
+    @Override
+    public int hashCode() {
+        return getClass().hashCode();
+    }
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (!(obj instanceof PJoin))
+            return false;
+        return true;
+    }
+    
+
+}