1 files changed, 47 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/VolatileTuple.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/VolatileTuple.java
new file mode 100644
index 00000000..699105a5
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/VolatileTuple.java
@@ -0,0 +1,47 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2017 Zoltan Ujhelyi, IncQuery Labs
+ * 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.tuple;
+
+/**
+ * Mutable tuple without explicit modification commands. In practical terms, the values stored in a volatile tuple can
+ * be changed without any notification.
+ * 
+ * @author Zoltan Ujhelyi
+ * @since 1.7
+ * 
+ */
+public abstract class VolatileTuple extends AbstractTuple {
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (!(obj instanceof ITuple))
+            return false;
+        final ITuple other = (ITuple) obj;
+        return internalEquals(other);
+    }
+
+    @Override
+    public int hashCode() {
+        return doCalcHash();
+    }
+
+    /**
+     * Creates an immutable tuple from the values stored in the tuple. The created tuple will not be updated when the
+     * current tuple changes.
+     */
+    @Override
+    public Tuple toImmutable() {
+        return Tuples.flatTupleOf(getElements());
+    }
+}