1 files changed, 48 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/MaskedTuple.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/MaskedTuple.java
new file mode 100644
index 00000000..a5d1991c
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/MaskedTuple.java
@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2004-2009 Gabor Bergmann 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.tuple;
+
+/**
+ * A tuple that transparently provides a masked (transformed) view of another tuple.
+ * 
+ * @author Gabor Bergmann
+ * @since 2.0
+ * 
+ */
+public class MaskedTuple extends Tuple {
+
+    Tuple wrapped;
+    TupleMask mask;
+
+    public MaskedTuple(Tuple wrapped, TupleMask mask) {
+        super();
+        // if (wrapped instanceof MaskedTuple) {
+        // MaskedTuple parent = (MaskedTuple)wrapped;
+        // this.wrapped = parent.wrapped;
+        // this.mask = mask.transform(parent.mask);
+        // }
+        // else
+        //{
+            this.wrapped = wrapped;
+            this.mask = mask;
+        //}
+    }
+
+    @Override
+    public Object get(int index) {
+        return wrapped.get(mask.indices[index]);
+    }
+
+    @Override
+    public int getSize() {
+        return mask.indices.length;
+    }
+
+}