1 files changed, 56 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/TupleMask0.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/TupleMask0.java
new file mode 100644
index 00000000..5a0c79ff
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/TupleMask0.java
@@ -0,0 +1,56 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2017, Gabor Bergmann, IncQueryLabs 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.matchers.tuple;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * @author Gabor Bergmann
+ * @since 1.7
+ */
+public final class TupleMask0 extends TupleMask {
+    
+    private final static int[] EMPTY_ARRAY = {};
+
+    /**
+     * PRE: indices.length == 0
+     */
+    TupleMask0(int sourceWidth) {
+        super(EMPTY_ARRAY, sourceWidth, EMPTY_ARRAY, true);
+    }
+    
+    @Override
+    public <T> List<T> transform(List<T> original) {
+        return Collections.emptyList();
+    }
+    
+    @Override
+    public Tuple transform(ITuple original) {
+        return Tuples.staticArityFlatTupleOf();
+    }
+
+    @Override
+    public TupleMask transform(TupleMask mask) {
+        return new TupleMask0(mask.sourceWidth);
+    }
+
+    @Override
+    public Tuple combine(Tuple unmasked, Tuple masked, boolean useInheritance, boolean asComplementer) {
+        if (asComplementer)
+            return unmasked;
+        else
+            return super.combine(unmasked, masked, useInheritance, asComplementer);
+    }
+    
+    @Override
+    public boolean isIdentity() {
+        return 0 == sourceWidth;
+    }
+}