1 files changed, 51 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/FlatTuple2.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/FlatTuple2.java
new file mode 100644
index 00000000..2dcfd718
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/FlatTuple2.java
@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * 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.Objects;
+
+/**
+ * Flat tuple with statically known arity of 2.
+ * 
+ * @author Gabor Bergmann
+ * @since 1.7
+ *
+ */
+public final class FlatTuple2 extends BaseFlatTuple {
+    private final Object element0;
+    private final Object element1;
+
+    protected FlatTuple2(Object element0, Object element1) {
+        this.element0 = element0;
+        this.element1 = element1;
+        calcHash();
+   }
+
+    @Override
+    public int getSize() {
+        return 2;
+    }
+
+    @Override
+    public Object get(int index) {
+        switch(index) {
+        case 0 : return element0;
+        case 1 : return element1;
+        default: throw raiseIndexingError(index);
+        }
+    }
+    
+    @Override
+    protected boolean internalEquals(ITuple other) {
+        return 2 == other.getSize() &&
+                Objects.equals(element0, other.get(0)) &&
+                Objects.equals(element1, other.get(1));
+    }
+
+}