1 files changed, 73 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/LeftInheritanceTuple2.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/LeftInheritanceTuple2.java
new file mode 100644
index 00000000..e9fb98e8
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/LeftInheritanceTuple2.java
@@ -0,0 +1,73 @@
+/*******************************************************************************
+ * 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;
+
+/**
+ * @author Gabor Bergmann
+ * @since 1.7
+ */
+public final class LeftInheritanceTuple2 extends BaseLeftInheritanceTuple {
+    private final Object localElement0;
+    private final Object localElement1;
+    
+    protected LeftInheritanceTuple2(Tuple ancestor, Object localElement0, Object localElement1) {
+        super(ancestor);
+        this.localElement0 = localElement0;
+        this.localElement1 = localElement1;
+        calcHash();
+    }
+
+    @Override
+    public int getLocalSize() {
+        return 2;
+    }
+    
+    @Override
+    public int getSize() {
+        return inheritedIndex + 2;
+    }
+
+    @Override
+    public Object get(int index) {
+        int local = index - inheritedIndex;
+        if (local < 0) 
+            return ancestor.get(index);
+        else if (local == 0) return localElement0;
+        else if (local == 1) return localElement1;
+        else throw raiseIndexingError(index);
+    }
+
+    /**
+     * Optimized hash calculation
+     */
+    @Override
+    void calcHash() {
+        final int PRIME = 31;
+        cachedHash = ancestor.hashCode();
+        cachedHash = PRIME * cachedHash;
+        if (localElement0 != null) cachedHash += localElement0.hashCode();
+        cachedHash = PRIME * cachedHash;
+        if (localElement1 != null) cachedHash += localElement1.hashCode();
+    }
+
+    @Override
+    protected boolean localEquals(BaseLeftInheritanceTuple other) {
+        if (other instanceof LeftInheritanceTuple2) {
+            LeftInheritanceTuple2 lit = (LeftInheritanceTuple2)other;
+            return Objects.equals(this.localElement0, lit.localElement0) &&
+                    Objects.equals(this.localElement1, lit.localElement1);
+        } else {
+            return (2 == other.getLocalSize()) && 
+                    Objects.equals(localElement0, other.get(inheritedIndex)) && 
+                    Objects.equals(localElement1, other.get(inheritedIndex + 1));
+        }
+    }
+}