1 files changed, 83 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/LeftInheritanceTuple1.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/LeftInheritanceTuple1.java
new file mode 100644
index 00000000..61123176
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/LeftInheritanceTuple1.java
@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * 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 LeftInheritanceTuple1 extends BaseLeftInheritanceTuple {
+    /**
+     * A single substituted value after inheritedIndex. 
+     */
+    private final Object localElement;
+
+    /**
+     * @param ancestor
+     * @param localElement
+     */
+    protected LeftInheritanceTuple1(Tuple ancestor, Object localElement) {
+        super(ancestor);
+        this.localElement = localElement;
+        calcHash();
+    }
+    
+    /**
+     * @return number of elements
+     */
+    public int getSize() {
+        return inheritedIndex + 1;
+    }
+
+    @Override
+    public int getLocalSize() {
+        return 1;
+    }
+
+    /**
+     * @pre: 0 <= index < getSize()
+     * 
+     * @return the element at the specified index
+     */
+    public Object get(int index) {
+        int local = index - inheritedIndex;
+        if (local < 0) 
+            return ancestor.get(index);
+        else if (local == 0) return localElement;
+        else throw raiseIndexingError(index);
+    }
+
+    /**
+     * Optimized hash calculation
+     */
+    @Override
+    void calcHash() {
+        final int PRIME = 31;
+        cachedHash = ancestor.hashCode();
+        cachedHash = PRIME * cachedHash;
+        if (localElement != null) cachedHash += localElement.hashCode();
+    }
+
+    /**
+     * Optimized equals calculation (prediction: true, since hash values match)
+     */    
+    @Override
+    protected boolean localEquals(BaseLeftInheritanceTuple other) {
+        if (other instanceof LeftInheritanceTuple1) {
+            LeftInheritanceTuple1 lit = (LeftInheritanceTuple1)other;
+            return Objects.equals(this.localElement, lit.localElement);
+        } else {
+            return (1 == other.getLocalSize()) && 
+                    Objects.equals(localElement, other.get(inheritedIndex));
+        }
+    }
+
+}