1 files changed, 64 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/ITuple.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/ITuple.java
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+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/tuple/ITuple.java
@@ -0,0 +1,64 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2017, Zoltan Ujhelyi, IncQuery Labs 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.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Represents both mutable and immutable tuples
+ * 
+ * @author Zoltan Ujhelyi
+ * @since 1.7
+ *
+ */
+public interface ITuple {
+
+    /**
+     * @pre: 0 <= index < getSize()
+     * 
+     * @return the element at the specified index
+     */
+    Object get(int index);
+
+    /**
+     * As the tuple is supposed to be immutable, do not modify the returned array.
+     * @return the array containing all elements of this Tuple
+     */
+    Object[] getElements();
+
+    /**
+     * @return the set containing all distinct elements of this Tuple, cast as type T
+     */
+    <T> Set<T> getDistinctElements();
+
+    /**
+     * @return number of elements
+     */
+    int getSize();
+    
+    /**
+     * Calculates an inverted index of the elements of this pattern. For each element, the index of the (last)
+     * occurrence is calculated.
+     * 
+     * @return the inverted index mapping each element of this pattern to its index in the array
+     */
+    Map<Object, Integer> invertIndex();
+
+    /**
+     * Calculates an inverted index of the elements of this pattern. For each element, the index of all of its
+     * occurrences is calculated.
+     * 
+     * @return the inverted index mapping each element of this pattern to its index in the array
+     */
+    Map<Object, List<Integer>> invertIndexWithMupliplicity();
+
+    Tuple toImmutable();
+}
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