1 files changed, 52 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/scopes/tables/ITableWriterUnary.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/scopes/tables/ITableWriterUnary.java
new file mode 100644
index 00000000..f90d5362
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/scopes/tables/ITableWriterUnary.java
@@ -0,0 +1,52 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2018, Gabor Bergmann, 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.scopes.tables;
+
+import tools.refinery.viatra.runtime.matchers.util.Direction;
+
+/**
+ * Modifies the contents of a unary {@link IIndexTable}.
+ * <p>
+ * <strong>EXPERIMENTAL</strong>. This class or interface has been added as
+ * part of a work in progress. There is no guarantee that this API will
+ * work or that it will remain the same.
+ *
+ * @since 2.0
+ * @author Gabor Bergmann
+ *
+ */
+public interface ITableWriterUnary<Value> {
+
+    /**
+     * Adds/removes a row to/from the table.
+     * 
+     * @param direction
+     *            tells whether putting a row into the table or deleting TODO: store as multiset, return bool?
+     */
+    void write(Direction direction, Value value);
+
+    /**
+     * Intersection type for writers that are also tables
+     */
+    interface Table<Value> extends ITableWriterUnary<Value>, IIndexTable {
+    }
+
+    /**
+     * /dev/null implementation
+     * 
+     * @author Gabor Bergmann
+     */
+    static class Nop<Value> implements ITableWriterUnary<Value> {
+        @Override
+        public void write(Direction direction, Value value) {
+            // NO-OP
+        }
+    }
+}