1 files changed, 140 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/scopes/tables/SimpleUnaryTable.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/scopes/tables/SimpleUnaryTable.java
new file mode 100644
index 00000000..428ea78b
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/scopes/tables/SimpleUnaryTable.java
@@ -0,0 +1,140 @@
+/*******************************************************************************
+ * 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 java.util.Optional;
+import java.util.stream.Stream;
+
+import tools.refinery.viatra.runtime.matchers.context.IInputKey;
+import tools.refinery.viatra.runtime.matchers.tuple.ITuple;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
+import tools.refinery.viatra.runtime.matchers.util.Accuracy;
+import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
+import tools.refinery.viatra.runtime.matchers.util.Direction;
+import tools.refinery.viatra.runtime.matchers.util.IMemory;
+
+/**
+ * Simple value set.
+ * <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 class SimpleUnaryTable<Value> extends AbstractIndexTable implements ITableWriterUnary.Table<Value> {
+
+    protected IMemory<Value> values = CollectionsFactory.createMultiset(); // TODO use SetMemory if unique
+
+    private boolean unique;
+
+    /**
+     * @param unique
+     *            client promises to only insert a given tuple with multiplicity one
+     */
+    public SimpleUnaryTable(IInputKey inputKey, ITableContext tableContext, boolean unique) {
+        super(inputKey, tableContext);
+        this.unique = unique;
+        if (1 != inputKey.getArity())
+            throw new IllegalArgumentException(inputKey.toString());
+    }
+
+    @Override
+    public void write(Direction direction, Value value) {
+        if (direction == Direction.INSERT) {
+            boolean changed = values.addOne(value);
+            if (unique && !changed) {
+                String msg = String.format(
+                        "Error: trying to add duplicate value %s to the unique set %s. This indicates some errors in underlying model representation.",
+                        value, getInputKey().getPrettyPrintableName());
+                logError(msg);
+            }
+            if (changed && emitNotifications) {
+                deliverChangeNotifications(Tuples.staticArityFlatTupleOf(value), true);
+            }
+        } else { // DELETE
+            boolean changed = values.removeOne(value);
+            if (unique && !changed) {
+                String msg = String.format(
+                        "Error: trying to remove duplicate value %s from the unique set %s. This indicates some errors in underlying model representation.",
+                        value, getInputKey().getPrettyPrintableName());
+                logError(msg);
+            }
+            if (changed && emitNotifications) {
+                deliverChangeNotifications(Tuples.staticArityFlatTupleOf(value), false);
+            }
+        }
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public boolean containsTuple(ITuple seed) {
+        return values.containsNonZero((Value) seed.get(0));
+    }
+
+    @Override
+    public int countTuples(TupleMask seedMask, ITuple seed) {
+        if (seedMask.getSize() == 0) { // unseeded
+            return values.size();
+        } else {
+            @SuppressWarnings("unchecked")
+            Value value = (Value) seed.get(0);
+            return values.containsNonZero(value) ? 1 : 0;
+        }
+    }
+
+
+    @Override
+    public Optional<Long> estimateProjectionSize(TupleMask groupMask, Accuracy requiredAccuracy) {
+        // always exact count
+        if (groupMask.getSize() == 0) {
+            return values.isEmpty() ? Optional.of(0L) : Optional.of(1L);
+        } else {
+            return Optional.of((long)values.size());
+        }
+    }
+
+    
+    @Override
+    public Stream<? extends Tuple> streamTuples(TupleMask seedMask, ITuple seed) {
+        if (seedMask.getSize() == 0) { // unseeded
+            return values.distinctValues().stream().map(Tuples::staticArityFlatTupleOf);
+        } else {
+            @SuppressWarnings("unchecked")
+            Value value = (Value) seed.get(0);
+            if (values.containsNonZero(value))
+                return Stream.of(Tuples.staticArityFlatTupleOf(value));
+            else
+                return Stream.empty();
+        }
+    }
+
+    @Override
+    public Iterable<? extends Object> enumerateValues(TupleMask seedMask, ITuple seed) {
+        if (seedMask.getSize() == 0) { // unseeded
+            return values;
+        } else {
+            throw new IllegalArgumentException(seedMask.toString());
+        }
+    }
+    @Override
+    public Stream<? extends Object> streamValues(TupleMask seedMask, ITuple seed) {
+        if (seedMask.getSize() == 0) { // unseeded
+            return values.asStream();
+        } else {
+            throw new IllegalArgumentException(seedMask.toString());
+        }
+    }
+    
+
+}