1 files changed, 68 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/boundary/ExternalInputStatelessFilterNode.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/boundary/ExternalInputStatelessFilterNode.java
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index 00000000..57e06911
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+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/boundary/ExternalInputStatelessFilterNode.java
@@ -0,0 +1,68 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2015, Bergmann Gabor, Istvan Rath and Daniel Varro
+ * 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.rete.boundary;
+
+import tools.refinery.viatra.runtime.matchers.context.IInputKey;
+import tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContext;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.rete.matcher.ReteEngine;
+import tools.refinery.viatra.runtime.rete.network.ReteContainer;
+import tools.refinery.viatra.runtime.rete.single.FilterNode;
+
+/**
+ * A filter node representing a (stateless, typically non-enumerable) extensional input relation.
+ * 
+ * <p> Contains those tuples of its parents, that (when transformed by a mask, if given) are present in the extensional relation identified by the input key.
+ * 
+ * @author Bergmann Gabor
+ *
+ */
+public class ExternalInputStatelessFilterNode extends FilterNode implements Disconnectable {
+    
+    IQueryRuntimeContext context = null;
+    IInputKey inputKey;
+    private InputConnector inputConnector;
+    private TupleMask mask;
+
+    public ExternalInputStatelessFilterNode(ReteContainer reteContainer, TupleMask mask) {
+        super(reteContainer);
+        this.mask = mask;
+        this.inputConnector = reteContainer.getNetwork().getInputConnector();
+    }
+    
+    @Override
+    public boolean check(Tuple ps) {
+        if (mask != null) 
+            ps = mask.transform(ps);
+        return context.containsTuple(inputKey, ps);
+    }
+    
+    
+    public void connectThroughContext(ReteEngine engine, IInputKey inputKey) {
+        this.inputKey = inputKey;
+        setTag(inputKey);
+        
+        final IQueryRuntimeContext context = engine.getRuntimeContext();
+        if (!context.getMetaContext().isStateless(inputKey))
+            throw new IllegalArgumentException(
+                    this.getClass().getSimpleName() + 
+                    " only applicable for stateless input keys; received instead " + 
+                    inputKey);
+        
+        this.context = context;
+        
+        engine.addDisconnectable(this);
+    }
+    
+    @Override
+    public void disconnect() {
+        this.context = null;
+    }
+}