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/*******************************************************************************
* 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;
}
}
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