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/*******************************************************************************
* Copyright (c) 2010-2012, 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.misc;
import java.util.Collection;
import java.util.Collections;
import tools.refinery.viatra.runtime.rete.network.BaseNode;
import tools.refinery.viatra.runtime.rete.network.Receiver;
import tools.refinery.viatra.runtime.rete.network.ReteContainer;
import tools.refinery.viatra.runtime.rete.network.Supplier;
import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
import tools.refinery.viatra.runtime.rete.network.mailbox.timeless.BehaviorChangingMailbox;
import tools.refinery.viatra.runtime.rete.network.mailbox.timely.TimelyMailbox;
import tools.refinery.viatra.runtime.rete.traceability.TraceInfo;
/**
* @author Bergmann Gabor
*
*/
public abstract class SimpleReceiver extends BaseNode implements Receiver {
protected Supplier parent = null;
/**
* @since 1.6
*/
protected final Mailbox mailbox;
/**
* @param reteContainer
*/
public SimpleReceiver(ReteContainer reteContainer) {
super(reteContainer);
mailbox = instantiateMailbox();
reteContainer.registerClearable(mailbox);
}
/**
* Instantiates the {@link Mailbox} of this receiver.
* Subclasses may override this method to provide their own mailbox implementation.
*
* @return the mailbox
* @since 2.0
*/
protected Mailbox instantiateMailbox() {
if (this.reteContainer.isTimelyEvaluation()) {
return new TimelyMailbox(this, this.reteContainer);
} else {
return new BehaviorChangingMailbox(this, this.reteContainer);
}
}
@Override
public Mailbox getMailbox() {
return this.mailbox;
}
@Override
public void appendParent(Supplier supplier) {
if (parent == null)
parent = supplier;
else
throw new UnsupportedOperationException("Illegal RETE edge: " + this + " already has a parent (" + parent
+ ") and cannot connect to additional parent (" + supplier
+ ") as it is not a Uniqueness Enforcer Node. ");
}
@Override
public void removeParent(Supplier supplier) {
if (parent == supplier)
parent = null;
else
throw new IllegalArgumentException("Illegal RETE edge removal: the parent of " + this + " is not "
+ supplier);
}
@Override
public Collection<Supplier> getParents() {
if (parent == null)
return Collections.emptySet();
else
return Collections.singleton(parent);
}
/**
* Disconnects this node from the network. Can be called publicly.
*
* @pre: child nodes, if any, must already be disconnected.
*/
public void disconnectFromNetwork() {
if (parent != null)
reteContainer.disconnect(parent, this);
}
@Override
public void assignTraceInfo(TraceInfo traceInfo) {
super.assignTraceInfo(traceInfo);
if (traceInfo.propagateFromStandardNodeToSupplierParent())
if (parent != null)
parent.acceptPropagatedTraceInfo(traceInfo);
}
}
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