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/*******************************************************************************
* Copyright (c) 2010-2012, Tamas Szabo, 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.itc.igraph;
import tools.refinery.viatra.runtime.matchers.util.IMemoryView;
import tools.refinery.viatra.runtime.matchers.util.IMultiset;
import java.util.Set;
/**
* The interface prescribes the set of operations that a graph data source must support.
* <p> Note that the old version of the interface is broken at version 1.6;
* MultiSets are now presented as Maps instead of Lists.
*
* @author Tamas Szabo
*
* @param <V>
* the type of the nodes in the graph
*/
public interface IGraphDataSource<V> {
/**
* Attaches a new graph observer to this graph data source. Observers will be notified in the order they have been registered.
*
* @param observer the graph observer
*/
public void attachObserver(IGraphObserver<V> observer);
/**
* Attaches a new graph observer to this graph data source as the first one.
* In the notification order this observer will be the first one as long as another call to this method happens.
*
* @param observer the graph observer
* @since 1.6
*/
public void attachAsFirstObserver(IGraphObserver<V> observer);
/**
* Detaches an already registered graph observer from this graph data source.
*
* @param observer the graph observer
*/
public void detachObserver(IGraphObserver<V> observer);
/**
* Returns the complete set of nodes in the graph data source.
*
* @return the set of all nodes
*/
public Set<V> getAllNodes();
/**
* Returns the target nodes for the given source node.
* The returned data structure is an {@link IMultiset} because of potential parallel edges in the graph data source.
*
* The method must not return null.
*
* @param source the source node
* @return the multiset of target nodes
* @since 2.0
*/
public IMemoryView<V> getTargetNodes(V source);
}
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