org.eclipse.viatra.query.runtime.base.itc.igraph

Interface IGraphDataSource<V>

Type Parameters:

V - the type of the nodes in the graph

All Superinterfaces:

java.io.Serializable

All Known Subinterfaces:

IBiDirectionalGraphDataSource<V>

All Known Implementing Classes:

Graph, IBiDirectionalWrapper

public interface IGraphDataSource<V>
extends java.io.Serializable

The interface prescribes the set of operations that a graph data source must support.

Note that the old version of the interface is broken at version 1.6; MultiSets are now presented as Maps instead of Lists.

Method Summary

Modifier and Type	Method and Description
void	attachAsFirstObserver(IGraphObserver<V> observer) Attaches a new graph observer to this graph data source as the first one.
void	attachObserver(IGraphObserver<V> observer) Attaches a new graph observer to this graph data source.
void	detachObserver(IGraphObserver<V> observer) Detaches an already registered graph observer from this graph data source.
java.util.Set<V>	getAllNodes() Returns the complete set of nodes in the graph data source.
java.util.Map<V,java.lang.Integer>	getTargetNodes(V source) Returns the target nodes for the given source node.

Method Detail

attachObserver

void attachObserver(IGraphObserver<V> observer)

Attaches a new graph observer to this graph data source. Observers will be notified in the order they have been registered.

Parameters:

observer - the graph observer

attachAsFirstObserver

void attachAsFirstObserver(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.

Parameters:

observer - the graph observer

Since:

1.6

detachObserver

void detachObserver(IGraphObserver<V> observer)

Detaches an already registered graph observer from this graph data source.

Parameters:

observer - the graph observer

getAllNodes

java.util.Set<V> getAllNodes()

Returns the complete set of nodes in the graph data source.

Returns:

the set of all nodes

getTargetNodes

java.util.Map<V,java.lang.Integer> getTargetNodes(V source)

Returns the target nodes for the given source node. The returned data structure is a map (essentially a MultiSet) because of potential parallel edges in the graph data source. The values in the returned map represent the count of the given (source, target) edge. The method must not return null.

Parameters:

source - the source node

Returns:

the target nodes with their count values

Since:

1.6