Sparksee  5.2.0
STSStrongConnectivity Class Reference

StrongConnectivity class. More...

Inheritance diagram for STSStrongConnectivity:
Inheritance graph
Collaboration diagram for STSStrongConnectivity:
Collaboration graph

Instance Methods

(void) - addEdgeType:dir:
 Allows connectivity through edges of the given type.
 
(void) - addAllEdgeTypes:
 Allows connectivity through all edge types of the graph.
 
(void) - addNodeType:
 Allows connectivity through nodes of the given type.
 
(void) - addAllNodeTypes
 Allows connectivity through all node types of the graph.
 
(void) - excludeNodes:
 Set which nodes can't be used.
 
(void) - excludeEdges:
 Set which edges can't be used.
 
(STSConnectedComponents *) - getConnectedComponents
 Returns the results generated by the execution of the algorithm.
 
(void) - run
 Runs the algorithm in order to find the connected components.
 
(void) - setMaterializedAttribute:
 Creates a new common attribute type for all node types in the graph in order to store, persistently, the results related to the connected components found while executing this algorithm.
 
(void) - close
 Closes the Connectivity instance.
 
(BOOL) - isClosed
 Check if the Connectivity instance is closed.
 

Detailed Description

StrongConnectivity class.

Any class implementing this abstract class can be used to solve the problem of finding strongly connected components in a directed graph.

It consists in finding components where every pair (u,v) of nodes contained in it has a path from u to v using the specified direction for each edge type.

It is possible to set some restrictions after constructing a new instance of this class and before running it in order to limit the results.

After the execution, we can retrieve the results stored in an instance of the ConnectedComponents class using the GetConnectedComponents method.

Check out the 'Algorithms' section in the SPARKSEE User Manual for more details on this.

Author
Sparsity Technologies http://www.sparsity-technologies.com

Method Documentation

- (void) addAllEdgeTypes: (enum STSEdgesDirection)  dir

Allows connectivity through all edge types of the graph.

Parameters
dir[in] Edge direction.
- (void) addEdgeType: (int)  type
dir: (enum STSEdgesDirection)  dir 

Allows connectivity through edges of the given type.

Parameters
type[in] Edge type.
dir[in] Edge direction.
- (void) addNodeType: (int)  t

Allows connectivity through nodes of the given type.

Parameters
tnull
- (void) close

Closes the Connectivity instance.

It must be called to ensure the integrity of all data.

- (void) excludeEdges: (STSObjects *)  edges

Set which edges can't be used.

This will replace any previously specified set of excluded edges. Should only be used to exclude the usage of specific edges from allowed edge types because it's less efficient than not allowing an edge type.

Parameters
edges[in] A set of edge identifiers that must be kept intact until the destruction of the class.
- (void) excludeNodes: (STSObjects *)  nodes

Set which nodes can't be used.

This will replace any previously specified set of excluded nodes. Should only be used to exclude the usage of specific nodes from allowed node types because it's less efficient than not allowing a node type.

Parameters
nodes[in] A set of node identifiers that must be kept intact until the destruction of the class.
- (STSConnectedComponents*) getConnectedComponents

Returns the results generated by the execution of the algorithm.

These results contain information related to the connected components found as the number of different components, the set of nodes contained in each component or many other data.

Returns
Returns an instance of the class ConnectedComponents which contain information related to the connected components found.
- (void) run

Runs the algorithm in order to find the connected components.

This method can be called only once.

Implemented in STSStrongConnectivityGabow, and STSWeakConnectivityDFS.

- (void) setMaterializedAttribute: (NSString *)  attributeName

Creates a new common attribute type for all node types in the graph in order to store, persistently, the results related to the connected components found while executing this algorithm.

Whenever the user wants to retrieve the results, even when the graph has been closed and opened again, it is only necessary to create a new instance of the class ConnectedComponents indicating the graph and the name of the common attribute type which stores the results. This instance will have all the information related to the connected components found in the moment of the execution of the algorithm that stored this data.

It is possible to run the algorithm without specifying this parameter in order to avoid materializing the results of the execution.

Parameters
attributeName[in] The name of the common attribute type for all node types in the graph which will store persistently the results generated by the execution of the algorithm.

The documentation for this class was generated from the following file: