y25.base
Class GraphTools

java.lang.Object
  y25.base.GraphTools

public class GraphTools

extends Object

A utility class which provides means to duplicate entire Graphs or Graph2Ds. This is necessary, because the clone methods provided by those classes do not take into account DataProviders that are associated to the respective graphs and therefore remain uncopied.

To copy a Graph, you call DuplicateGraph, DuplicateGraph2D or ConvertGraphToGraph2D and specify the DataProviders that should be copied. This is accomplished via the GraphTools.GraphDataInfo class.

Nested Class Summary

static class	GraphTools.GraphDataInfo Stores information about a DataProvider.
static interface	GraphTools.RealizerFactory An interface for creation of node and edge realizers.

Constructor Summary

GraphTools()

Method Summary

static Graph2D	ConvertGraphToGraph2D(Graph graph, GraphTools.GraphDataInfo[] dataInfo, NodeRealizer defaultNodeRealizer, EdgeRealizer defaultEdgeRealizer) Creates a copy of the given Graph.
static Graph	DuplicateGraph(Graph graph, GraphTools.GraphDataInfo[] dataInfo) Creates a copy of the given Graph.
static Graph2D	DuplicateGraph2D(Graph2D graph, GraphTools.GraphDataInfo[] dataInfo, GraphTools.RealizerFactory realizerFactory) Creates a copy of the given Graph2D.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GraphTools

public GraphTools()

Method Detail

DuplicateGraph

public static Graph DuplicateGraph(Graph graph,
                                   GraphTools.GraphDataInfo[] dataInfo)

Creates a copy of the given Graph.

All nodes and edges of the given graph are copied. The index of a both nodes and edges is the same in the duplicate graph. The in/out order of edges is kept as well (! This is not true yet !).

Furthermore, the user can specify which DataProviders should be copied by providing their respective keys. For each data provider, the user also has to specify if it assigns values to nodes or to edges and the type of the values. This is done via the GraphDataInfo class.

Implementation Details: In order to copy DataProviders, new Node/EdgeMaps are created for each of them. Then each DataProvider is asked for the value of all nodes/edges and the result is stored in the appropriate Node/Edgemap. Then these Node/Edgemaps are registered as new DataProviders in the new graph. Therefore, dynamic DataProviders will not be copied correctly, since the values they return will be made constant through the copy process.

Parameters:

graph - the source graph that is to be duplicated

dataInfo - holds information about which DataProviders should be copied

Returns:

the duplicated Graph that has the specified DataProviders attatched to it. If graph is null, no copying takes place and null is returned.

ConvertGraphToGraph2D

public static Graph2D ConvertGraphToGraph2D(Graph graph,
                                            GraphTools.GraphDataInfo[] dataInfo,
                                            NodeRealizer defaultNodeRealizer,
                                            EdgeRealizer defaultEdgeRealizer)

Creates a copy of the given Graph.

All nodes and edges of the given graph are copied. The index of a both nodes and edges is the same in the duplicate graph. The in/out order of edges is kept as well (! This is not true yet !).

Furthermore, the user can specify which DataProviders should be copied by providing their respective keys. For each data provider, the user also has to specify if it assigns values to nodes or to edges and the type of the values. This is done via the GraphDataInfo class.

Implementation Details: In order to copy DataProviders, new Node/EdgeMaps are created for each of them. Then each DataProvider is asked for the value of all nodes/edges and the result is stored in the appropriate Node/Edgemap. Then these Node/Edgemaps are registered as new DataProviders in the new graph. Therefore, dynamic DataProviders will not be copied correctly, since the values they return will be made constant through the copy process.

Parameters:

graph - the source graph that is to be duplicated

dataInfo - holds information about which DataProviders should be copied

Returns:

the duplicated Graph that has the specified DataProviders attatched to it. If graph is null, no copying takes place and null is returned.

DuplicateGraph2D

public static Graph2D DuplicateGraph2D(Graph2D graph,
                                       GraphTools.GraphDataInfo[] dataInfo,
                                       GraphTools.RealizerFactory realizerFactory)

Creates a copy of the given Graph2D.

All nodes and edges of the given graph are copied. The index of a both nodes and edges is the same in the duplicate graph. The in/out order of edges is kept as well (! This is not true yet !).

Furthermore, the user can specify which DataProviders should be copied by providing their respective keys. For each data provider, the user also has to specify if it assigns values to nodes or to edges and the type of the values. This is done via the GraphDataInfo class.

A Graph2D stores Realizers for its Nodes and Edges. Each Realizer has to provide a createCopy method that creates an appropriate copy of the Realizer. So, when duplicating a Graph2D, one could just call these methods. This method takes another approach though. Instead of calling the createCopy methods directly, it lets the user specify a RelizerFactory that will handle the copying process for Realizers. For every NodeRealizer in the source graph, RealizerFactory.copyNodeRealizer is called and for every EdgeRealizer in the source graph RealizerFactory.copyEdgeRealizer is called. This way, the user can provide a specific RealizerFactory implementation that doesn't simply copy the Realizers but also modifies them or returns a Realizer type that is different from the source. (This is extremely useful in the context adding existing Graph2D objects to a Graph25D. There, all Node- and EdgeRealizers have to be converted to their 25D counterparts in order to provide correct OpenGL rendering. This is done internally by passing a Realizer25DFactory object to this routine.)

Implementation Details: In order to copy DataProviders, new Node/EdgeMaps are created for each of them. Then each DataProvider is asked for the value of all nodes/edges and the result is stored in the appropriate Node/Edgemap. Then these Node/Edgemaps are registered as new DataProviders in the new graph. Therefore, dynamic DataProviders will not be copied correctly, since the values they return will be made constant through the copy process.

Parameters:

graph - the source graph that is to be duplicated

dataInfo - holds information about which DataProviders should be copied

realizerFactory - responsible for copying all Node- and EdgeRealizers

Returns:

the duplicated Graph2D that has the specified DataProviders attatched to it. If graph is null, no copying takes place and null is returned.