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java.lang.Objectorg.graphstream.algorithm.Eccentricity
public class Eccentricity
Compute the eccentricity of a connected graph.
In a graph G, if d(u,v) is the shortest length between two nodes u and v (ie the number of edges of the shortest path) let e(u) be the d(u,v) such that v is the farthest of u. Eccentricity of a graph G is a subgraph induced by vertices u with minimum e(u).
This algorithm needs that APSP algorithm has been computed before its own computation.
import java.io.StringReader; import java.io.IOException; import org.graphstream.algorithm.Centroid; import org.graphstream.graph.Graph; import org.graphstream.graph.implementations.DefaultGraph; import org.graphstream.stream.file.FileSourceDGS; // +--- E // A --- B --- C -- D -|--- F // +--- G public class EccentriciyTest { static String my_graph = "DGS004\n" + "my 0 0\n" + "an A \n" + "an B \n" + "an C \n" + "an D \n" + "an E \n" + "an F \n" + "an G \n" + "ae AB A B \n" + "ae BC B C \n" + "ae CD C D \n" + "ae DE D E \n" + "ae DF D F \n" + "ae DG D G \n"; public static void main(String[] args) throws IOException { Graph graph = new DefaultGraph("Centroid Test"); StringReader reader = new StringReader(my_graph); FileSourceDGS source = new FileSourceDGS(); source.addSink(graph); source.readAll(reader); APSP apsp = new APSP(); apsp.init(graph); apsp.compute(); Eccentricity eccentricity = new Eccentricity(); eccentricity.init(graph); eccentricity.compute(); for (Node n : graph.getEachNode()) { Boolean in = n.getAttribute("eccentricity"); System.out.printf("%s is%s in the eccentricity.\n", n.getId(), in ? "" : " not"); } // Output will be : // // A is not in the eccentricity // B is not in the eccentricity // C is in the eccentricity // D is not in the eccentricity // E is not in the eccentricity // F is not in the eccentricity // G is not in the eccentricity } }
APSP.APSPInfo
Constructor Summary | |
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Eccentricity()
Build a new eccentricity algorithm with default parameters. |
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Eccentricity(String eccentricityAttribute)
Build a new eccentricity algorithm, specifying the attribute name of the computation result |
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Eccentricity(String eccentricityAttribute,
Object isInEccentricity,
Object isNotInEccentricity)
Build a new eccentricity as in Eccentricity(String) but
specifying values of eccentricity membership. |
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Eccentricity(String eccentricityAttribute,
Object isInEccentricity,
Object isNotInEccentricity,
String apspInfoAttribute)
Build a new eccentricity algorithm as in Eccentricity(String, Object, Object) but specifying the name of
the attribute where the APSP informations are stored. |
Method Summary | |
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void |
compute()
Run the algorithm. |
String |
getAPSPInfoAttribute()
Get the APSP info attribute name. |
String |
getEccentricityAttribute()
Get the name of the attribute where computation result is stored. |
Object |
getIsInEccentricityValue()
Get the value of the eccentricity attribute when element is in the eccentricity. |
Object |
getIsNotInEccentricityValue()
Get the value of the eccentricity attribute when element is not in the eccentricity. |
void |
init(org.graphstream.graph.Graph graph)
Initialization of the algorithm. |
void |
setAPSPInfoAttribute(String attribute)
Set the APSP info attribute name. |
void |
setEccentricityAttribute(String eccentricityAttribute)
Set the name of the attribute where computation result is stored. |
void |
setIsInEccentricityValue(Object value)
Set the value of the eccentricity attribute when element is in the eccentricity. |
void |
setIsNotInEccentricityValue(Object value)
Set the value of the eccentricity attribute when element is not in the eccentricity. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public Eccentricity()
public Eccentricity(String eccentricityAttribute)
eccentricityAttribute
- attribute name of the computation result.public Eccentricity(String eccentricityAttribute, Object isInEccentricity, Object isNotInEccentricity)
Eccentricity(String)
but
specifying values of eccentricity membership.
eccentricityAttribute
- attribute name of the computation result.isInEccentricity
- the value of elements eccentricity attribute when this element
is in the eccentricity.isNotInEccentricity
- the value of elements eccentricity attribute when this element
is not in the eccentricity.public Eccentricity(String eccentricityAttribute, Object isInEccentricity, Object isNotInEccentricity, String apspInfoAttribute)
Eccentricity(String, Object, Object)
but specifying the name of
the attribute where the APSP informations are stored.
eccentricityAttribute
- attribute name of the computation result.isInEccentricity
- the value of elements eccentricity attribute when this element
is in the eccentricity.isNotInEccentricity
- the value of elements eccentricity attribute when this element
is not in the eccentricity.apspInfoAttribute
- the name of the attribute where the APSP informations are
storedMethod Detail |
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public void init(org.graphstream.graph.Graph graph)
Algorithm
Algorithm.compute()
method to initialize or reset the algorithm according
to the new given graph.
init
in interface Algorithm
graph
- The graph this algorithm is using.public void compute()
Algorithm
Algorithm.init(Graph)
method has to be called
before computing.
compute
in interface Algorithm
Algorithm.init(Graph)
public String getAPSPInfoAttribute()
public void setAPSPInfoAttribute(String attribute)
attribute
- the name of the attribute where the APSP informations are
stored.public Object getIsInEccentricityValue()
public void setIsInEccentricityValue(Object value)
value
- the value of elements eccentricity attribute when this element
is in the eccentricity.public Object getIsNotInEccentricityValue()
public void setIsNotInEccentricityValue(Object value)
value
- the value of elements eccentricity attribute when this element
is not in the eccentricity.public String getEccentricityAttribute()
getIsInEccentricityValue()
if the
element is in the eccentricity, getIsNotInEccentricityValue()
else.
public void setEccentricityAttribute(String eccentricityAttribute)
eccentricityAttribute
- the name of the element attribute where computation result is
stored.
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