nz.ac.waikato.mcennis.rat.graph.algorithm.prestige
Class HITSPrestige

java.lang.Object
  nz.ac.waikato.mcennis.rat.graph.model.ModelShell
      nz.ac.waikato.mcennis.rat.graph.algorithm.prestige.HITSPrestige

All Implemented Interfaces:

java.io.Serializable, Component, Algorithm, Model

public class HITSPrestige
extends ModelShell
implements Algorithm

Class implementing a naive implementation of Kelinberg's HITS algorithm (Kleinberg99)

Kleinberg, J. 1999. "Authoritative sources in a hyperlinked environment." Journal of the ACM. 46(5):604--32.

See Also:

Serialized Form

Field Summary

Fields inherited from class nz.ac.waikato.mcennis.rat.graph.model.ModelShell

listener

Constructor Summary

HITSPrestige()
Creates a new instance of HITSPrestige

Method Summary

void	execute(Graph g) Implements the HITS algorithm by directly calculating the eigenvector matrix using Colt's matrix operators.
java.util.List<IODescriptor>	getInputType() The input type describes all the different kinds of graph objects that are utilized (and hence required) by this object.
java.util.List<IODescriptor>	getOutputType() The output type describes all the different kinds of graph objects that are created during the execution of this algorithm.
Properties	getParameter() List of all parameters this component accepts.
Parameter	getParameter(java.lang.String param) Returns the specific parameter identified by its key-name.
void	init(Properties map) Parameters to be initialized 'name' - Name of this instance of the algorithm.
HITSPrestige	prototype() All Components implement the prototype pattern.

Methods inherited from class nz.ac.waikato.mcennis.rat.graph.model.ModelShell

addListener, fireChange

Methods inherited from class java.lang.Object

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

Methods inherited from interface nz.ac.waikato.mcennis.rat.graph.model.Model

addListener

Constructor Detail

HITSPrestige

public HITSPrestige()

Creates a new instance of HITSPrestige

Method Detail

execute

public void execute(Graph g)

Implements the HITS algorithm by directly calculating the eigenvector matrix using Colt's matrix operators. This is O(n2) in space. Creates a Hub and Authority score for each actor.

Specified by:

execute in interface Algorithm

Parameters:

g - graph to be modified

getInputType

public java.util.List<IODescriptor> getInputType()

Description copied from interface: Component

The input type describes all the different kinds of graph objects that are utilized (and hence required) by this object. This result is only guaranteed to be fixed if structural parameters are not modified. This is an empty array if there is no input.

Specified by:

getInputType in interface Component

Returns:

IODescriptor array for this component

See Also:

IODescriptor

getOutputType

public java.util.List<IODescriptor> getOutputType()

Description copied from interface: Component

The output type describes all the different kinds of graph objects that are created during the execution of this algorithm. The result is only guaranteed to be fixed if structural parameters are not modified. This is an empty array if there is no output.

Specified by:

getOutputType in interface Component

Returns:

IODescriptor array for this component

See Also:

IODescriptor

getParameter

public Properties getParameter()

Description copied from interface: Component

List of all parameters this component accepts. Each parameter also has a distinct key-name used when initializing the object using the init method. If there are no parameters, null is returned.

Specified by:

getParameter in interface Component

Returns:

read-only array of Parameters

getParameter

public Parameter getParameter(java.lang.String param)

Description copied from interface: Component

Returns the specific parameter identified by its key-name. If no parameter is found with this key-name, null is returned.

Specified by:

getParameter in interface Component

Parameters:

param - key-name of the parameter

Returns:

named parameter

init

public void init(Properties map)

Parameters to be initialized

1. 'name' - Name of this instance of the algorithm. Default is 'HITS Centrality'.
2. 'relation' - name of the type (relation) of link to calculate over. Default is 'Knows'.
3. 'actorSourceType' - type (mode) of actor to calculate over. Default 'User'.
4. 'propertyNamePrefix' - name of the property prefic to use when listing algorithm output. Deafult 'Knows HITS'.

Input 0 - Link
Output 0 - Actor Property
Output 1 - Actor Property

Specified by:

init in interface Component

Parameters:

map - map of the given properties naming parameters and their values in a string

prototype

public HITSPrestige prototype()

Description copied from interface: Component

All Components implement the prototype pattern. The new parameter has no common resources to the original that are not static resources o the class.

Specified by:

prototype in interface Component

Specified by:

prototype in interface Algorithm

Returns:

default-parameter version of the same class as the original.