de.fuberlin.wiwiss.semmf.taxon
Class Taxonomy

java.lang.Object
  de.fuberlin.wiwiss.semmf.taxon.Taxonomy

public class Taxonomy
extends java.lang.Object

This class represents the hierarchical structure of concepts from a given ontology. The parent-child relationship between concepts must be indicated by the rdfs:subClassOf property !!! RESTRICTION: This class works properly for ontologies, where only BottomConcepts (concepts at the lowest haierarchy level, which do not have any children) are allowed to have multiple parents, e.g. to have more positions in the concept hierarchy.

Version:

1.3 last modified 29.11.2006

Author:

Radoslaw Oldakowski

Field Summary

private java.util.Map	concepts A hash map storing all descendants of the root concept in the taxonomy provided to the constructor
int	deepestLevel Index of the deepest level (= number of levels - 1)
private java.lang.String	ontURL URL of the taxonomy file file
private java.lang.String	rootURI URI of the root concept

Constructor Summary

Taxonomy(java.lang.String ontURL, java.lang.String rootConceptURI)
This constructor uses the Jena2 API to read the ontology from an RDF document and create the hierarchy tree.

Method Summary

private void	createHierarchyTree(com.hp.hpl.jena.rdf.model.Model model, com.hp.hpl.jena.rdf.model.Resource r, SuperConcept superC, int level) Creates the parent-child-relationship among concepts from this taxonomy
SuperConcept	findCCP(SuperConcept c1, SuperConcept c2)
Concept	getConcept(java.lang.String conceptURI) For a given URI returns the Concept object inside this taxonomy

Methods inherited from class java.lang.Object

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

Field Detail

concepts

private java.util.Map concepts

A hash map storing all descendants of the root concept in the taxonomy provided to the constructor

ontURL

private java.lang.String ontURL

URL of the taxonomy file file

rootURI

private java.lang.String rootURI

URI of the root concept

deepestLevel

public int deepestLevel

Index of the deepest level (= number of levels - 1)

Constructor Detail

Taxonomy

public Taxonomy(java.lang.String ontURL,
                java.lang.String rootConceptURI)

This constructor uses the Jena2 API to read the ontology from an RDF document and create the hierarchy tree.

Parameters:

ontURL - location of the ontology file

rootConceptURI - URI of the root concept inside the ontology

Method Detail

getConcept

public Concept getConcept(java.lang.String conceptURI)

For a given URI returns the Concept object inside this taxonomy

Parameters:

conceptURI - URI of the concept

findCCP

public SuperConcept findCCP(SuperConcept c1,
                            SuperConcept c2)

Returns:

the closest common parent of two SuperConcepts (concepts which have at least one subConcept)

createHierarchyTree

private void createHierarchyTree(com.hp.hpl.jena.rdf.model.Model model,
                                 com.hp.hpl.jena.rdf.model.Resource r,
                                 SuperConcept superC,
                                 int level)

Creates the parent-child-relationship among concepts from this taxonomy

Parameters:

model - Jena RDF model

r - Jena Resource from this model

superC - SuperConcept of r

level - hierarchy level