prajna.entity

Class DbpediaVerifier

java.lang.Object

prajna.structure.AbstractDataAccessor<DataRecord,DataRecord>

prajna.structure.accessor.RecordAccessor

prajna.structure.accessor.DbpediaAccessor

prajna.entity.DbpediaVerifier

All Implemented Interfaces:

EntityVerifier, DataAccessor<DataRecord,DataRecord>

public class DbpediaVerifier
extends DbpediaAccessor
implements EntityVerifier

Entity Verifier using DBPedia as an information source. This verifier looks for the type of the object using a SPARQL query.

Author:

Edward Swing

Constructor Summary

Constructors

Constructor and Description
DbpediaVerifier()

Method Summary

Methods

Modifier and Type	Method and Description
EntityType	determineType(java.lang.String term) Determine the entity type for a particular term.
java.lang.String	getModel() Get the model string for this verifier.
java.util.Set<EntityType>	getSupportedTypes() Return the list of types this verifier can verify.
java.lang.String	normalize(java.lang.String term, EntityType type) Normalize the term to its standard form.
void	setModel(java.lang.String model) Set the model for this accessor.
boolean	verifyType(java.lang.String term, EntityType type) Verify that the term matches the type.

Methods inherited from class prajna.structure.accessor.DbpediaAccessor

queryResource, queryResource, retrieveRecords, setInitParameters, setLanguage, setQuery

Methods inherited from class prajna.structure.accessor.RecordAccessor

addFieldHandler, addToGraph, addToTree, createReferenceNode, extendGraph, extendTree, getDataset, getFieldHandler, getGraph, getGrid, getMaxRecords, getReasoner, getStructureReasoners, getTree, setMaxRecords, setReasoner, setReasoner

Methods inherited from class prajna.structure.AbstractDataAccessor

addStructure, addTemplate, getDatasetNames, getGraphNames, getGridNames, getSpec, getStructureType, getTemplate, getTemplateNames, getTreeNames, setConfig, setConfigFile, setConfigFile

Methods inherited from class java.lang.Object

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

Constructor Detail

DbpediaVerifier

public DbpediaVerifier()

Method Detail

determineType

public EntityType determineType(java.lang.String term)

Determine the entity type for a particular term. This method makes a SPARQL query, retrieving the rdf type for the term. If DBPedia returns a type, or set of types, this method determiens the type from the returned types.

Specified by:

determineType in interface EntityVerifier

Parameters:

term - the term to check. This is the extracted entity

Returns:

the entity type for the term.

getModel

public java.lang.String getModel()

Get the model string for this verifier. Currently unimplemented

Specified by:

getModel in interface EntityVerifier

Returns:

null

getSupportedTypes

public java.util.Set<EntityType> getSupportedTypes()

Return the list of types this verifier can verify. All types should be normalized to lower case.

Specified by:

getSupportedTypes in interface EntityVerifier

Returns:

the set of types supported.

normalize

public java.lang.String normalize(java.lang.String term,
                         EntityType type)

Normalize the term to its standard form. The DbpediaVerifier uses

Specified by:

normalize in interface EntityVerifier

Parameters:

term - the term to normalize

type - the entity type. Currently ignored

Returns:

the normalized term, or null if the information does not exist in dbpedia

setModel

public void setModel(java.lang.String model)

Set the model for this accessor. For Dbpedia's accessor, this should point to the ontology containing the classes it should match against. Currently not implemented.

Specified by:

setModel in interface EntityVerifier

Parameters:

model - the model for this verifier

verifyType

public boolean verifyType(java.lang.String term,
                 EntityType type)

Verify that the term matches the type. If the verifier cannot verify the term, or cannot positively identify it as the specified type, it should return false. This method calls determineType to query DBPedia for the type, then determines if the returned type matches the requested type.

Specified by:

verifyType in interface EntityVerifier

Parameters:

term - the term to check. This is the extracted entity

type - the type to check against.

Returns:

true if and only if the verifier can positively determine that the term matches the type, false otherwise.