org.apache.stanbol.entityhub.jersey.utils
Class LDPathHelper

java.lang.Object
  org.apache.stanbol.entityhub.jersey.utils.LDPathHelper

public class LDPathHelper
extends Object

Field Summary

static at.newmedialab.ldpath.model.fields.FieldMapping<Double,Object>

RESULT_SCORE_MAPPING LDPath FieldMapping for the RdfResourceEnum.resultScore property used for the score of query results

Constructor Summary

LDPathHelper()

Method Summary

static Map<String,String>	getLDPathParseExceptionMessage(at.newmedialab.ldpath.exception.LDPathParseException e) Utility that gets the messages of the parsing error.
static javax.ws.rs.core.Response	handleLDPathRequest(org.apache.stanbol.commons.web.base.resource.BaseStanbolResource resource, at.newmedialab.ldpath.api.backend.RDFBackend<Object> backend, String ldpath, Set<String> contexts, javax.ws.rs.core.HttpHeaders headers, javax.servlet.ServletContext servletContext) Processes LDPath requests as supported by the SiteManagerRootResource, ReferencedSiteRootResource, EntityhubRootResource.
static at.newmedialab.ldpath.model.programs.Program<Object>	prepareQueryLDPathProgram(String ldpathProgram, Set<String> selectedFields, org.apache.stanbol.entityhub.ldpath.backend.AbstractBackend backend, org.apache.stanbol.entityhub.ldpath.EntityhubLDPath ldPath)
static Collection<org.apache.stanbol.entityhub.servicesapi.model.Representation>	transformQueryResults(Iterator<org.apache.stanbol.entityhub.servicesapi.model.Representation> resultIt, at.newmedialab.ldpath.model.programs.Program<Object> program, Set<String> selectedFields, org.apache.stanbol.entityhub.ldpath.EntityhubLDPath ldPath, org.apache.stanbol.entityhub.ldpath.backend.AbstractBackend backend, org.apache.stanbol.entityhub.servicesapi.model.ValueFactory vf) Transform the results of a query

Methods inherited from class java.lang.Object

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

Field Detail

RESULT_SCORE_MAPPING

public static final at.newmedialab.ldpath.model.fields.FieldMapping<Double,Object> RESULT_SCORE_MAPPING

LDPath FieldMapping for the RdfResourceEnum.resultScore property used for the score of query results

Constructor Detail

LDPathHelper

public LDPathHelper()

Method Detail

getLDPathParseExceptionMessage

public static Map<String,String> getLDPathParseExceptionMessage(at.newmedialab.ldpath.exception.LDPathParseException e)

Utility that gets the messages of the parsing error. The message about the problem is contained in some parent Exception. Therefore this follows Throwable.getCause()s. The toString method of the returned map will print the "exception: message" in the correct order.

Parameters:

e - the exception

Returns:

the info useful to replay in BAD_REQUEST responses

handleLDPathRequest

public static javax.ws.rs.core.Response handleLDPathRequest(org.apache.stanbol.commons.web.base.resource.BaseStanbolResource resource,
                                                            at.newmedialab.ldpath.api.backend.RDFBackend<Object> backend,
                                                            String ldpath,
                                                            Set<String> contexts,
                                                            javax.ws.rs.core.HttpHeaders headers,
                                                            javax.servlet.ServletContext servletContext)

Processes LDPath requests as supported by the SiteManagerRootResource, ReferencedSiteRootResource, EntityhubRootResource.

Parameters:

resource - The resource used as context when sending RESTful Service API Viewable as response entity.

backend - The RDFBackend implementation

ldpath - the parsed LDPath program

contexts - the Entities to execute the LDPath program

headers - the parsed HTTP headers (used to determine the accepted content type for the response

servletContext - The Servlet context needed for CORS support

Returns:

the Response Response.Status.BAD_REQUEST or Response.Status.OK.

transformQueryResults

public static Collection<org.apache.stanbol.entityhub.servicesapi.model.Representation> transformQueryResults(Iterator<org.apache.stanbol.entityhub.servicesapi.model.Representation> resultIt,
                                                                                                              at.newmedialab.ldpath.model.programs.Program<Object> program,
                                                                                                              Set<String> selectedFields,
                                                                                                              org.apache.stanbol.entityhub.ldpath.EntityhubLDPath ldPath,
                                                                                                              org.apache.stanbol.entityhub.ldpath.backend.AbstractBackend backend,
                                                                                                              org.apache.stanbol.entityhub.servicesapi.model.ValueFactory vf)

Transform the results of a query

Parameters:

resultIt - The Iterator over the results

program - the LDPath Program to execute on the results

selectedFields - additional selected fields of the query

ldPath - the Entityhub LDPath

backend - the AbstractBackend mainly used to add representations of the query to the local cache

vf - the ValueFactory used create References for the String ids of the Representation in the query results

Returns:

A collection with the transformed Representations in the processed order.

prepareQueryLDPathProgram

public static at.newmedialab.ldpath.model.programs.Program<Object> prepareQueryLDPathProgram(String ldpathProgram,
                                                                                             Set<String> selectedFields,
                                                                                             org.apache.stanbol.entityhub.ldpath.backend.AbstractBackend backend,
                                                                                             org.apache.stanbol.entityhub.ldpath.EntityhubLDPath ldPath)
                                                                                      throws at.newmedialab.ldpath.exception.LDPathParseException

Parameters:

ldpathProgram - the LDPath program as string

selectedFields - the selected fields of the query

backend - the RDFBackend (only needed for logging)

ldPath - the LDPath used to parse the program.

Returns:

the pre-processed and validated program

Throws:

at.newmedialab.ldpath.exception.LDPathParseException - if the parsed LDPath program string is not valid

IllegalStateException - if the fields selected by the LDPath program conflict with the fields selected by the query.