Package org.eclipse.rdf4j.workbench.util

Class QueryEvaluator

java.lang.Object

org.eclipse.rdf4j.workbench.util.QueryEvaluator

public final class QueryEvaluator
extends Object

Evaluates queries for QueryServlet.

Field Summary

Fields

Modifier and Type	Field	Description
static QueryEvaluator	INSTANCE

Method Summary

Modifier and Type	Method	Description
void	evaluateTupleQuery(TupleResultBuilder builder, String xslPath, WorkbenchRequest req, javax.servlet.http.HttpServletResponse resp, CookieHandler cookies, TupleQuery query, boolean writeCookie, boolean paged, int offset, int limit)	Evaluate a tuple query, and create an XML results document.
void	evaluateTupleQuery(TupleResultBuilder builder, TupleQuery query)	Evaluate a tuple query, and create an XML results document.
void	extractQueryAndEvaluate(TupleResultBuilder builder, javax.servlet.http.HttpServletResponse resp, OutputStream out, String xslPath, RepositoryConnection con, String queryText, WorkbenchRequest req, CookieHandler cookies)	Evaluates the query submitted with the given request.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final QueryEvaluator INSTANCE

Method Detail

extractQueryAndEvaluate

public void extractQueryAndEvaluate(TupleResultBuilder builder,
                                    javax.servlet.http.HttpServletResponse resp,
                                    OutputStream out,
                                    String xslPath,
                                    RepositoryConnection con,
                                    String queryText,
                                    WorkbenchRequest req,
                                    CookieHandler cookies)
                             throws BadRequestException,
                                    RDF4JException

Evaluates the query submitted with the given request.

Parameters:

builder - used to build the response

resp - the response object

out - the output writer

xslPath - style sheet path

con - connection to repository

queryText - the query text, having been pulled using QueryServlet from one of three request parameters: "query", "queryhash" or "saved"

req - the request object

cookies - used to deal with browser cookies

Throws:

BadRequestException - if there's a problem getting request parameters or issuing the repository query

RDF4JException - if there's a problem preparing the query

evaluateTupleQuery

public void evaluateTupleQuery(TupleResultBuilder builder,
                               String xslPath,
                               WorkbenchRequest req,
                               javax.servlet.http.HttpServletResponse resp,
                               CookieHandler cookies,
                               TupleQuery query,
                               boolean writeCookie,
                               boolean paged,
                               int offset,
                               int limit)
                        throws QueryEvaluationException,
                               QueryResultHandlerException

Evaluate a tuple query, and create an XML results document. This method completes writing of the response. !paged means use all results.

Parameters:

builder - response builder helper for generating the XML response to the client, which must not have had start() called on it

xslPath - needed to begin writing response body after writing result count cookie

req - needed to write result count cookie

resp - needed to write result count cookie

cookies - needed to write result count cookie

query - the query to be evaluated

writeCookie - whether to write the total result count cookie

paged - whether to display a limited subset

Throws:

QueryResultHandlerException

QueryEvaluationException

evaluateTupleQuery

public void evaluateTupleQuery(TupleResultBuilder builder,
                               TupleQuery query)
                        throws QueryEvaluationException,
                               QueryResultHandlerException

Evaluate a tuple query, and create an XML results document. It is still necessary to call end() on the builder after calling this method.

Parameters:

builder - response builder helper for generating the XML response to the client, which must have had start() called on it

query - the query to be evaluated

Throws:

QueryResultHandlerException

QueryEvaluationException