org.eclipse.rdf4j.workbench.commands

Class QueryServlet

java.lang.Object

org.eclipse.rdf4j.workbench.base.AbstractServlet

org.eclipse.rdf4j.workbench.base.AbstractRepositoryServlet

org.eclipse.rdf4j.workbench.base.TransformationServlet

org.eclipse.rdf4j.workbench.commands.QueryServlet

All Implemented Interfaces:

javax.servlet.Servlet, RepositoryServlet

public class QueryServlet
extends TransformationServlet

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	LIMIT
protected static String	QUERY
protected static String	REF
protected boolean	writeQueryCookie

Fields inherited from class org.eclipse.rdf4j.workbench.base.TransformationServlet

CONTEXT, cookies, INFO, NON_VERIFYING_PARSER_CONFIG

Fields inherited from class org.eclipse.rdf4j.workbench.base.AbstractRepositoryServlet

info, manager, MANAGER_PARAM, repository, REPOSITORY_PARAM, vf

Fields inherited from class org.eclipse.rdf4j.workbench.base.AbstractServlet

appConfig, APPLICATION_JAVASCRIPT, APPLICATION_SPARQL_RESULTS_XML, APPLICATION_XML, config, DEFAULT_JSONP_CALLBACK_PARAMETER, JSONP_CALLBACK_PARAMETER, JSONP_ENABLED, JSONP_VALIDATOR, log, MOZILLA, MSIE, SERVER_PASSWORD, SERVER_USER, SERVER_USER_PASSWORD, TEXT_HTML, USER_AGENT

Constructor Summary

Constructors

Constructor and Description
QueryServlet()

Method Summary

Modifier and Type	Method and Description
void	destroy()
protected void	doPost(WorkbenchRequest req, javax.servlet.http.HttpServletResponse resp, String xslPath)
String[]	getCookieNames()
protected String	getQueryText(WorkbenchRequest req)
void	init(javax.servlet.ServletConfig config) Initialize this instance of the servlet.
void	service(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp) Long query strings could blow past the Tomcat default 8k HTTP header limit if stuffed into a cookie.
protected void	service(WorkbenchRequest req, javax.servlet.http.HttpServletResponse resp, String xslPath)
protected boolean	shouldWriteQueryCookie(String queryText) Determines if the servlet should write out the query text into a cookie as received, or write it's hash instead.
protected static void	substituteQueryCache(Map<String,String> testQueryCache) For testing purposes only.
protected void	substituteQueryStorage(QueryStorage storage)

Methods inherited from class org.eclipse.rdf4j.workbench.base.TransformationServlet

service

Methods inherited from class org.eclipse.rdf4j.workbench.base.AbstractRepositoryServlet

setRepository, setRepositoryInfo, setRepositoryManager

Methods inherited from class org.eclipse.rdf4j.workbench.base.AbstractServlet

checkJSONP, getBooleanResultFormat, getJSONPResultFormat, getResultWriter, getServletConfig, getServletInfo, getTupleResultBuilder, getTupleResultFormat, service

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.servlet.Servlet

getServletConfig, getServletInfo, service

Field Detail

REF

protected static final String REF

See Also:

Constant Field Values

LIMIT

protected static final String LIMIT

See Also:

Constant Field Values

QUERY

protected static final String QUERY

See Also:

Constant Field Values

writeQueryCookie

protected boolean writeQueryCookie

Constructor Detail

QueryServlet

public QueryServlet()

Method Detail

substituteQueryCache

protected static void substituteQueryCache(Map<String,String> testQueryCache)

For testing purposes only.

Parameters:

testQueryCache - cache to use instead of the production cache instance

substituteQueryStorage

protected void substituteQueryStorage(QueryStorage storage)

getCookieNames

public String[] getCookieNames()

Overrides:

getCookieNames in class TransformationServlet

Returns:

the names of the cookies that will be retrieved from the request, and returned in the response

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException

Initialize this instance of the servlet.

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class TransformationServlet

Parameters:

config - configuration passed in by the application container

Throws:

javax.servlet.ServletException

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Servlet

Overrides:

destroy in class AbstractServlet

service

public final void service(javax.servlet.http.HttpServletRequest req,
                          javax.servlet.http.HttpServletResponse resp)
                   throws javax.servlet.ServletException,
                          IOException

Long query strings could blow past the Tomcat default 8k HTTP header limit if stuffed into a cookie. In this case, we need to set a flag to avoid this happening before TransformationServlet.service(HttpServletRequest, HttpServletResponse) is called. A much lower limit on the size of the query text is used to stay well below the Tomcat limitation.

Overrides:

service in class TransformationServlet

Throws:

javax.servlet.ServletException

IOException

shouldWriteQueryCookie

protected boolean shouldWriteQueryCookie(String queryText)

Determines if the servlet should write out the query text into a cookie as received, or write it's hash instead.

Note: This is a separate method for testing purposes.

Parameters:

queryText - the text received as the value for the parameter 'query'

service

protected void service(WorkbenchRequest req,
                       javax.servlet.http.HttpServletResponse resp,
                       String xslPath)
                throws IOException,
                       RDF4JException,
                       BadRequestException,
                       org.json.JSONException

Overrides:

service in class TransformationServlet

Throws:

IOException

RDF4JException

BadRequestException

org.json.JSONException

doPost

protected void doPost(WorkbenchRequest req,
                      javax.servlet.http.HttpServletResponse resp,
                      String xslPath)
               throws IOException,
                      BadRequestException,
                      RDF4JException,
                      org.json.JSONException

Overrides:

doPost in class TransformationServlet

Throws:

IOException

BadRequestException

RDF4JException

org.json.JSONException

getQueryText

protected String getQueryText(WorkbenchRequest req)
                       throws BadRequestException,
                              RDF4JException

Parameters:

req - for looking at the request parameters

Returns:

the query text, if it can somehow be retrieved from request parameters, otherwise an empty string

Throws:

BadRequestException - if a problem occurs grabbing the request from storage

RDF4JException - if a problem occurs grabbing the request from storage