org.openrdf.workbench.util

Class QueryStorage

java.lang.Object

org.openrdf.workbench.util.QueryStorage

public class QueryStorage
extends Object

Provides an interface to the private repository with the saved queries.

Author:

Dale Visser

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	QueryStorage(AppConfiguration appConfig) Create a new object for accessing the store of user queries.

Method Summary

Modifier and Type	Method and Description
boolean	askExists(HTTPRepository repository, String queryName, String userName)
boolean	canChange(URI query, String currentUser) Determines whether the user with the given userName is allowed to update or delete the given query.
boolean	canRead(URI query, String currentUser) Determines whether the user with the given userName is allowed to read the given query.
boolean	checkAccess(HTTPRepository repository) Checks whether the current user/password credentials can really access the current repository.
void	deleteQuery(URI query, String userName) Delete the given query for the given user.
String	getQueryText(HTTPRepository repository, String owner, String queryName) Retrieves the specified query text.
static QueryStorage	getSingletonInstance(AppConfiguration config)
void	saveQuery(HTTPRepository repository, String queryName, String userName, boolean shared, QueryLanguage queryLanguage, String queryText, boolean infer, int rowsPerPage) Save a query.
void	selectSavedQueries(HTTPRepository repository, String userName, TupleResultBuilder builder) Prepares a query to retrieve the queries accessible to the given user in the given repository.
URI	selectSavedQuery(HTTPRepository repository, String owner, String queryName) Returns the URI for the saved query in the given repository with the given name, owned by the given owner.
void	shutdown()
void	updateQuery(URI query, String userName, boolean shared, QueryLanguage queryLanguage, String queryText, boolean infer, int rowsPerPage) Update the entry for the given query.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryStorage

protected QueryStorage(AppConfiguration appConfig)
                throws RepositoryException,
                       IOException

Create a new object for accessing the store of user queries.

Parameters:

appConfig - the application configuration, for obtaining the data directory

Throws:

RepositoryException - if there is an issue creating the object to access the repository

IOException

Method Detail

getSingletonInstance

public static QueryStorage getSingletonInstance(AppConfiguration config)
                                         throws RepositoryException,
                                                IOException

Throws:

RepositoryException

IOException

shutdown

public void shutdown()

checkAccess

public boolean checkAccess(HTTPRepository repository)
                    throws RepositoryException

Checks whether the current user/password credentials can really access the current repository.

Parameters:

repository - the current repository

Returns:

true, if it is possible to request a statement from the repository with the given credentials

Throws:

RepositoryException - if there is an issue closing the connection

saveQuery

public void saveQuery(HTTPRepository repository,
                      String queryName,
                      String userName,
                      boolean shared,
                      QueryLanguage queryLanguage,
                      String queryText,
                      boolean infer,
                      int rowsPerPage)
               throws OpenRDFException

Save a query. UNSAFE from an injection point of view. It is the responsibility of the calling code to call checkAccess() with the full credentials first.

Parameters:

repository - the repository the query is associated with

queryName - the name for the query

userName - the user saving the query

shared - whether the query is to be shared with other users

queryLanguage - the language, SeRQL or SPARQL, of the query

queryText - the actual query text

infer -

rowsPerPage - rows to display per page, may be 0 (all), 10, 50, 100, or 200)

Throws:

OpenRDFException

canChange

public boolean canChange(URI query,
                         String currentUser)
                  throws RepositoryException,
                         QueryEvaluationException,
                         MalformedQueryException

Determines whether the user with the given userName is allowed to update or delete the given query.

Parameters:

query - the node identifying the query of interest

currentUser - the user to check access for

Returns:

true if the given query was saved by the given user or the anonymous user

Throws:

RepositoryException

QueryEvaluationException

MalformedQueryException

canRead

public boolean canRead(URI query,
                       String currentUser)
                throws RepositoryException,
                       QueryEvaluationException,
                       MalformedQueryException

Determines whether the user with the given userName is allowed to read the given query.

Parameters:

query - the node identifying the query of interest

currentUser - the user to check access for

Returns:

true if the given query was saved by either the given user or the anonymous user, or is shared

Throws:

RepositoryException

QueryEvaluationException

MalformedQueryException

askExists

public boolean askExists(HTTPRepository repository,
                         String queryName,
                         String userName)
                  throws QueryEvaluationException,
                         RepositoryException,
                         MalformedQueryException

Throws:

QueryEvaluationException

RepositoryException

MalformedQueryException

deleteQuery

public void deleteQuery(URI query,
                        String userName)
                 throws RepositoryException,
                        UpdateExecutionException,
                        MalformedQueryException

Delete the given query for the given user. It is the responsibility of the calling code to call checkAccess() and canDelete() with the full credentials first.

Parameters:

query -

userName -

Throws:

RepositoryException

UpdateExecutionException

MalformedQueryException

updateQuery

public void updateQuery(URI query,
                        String userName,
                        boolean shared,
                        QueryLanguage queryLanguage,
                        String queryText,
                        boolean infer,
                        int rowsPerPage)
                 throws RepositoryException,
                        UpdateExecutionException,
                        MalformedQueryException

Update the entry for the given query. It is the responsibility of the calling code to call checkAccess() with the full credentials first.

Parameters:

query - the query to update

userName - the user name

shared - whether to share with other users

queryLanguage - the query language

queryText - the text of the query

infer -

rowsPerPage - the rows per page to display of the query

Throws:

RepositoryException - if a problem occurs during the update

UpdateExecutionException - if a problem occurs during the update

MalformedQueryException - if a problem occurs during the update

selectSavedQueries

public void selectSavedQueries(HTTPRepository repository,
                               String userName,
                               TupleResultBuilder builder)
                        throws RepositoryException,
                               MalformedQueryException,
                               QueryEvaluationException,
                               QueryResultHandlerException

Prepares a query to retrieve the queries accessible to the given user in the given repository. When evaluated, the query result will have the following binding names: query, user, queryName, shared, queryLn, queryText, rowsPerPage. It is the responsibility of the calling code to call checkAccess() with the full credentials first.

Parameters:

repository - that the saved queries run against

userName - that is requesting the saved queries

builder - receives a list of all the saved queries against the given repository and accessible to the given user

Throws:

RepositoryException - if there's a problem connecting to the saved queries repository

MalformedQueryException - if the query is not legal SPARQL

QueryEvaluationException - if there is a problem while attempting to evaluate the query

QueryResultHandlerException

selectSavedQuery

public URI selectSavedQuery(HTTPRepository repository,
                            String owner,
                            String queryName)
                     throws OpenRDFException,
                            BadRequestException

Returns the URI for the saved query in the given repository with the given name, owned by the given owner.

Parameters:

repository - The repository the query is associated with.

owner - The user that saved the query.

queryName - The name given to the query.

Returns:

if it exists, the URI referring to the specified saved query.

Throws:

OpenRDFException - if issues occur performing the necessary queries.

BadRequestException - if the the specified stored query doesn't exist

getQueryText

public String getQueryText(HTTPRepository repository,
                           String owner,
                           String queryName)
                    throws OpenRDFException,
                           BadRequestException

Retrieves the specified query text. No security checks are done here. If the saved query exists, its text is returned.

Parameters:

repository - Repository that the saved query is associated with.

owner - The user that saved the query.

queryName - The name given to the saved query.

Returns:

the text of the saved query, if it exists

Throws:

OpenRDFException - if a problem occurs accessing storage

BadRequestException - if the specified query doesn't exist