Class BaseSparqlQueryHandler

Abstract Base class for Handlers which provide SPARQL Query endpoints
Inheritance
System.Object
BaseSparqlQueryHandler
QueryHandler
Namespace: VDS.RDF.Web
Assembly: dotNetRDF.Web.dll
Syntax
public abstract class BaseSparqlQueryHandler : IHttpHandler

Fields

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_config

Handler Configuration
Declaration
protected BaseQueryHandlerConfiguration _config
Field Value
Type Description
BaseQueryHandlerConfiguration

Properties

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IsReusable

Returns that the Handler is reusable
Declaration
public bool IsReusable { get; }
Property Value
Type Description
System.Boolean

Methods

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HandleErrors(HttpContext, String, String, Exception)

Handles errors in processing SPARQL Query Requests
Declaration
protected virtual void HandleErrors(HttpContext context, String title, String query, Exception ex)
Parameters
Type Name Description
HttpContext context Context of the HTTP Request
String title Error title
String query Sparql Query
Exception ex Error
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HandleErrors(HttpContext, String, String, Exception, Int32)

Handles errors in processing SPARQL Query Requests
Declaration
protected virtual void HandleErrors(HttpContext context, String title, String query, Exception ex, int statusCode)
Parameters
Type Name Description
HttpContext context Context of the HTTP Request
String title Error title
String query Sparql Query
Exception ex Error
System.Int32 statusCode HTTP Status Code to return
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LoadConfig(HttpContext)

Loads the Handler Configuration
Declaration
protected abstract BaseQueryHandlerConfiguration LoadConfig(HttpContext context)
Parameters
Type Name Description
HttpContext context HTTP Context
Returns
Type Description
BaseQueryHandlerConfiguration
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ProcessQuery(SparqlQuery)

Processes a Query
Declaration
protected virtual Object ProcessQuery(SparqlQuery query)
Parameters
Type Name Description
SparqlQuery query Query
Returns
Type Description
Object
Remarks

Implementations should override this method if their behaviour requires more than just invoking the configured Query processor

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ProcessRequest(HttpContext)

Processes a SPARQL Query Request
Declaration
public void ProcessRequest(HttpContext context)
Parameters
Type Name Description
HttpContext context HTTP Context
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ProcessResults(HttpContext, Object)

Processes the Results and returns them to the Client in the HTTP Response
Declaration
protected virtual void ProcessResults(HttpContext context, Object result)
Parameters
Type Name Description
HttpContext context HTTP Context
Object result Result Object
Remarks

Implementations should override this if they do not want to use the default results processing behaviour provided by SendToClient(IHttpContext, Object)

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ShowQueryForm(HttpContext)

Generates a Sparql Query Form
Declaration
protected virtual void ShowQueryForm(HttpContext context)
Parameters
Type Name Description
HttpContext context
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UpdateConfig(HttpContext)

Updates the Handler Configuration
Declaration
protected virtual void UpdateConfig(HttpContext context)
Parameters
Type Name Description
HttpContext context HTTP Context

Extension Methods