RequestParamHandler Class Reference

Analyzes an HttpServletRequest to check for the presence of an ?output=n3 or =ttl or =rdfxml request parameter in the URI. More...

Collaboration diagram for RequestParamHandler:

Classes
class	WrappedRequest

Public Member Functions
	RequestParamHandler (HttpServletRequest request)
boolean	isMatchingRequest ()
HttpServletRequest	getModifiedRequest ()

Static Public Member Functions
static String	removeOutputRequestParam (String uri)
	Removes the "output=foobar" part of a URI if present. More...

Static Package Functions
	[static initializer]

Private Member Functions
String	identifyRequestedType (String parameterValue)

Private Attributes
final HttpServletRequest	request
final String	requestedType

Static Private Attributes
static final String	ATTRIBUTE_NAME_IS_HANDLED
static final Map< String, String >	mimeTypes = new HashMap<String,String>()

Detailed Description

Analyzes an HttpServletRequest to check for the presence of an ?output=n3 or =ttl or =rdfxml request parameter in the URI.

If present, returns a modified HttpServletRequest that has the appropriate MIME type in the Accept: header. This request can then be fed into the rest of our content negotiation based tooling.

Constructor & Destructor Documentation

RequestParamHandler()

RequestParamHandler

(

HttpServletRequest

request

)

                                                               {
                this.request = request;
                requestedType = identifyRequestedType(request.getParameter("output"));
        }

References RequestParamHandler.identifyRequestedType(), RequestParamHandler.request, and RequestParamHandler.requestedType.

Member Function Documentation

[static initializer]()

[static initializer]

staticpackage

getModifiedRequest()

HttpServletRequest getModifiedRequest

(

)

                                                       {
                return new WrappedRequest();
        }

Referenced by ModelResponse.ModelResponse().

identifyRequestedType()

String identifyRequestedType ( String  parameterValue )

private

                                                                    {
                if (mimeTypes.containsKey(parameterValue)) {
                        return parameterValue;
                }
                return null;
        }

References RequestParamHandler.mimeTypes.

Referenced by RequestParamHandler.RequestParamHandler().

isMatchingRequest()

boolean isMatchingRequest

(

)

                                           {
                if ("true".equals(request.getAttribute(ATTRIBUTE_NAME_IS_HANDLED))) {
                        return false;
                }
                return requestedType != null;
        }

References RequestParamHandler.ATTRIBUTE_NAME_IS_HANDLED, RequestParamHandler.request, and RequestParamHandler.requestedType.

Referenced by ModelResponse.ModelResponse().

removeOutputRequestParam()

static String removeOutputRequestParam ( String  uri )

static

Removes the "output=foobar" part of a URI if present.

                                                                  {
                // Remove the param: output=[a-z0-9]*
                // There are two cases. The param can occur at the end of the URI,
                // this is matched by the first part: [?&]param$
                // Or it can occur elsewhere, then it's matched by param& with a
                // lookbehind that requires [?&] to occur before the pattern.
                return uri.replaceFirst("([?&]output=[a-z0-9]*$)|((?<=[?&])output=[a-z0-9]*&)", "");
        }

Member Data Documentation

ATTRIBUTE_NAME_IS_HANDLED

final String ATTRIBUTE_NAME_IS_HANDLED

staticprivate

Initial value:

=
                "OutputRequestParamHandler.isHandled"

Referenced by RequestParamHandler.isMatchingRequest(), and RequestParamHandler.WrappedRequest.WrappedRequest().

mimeTypes

final Map<String,String> mimeTypes = new HashMap<String,String>()

staticprivate

Referenced by RequestParamHandler.WrappedRequest.getHeader(), and RequestParamHandler.identifyRequestedType().

request

final HttpServletRequest request

private

Referenced by RequestParamHandler.isMatchingRequest(), RequestParamHandler.RequestParamHandler(), and RequestParamHandler.WrappedRequest.WrappedRequest().

requestedType

final String requestedType

private

Referenced by RequestParamHandler.WrappedRequest.getHeader(), RequestParamHandler.isMatchingRequest(), and RequestParamHandler.RequestParamHandler().