com.esri.gpt.framework.context
Class BaseServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          com.esri.gpt.framework.context.BaseServlet

All Implemented Interfaces:

Serializable, Servlet, ServletConfig

Direct Known Subclasses:

AsnServlet, CswInfoServlet, CswServlet, DiscoveryServlet, GeorssFeedServlet, HarvesterServlet, HarvestPublishServlet, IndexStatsServlet, ManageDocumentServlet, OpenSearchDescriptionServlet, PublicationServlet, RepositoriesServlet, RestQueryServlet, RestServlet, ServletConnector, SitemapServlet, ThumbnailServlet, TocServlet

public abstract class BaseServlet
extends HttpServlet

Super-class for HttpServlet end-points.

See Also:

Serialized Form

Constructor Summary

BaseServlet()

Method Summary

protected void	authenticate(RequestContext context, Credentials credentials) Authenticate credentials found within and HTTP request.
protected void	doGet(HttpServletRequest request, HttpServletResponse response) Handles a GET request.
protected void	doPost(HttpServletRequest request, HttpServletResponse response) Handles a POST request.
protected abstract void	execute(HttpServletRequest request, HttpServletResponse response, RequestContext context) Processes the HTTP request.
protected UsernamePasswordCredentials	getCredentials(HttpServletRequest request) Looks for username:password credentials within the Authorization header parameter of the HTTP request.
protected Logger	getLogger() Gets the logger.
protected String	getParameterValue(HttpServletRequest request, String name) Gets a request parameter value.
protected String	getRealm(RequestContext context) Gets the identity store realm (used as an identifier during HTTP 401 credential challenge/response).
protected String	readInputCharacters(HttpServletRequest request) Fully reads the characters from the request input stream.
protected void	writeCharacterResponse(HttpServletResponse response, String content, String charset, String contentType) Writes characters to the response stream.
protected void	writeHtmlResponse(HttpServletResponse response, String content) Convience method for writeCharacterResponse.
protected void	writeXmlResponse(HttpServletResponse response, String content) Convience method for writeCharacterResponse.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseServlet

public BaseServlet()

Method Detail

authenticate

protected void authenticate(RequestContext context,
                            Credentials credentials)
                     throws CredentialsDeniedException,
                            IdentityException,
                            SQLException

Authenticate credentials found within and HTTP request.

Parameters:

context - the active request context

credentials - the credentials to authenticate

Throws:

CredentialsDeniedException - if credentials are denied

IdentityException - if a system error occurs preventing authentication

SQLException - if a database communication exception occurs

doGet

protected void doGet(HttpServletRequest request,
                     HttpServletResponse response)
              throws ServletException,
                     IOException

Handles a GET request.

The default behavior is the execute the doPost method.

Overrides:

doGet in class HttpServlet

Parameters:

request - the servlet request

response - the servlet response

Throws:

ServletException

IOException

doPost

protected void doPost(HttpServletRequest request,
                      HttpServletResponse response)
               throws ServletException,
                      IOException

Handles a POST request.

The default behavior:

set the character encoding (UTF-8) if it is null

instantiate a RequestContext

authenticate credentials if found within the header

invoke the abstract "execute" method

release the request context

Overrides:

doPost in class HttpServlet

Parameters:

request - the servlet request

response - the servlet response

Throws:

ServletException

IOException

execute

protected abstract void execute(HttpServletRequest request,
                                HttpServletResponse response,
                                RequestContext context)
                         throws Exception

Processes the HTTP request.

Parameters:

request - the HTTP request

response - HTTP response

context - request context

Throws:

Exception - if an exception occurs

getCredentials

protected UsernamePasswordCredentials getCredentials(HttpServletRequest request)
                                              throws IOException,
                                                     CredentialsDeniedException

Looks for username:password credentials within the Authorization header parameter of the HTTP request.

Parameters:

request - the servlet request

Returns:

the credentials (null if none were located)

Throws:

IOException - if an IO exception occurs

CredentialsDeniedException - if empty or non-basic credentials were located

getLogger

protected Logger getLogger()

Gets the logger.

Returns:

the logger

getParameterValue

protected String getParameterValue(HttpServletRequest request,
                                   String name)

Gets a request parameter value.

Parameters:

request - the HTTP request

name - the parameter name

Returns:

ther parameter value

getRealm

protected String getRealm(RequestContext context)

Gets the identity store realm (used as an identifier during HTTP 401 credential challenge/response).

Parameters:

context - the active request context

Returns:

the identity store realm

readInputCharacters

protected String readInputCharacters(HttpServletRequest request)
                              throws IOException

Fully reads the characters from the request input stream.

Parameters:

request - the HTTP servlet request

Returns:

the characters read

Throws:

IOException - if an exception occurs

writeCharacterResponse

protected void writeCharacterResponse(HttpServletResponse response,
                                      String content,
                                      String charset,
                                      String contentType)
                               throws IOException

Writes characters to the response stream.

Parameters:

response - the servlet response

content - the content to write

charset - the response character encoding

contentType - the response content type

Throws:

IOException - if an IO exception occurs

writeHtmlResponse

protected void writeHtmlResponse(HttpServletResponse response,
                                 String content)
                          throws IOException

Convience method for writeCharacterResponse.
charset="UTF-8"
contentType="text/html; charset=UTF-8"

Parameters:

response - the servlet response

content - the content to write

Throws:

IOException - if an IO exception occurs

writeXmlResponse

protected void writeXmlResponse(HttpServletResponse response,
                                String content)
                         throws IOException

Convience method for writeCharacterResponse.
charset="UTF-8"
contentType="text/xml; charset=UTF-8"

Parameters:

response - the servlet response

content - the content to write

Throws:

IOException - if an IO exception occurs