atg.repository.servlet
Class NavHistoryCollector

java.lang.Object
  atg.nucleus.logging.VariableArgumentApplicationLoggingImpl
      atg.nucleus.GenericService
          atg.nucleus.TimedOperationService
              atg.nucleus.servlet.ServletService
                  atg.nucleus.servlet.HttpServletService
                      atg.servlet.DynamoServlet
                          atg.repository.servlet.NavHistoryCollector

All Implemented Interfaces:

NameContextBindingListener, NameContextElement, NameResolver, AdminableService, ApplicationLogging, atg.nucleus.logging.ApplicationLoggingSender, atg.nucleus.logging.TraceApplicationLogging, VariableArgumentApplicationLogging, ComponentNameResolver, Service, ServiceListener, ParameterServlet, java.util.EventListener, javax.servlet.Servlet

public class NavHistoryCollector
extends DynamoServlet

This droplet is what you would use to throw down a trail of breadcrumbs that will show the user the way that he has navigated your site to arrive at the page he is on. On each page on which you would like him to throw down a breadcrumb, just invoke this servlet with the item to use as a breadcrumb and the action to perform on the breadcrumb stack.

We will keep track of the path that the user has traversed from the top of the site to the current location. We will keep a stack of locations visited and move items on and off that stack as needed to keep the list a concise path from user's current position to the "top" of the site. There are 4 ways that a user can move:

1. When the user navigates in the forward direction or down the hierarchy, we push another item on the stack.
2. When he navigates up the hierarchy by clicking on breadcrumb or another navigational item, we will pop the appropriate number of items off the stack.
3. If the user hits the back button one or more times and then resumes navigation we are able to recognize that and reset the navigation path, so that we will add breadcrumbs from the position at which navigation was resumed rather than the farthest point the user reached.
4. Finally, if the user jumps to an unrelated area of the site, as if by a global navigation or some other link, we can jump to that area. If there is a default navigation path to the page jumped to, as in a hierarchical structure, that will be filled in. However, to have anything filled in you must extend this class and implement the getDefaultHistory() method as appropriate to your repository structure.

   The following input parameters may be passed to NavHistoryCollector:

   navAction (optional)

   Set this to the action you would like to take. Choices are "push", "pop", and "jump". An unset navAction will be treated as "push".

   navCount (requred)

   This parameter is used to detect when the back button has been used. We compare the value of this parameter to the value stored with the breadcrumb stack. If the backbutton is used, then we will reset the breadcrumb stack.

   item (either this or itemName must be specified)

   This is the item to add to the breadcrumb stack.

   itemName (may be used in place of item)

   The name of the current page that will be used as anchor text in a link back to the current page when it appears in the breadcrumbs.

   NavHistoryCollector has no output parameters.

   See Also:

   NavHistory

   Field Summary

   static java.lang.String	CLASS_VERSION Class version string
   static ParameterName	ITEM
   static ParameterName	ITEM_NAME
   protected ComponentName	mNavHistoryPath
   static ParameterName	NAV_ACTION
   static ParameterName	NAV_COUNT

   Fields inherited from class atg.servlet.DynamoServlet

   mAllowCleanupRequest, mParameters

   Fields inherited from class atg.nucleus.servlet.ServletService

   SERVLET_INFO_KEY

   Fields inherited from class atg.nucleus.GenericService

   SERVICE_INFO_KEY

   Fields inherited from interface atg.nucleus.logging.TraceApplicationLogging

   DEFAULT_LOG_TRACE_STATUS

   Fields inherited from interface atg.nucleus.logging.ApplicationLogging

   DEFAULT_LOG_DEBUG_STATUS, DEFAULT_LOG_ERROR_STATUS, DEFAULT_LOG_INFO_STATUS, DEFAULT_LOG_WARNING_STATUS

   Constructor Summary

   NavHistoryCollector()
   

   Method Summary

   java.lang.String	getNavHistoryPath() Returns property NavHistoryPath
   void	service(DynamoHttpServletRequest pRequest, DynamoHttpServletResponse pResponse) Look for the RepositoryItem and if found render the output oparam by binding the item as a parameter.
   void	setNavHistoryPath(java.lang.String pNavHistoryPath) Sets property NavHistoryPath

   Methods inherited from class atg.servlet.DynamoServlet

   doDelete, doGet, doPost, doPut, getParameter, getParameters, getServletContext, service, service, setParameter

   Methods inherited from class atg.nucleus.servlet.ServletService

   destroy, getServletConfig, getServletInfo, init, setServletInfo

   Methods inherited from class atg.nucleus.TimedOperationService

   getAverageRequestHandlingTime, getHandledRequestCount, getRequestStartTime, getTotalRequestHandlingTime, isKeepingStatistics, notifyHandledRequest, resetStatistics, setKeepingStatistics

   Methods inherited from class atg.nucleus.GenericService

   addLogListener, createAdminServlet, doStartService, doStopService, getAbsoluteName, getAdminServlet, getLoggingForVlogging, getLogListenerCount, getLogListeners, getName, getNameContext, getNucleus, getRoot, getServiceConfiguration, getServiceInfo, isLoggingDebug, isLoggingError, isLoggingInfo, isLoggingTrace, isLoggingWarning, isRunning, logDebug, logDebug, logDebug, logError, logError, logError, logInfo, logInfo, logInfo, logTrace, logTrace, logTrace, logWarning, logWarning, logWarning, nameContextElementBound, nameContextElementUnbound, removeLogListener, resolveName, resolveName, resolveName, resolveName, sendLogEvent, setLoggingDebug, setLoggingError, setLoggingInfo, setLoggingTrace, setLoggingWarning, setNucleus, setServiceInfo, startService, stopService

   Methods inherited from class atg.nucleus.logging.VariableArgumentApplicationLoggingImpl

   vlogDebug, vlogDebug, vlogDebug, vlogDebug, vlogError, vlogError, vlogError, vlogError, vlogInfo, vlogInfo, vlogInfo, vlogInfo, vlogTrace, vlogTrace, vlogTrace, vlogTrace, vlogWarning, vlogWarning, vlogWarning, vlogWarning

   Methods inherited from class java.lang.Object

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

   Field Detail

   CLASS_VERSION

   public static java.lang.String CLASS_VERSION

   Class version string

   NAV_ACTION

   public static final ParameterName NAV_ACTION

   NAV_COUNT

   public static final ParameterName NAV_COUNT

   ITEM_NAME

   public static final ParameterName ITEM_NAME

   ITEM

   public static final ParameterName ITEM

   mNavHistoryPath

   protected ComponentName mNavHistoryPath

   Constructor Detail

   NavHistoryCollector

   public NavHistoryCollector()

   Method Detail

   setNavHistoryPath

   public void setNavHistoryPath(java.lang.String pNavHistoryPath)

   Sets property NavHistoryPath

   getNavHistoryPath

   public java.lang.String getNavHistoryPath()

   Returns property NavHistoryPath

   service

   public void service(DynamoHttpServletRequest pRequest,
                       DynamoHttpServletResponse pResponse)
                throws javax.servlet.ServletException,
                       java.io.IOException

   Look for the RepositoryItem and if found render the output oparam by binding the item as a parameter. If no item can be found render the empty oparam.

   Overrides:

   service in class DynamoServlet

   Parameters:

   pRequest - the request to be processed

   pResponse - the response object for this request

   Throws:

   javax.servlet.ServletException - an application specific error occurred processing this request

   java.io.IOException - an error occurred reading data from the request or writing data to the response.