org.paneris.melati.shopping
Class Trolley

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.melati.servlet.ConfigServlet
              org.melati.servlet.PoemServlet
                  org.melati.servlet.TemplateServlet
                      org.paneris.melati.shopping.Trolley

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class Trolley
extends org.melati.servlet.TemplateServlet

A servlet that handles the user's interaction with the Shopping Trolley.

See Also:

ShoppingTrolley, ShoppingTrolleyItem, DefaultShoppingTrolley, DefaultShoppingTrolleyItem, Serialized Form

Field Summary

MelatiShoppingConfig

config

Fields inherited from class org.melati.servlet.TemplateServlet

templateEngine

Fields inherited from class org.melati.servlet.ConfigServlet

melatiConfig, sysAdminEmail, sysAdminName

Constructor Summary

Trolley()

Method Summary

protected java.lang.String	Abandon(org.melati.Melati melati) Abandon a trolley.
protected java.lang.String	Add(org.melati.Melati melati, java.lang.Integer id, double quantity) Add a single item to the trolley, or add to the quantity already in the trolley.
protected void	assertLogin(org.melati.Melati melati) Force a user to login.
protected java.lang.String	Confirm(org.melati.Melati melati) Update the user's information and return the confirmation page.
protected java.lang.String	Details(org.melati.Melati melati) Return the page where the user enters their details.
protected java.lang.String	doTemplateRequest(org.melati.Melati melati, org.melati.template.ServletTemplateContext context) Main entry point for this servlet.
void	init(javax.servlet.ServletConfig conf) Inititialise the Shopping Trolley Engine.
protected java.lang.String	Load(org.melati.Melati melati, java.lang.Integer id) Load the trolley from something persistent.
protected java.lang.String	MultipleAdd(org.melati.Melati melati) Add multiple items to the trolley, or add to the quantities already in the trolley.
protected java.lang.String	Paid(org.melati.Melati melati) Complete the user's shopping experience, and remove their Shopping Trolley from the Session.
protected org.melati.PoemContext	poemContext(org.melati.Melati melati) Override the building of the PoemContext in order to glean the additional information required for the Shopping Trolley system.
protected java.lang.String	Remove(org.melati.Melati melati, java.lang.Integer id) Remove a single item from the trolley, the product is specified on the pathinfo which should be of the form: ///Remove/
protected java.lang.String	Save(org.melati.Melati melati) Load the trolley from something persistent.
protected java.lang.String	Set(org.melati.Melati melati, java.lang.Integer id, double quantity) Set the quantity of an item in the trolley, the product and new quantity is specified on the pathinfo which should be of the form: ////Set/
protected java.lang.String	shoppingTemplate(org.melati.Melati melati, java.lang.String name) Create the full name of the template to be returned.
protected java.lang.String	Update(org.melati.Melati melati) Update the entire trolley, changing quantities and removing items.
protected java.lang.String	View(org.melati.Melati melati) View the trolley.

Methods inherited from class org.melati.servlet.TemplateServlet

addExtension, doPoemRequest, error, prePoemSession

Methods inherited from class org.melati.servlet.PoemServlet

_handleException, dbBusyMessage, destroy, doConfiguredRequest, getSysAdminEmail, getSysAdminName, handleException, poemContextWithLDB

Methods inherited from class org.melati.servlet.ConfigServlet

doGet, doPost, melatiConfig, setSysAdminEmail, setSysAdminName, writeConnectionPendingException, writeError

Methods inherited from class javax.servlet.http.HttpServlet

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

Methods inherited from class javax.servlet.GenericServlet

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

Methods inherited from class java.lang.Object

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

Field Detail

config

public MelatiShoppingConfig config

Constructor Detail

Trolley

public Trolley()

Method Detail

init

public void init(javax.servlet.ServletConfig conf)
          throws javax.servlet.ServletException

Inititialise the Shopping Trolley Engine. This will load a file called org.paneris.melati.shopping.ShoppingTrolley.properties in order to find the classes that implement this shopping implementation.

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class org.melati.servlet.TemplateServlet

Parameters:

conf - - the Servlet's config parameters

Throws:

javax.servlet.ServletException

See Also:

MelatiShoppingConfig

doTemplateRequest

protected java.lang.String doTemplateRequest(org.melati.Melati melati,
                                             org.melati.template.ServletTemplateContext context)
                                      throws java.lang.Exception

Main entry point for this servlet.

Specified by:

doTemplateRequest in class org.melati.servlet.TemplateServlet

Parameters:

melati - - the melati for this request

context - - the Template Context for this request

Returns:

- the name of the template to be returned to the user

Throws:

org.melati.servlet.InvalidUsageException - - if this request has an invalid form

java.lang.Exception

Load

protected java.lang.String Load(org.melati.Melati melati,
                                java.lang.Integer id)
                         throws org.melati.util.InstantiationPropertyException

Load the trolley from something persistent.

Parameters:

melati - - the melati for this request

id - - an id that can be used to identify the trolley to be loaded

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Save

protected java.lang.String Save(org.melati.Melati melati)
                         throws org.melati.util.InstantiationPropertyException

Load the trolley from something persistent.

Parameters:

melati - - the melati for this request

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

View

protected java.lang.String View(org.melati.Melati melati)
                         throws org.melati.util.InstantiationPropertyException

View the trolley.

Parameters:

melati - - the melati for this request

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - if we cannot construct the trolley

Update

protected java.lang.String Update(org.melati.Melati melati)
                           throws org.melati.util.InstantiationPropertyException

Update the entire trolley, changing quantities and removing items. The POSTed form is analysed for fields with names of the form: trolleyitem__quantity - the new quantity of the item (if set) trolleyitem__deleted - remove this item from the trolley (if set) items will also be deleted if the quantity is set to 0

Parameters:

melati - - the melati for this request

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - if we cannot construct the trolley

MultipleAdd

protected java.lang.String MultipleAdd(org.melati.Melati melati)
                                throws org.melati.util.InstantiationPropertyException

Add multiple items to the trolley, or add to the quantities already in the trolley. The POSTed form is analysed for fields with names of the form: product_ - the id of the item to be added quantity_ - the quantity to add If no quantity is set, a single item will be added.

Parameters:

melati - - the melati for this request

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Add

protected java.lang.String Add(org.melati.Melati melati,
                               java.lang.Integer id,
                               double quantity)
                        throws org.melati.util.InstantiationPropertyException

Add a single item to the trolley, or add to the quantity already in the trolley. The product is specified on the pathinfo which should be of the form: ////Add/ if no quantity is set, a single item will be added. The form parmaeters will be parsed to see if they contain "price" and/or "description" fields. if they are present, they will be used to set up the item

Parameters:

melati - - the melati for this request

id - - the id of the item to be added

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Remove

protected java.lang.String Remove(org.melati.Melati melati,
                                  java.lang.Integer id)
                           throws org.melati.util.InstantiationPropertyException

Remove a single item from the trolley, the product is specified on the pathinfo which should be of the form: ///Remove/

Parameters:

melati - - the melati for this request

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Set

protected java.lang.String Set(org.melati.Melati melati,
                               java.lang.Integer id,
                               double quantity)
                        throws org.melati.util.InstantiationPropertyException

Set the quantity of an item in the trolley, the product and new quantity is specified on the pathinfo which should be of the form: ////Set/

Parameters:

melati - - the melati for this request

id - - the id of the item to be removed

Returns:

- "Trolley" - the page where users manipulate their Shopping Trolley

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Details

protected java.lang.String Details(org.melati.Melati melati)
                            throws org.melati.util.InstantiationPropertyException

Return the page where the user enters their details.

Parameters:

melati - - the melati for this request

Returns:

- "Details" - the page where users enter their details

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Confirm

protected java.lang.String Confirm(org.melati.Melati melati)
                            throws org.melati.util.InstantiationPropertyException

Update the user's information and return the confirmation page.

Parameters:

melati - - the melati for this request

Returns:

- "Confirm" - the page where users confirm their order

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Paid

protected java.lang.String Paid(org.melati.Melati melati)
                         throws org.melati.util.InstantiationPropertyException

Complete the user's shopping experience, and remove their Shopping Trolley from the Session. If you need to do something (like send an email) following confirmation of payment, define the method in ShoppingTrolley.java: public void confirmPayment(Melati melati) {} Because the callback request (typically) comes from the Payment Server, you will not have the user's shoping trolley (Session) available to them. You will therefore need to get whatever information you require from something persistent. The alternative is to get the Payment Server to generate the emails (or whatever) for you. Most Payment Servers offer this facility.

Parameters:

melati - - the melati for this request

Returns:

- "Paid" - a message thanking the user for their order

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

Abandon

protected java.lang.String Abandon(org.melati.Melati melati)
                            throws org.melati.util.InstantiationPropertyException

Abandon a trolley.

Parameters:

melati - - the melati for this request

Returns:

- "Trolley" - the initial trolley page

Throws:

org.melati.util.InstantiationPropertyException - - if we cannot construct trolley

assertLogin

protected void assertLogin(org.melati.Melati melati)
                    throws org.melati.util.InstantiationPropertyException

Force a user to login.

Parameters:

melati - - the melati for this request

Throws:

org.melati.util.InstantiationPropertyException

shoppingTemplate

protected java.lang.String shoppingTemplate(org.melati.Melati melati,
                                            java.lang.String name)

Create the full name of the template to be returned.

Parameters:

melati - - the melati for this request (not used)

name - - the name of the template

Returns:

- the full path to the template

poemContext

protected org.melati.PoemContext poemContext(org.melati.Melati melati)
                                      throws org.melati.servlet.PathInfoException

Override the building of the PoemContext in order to glean the additional information required for the Shopping Trolley system.

Overrides:

poemContext in class org.melati.servlet.PoemServlet

Parameters:

melati - - the melati for this request

Returns:

- the ShoppingContext with as many bits set up as possible

Throws:

org.melati.servlet.PathInfoException - - if we don't understand the PathInfo