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java.lang.Object shared.HelperBaseCh4 shared.HelperBaseCh5 shared.HelperBaseCh6 ch7.catalog.ControllerHelper
public class ControllerHelper
The application uses two beans: catalogItem and ShoppingCart. There will be an accessor for each of these beans, so that each can be retrieved from a JSP. The copyFromSession method will need to retrieve both beans from the session. There are buttons for all the actions that can be performed on the cart.
The catalog items must be created before this application is run. Call the CreateCatalog servlet to create the database of catalog items.
Nested Class Summary |
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Nested classes/interfaces inherited from class shared.HelperBaseCh4 |
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HelperBaseCh4.SessionData |
Field Summary | |
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protected ShoppingCart<CatalogItem> |
cart
The bean for the shopping cart. |
protected CatalogItem |
item
The bean that encapsulates a catalog item. |
Fields inherited from class shared.HelperBaseCh6 |
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checked, selected |
Fields inherited from class shared.HelperBaseCh4 |
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logger, request, response |
Constructor Summary | |
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ControllerHelper(javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response)
The only constructor for this class has parameters for the request and response objects. |
Method Summary | |
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void |
copyFromSession(java.lang.Object sessionHelper)
Most of the details for retrieving data from the session are implemented in the helper base class. |
protected void |
doGet()
This method will be called by the controller to finish processing the request. |
protected void |
doPost()
This method will be called by the controller to finish processing the request. |
java.lang.Object |
getCart()
Accessor that returns the shopping cart bean. |
java.lang.Object |
getItem()
Accessor that returns the catalog item bean. |
static void |
initHibernate(boolean create)
Uses properties to set the configuration parameters for Hibernate. |
java.lang.String |
jspLocation(java.lang.String page)
Generates the full path to a JSP. |
java.lang.String |
methodAddCart()
The method that preforms the actions associated with the login button. |
java.lang.String |
methodDefault()
The method that preforms the default actions when no button is clicked. |
java.lang.String |
methodEmptyCart()
The method that preforms the actions associated with the empty cart button. |
java.lang.String |
methodProcessCart()
The method that preforms the actions associated with the process cart button.e database and used to fill the entry form. |
java.lang.String |
methodViewCart()
The method that preforms the actions associated with the view cart button. |
java.lang.String |
methodViewItem()
The method that preforms the actions associated with the view item button. |
Methods inherited from class shared.HelperBaseCh6 |
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addChecked, addChoice, addSelected, clearMaps, clearProperty, getChecked, getSelected, invokeGetter, setCheckedAndSelected, setCheckedAndSelected |
Methods inherited from class shared.HelperBaseCh5 |
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getErrors, isValid, isValidProperty, setErrors |
Methods inherited from class shared.HelperBaseCh4 |
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addHelperToSession, addHelperToSession, executeButtonMethod, executeButtonMethod, fillBeanFromRequest, invokeButtonMethod, populateThrow, writeError |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected CatalogItem item
protected ShoppingCart<CatalogItem> cart
Constructor Detail |
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public ControllerHelper(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
request
- The object that encapsulates the request
information that is needed to communicate
with the browser.response
- The object that encapsulates the response
information that is needed to communicate
with the browser.Method Detail |
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public static void initHibernate(boolean create)
create
- If there is an initilization parameter named 'create' in the
web.xml file, then its value will be sent to this method.
If it is true, then it means that the table for the
bean should be created in the database.public java.lang.Object getItem()
public java.lang.Object getCart()
public void copyFromSession(java.lang.Object sessionHelper)
copyFromSession
in class HelperBaseCh4
sessionHelper
- The object that represents the controller helper that
was added to the session in the previous request.
During each request, the controller helper is placed in the session. Before that happens, the controller helper from the previous request can be retrieved from the session. This object is retrieved in the helper base class and sent to the implementation of this abstract method.
There are two beans in this application, so both need to be copied from the session into the current class.
public java.lang.String jspLocation(java.lang.String page)
page
- The name of the JSP. This will be appended to the
path of the directory that contains the JSPs. Using
this method forces all the JSPs to be in the same
directory.
public java.lang.String methodDefault()
public java.lang.String methodAddCart()
public java.lang.String methodEmptyCart()
public java.lang.String methodViewItem()
public java.lang.String methodViewCart()
public java.lang.String methodProcessCart()
protected void doGet() throws java.io.IOException, javax.servlet.ServletException
GET requests will be treated as first requests to the application. Previous data will not be retrieved from the session and the edit page will always be displayed.
doGet
in class HelperBaseCh4
javax.servlet.ServletException
- A servlet exception is a severe error
and means that processing cannot continue.
java.io.IOException
- An IO exception is a severe error
and means that processing cannot continue.protected void doPost() throws javax.servlet.ServletException, java.io.IOException
POST requests will implement the controller logic that has been in all previous controllers.
doPost
in class HelperBaseCh4
javax.servlet.ServletException
- A servlet exception is a severe error
and means that processing cannot continue.
java.io.IOException
- An IO exception is a severe error
and means that processing cannot continue.
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