User Account

All Pages

factory method, Software Engineering

Assignment Help:
For this assignment you will create a program called MMWordFix (Multi-Mode WordFix). This program prompts the user to select one of three word filters (uppercase, lowercase, encrypt). Then it allows the user to repeatedly apply this filter either interactively or to convert a file. Here is a sample run:


If the user tries to convert a file and the file is not found in the local directory, they should see an error message, e.g.:


If the user does not correctly enter the name of one of the filters, WordFix should continue to prompt the user until a valid selection is entered. For example,



This program builds on Hwk4.
IFilter, FUpperCase, FLowerCase, FEncrypt:
• No changes.
FilterMgr:
• Change method selectFilter to return a pointer to IFactory. Thus it creates and returns an instance of the appropriate factory (instead of filter).
IFactory:
• An interface that has method NewFilter, which takes no arguments and returns a pointer to an IFilter.
UCaseFactory, LCaseFactory, EncryptFactory:
• Each implements interface IFactory.
• Each creates a different type of filter object: FUpperCase, FLowerCase, or FEncrypt respectively.
InteractiveFix:
• Has private attribute myFilter, which is a pointer to an IFilter.
• The constructor takes a pointer to an IFactory as an argument. It uses the factory object to create a filter object, which it saves in myFilter.
• Has method DoInteractiveSession, which takes no arguments and returns nothing. This method:
o Prompts the user for a word, then accepts a word from the user.
o If the word is “q”, the method returns.
o Otherwise it executes myFilter on the word, and displays the result.
• Note that InteractiveFix should not know anything about specific factory or filter classes; it only knows about IFactory and IFilter.
FileFix:
• Has private attribute myFactory, which is a pointer to an IFactory.
• The constructor takes a pointer to an IFactory as an argument. It saves the factory object in myFactory.
• Has method ConvertFile, which takes string argument and returns nothing. The argument is the name of the input file. This method:
o Uses myFactory to create the appropriate filter object.
o Opens the input file and output file (same name but .fix suffix).
o Reads each line in the input file, converts it, and writes it to the output file.
o Closes both files.
• Note that FileFix should not know anything about specific factory or filter classes; it only knows about IFactory and IFilter.
main():
• Prompts the user for a filter name, using the FilterMgr to get the choices.
• Accepts a filter name from the user.
• If the filter name is “q”, the program quits.
• Uses the FilterMgr to get the appropriate factory object that can create the named filter. If the filter name is not one of the available filters, the user is prompted again.
• Now the user may repeatedly apply the filter in one of two modes.
o Prompt the user for the mode (“i” or “f”)
o If the mode is “q”, the program quits.
o If the mode is “i”, an InteractiveFix object is created and used to apply the filter interactively.
o If the mode is “f”, the user is prompted for a file name then a FileFix object is created and used to apply the filter to a file.
• Note that main() should not know about any of the specific factory classes; it only knows about IFactory.
• Note that main() should not know anything about filters.

Related Discussions:- factory method

Determine the level 0 and level 1 of DFD, Determine the level 0 and level 1...

Determine the level 0 and level 1 of DFD External entities provide input data for processing. During processing, some intermediate data is generated. After final processing, fi

Creating the field selection table - database definition, Creating the Fiel...

Creating the Field Selection Table (FST) : Entering of data and creating indexes for searching is a very important feature associated with any information storage and retriev

Network Technology, How can you create a file named -i? Which techniques do...

How can you create a file named -i? Which techniques do not work, and why do they not work? How can you remove the file named -i?

Allocate operations to the entity life history diagram, QUESTION 1 (a) ...

QUESTION 1 (a) Suggest how the atomicity of EV1 "Request for estimate" could be improved (b) Document any five events listed above (Tip: state the actor, system agent, input

Data Mining Question, This assignment uses the data set rent.txt, the Housi...

This assignment uses the data set rent.txt, the Housing Rent Prices in Munich file available at ">http://www.interactivegraphics.org/Datasets.html. 1.Produce a scatterplot of Re

Explain about the iterative enhancement model, Iterative Enhancement Model ...

Iterative Enhancement Model This model was developed to remove disadvantages of waterfall model. In this model, phases of software development remain the same however the cons

Linearizability and sequential consistency, QUESTION - Fault Tolerance ...

QUESTION - Fault Tolerance (a) Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a

Fact finding, fact finding examples

fact finding examples

Determine the repeatable level of maturity model, Level 2 (Repeatable) ...

Level 2 (Repeatable) Organisation satisfies all the requirements of level-1. At this stage, basic project management policies and associated procedures are established. Insti

Write down the src for add a node, Write down the SRC for "Add a node" ...

Write down the SRC for "Add a node" Function Add node Description Adds a node to an existing design. Inputs Node type, Design Identifier, Node position Source

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd