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

What are dynamic testing tools, Q. What are dynamic testing tools? Explain ...

Q. What are dynamic testing tools? Explain the functions that they must support. Ans. Dynamic testing tools: 1: coverage analyzers (execution verifiers): A coverage anal

Explain the regression testing, What is regression testing? Regression...

What is regression testing? Regression testing is the re-execution of some subject texts that have previously been conducted to make sure that changes have not propagated unin

State in brief about evolutionary prototyping, Explain Evolutionary prototy...

Explain Evolutionary prototyping Objective: The principal objective of this model is to deliver the working system to the end-user. Example-AI systems. Advant

Why do dns root servers hold entries for two-level, QUESTION - Name Service...

QUESTION - Name Services (a) Illustrate with help of a diagram the results of a DNS lookup and an ARP lookup assuming we are using IPv4. (b) Why do DNS root servers hold en

What are the elements of computer based systems, What are the elements of C...

What are the elements of Computer based Systems? Software: Data structures, Computer programs, & related document Hardware: Electronic devices, inter connectivity devices, E

Define top-down testing, Define top-down testing. System developed star...

Define top-down testing. System developed starting from most general modules. Testing begins from the most general module.

Objectives of data dictionaries, Objectives of Data dictionaries:- 1)  ...

Objectives of Data dictionaries:- 1)  A standard definition of all terms in a system, that is every item of data is uniquely identified and described. 2)  Easy cross-referen

What does verification represent, What does Verification represent? Ver...

What does Verification represent? Verification shows the set of activities that are carried out to confirm that the software correctly executes the specific functionality.

What is standard enforces, Q. What is Standard enforces? Standard enfo...

Q. What is Standard enforces? Standard enforces This tool is like a code inspector; expect that the rules are generally simpler. The main distribution is that a full-blown

Write Your Message!

Captcha
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!

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