A file filter reads an input file, transforms it in some way, and writes the results to an out-put file. Write an abstract file filter class that defines a pure virtual function for transforming a character. Create one derived class of your file filter class that performs encryption, another that transforms a file to all uppercase, and another that creates an unchanged copy of the original file. The class should have the following member function:
void doFilter(ifstream &in, ofstream &out);
This function should be called to perform the actual filtering. The member function for transforming a single character should have the prototype: char transform(char ch)
The encryption class should have a constructor that takes an integer as an argument and uses it as the encryption key.
Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks
#include<iostream>
#include<fstream>
using namespace std;
//abstract Filter class
class Filter{
public:
//defining pure virtual function
virtual void doFilter(ifstream &in, ofstream &out)=0;
};
//EncryptionFilter class
class EncryptionFilter: public Filter{
private:
//encryption key
int key;
public:
//contstructor taking encryption key
EncryptionFilter(int k){
key=k;
}
//method to apply filter
void doFilter(ifstream &in, ofstream &out){
char ch;
//reading all characters one by one until eof
while(in.get(ch)){
//transforming ch
ch=transform(ch);
//writing to output stream
out<<ch;
}
}
//method to transform a character
char transform(char ch){
//checking if ch is lower case
if(ch>='a' && ch<='z'){
//adding key value
ch+=key;
//wrapping around if ch >'z'
if(ch>'z'){
int index=ch-'z';
ch='a'+index;
}
}
//doing the same for upper case
else if(ch>='A' && ch<='Z'){
ch+=key;
if(ch>'Z'){
int index=ch-'Z';
ch='A'+index;
}
}
return ch;
}
};
//UpperCaseFilter class
class UpperCaseFilter: public Filter{
private:
int key;
public:
UpperCaseFilter(){
}
void doFilter(ifstream &in, ofstream &out){
char ch;
while(in.get(ch)){
ch=transform(ch);
out<<ch;
}
}
char transform(char ch){
//if ch is lower case, converting to upper case
if(ch>='a' && ch<='z'){
int index=ch-'a';
ch='A'+index;
}
return ch;
}
};
//UnchangedFilter class
class UnchangedFilter: public Filter{
private:
int key;
public:
UnchangedFilter(){
}
void doFilter(ifstream &in, ofstream &out){
char ch;
while(in.get(ch)){
ch=transform(ch);
out<<ch;
}
}
char transform(char ch){
//returning ch with no changes
return ch;
}
};
int main(){
//creating objects for each Filter
EncryptionFilter encFilter(3);
UpperCaseFilter upFilter;
UnchangedFilter unchangedFilter;
//asking user to enter an input file name
cout<<"Enter input file name: "<<endl;
string filename;
cin>>filename;
//opening input file, verifying if it is opened correctly
ifstream inFile1(filename.c_str());
if(!inFile1){
cout<<"Input file not found!"<<endl;
return 0;
}
//opening three output files for writing the filtered results
ofstream outFile1("output1.txt");
ofstream outFile2("output2.txt");
ofstream outFile3("output3.txt");
//applying each filter, storing in each output file
encFilter.doFilter(inFile1,outFile1);
//resetting ifstream pointer to point to the beginning of file
inFile1.close();
inFile1.clear();
inFile1.open(filename);
upFilter.doFilter(inFile1,outFile2);
inFile1.close();
inFile1.clear();
inFile1.open(filename);
unchangedFilter.doFilter(inFile1,outFile3);
inFile1.close();
inFile1.clear();
//closing each file, saving output
outFile1.close();
outFile2.close();
outFile3.close();
return 0;
}
/*OUTPUT*/
Enter input file name:
input.txt
//input.txt
some text
in this file
some
more text
following
some text
in this file
some
more text
following
//output1.txt
vrph whbw
lq wklv iloh
vrph
pruh whbw
iroorzlqj
vrph whbw
lq wklv iloh
vrph
pruh whbw
iroorzlqj
//output2.txt
SOME TEXT
IN THIS FILE
SOME
MORE TEXT
FOLLOWING
SOME TEXT
IN THIS FILE
SOME
MORE TEXT
FOLLOWING
//output3.txt
some text
in this file
some
more text
following
some text
in this file
some
more text
following
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