RandomSubstringFactory.h

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#pragma once
 
#include <ext/algorithm>
#include <ext/random>
 
#include <exception/CommonException.h>
 
#include <string/LinearString.h>
 
namespace string {
 
namespace generate {
 
class RandomSubstringFactory {
public:
    template < class SymbolType >
    static string::LinearString < SymbolType > generateSubstring ( size_t size, const string::LinearString < SymbolType > & string );
 
};
 
template < class SymbolType >
string::LinearString < SymbolType > RandomSubstringFactory::generateSubstring ( size_t size, const string::LinearString < SymbolType > & string ) {
    if ( size > string.getContent ( ).size ( ) )
        throw exception::CommonException ( "String not long enough" );
 
    size_t begin = ext::random_devices::semirandom ( ) % ( string.getContent ( ).size ( ) - size + 1 );
 
    ext::vector < SymbolType > data ( string.getContent ( ).begin ( ) + begin, string.getContent ( ).begin ( ) + begin + size );
 
    return LinearString < SymbolType > ( string.getAlphabet ( ), data );
}
 
} /* namespace generate */
 
} /* namespace string */