State Diagrams Forward and Reverse Engineering

Forward and Reverse Engineering 

To forward engineer a Statechart diagram,

Forward engineering for the class MessageParser is shown as 

Class MessageParser { 

Public boolean put(char c) { 

switch (state) case waiting: 

if (c == "<") 

state = GettingToken; 

token = new StringBuffer();

 body = new StringBuffer(); 

} break; 

case GettingToken : 

if (c == '>') 

state = GettingBody; 

else 

token.append(c); 

break; 

case GettingBody : 

if (c == ';') 

state = Waiting; 

else body.append(c); 

return true; 

} 

return false; 

} 

StringBuffer getToken(){ 

return token; 

} 

StringBuffer getBody(){ 

return body; 

} 

private final static int Waiting = 0; 

final static int GettingToken = 1; 

final static int GettinBody = 2;

 int state = Waiting; 

StringBuffer token. body; 

}

Forward and Reverse Engineering 

Reverse engineering a statechart diagram: 

• May not be practically useful at all, but theoretically it is possible 
• The tools available do not have the ability for abstraction to output meaningful state diagrams