Download Class diagram

Class diagram extraction
Mariano Ceccato
ITC-Irst
Istituto per la ricerca
Scientifica e Tecnologica
[email protected]
16/03/2007
Class diagram extraction
1
Exercise
Given a Java program build the Class Diagram (associations,
extends, attributes) of it.
Class A
int x, y
Class B
Class C extend B
Aa
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C
a
extends
uses
A
x, y
Class diagram extraction
B
2
Dotty
 Dotty is a customizable graph editor.
 The dotty language is intuitive.
 http://hoagland.org/Dot.html
digraph g {
A [shape = “record”, label = “{A | x, y}”];
C [shape = “record”, label = “{C | a}”];
C -> A [label=“uses”];
C -> B [label=“extends”];
}
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Exercise: step by step
1.
2.
3.
4.
5.
6.
7.
8.
Give a look at http://hoagland.org/Dot.html
Download dotty at http://www.graphviz.org/Download_windows.php
Install Dotty
Download the java grammar http://sra.itc.it/people/ceccato/couses/lsa
Download the dotty grammar http://sra.itc.it/people/ceccato/couses/lsa
Test it with small examples
Implement in TXL the “getClassNames.txl” (print class names)
Implement in TXL the “TransformClassNamesInDotty.txl”
(implement dot.Grm)
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The “Dot” language
 Dot is a language that can be used to draw graphs and
directed graphs.
 The syntax is very intuitive
 Download the language manual here:
http://www.graphviz.org/
digraph
a ->
a ->
b ->
b ->
}
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g
b
c
c
d
{
;
;
;
;
a
d
b
c
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The “Dot” language
digraph G {
main -> parse -> execute;
main -> init;
main -> cleanup;
execute -> make_string;
execute -> printf
init -> make_string;
main -> printf;
execute -> compare;
}
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The “Dot” language
digraph G {
a -> b;
b -> c;
b -> d [style="dashed"];
a [shape="box", color="blue",style="filled"];
c [label="hello world"];
d [shape="record", label="{1|2|3}"];
e [shape="record", label="a|b|c\nd|{e|f}"];
}
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Reverse Engineering
 TXL can be used to extract design information from
the code.
 Such information is then translated in Dot and then
visualized
B
class A {
int x, y;
}
class B {
}
A
class C extends B {
A a;
}
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int x
int y
Class diagram extraction
C
Aa
8
Just one source file
Join all the source files in one huge file
 Not always possible, because for some languages source file
names have semantics (e.g. Java).
 When possible it causes loss of the information about the
actual source location, loss of modularity.
class A{ int x, y; }
class B { }
class C extends B{ A a; }
test.java
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Class diagram extraction
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Reverse Engineering
 Extract the UML class diagram using TXL and
represent it in Dot:
B
class A {
int x, y;
}
class B {
}
A
int x
int y
class C extends B {
A a;
}
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Class diagram extraction
C
Aa
10
class A{ int x, y; }
class B { }
class C extends B{ A a; }
digraph CLASS {
node [shape = "record"];
A [label = "A"] ;
B [label = "B"] ;
C [label = "C"] ;
C -> B ;
C -> A ;
}
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class A{ int x, y; }
class B { }
class C extends B{ A a; }
digraph CLASS {
node [shape = "record"];
A [label = "A"] ;
B [label = "B"] ;
C [label = "C"] ;
C -> B [arrowhead = "vee"] ;
C -> A [arrowhead = "onormal"];
}
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class A{ int x, y; }
class B { }
class C extends B{ A a; }
digraph CLASS {
rankdir = "BT";
node [shape = "record"];
A [label = "{A|int x;\nint y;}"] ;
B [label = "{B}"] ;
C [label = "{C|A a;}"] ;
C -> B [arrowhead = "vee"];
C -> A [arrowhead = "onormal"];
}
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Exercise
1.
2.
3.
4.
Extract the class manes from one small example.
Extract the class manes from the big case study.
Extract the UML class diagram from the small example.
Extract the UML class diagram from the case study:





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Generalization (“extends” relations)
Associations (“contains” relations)
Attributes (fields)
Dependencies (“uses” relations)
Operations (method)
Class diagram extraction
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UML
a -> b [arrowhead = "onormal"];
a -> b [arrowhead = "vee"] ;
 Generalization: relation between
a general class and a more
specific one (subclass or child)
 Association: structural
relationship (a class is used as an
attribute)
 Dependency: using relationship
(a class is used in an operation
signature)
a -> b [arrowhead = "vee", style="dashed"];
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Java.Grm
Dotty.Grm
define program
[repeat java_source]
end define
define program
[repeat graph]
end define
define java_source]
[package_declaration]
end define
define graph
[opt 'strict] 'graph [id]
'{ [repeat stmt] '}
| [opt 'strict] 'digraph [id]
'{ [repeat stmt] '}
end define
define package_declaration
[opt package_header]
[repeat import_declaration]
[repeat type_declaration]
end define
define stmt
[attrStmt] [opt ';]
| [nodeStmt] [opt ';]
define package_header
| [edgeStmt] [opt ';]
'package [package_name] ';
| [subgraph] [opt ';]
end define
| [id] '= [id] [opt ';]
end define
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Java.Grm
Dotty.Grm
include “Java.Grm”
define java_program
define dotty_program
include “Dotty.Grm”
[repeat java_source]
[repeat graph]
end define
end define
define program
[java_program]
define java_source]
define graph
| [dotty_program]
[package_declaration]end define
[opt 'strict] 'graph [id]
end define
'{ [repeat stmt] '}
| [opt 'strict] 'digraph [id]
define package_declaration
'{ [repeat stmt] '}
rule main
[opt package_header]
end define
replace [program]
[repeat import_declaration]
[repeat type_declaration] code [java_program]
define stmt
…
end define
[attrStmt] [opt ';]
construct graph [dotty_program]
| [nodeStmt] [opt ';]
…
define package_header
| [edgeStmt] [opt ';]
by
'package [package_name]
';
| [subgraph] [opt ';]
graph
end define
| [id] '= [id] [opt ';]
end rule
end define
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