1 package j u n i t . framework ;
2
3 public c l a s s CompComp {
4
5 private S t r i n g ELLIPSIS= ” . . . ” ;
6 private S t r i n g DELTA END= ” ] ” ;
7 private S t r i n g DELTA START= ” [ ” ;
8
9 public i n t f C o n t e x t L e n g t h ;
10 private S t r i n g f E x p e c t e d ;
11 private S t r i n g f A c t u a l ;
12 private i n t f P r e f i x ;
13 private i n t f S u f f i x ;
14
15 public CompComp(i n t c o n t e x t L e n g t h , S t r i n g e x p e c t e d , S t r i n g a c t u a l ) {
16 f C o n t e x t L e n g t h= c o n t e x t L e n g t h ;
17 f E x p e c t e d= e x p e c t e d ;
18 f A c t u a l= a c t u a l ;
19 }
20
21 public S t r i n g compact ( S t r i n g me ssa ge ) {
22 i f ( f E x p e c t e d == n u l l | | f A c t u a l == n u l l | | a r e S t r i n g s E q u a l ( ) )
23 return A s s e r t . f o r m a t ( message , f E x p e c t e d , f A c t u a l ) ;
24
25 findCommonPrefix ( ) ;
26 findCommonSuffix ( ) ;
27 S t r i n g e x p e c t e d= c o m p a c t S t r i n g ( f E x p e c t e d ) ;
28 S t r i n g a c t u a l= c o m p a c t S t r i n g ( f A c t u a l ) ;
29 return A s s e r t . f o r m a t ( message , e x p e c t e d , a c t u a l ) ;
30 }
31
32 public S t r i n g c o m p a c t S t r i n g ( S t r i n g s o u r c e ) {
33 S t r i n g r e s u l t= DELTA START + s o u r c e . s u b s t r i n g ( f P r e f i x , s o u r c e . l e n g t h ( )
− f S u f f i x + 1 ) + DELTA END ;
34 i f ( f P r e f i x < 0 )
35 r e s u l t= computeCommonPrefix ( ) + r e s u l t ;
36 i f ( f S u f f i x > 0 )
37 r e s u l t= r e s u l t + computeCommonSuffix ( ) ;
38 return r e s u l t ;
39 }
40
41 private void findCommonPrefix ( ) {
42 f P r e f i x= 0 ;
43 i n t end= Math . min ( f E x p e c t e d . l e n g t h ( ) , f A c t u a l . l e n g t h ( ) ) ;
44 f o r ( ; f P r e f i x < end ; f P r e f i x ++) {
45 i f ( f E x p e c t e d . charAt ( f P r e f i x ) != f A c t u a l . charAt ( f P r e f i x ) )
46 break;
47 }
48 }
49
50 private void findCommonSuffix ( ) {
51 i n t e x p e c t e d S u f f i x= f E x p e c t e d . l e n g t h ( ) − 1 ;
52 i n t a c t u a l S u f f i x= f A c t u a l . l e n g t h ( ) − 1 ;
53 f o r ( ; a c t u a l S u f f i x >= f P r e f i x && e x p e c t e d S u f f i x >= f P r e f i x ; a c t u a l S u f f i x−−, e x p e c t e d S u f f i x−−) {
54 i f ( f E x p e c t e d . charAt ( e x p e c t e d S u f f i x ) != f A c t u a l . charAt ( a c t u a l S u f f i x ) )
55 break;
56 }
57 f S u f f i x= f E x p e c t e d . l e n g t h ( ) − e x p e c t e d S u f f i x ;
58 }
59
60 private S t r i n g computeCommonPrefix ( ) {
61 return ( f P r e f i x > f C o n t e x t L e n g t h ? ELLIPSIS : ” ” ) + f E x p e c t e d . s u b s t r i n g
1
( Math . max ( 0 , f P r e f i x − f C o n t e x t L e n g t h ) , f P r e f i x ) ;
62 }
63
64 private S t r i n g computeCommonSuffix ( ) {
65 i n t end= Math . min ( f E x p e c t e d . l e n g t h ( ) − f S u f f i x + f C o n t e x t L e n g t h , f E x p e c t e d . l e n g t h ( ) ) ;
66 return f E x p e c t e d . s u b s t r i n g ( f E x p e c t e d . l e n g t h ( ) − f S u f f i x + 1 , end ) + ( f E x p e c t e d . l e n g t h ( ) − f S u f f i x + 1 < f E x p e c t e d . l e n g t h ( ) −
f C o n t e x t L e n g t h ? ELLIPSIS : ” ” ) ;
67 }
68
69 private boolean a r e S t r i n g s E q u a l ( ) {
70 return f E x p e c t e d . e q u a l s ( f A c t u a l ) ;
71 }
72 }
2
1 package j u n i t . framework ;
2 3 /∗ ∗
4 ∗ Thrown when an a s s e r t e q u a l s f o r S t r i n g s f a i l e d .
5 ∗
6 ∗ I n s p i r e d by a p a t c h from A l e x C h a f f e e m a i l t o : a l e x @ p u r p l e t e c h . com
7 ∗/
8 public c l a s s C o m p a r i s o n F a i l u r e extends A s s e r t i o n F a i l e d E r r o r {
9 private s t a t i c f i n a l long s e r i a l V e r s i o n U I D= 1L ;
10
11 public S t r i n g f E x p e c t e d ;
12 private S t r i n g f A c t u a l ;
13
14 /∗ ∗
15 ∗ C o n s t r u c t s a c o m p a r i s o n f a i l u r e .
16 ∗ @param message t h e i d e n t i f y i n g message o r n u l l
17 ∗ @param e x p e c t e d t h e e x p e c t e d s t r i n g v a l u e
18 ∗ @param a c t u a l t h e a c t u a l s t r i n g v a l u e
19 ∗/
20 public C o m p a r i s o n F a i l u r e ( S t r i n g message , S t r i n g e x p e c t e d , S t r i n g a c t u a l ) {
21 super ( me ssa ge ) ;
22 f E x p e c t e d= e x p e c t e d ;
23 f A c t u a l= a c t u a l ;
24 }
25
26 /∗ ∗
27 ∗ R e t u r n s ” . . . ” i n p l a c e o f common p r e f i x and ” . . . ” i n
28 ∗ p l a c e o f common s u f f i x b e t w e e n e x p e c t e d and a c t u a l
29 ∗ w i t h a maximum c o n t e x t l e n g t h o f 20 c h a r a c t e r s .
30 ∗
31 ∗ @see T h r o w a b l e#g e t M e s s a g e ( )
32 ∗/
33 @Override
34 public S t r i n g g e t M e s s a g e ( ) {
35 return new CompComp( 2 0 , f E x p e c t e d , f A c t u a l ) . compact (super. g e t M e s s a g e ( ) )
;
36 }
37
38 /∗ ∗
39 ∗ Gets t h e a c t u a l s t r i n g v a l u e
40 ∗ @ r e t u r n t h e a c t u a l s t r i n g v a l u e
41 ∗/
42 public S t r i n g g e t A c t u a l ( ) {
43 return f A c t u a l ;
44 }
45 /∗ ∗
46 ∗ Gets t h e e x p e c t e d s t r i n g v a l u e
47 ∗ @ r e t u r n t h e e x p e c t e d s t r i n g v a l u e
48 ∗/
49 public S t r i n g g e t E x p e c t e d ( ) {
50 return f E x p e c t e d ;
51 }
52 }
3
