hello,
I'm trying to realizewith Javassist a tool that can reduce an inheritance tree
into a flat class (that is, if C3 inherits from C2, which in turn inherits from
C1, I would like to suppress C1 and C2 and to augment C3 with its inherited
attributes and methods).
So, the key problem is to copy into a class (say C2) all the attributes and the
methods inherited from a super class (say C1). The real issue appears when
dealing with the constructors of C1.
Let's consider the following situation, and the two solutions I've tried to
adopt:
public class C1 {
| private int fieldc1;
| public C1(int b) {
| fieldc1 = b;
| }
| }
|
| class C2 {
| public C2(int i) { super(i); ... }
| }
|
| //-----------
| Solution1:
| //-----------
|
| C2 must be modified into:
|
| class C2 {
| private int fieldc1;
| public C2(int i, int dummy) { ... } // dummy is added. Problem1 :
how to add a parameter to C2 using Javassist, because I have evil with the use
of setAttribute.
| //
Problem 2: the use of the primitives types like (int, string, float..) for
dummy can pose a problem of conflict in the signatures
| public C2(int i) { this(i, 0); ... } // Problem 3: How to
localize the call to "super", using Javassist, in order to substitute it by
"this"
| // Problem
4: How to recognize the correct constructor of the super class (if many) which
corresponds to that call
| // Problem
5: How to replace super(i) by this(i, 0), using Javassist
| // I manage
to change "super" into "this" with setSuperClass but I am not able to modify
the signature, i.e. to change this(i) into this(i, 0)
|
| }
|
|
| //-----------
| Solution2:
| //-----------
|
| C2 must be modified into:
|
| public class C2 {
| private int fieldc1;
| public C2(int i) {
| fieldc1 = b; //Code substitution. Problem: Can we substitute
a line with a portion of source code? How, using Javassist?
| ...
| }
| }
Thank you in advance for any help.
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