Java code-generation : How to modify an existing java file method?

+2 A:

You can use some byte-code manipulation library, e.g. JavaAssist. See section 4.2 Altering a method body in tutorial for javaassist : http://www.csg.is.titech.ac.jp/~chiba/javassist/tutorial/tutorial2.html

uthark 2010-02-10 15:11:20

@uthark: "source code instrumentation" != "byte code instrumentation". The original specifically talks about src code and AST so suggesting byte code instrumentation doesn't look correct.

Webinator 2010-02-10 15:20:29

@uthark: oops sorry, I misread the question, he's actually after byte code instrumentation. somehow I thought he was after source code instrumentation.

Webinator 2010-02-10 15:27:50

@uthark JavaAssist, doesn't work for java 1.5 :-(

Jay 2010-02-11 06:33:37

A:

You might look into asm.

fastcodejava 2010-02-10 15:13:19

A:

You can achieve code generation using JET templates or write custom annotation processors. Note: on a different note, Aspect oriented frameworks realise this using a concept called as code weaving , when the point-cuts are defined.

questzen 2010-02-10 15:21:01

A:

If you want to modify a source code file, you need a program transformation system. The DMS Software Reengineering Toolkit is a program transformation tool that will read source code, build compiler data structures (ASTs, symbol tables, flow graphs), allow you to apply source-to-source rewrites to the code represented as those structures, using source patterns to match/replace, and then regenerate valid source from the result.

DMS has parser/prettyprinters for many languages, including Java, C, C++, C#, COBOL, PHP, JavaScript, ...

Ira Baxter 2010-02-14 08:59:23

ansaurus

tags:

views:

answers:

Java code-generation : How to modify an existing java file method?

related questions