Thanks for the inputs!..it;s done. I checked the code of classExtender and
it works for me.
However, just to clear my concepts, I wanted to know, what will the snippet
below do. I am putting in comments wherever i could understand. The code is
for the setter method.
//create the factory
InstructionFactory fac = new InstructionFactory(classGen, cp);
//load the This variable as it is at the index 0
InstructionHandle ih_0 = il.append(fac.createLoad(Type.OBJECT, 0));
//what will this do??. What variable is loaded?
il.append(fac.createLoad(Type.OBJECT, 1));
il.append(fac.createFieldAccess(classGen.getClassName(), field.getName(),
Type.getType(field.getSignature()), Constants.PUTFIELD));
//create the return instrauction. But how would it know, that it is to
create the return instrauction for a particular variable??
InstructionHandle ih_5 = il.append(fac.createReturn(Type.VOID));
mg.setMaxStack();
mg.setMaxLocals();
classGen.addMethod(mg.getMethod());
il.dispose();
If you could please help me regarding the same.
Thanks and Regards,
Sapan.
-----Original Message-----
From: Mark R. Diggory [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 27, 2003 7:59 AM
To: BCEL Users List
Subject: Re: Generating method Code for setters
I have a Class in my BCEL taglibrary that constructs getters and setters
for a desired propery, your welcome to review it.
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/repast-jellytag/repast-jelly-
taglibrary/src/org/apache/commons/jelly/tags/bcel/ClassExtender.java?rev=1.1
&content-type=text/vnd.viewcvs-markup
see the createSetterMethod(...)
Also start learning to use BCELifier in the BCEL util library, the class
is a "Godsend"! You can write a demo class that has the code you what to
generate, then run it through BCELifier to see what the BCEL code would
look like to generate that Class.
-Mark
Stephen Kolaroff wrote:
> Hi
> I began my work w/ bcel with your problem.
> IBelow is a method a wrote. Investigate and enjoy:
>
> void createAccessor(ClassGen cg, Field f) {
> ConstantPoolGen cpg = cg.getConstantPool();
> int accessFlags = f.getAccessFlags();
> FieldGen fg = new FieldGen(f, cpg);
> InstructionList il = new InstructionList();
>
> String accessorName = createWrapperName(f.getName(), true);
>
> MethodGen accessor = new MethodGen(accessFlags,
> fg.getType(),
> new Type[] {},
> new String[] {},
> accessorName,
> cg.getClassName(),
> il,
> cpg);
> InstructionFactory ins = new InstructionFactory(cg, cpg);
> il.append(ins.ALOAD_0);
> il.append(ins.createGetField(cg.getClassName(), fg.getName(),
> fg.getType()));
> il.append(ins.createReturn(fg.getType()));
>
> // must be after the whole method is ready
> accessor.setMaxLocals();
> accessor.setMaxStack();
>
> cg.addMethod(accessor.getMethod());
> }
>
>
> Sapan Shah wrote:
>
>> Hi,
>>
>> I want to generate the code for a method like
>>
>> public String getName(){
>> return this.name;
>> }
>>
>> I am successful in creating the method using the MethodGen class, but
>> am not
>> able to figure out,
>> how do i create the instruction within and get an access to this and then
>> the name variable. After that, how do i pass the returnInstruction.
>> I tried using the InstructionFactory.createReturn() method, but i
>> guess, it
>> will only get the instruction. how do i get the variable on which the
>> instruction is to be executed.
>>
>> If you could please help me. Any code snippet would be highly
>> appreciated.
>>
>> Thanks and Regards,
>> ------------------------------------
>> Sapan Shah
>> Software Engineer
>> Patni Computer Systems Limited
>> A 78/9 GIDC Electronics Estate,
>> Sector 25,
>> Gandhinagar
>> mob: (+91)98240 59280
>> http://www.patni.com
>> World-Wide Partnerships. World-Class Solutions
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