Re: Method Proxy Adapter

I fixed the issue (many) with my first attempt.

I used the bytecode outline - to do all the work for me.

However is there a better way to do write a MethodProxyAdapter ?



On 17 February 2010 22:04, <[email protected]> wrote:

> I have written an addapter that essentially renames a target method by
> pre-pending an _ then creates a new method with the originall name that
> calls
> the renamed method
>
> eg:
>
> public String getName(){
> return name;
> }
>
> gets re-written as:
>
> public String _getName(){
> return name;
> }
>
> public String getName(){
> return this._getName();
> }
>
> my adapter creates:
>
> public class TestClass2
> {
>  private String name = "Test_Class_2";
>
>  public String getName() { return this._getName; }
>  public String _getName() { return this.name;
>  }
> }
>
> _getName is missing () the brackets - a noob question as to what is wrong?
> Also
> is there a better way to do this ?
>
> public class MethodProxyAdapter extends ClassAdapter {
>
>        private String matchDesc;
>        private String matchName;
>
>        public MethodProxyAdapter(ClassVisitor cv, String matchDesc, String
> matchName) {
>                super(cv);
>                this.matchDesc = matchDesc;
>                this.matchName = matchName;
>        }
>
>        @Override
>        public MethodVisitor visitMethod(int access, String name, String
> desc,
> String signature, String[] exceptions) {
>                if (matchDesc.equals(desc) && matchName.equals(name)) {
>                        System.out.println("Method Intercepted desc: " +
> desc +
> " name: " + name);
>                        String newName = "_" + name;
>                        createProxyMethod(access, name, desc, signature,
> exceptions,newName);
>                        MethodVisitor visitMethod =
> super.visitMethod(access,
> newName, desc, signature, exceptions);
>                        return visitMethod;
>                }
>                return super.visitMethod(access, name, desc, signature,
> exceptions);
>        }
>
>        private void createProxyMethod(int access, String name, String desc,
> String signature, String[] exceptions, String newName) {
>                // Honour the original method contract
>                MethodVisitor mv = cv.visitMethod(access, name, desc,
> signature, exceptions);
>                // Write the new name
>                mv.visitCode();
>                mv.visitVarInsn(Opcodes.ALOAD, 0);
>                mv.visitFieldInsn(Opcodes.GETFIELD, "this", newName,
> "()Ljava/lang/String;");
>                mv.visitInsn(Opcodes.IRETURN);
>                mv.visitMaxs(1, 1);
>                mv.visitEnd();
>        }
>
> }
>
>
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