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Re: [aspectj-users] help required in introducing new method
|
Hi Ravi,
if you need to access fields/getters dynamically then reflection is the
only way to go.
Suppose I have these classes :
public class User {
private String name;
private String surname;
// Getters/setters etc..
}
public class Order {
private String orderId;
private String address;
// Getters/setters etc..
}
Then I cannot write a single method that creates a to-string of these
two classes if not using reflection. AspectJ can help writing that
method only once and then introducing it in all your (and not your) classes.
Simone
Ravi Chandra wrote:
hi,
Thank you for replaying.
"The second one is that you are declaring the toString on
"SomeInterface" and then using field1, field2 etc.. Make sure those
fields are declared on the class,"
I require the AspectJ to read all the declared fields(ideally only
annotated fields) and generate the toString for it or read the public
getters and generate the same. The field1 field2 etc are taken as an
example. There can be fields other than this also. i need all of them
printed in the toString.
I added SomeInterface as parent because, thats the only way i figured
the method can be added to all classes in com.comp.dto.*; i am not
sure if there is a better way to do this.
i suppose i am clear.
regards,
ravi
On Tue, Sep 15, 2009 at 1:56 PM, Simone Gianni <simoneg@xxxxxxxxxx
<mailto:simoneg@xxxxxxxxxx>> wrote:
Hi Ravi,
you don't specify which error is blocking you, so I'll assume two
possibilities.
The first one is that fields you are trying to access are private,
so not visible from the aspect that is declaring the method. This
can be solved using "public privileged aspect". The "privileged"
keyword gives the aspect rights to access private members.
The second one is that you are declaring the toString on
"SomeInterface" and then using field1, field2 etc.. Make sure
those fields are declared on the class, AspectJ is subject to the
same checks a normal class is, so if you declare a method on an
interface, that method will be able to access other methods/fields
in that interface or super interfaces.
Hope this helps,
Simone
Ravi Chandra wrote:
hi,
My problem is equivalent to implementing toString mehtod of a
class. *The output should be like: fieldVariable1= val1 |
fieldVariable2= val2 |... etc. I could introduce the toString
method but am unable to read the field variables and print
them. *Below is the approach i used.
public aspect INAspect *{*
// INTRODUCTION
public String SomeInterface.toString(byte[] bytes) {
String s="";
*// s = 'field1='+ this.field1 + 'field2=' + this.field2
| ... etc*
return s;
}
// SYNTHETIC IMPLEMENTS
declare parents: com.comp.attributes.* implements
SomeInterface;
*}*
---
package com.comp.attributes;
public class UserAttributes *{*
private String field1 = "abc";
private int field2 = 100;
... getters and setters...
* //here toString() should be introduced that is like
// "field1="+ this.field1+ "field2="+ this.field2 etc.
}*
------
when i decompile the code of user attibutes it is showing hte
toString implemented. except for reflections (which is not
prefered to be used) i want to know if there is a way to get
this achieved. I tried with AJType; but no luck.
Any ideas/ pointers please.
ravi
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Simone Gianni CEO Semeru s.r.l. Apache Committer
http://www.simonegianni.it/
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aspectj-users mailing list
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--
Simone Gianni CEO Semeru s.r.l. Apache Committer
http://www.simonegianni.it/