Reading class property name and value in Aspectj advice

Question

Is it possible to read the class property name and value in Aspectj advice while having the properties as the pointcuts. Below is the code snippet .

JAVA code:

package com.test;

public class Test {
    static List<String> list;
    static List<String> removeList;
    public static void main(String[] args) {
        list = new ArrayList<String>();
        list.add("ashish");
        removeList = new ArrayList<String>();
        removeList.add("kumar");
    }
}

AspectJ code:

package com.test;

public aspect AspectjTest {
    pointcut callAdd(): within(com.test.*) && call(* java.util.List.add(..));

    boolean around() : callAdd() {
        //code to get the property name and property value(i.e. the value going to be added to the list)
        return true;
    }
}

Answer 1

You should bind the method parameter to a variable via args() like this:

package com.test;

import java.util.List;

public aspect AspectjTest {
    pointcut callAdd(Object element) :
        within(com.test.*) &&
        call(boolean List.add(*)) &&
        args(element);

    boolean around(Object element) : callAdd(element) {
        System.out.println(thisJoinPoint + " -> " + element);
        return proceed(element);
    }
}

Console log:

call(boolean java.util.List.add(Object)) -> ashish
call(boolean java.util.List.add(Object)) -> kumar

Feel free to ask follow-up questions if you do not understand this.

---

Update: What I mean by refactoring is something like what Eclipse does for you (or any other decent IDE in a similar way) when you use menu option "Source", "Generate delegate methods". The result is something like this:

package com.test;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class NameDatabase {
    private final List<String> firstNames = new ArrayList<String>();
    private final List<String> lastNames = new ArrayList<String>();

    public boolean addFirstName(String e) {
        return firstNames.add(e);
    }

    public boolean removeFirstName(Object o) {
        return firstNames.remove(o);
    }

    public Stream<String> streamFirstNames() {
        return firstNames.stream();
    }

    public boolean addLastName(String e) {
        return lastNames.add(e);
    }

    public boolean removeLastName(Object o) {
        return lastNames.remove(o);
    }

    public Stream<String> streamLastNames() {
        return lastNames.stream();
    }

    public static void main(String[] args) {
        NameDatabase database = new NameDatabase();
        database.addFirstName("Galileo");
        database.addLastName("Galilei");
        database.addFirstName("Isaac");
        database.addLastName("Newton");
        database.addFirstName("Albert");
        database.addLastName("Einstein");
        database.addFirstName("Werner");
        database.addLastName("Heisenberg");
        database.addFirstName("Stephen");
        database.addLastName("Hawking");

        database.removeFirstName("Werner");
        database.removeLastName("Heisenberg");

        System.out.println(database.streamFirstNames().collect(Collectors.joining(", ")));
        System.out.println(database.streamLastNames().collect(Collectors.joining(", ")));
    }
}

Corresponding aspect:

package com.test;

public aspect NameDBContentAuditor {
    before(String name) :
        execution(public * NameDatabase.*stName(*)) &&
        args(name)
    {
        System.out.println(thisJoinPoint + " -> " + name);
    }
}

Console log:

execution(boolean com.test.NameDatabase.addFirstName(String)) -> Galileo
execution(boolean com.test.NameDatabase.addLastName(String)) -> Galilei
execution(boolean com.test.NameDatabase.addFirstName(String)) -> Isaac
execution(boolean com.test.NameDatabase.addLastName(String)) -> Newton
execution(boolean com.test.NameDatabase.addFirstName(String)) -> Albert
execution(boolean com.test.NameDatabase.addLastName(String)) -> Einstein
execution(boolean com.test.NameDatabase.addFirstName(String)) -> Werner
execution(boolean com.test.NameDatabase.addLastName(String)) -> Heisenberg
execution(boolean com.test.NameDatabase.addFirstName(String)) -> Stephen
execution(boolean com.test.NameDatabase.addLastName(String)) -> Hawking
execution(boolean com.test.NameDatabase.removeFirstName(Object)) -> Werner
execution(boolean com.test.NameDatabase.removeLastName(Object)) -> Heisenberg
Galileo, Isaac, Albert, Stephen
Galilei, Newton, Einstein, Hawking