Java: How to get the caller function name

Question

To fix a test case I need to identify whether the function is called from a particular caller function. I can\'t afford to add a boolean parameter because it would break the int

Answer 1

Another sample for android usage:

//package your.package.name;
import android.util.Log;
/*
 File name: MyDebugLog.java
*/
public class MyDebugLog {
    private static final int    index      = 4;     // <== Index in call stack array
    private static final String methodName = "Log"; // <== Name of method for public call
    private static String getCallerName() {
        String caller = "NONE";
        final StackTraceElement[] stacktrace = Thread.currentThread().getStackTrace();
        for (int i = 0; i < stacktrace.length; i++) {
            Log.e("Method ", "[" + i + "]" + stacktrace[i].getMethodName());
        }
        if (stacktrace.length >= index){
            caller = stacktrace[index].getMethodName();
        }
        return caller;
    }

    private static String getTag() {
        String tag = "NONE";
        final StackTraceElement[] stacktrace = Thread.currentThread().getStackTrace();
        for (int i = 0; i < stacktrace.length; i++) {
            Log.e("Method ", "[" + i + "]" + stacktrace[i].getMethodName());
            if (stacktrace[i].getMethodName().equals(methodName)) {
                tag = "("+stacktrace[i + 1].getFileName() + ":" + stacktrace[i + 1].getLineNumber()+")";
                return tag;
            }
        }
        return tag;
    }

    public static void Log(String message){
        Log.v(getTag(), getCallerName() + " " + message);
    }
}

Usage:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.sample_main);
            MyDebugLog.Log("XXXXX");
    }

Output:

    V/(MainActivity.java:117): onCreate XXXXX

Sample of arrays:

 getTag Sample of stacktace array:

    Method: [0]getThreadStackTrace
    Method: [1]getStackTrace
    Method: [2]getTag
    Method: [3]Log                 <== Method for external call
    ...
 getName Sample of stacktace array:
    Method: [0]getThreadStackTrace
    Method: [1]getStackTrace
    Method: [2]getCallerName
    Method: [3]Log
    Method: [4]onCreate            <== Our external method
    Method: [5]performCreate
    ...