how to tell which build tool is used for the current project? Maven or Gradle

Is there a way to tell which build tool is used for the current project?

And once we determined whether it is a maven or gradle project, how to execute maven/gradle build instead of the generic make from IntelliJ?

Currently I use the following method to compile the project, but the problem is that for Gradle projects, this will generate "out" folder instead of "build" folder:

CompilerManager.getInstance(getProject()).make(

Thanks.