How to apply differenct plugins for different product flavors in gradle?

Question

I've two product flavors in my Android project like:

productFlavors: {
 flavor1 {
  ...
 }
 flavor2 {
  ...
 }
}

I want to apply plugin based on productFlavors like this:

if (flavor1 Build Variant) {
  apply plugin: 'com.android.application'
} else {
  apply plugin: 'com.android.library'
}

I tried this:

def isFlavor1= getGradle().getStartParameter().getTaskRequests().toString().toLowerCase().contains('flavor1')

if (isFlavor1) {
  apply plugin: 'com.android.application'
} else {
  apply plugin: 'com.android.library'
}

But this doesn't solve the problem.

So, how can I apply plugin based on productFlavors?