Add: Minimum required Android Gradle Plugin version check (#51)

Author: Rolf-Smit

plugin/src/main/kotlin/org/neotech/plugin/rootcoverage/RootCoveragePlugin.kt

@@ -1,5 +1,6 @@
 package org.neotech.plugin.rootcoverage
 
+import com.android.build.api.AndroidPluginVersion
 import com.android.build.api.artifact.MultipleArtifact
 import com.android.build.api.dsl.BuildType
 import com.android.build.api.variant.AndroidComponentsExtension
@@ -13,12 +14,15 @@ import org.gradle.testing.jacoco.plugins.JacocoPlugin
 import org.gradle.testing.jacoco.plugins.JacocoTaskExtension
 import org.gradle.testing.jacoco.tasks.JacocoReport
 import org.neotech.plugin.rootcoverage.utilities.afterAndroidPluginApplied
+import org.neotech.plugin.rootcoverage.utilities.assertMinimumRequiredAGPVersion
 import org.neotech.plugin.rootcoverage.utilities.fileTree
 import org.neotech.plugin.rootcoverage.utilities.onVariant
 import java.io.File
 
 class RootCoveragePlugin : Plugin<Project> {
 
+    private val minimumRequiredAgpVersion = AndroidPluginVersion(7, 2).alpha(6)
+
     private lateinit var rootProjectExtension: RootCoveragePluginExtension
 
     override fun apply(project: Project) {
@@ -136,6 +140,7 @@ class RootCoveragePlugin : Plugin<Project> {
     private fun JacocoReport.addSubProjectInternal(subProject: Project) {
         // Only Android modules are supported
         val androidComponents = subProject.extensions.getByType(AndroidComponentsExtension::class.java)
+        androidComponents.assertMinimumRequiredAGPVersion(minimumRequiredAgpVersion)
 
         // Get the exact required build variant for the current sub-project.
         val buildVariant = rootProjectExtension.getBuildVariantFor(subProject)

plugin/src/main/kotlin/org/neotech/plugin/rootcoverage/utilities/AndroidGradlePluginExtensions.kt

@@ -1,10 +1,20 @@
 package org.neotech.plugin.rootcoverage.utilities
 
+import com.android.build.api.AndroidPluginVersion
 import com.android.build.api.variant.AndroidComponentsExtension
 import com.android.build.api.variant.Variant
+import org.gradle.api.GradleException
 import org.gradle.api.Project
 import org.gradle.api.plugins.AppliedPlugin
 
+fun AndroidComponentsExtension<*, *, *>.assertMinimumRequiredAGPVersion(requiredVersion: AndroidPluginVersion) {
+    if (pluginVersion < requiredVersion) {
+        throw GradleException(
+            "This version of the RootCoveragePlugin requires a minimum Android Gradle Plugin version of $requiredVersion"
+        )
+    }
+}
+
 fun Project.onVariant(variantName: String, action: (variant: Variant?) -> Unit){
     var variant: Variant? = null
     val androidComponents = extensions.getByType(AndroidComponentsExtension::class.java)