Introduce tooling model for Android extensions plugin

Introduce Gradle models for plugins 'kotlin-android-extensions'.

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/AndroidSubplugin.kt

@@ -27,15 +27,18 @@ import org.gradle.api.Project
 import org.gradle.api.UnknownDomainObjectException
 import org.gradle.api.tasks.SourceSet
 import org.gradle.api.tasks.compile.AbstractCompile
+import org.gradle.tooling.provider.model.ToolingModelBuilderRegistry
+import org.jetbrains.kotlin.gradle.model.builder.KotlinAndroidExtensionModelBuilder
 import org.jetbrains.kotlin.gradle.plugin.*
 import org.jetbrains.kotlin.gradle.plugin.android.AndroidGradleWrapper
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import org.w3c.dom.Document
 import java.io.File
+import javax.inject.Inject
 import javax.xml.parsers.DocumentBuilderFactory
 
 // Use apply plugin: 'kotlin-android-extensions' to enable Android Extensions in an Android project.
-class AndroidExtensionsSubpluginIndicator : Plugin<Project> {
+class AndroidExtensionsSubpluginIndicator @Inject internal constructor(private val registry: ToolingModelBuilderRegistry) : Plugin<Project> {
     override fun apply(project: Project) {
         val extension = project.extensions.create("androidExtensions", AndroidExtensionsExtension::class.java)
 
@@ -44,6 +47,8 @@ class AndroidExtensionsSubpluginIndicator : Plugin<Project> {
                 addAndroidExtensionsRuntimeIfNeeded(project)
             }
         }
+
+        registry.register(KotlinAndroidExtensionModelBuilder())
     }
 
     private fun addAndroidExtensionsRuntimeIfNeeded(project: Project) {

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/model/builder/KotlinAndroidExtensionModelBuilder.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.model.builder
+
+import org.gradle.api.Project
+import org.gradle.tooling.provider.model.ToolingModelBuilder
+import org.jetbrains.kotlin.gradle.internal.AndroidExtensionsExtension
+import org.jetbrains.kotlin.gradle.model.KotlinAndroidExtension
+import org.jetbrains.kotlin.gradle.model.impl.KotlinAndroidExtensionImpl
+
+/**
+ * [ToolingModelBuilder] for [KotlinAndroidExtension] models.
+ * This model builder is registered for Kapt Gradle sub-plugin.
+ */
+class KotlinAndroidExtensionModelBuilder : ToolingModelBuilder {
+
+    override fun canBuild(modelName: String): Boolean {
+        return modelName == KotlinAndroidExtension::class.java.name
+    }
+
+    override fun buildAll(modelName: String, project: Project): Any? {
+        if (modelName == KotlinAndroidExtension::class.java.name) {
+            val extension = project.extensions.getByType(AndroidExtensionsExtension::class.java)
+            return KotlinAndroidExtensionImpl(project.name, extension.isExperimental, extension.defaultCacheImplementation.optionName)
+        }
+        return null
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/model/impl/KotlinAndroidExtensionImpl.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.model.impl
+
+import org.jetbrains.kotlin.gradle.model.KotlinAndroidExtension
+import java.io.Serializable
+
+/**
+ * Implementation of the [KotlinAndroidExtension] interface.
+ */
+data class KotlinAndroidExtensionImpl(
+    private val myName: String,
+    private val myIsExperimental: Boolean,
+    private val myDefaultCacheImplementation: String?
+) : KotlinAndroidExtension, Serializable {
+
+    override fun getModelVersion(): Long {
+        return serialVersionUID
+    }
+
+    override fun getName(): String {
+        return myName
+    }
+
+    override fun isExperimental(): Boolean {
+        return myIsExperimental
+    }
+
+    override fun getDefaultCacheImplementation(): String? {
+        return myDefaultCacheImplementation
+    }
+
+    companion object {
+        private const val serialVersionUID = 1L
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/model/builder/KotlinAndroidExtensionModelBuilderTest.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.model.builder
+
+import org.jetbrains.kotlin.gradle.model.KotlinAndroidExtension
+import org.junit.Test
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class KotlinAndroidExtensionModelBuilderTest {
+    @Test
+    fun testCanBuild() {
+        val modelBuilder = KotlinAndroidExtensionModelBuilder()
+        assertTrue(modelBuilder.canBuild(KotlinAndroidExtension::class.java.name))
+        assertFalse(modelBuilder.canBuild("wrongModel"))
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/model/impl/KotlinAndroidExtensionImplTest.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.model.impl
+
+import nl.jqno.equalsverifier.EqualsVerifier
+import nl.jqno.equalsverifier.Warning
+import org.junit.Test
+
+class KotlinAndroidExtensionImplTest {
+    @Test
+    @Throws(Exception::class)
+    fun equals() {
+        EqualsVerifier.forClass(KotlinAndroidExtensionImpl::class.java).suppress(Warning.NULL_FIELDS).verify()
+    }
+}