Added Scala version statistics collector.

META-INF/scala-plugin-common.xml

@@ -17,6 +17,8 @@
     </extensionPoints>
 
     <extensions defaultExtensionNs="com.intellij">
+        <statistics.usagesCollector
+                implementation="org.jetbrains.plugins.scala.statistics.ScalaApplicationUsagesCollector" />
         <lang.rearranger language="Scala" implementationClass="org.jetbrains.plugins.scala.lang.rearranger.ScalaRearranger"/>
         <compileServer.plugin classpath="scala-library.jar;compiler-settings.jar;jps/nailgun.jar;jps/scala-jps-plugin.jar;jps/sbt-interface.jar;jps/incremental-compiler.jar;jps/jline.jar"/>
         <projectTemplatesFactory implementation="org.jetbrains.plugins.scala.config.scalaProjectTemplate.ScalaProjectTemplatesFactory"/>

src/org/jetbrains/plugins/scala/statistics/ScalaApplicationUsagesCollector.scala

@@ -0,0 +1,40 @@
+package org.jetbrains.plugins.scala
+package statistics
+
+import com.intellij.internal.statistic.AbstractApplicationUsagesCollector
+import com.intellij.internal.statistic.beans.{UsageDescriptor, GroupDescriptor}
+import com.intellij.openapi.project.Project
+import java.util
+import scala.collection.mutable
+import com.intellij.openapi.module.{ModuleManager, ModuleUtil, ModuleUtilCore}
+import org.jetbrains.plugins.scala.config.ScalaFacet
+
+/**
+ * @author Alefas
+ * @since 03.03.14
+ */
+class ScalaApplicationUsagesCollector extends AbstractApplicationUsagesCollector {
+  override def getProjectUsages(project: Project): util.Set[UsageDescriptor] = {
+    val set: mutable.HashSet[UsageDescriptor] = new mutable.HashSet[UsageDescriptor]
+
+    //collecting Scala version
+    var scala_version: Option[String] = None
+    for (module <- ModuleManager.getInstance(project).getModules) {
+      ScalaFacet.findIn(module) match {
+        case Some(facet) =>
+          scala_version = Some(facet.version)
+        case _ =>
+      }
+    }
+
+    scala_version.foreach {
+      case version: String => set += new UsageDescriptor(version, 1)
+    }
+
+    import scala.collection.JavaConversions._
+    set
+
+  }
+
+  override def getGroupId: GroupDescriptor = new GroupDescriptor("Scala")
+}