Merge pull request #43 from DeepBlueRobotics/clean-devices-before-gen…

…eration

Clean Generated Device Files Before Regenerating Them

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-  id "com.github.node-gradle.node" version "2.2.4"
+    id "com.github.node-gradle.node" version "2.2.4"
 }
 
 apply plugin: 'java-library'
@@ -25,21 +25,26 @@ dependencies {
 
 // To please the Windows CI server (and perhaps other Windows machines),
 // the template directory needs to be passed to the asyncapi generator as
-// an archive. 
+// an archive.
 def templateDir = "${projectDir}/asyncapi-template"
 task archiveTemplate(type: Tar) {
     archiveFileName = "asyncapi-template.tar"
     destinationDirectory = file("$buildDir/tmp")
 
     from(templateDir) {
-      exclude "node_modules"
-      into "asyncapi-template" // npm requires that everything be in a top-level folder
+        exclude "node_modules"
+        into "asyncapi-template" // npm requires that everything be in a top-level folder
     }
 }
 
 // Add a task to generate java source code for the devices using npx to run
 // the asyncapi generator.
 task generateDeviceFiles(type: NpxTask) {
+    // Clean the output directory first (See #40)
+    doFirst {
+        delete outputs
+    }
+
     def outputDir = "${buildDir}/generated/sources/asyncapi"
 
     // Define the command line that npx should use
@@ -54,12 +59,16 @@ task generateDeviceFiles(type: NpxTask) {
     // when necessary.
     inputs.files(archiveTemplate.outputs)
     outputs.dir(outputDir).withPropertyName("outputDir")
-
 }
 
 // Include the generated files in the source to compile.
 sourceSets.main.java.srcDirs generateDeviceFiles.outputs
 
+// Add a task to manually clean the generated devices folder.
+task cleanDeviceFiles(type: Delete) {
+    delete generateDeviceFiles.outputs
+}
+
 // Use a version of node and npm that is known to work.
 node {
   download = true