Add @Generated annotation if it is available

People using error prone are having problems with data binding since
it does not generate perfect code. A good way to exclude it is using
@Generated annotation but we can only use it if app has the necessary
annotation (android.jar does not have @Generated).
This CL checks classpath to decide whether to add it or not.
Also changed test app to have it but other apps don't.

Bug: 37136286
Test: existing tests pass
Change-Id: Ie72518bc690fb98a859ac30f0940c1af18fdba6a

5 files changed, 15 insertions, 0 deletions

diff --git a/compiler/src/main/kotlin/android/databinding/tool/writer/BRWriter.kt b/compiler/src/main/kotlin/android/databinding/tool/writer/BRWriter.kt
index 885284ef..2de922e5 100644
--- a/compiler/src/main/kotlin/android/databinding/tool/writer/BRWriter.kt
+++ b/compiler/src/main/kotlin/android/databinding/tool/writer/BRWriter.kt
@@ -24,6 +24,7 @@ class BRWriter(properties: Set<String>, val useFinal : Boolean) {
     val klass: String by lazy {
         kcode("") {
             val prefix = if (useFinal) "final " else "";
+            annotateWithGenerated()
             block("public class BR") {
                 tab("public static ${prefix}int _all = 0;")
                 indexedProps.forEach {
diff --git a/compiler/src/main/kotlin/android/databinding/tool/writer/BindingMapperWriter.kt b/compiler/src/main/kotlin/android/databinding/tool/writer/BindingMapperWriter.kt
index 0caf8a6f..812d7ffe 100644
--- a/compiler/src/main/kotlin/android/databinding/tool/writer/BindingMapperWriter.kt
+++ b/compiler/src/main/kotlin/android/databinding/tool/writer/BindingMapperWriter.kt
@@ -31,6 +31,7 @@ class BindingMapperWriter(var pkg : String, var className: String, val layoutBin
         nl("package $pkg;")
         nl("import ${compilerArgs.modulePackage}.BR;")
         val extends = if (generateAsTest) "extends $appClassName" else ""
+        annotateWithGenerated()
         block("class $className $extends") {
             nl("final static int TARGET_MIN_SDK = ${compilerArgs.minApi};")
             if (generateTestOverride) {
diff --git a/compiler/src/main/kotlin/android/databinding/tool/writer/DynamicUtilWriter.kt b/compiler/src/main/kotlin/android/databinding/tool/writer/DynamicUtilWriter.kt
index ba42f23c..7d550c7e 100644
--- a/compiler/src/main/kotlin/android/databinding/tool/writer/DynamicUtilWriter.kt
+++ b/compiler/src/main/kotlin/android/databinding/tool/writer/DynamicUtilWriter.kt
@@ -11,6 +11,7 @@ class DynamicUtilWriter() {
         nl("import android.os.Build.VERSION_CODES;")
         nl("import android.databinding.BindingConversion;")
         nl("")
+        annotateWithGenerated()
         block("public class DynamicUtil") {
             val analyzer = ModelAnalyzer.getInstance();
             ModelClass.UNBOX_MAPPING.forEach {
diff --git a/compiler/src/main/kotlin/android/databinding/tool/writer/KCode.kt b/compiler/src/main/kotlin/android/databinding/tool/writer/KCode.kt
index 98438f69..e5ff7980 100644
--- a/compiler/src/main/kotlin/android/databinding/tool/writer/KCode.kt
+++ b/compiler/src/main/kotlin/android/databinding/tool/writer/KCode.kt
@@ -13,6 +13,8 @@
 
 package android.databinding.tool.writer
 
+import android.databinding.tool.reflection.ModelAnalyzer
+import android.databinding.tool.reflection.ModelAnalyzer.GENERATED_ANNOTATION
 import android.databinding.tool.util.StringUtils
 import java.util.BitSet
 
@@ -55,6 +57,13 @@ class KCode (private val s : String? = null){
         return this
     }
 
+    fun annotateWithGenerated() : KCode {
+        if (ModelAnalyzer.getInstance().hasGeneratedAnnotation()) {
+            nl("@${GENERATED_ANNOTATION}(\"Android Data Binding\")")
+        }
+        return this
+    }
+
     fun tab(s : String?, init : (KCode.() -> Unit)? = null) : KCode {
         val c = KCode(s)
         if (init != null) {
diff --git a/compiler/src/main/kotlin/android/databinding/tool/writer/LayoutBinderWriter.kt b/compiler/src/main/kotlin/android/databinding/tool/writer/LayoutBinderWriter.kt
index 4de90a02..673505d7 100644
--- a/compiler/src/main/kotlin/android/databinding/tool/writer/LayoutBinderWriter.kt
+++ b/compiler/src/main/kotlin/android/databinding/tool/writer/LayoutBinderWriter.kt
@@ -355,6 +355,7 @@ class LayoutBinderWriter(val layoutBinder : LayoutBinder) {
                 classDeclaration = "$className extends android.databinding.ViewDataBinding"
             }
             nl("@SuppressWarnings(\"unchecked\")")
+            annotateWithGenerated()
             block("public class $classDeclaration ${buildImplements()}") {
                 nl(declareIncludeViews())
                 nl(declareViews())
@@ -695,6 +696,7 @@ class LayoutBinderWriter(val layoutBinder : LayoutBinder) {
     }
 
     fun declareSetVariable() = kcode("") {
+        nl("@Override")
         nl("public boolean setVariable(int variableId, @Nullable Object variable) {") {
             tab("switch(variableId) {") {
                 variables.forEach {
@@ -1249,6 +1251,7 @@ class LayoutBinderWriter(val layoutBinder : LayoutBinder) {
             nl("import android.databinding.ViewDataBinding;")
             nl("import android.support.annotation.NonNull;")
             nl("import android.support.annotation.Nullable;")
+            annotateWithGenerated()
             nl("public abstract class $baseClassName extends ViewDataBinding {")
             layoutBinder.sortedTargets.filter{it.id != null}.forEach {
                 if (variations.count{lb -> lb.sortedTargets.any {bt -> bt.isUsed && bt.id == it.id && bt.includedLayout == null}} == variations.size) {