Merge "Add support for nullability validation to droidstubs."

	implicits *android.Paths, implicitOutputs *android.WritablePaths) string {

	var flags string

	if Bool(d.properties.Annotations_enabled) {

		if String(d.properties.Previous_api) == "" {

			ctx.PropertyErrorf("metalava_previous_api",

				"has to be non-empty if annotations was enabled!")

		}

		previousApi := ctx.ExpandSource(String(d.properties.Previous_api),

			"metalava_previous_api")

		flags += " --include-annotations"

		validatingNullability := strings.Contains(d.Javadoc.args, "--validate-nullability-from-merged-stubs")

		migratingNullability := String(d.properties.Previous_api) != ""

		if !(migratingNullability || validatingNullability) {

			ctx.PropertyErrorf("previous_api",

				"has to be non-empty if annotations was enabled (unless validating nullability)")

		}

		if migratingNullability {

			previousApi := ctx.ExpandSource(String(d.properties.Previous_api), "previous_api")

			*implicits = append(*implicits, previousApi)

		flags += " --include-annotations --migrate-nullness " + previousApi.String()

			flags += " --migrate-nullness " + previousApi.String()

		}

		if validatingNullability {

			nullabilityWarningsTxt := android.PathForModuleOut(ctx, ctx.ModuleName()+"_nullability_warnings.txt")

			*implicitOutputs = append(*implicitOutputs, nullabilityWarningsTxt)

			flags += " --nullability-warnings-txt " + nullabilityWarningsTxt.String()

		}

		d.annotationsZip = android.PathForModuleOut(ctx, ctx.ModuleName()+"_annotations.zip")

		*implicitOutputs = append(*implicitOutputs, d.annotationsZip)