Allow java_system_modules_import to replace java_system_modules

Previously, there were some places where a java_system_module_import
could not be used in place of a java_system_module. That was because
the code assumed a *SystemModules type not a *systemModulesImport type.
This change introduces a SystemModulesProvider interface that is used
instead and is implemented on both types.

Bug: 142940300
Test: m nothing
      ran new tests before changes to make sure they detected the issue
	  and after to make sure the changes fixed the issue.
Change-Id: I7b16ac5708880bdf61e6f5b1e6616c986f0ed763

1 files changed, 20 insertions, 0 deletions

diff --git a/java/system_modules.go b/java/system_modules.go
index 731503fd0..47de6e327 100644
--- a/java/system_modules.go
+++ b/java/system_modules.go
@@ -117,6 +117,15 @@ func SystemModulesFactory() android.Module {
 	return module
 }
 
+type SystemModulesProvider interface {
+	HeaderJars() android.Paths
+	OutputDirAndDeps() (android.Path, android.Paths)
+}
+
+var _ SystemModulesProvider = (*SystemModules)(nil)
+
+var _ SystemModulesProvider = (*systemModulesImport)(nil)
+
 type SystemModules struct {
 	android.ModuleBase
 	android.DefaultableModuleBase
@@ -136,6 +145,17 @@ type SystemModulesProperties struct {
 	Libs []string
 }
 
+func (system *SystemModules) HeaderJars() android.Paths {
+	return system.headerJars
+}
+
+func (system *SystemModules) OutputDirAndDeps() (android.Path, android.Paths) {
+	if system.outputDir == nil || len(system.outputDeps) == 0 {
+		panic("Missing directory for system module dependency")
+	}
+	return system.outputDir, system.outputDeps
+}
+
 func (system *SystemModules) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	var jars android.Paths