apex respects stem of java_library modules

apex now respects stem of java_library modules.

As a follow-up we need to suppor the same for other types of modules.

Exempt-From-Owner-Approval: cherry-pick from AOSP

Bug: 157638999
Test: m
Merged-In: Iaf5023020b5440f1ffd4f5414b5a7864655fc22a
(cherry picked from commit a62aa23990)
Change-Id: Iaf5023020b5440f1ffd4f5414b5a7864655fc22a

apex/apex.go

@@ -1179,6 +1179,7 @@ func (class apexFileClass) NameInMake() string {
 // apexFile represents a file in an APEX bundle
 type apexFile struct {
 	builtFile  android.Path
+	stem       string
 	moduleName string
 	installDir string
 	class      apexFileClass
@@ -1218,9 +1219,17 @@ func (af *apexFile) Ok() bool {
 	return af.builtFile != nil && af.builtFile.String() != ""
 }
 
+func (af *apexFile) apexRelativePath(path string) string {
+	return filepath.Join(af.installDir, path)
+}
+
 // Path() returns path of this apex file relative to the APEX root
 func (af *apexFile) Path() string {
-	return filepath.Join(af.installDir, af.builtFile.Base())
+	stem := af.builtFile.Base()
+	if af.stem != "" {
+		stem = af.stem
+	}
+	return af.apexRelativePath(stem)
 }
 
 // SymlinkPaths() returns paths of the symlinks (if any) relative to the APEX root
@@ -1660,11 +1669,17 @@ func apexFileForShBinary(ctx android.BaseModuleContext, sh *android.ShBinary) ap
 	return af
 }
 
-func apexFileForJavaLibrary(ctx android.BaseModuleContext, lib java.Dependency, module android.Module) apexFile {
+type javaDependency interface {
+	java.Dependency
+	Stem() string
+}
+
+func apexFileForJavaLibrary(ctx android.BaseModuleContext, lib javaDependency, module android.Module) apexFile {
 	dirInApex := "javalib"
 	fileToCopy := lib.DexJar()
 	af := newApexFile(ctx, fileToCopy, module.Name(), dirInApex, javaSharedLib, module)
 	af.jacocoReportClassesFile = lib.JacocoReportClassesFile()
+	af.stem = lib.Stem() + ".jar"
 	return af
 }
 

apex/apex_test.go

@@ -386,6 +386,7 @@ func TestBasicApex(t *testing.T) {
 		java_library {
 			name: "myjar",
 			srcs: ["foo/bar/MyClass.java"],
+			stem: "myjar_stem",
 			sdk_version: "none",
 			system_modules: "none",
 			static_libs: ["myotherjar"],
@@ -440,7 +441,7 @@ func TestBasicApex(t *testing.T) {
 	// Ensure that both direct and indirect deps are copied into apex
 	ensureContains(t, copyCmds, "image.apex/lib64/mylib.so")
 	ensureContains(t, copyCmds, "image.apex/lib64/mylib2.so")
-	ensureContains(t, copyCmds, "image.apex/javalib/myjar.jar")
+	ensureContains(t, copyCmds, "image.apex/javalib/myjar_stem.jar")
 	// .. but not for java libs
 	ensureNotContains(t, copyCmds, "image.apex/javalib/myotherjar.jar")
 	ensureNotContains(t, copyCmds, "image.apex/javalib/msharedjar.jar")

java/java.go

@@ -1880,7 +1880,7 @@ func (j *Library) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 			extraInstallDeps = j.InstallMixin(ctx, j.outputFile)
 		}
 		j.installFile = ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
-			ctx.ModuleName()+".jar", j.outputFile, extraInstallDeps...)
+			j.Stem()+".jar", j.outputFile, extraInstallDeps...)
 	}
 
 	// Verify Dist.Tag is set to a supported output
@@ -2721,7 +2721,7 @@ func (j *DexImport) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	j.maybeStrippedDexJarFile = dexOutputFile
 
 	ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
-		ctx.ModuleName()+".jar", dexOutputFile)
+		j.Stem()+".jar", dexOutputFile)
 }
 
 func (j *DexImport) DexJar() android.Path {