Support main_class property in java_binary modules

Add a main_class property that will be used to generate a manifest
containing a Main-Class entry.

Test: m checkbuild
Change-Id: I0a59bb2b93cad915afd82fba708fa0f7eda2fe7a

1 files changed, 17 insertions, 2 deletions

diff --git a/java/java.go b/java/java.go
index e5218bb76..c15a62b24 100644
--- a/java/java.go
+++ b/java/java.go
@@ -309,6 +309,9 @@ type Module struct {
 	// list of extra progurad flag files
 	extraProguardFlagFiles android.Paths
 
+	// manifest file to use instead of properties.Manifest
+	overrideManifest android.OptionalPath
+
 	// list of SDK lib names that this java moudule is exporting
 	exportedSdkLibs []string
 
@@ -1193,8 +1196,8 @@ func (j *Module) compile(ctx android.ModuleContext, extraSrcJars ...android.Path
 	jars = append(jars, deps.staticJars...)
 	jars = append(jars, deps.staticResourceJars...)
 
-	var manifest android.OptionalPath
-	if j.properties.Manifest != nil {
+	manifest := j.overrideManifest
+	if !manifest.Valid() && j.properties.Manifest != nil {
 		manifest = android.OptionalPathForPath(ctx.ExpandSource(*j.properties.Manifest, "manifest"))
 	}
 
@@ -1536,6 +1539,9 @@ func TestHostFactory() android.Module {
 type binaryProperties struct {
 	// installable script to execute the resulting jar
 	Wrapper *string
+
+	// Name of the class containing main to be inserted into the manifest as Main-Class.
+	Main_class *string
 }
 
 type Binary struct {
@@ -1556,6 +1562,15 @@ func (j *Binary) HostToolPath() android.OptionalPath {
 func (j *Binary) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	if ctx.Arch().ArchType == android.Common {
 		// Compile the jar
+		if j.binaryProperties.Main_class != nil {
+			if j.properties.Manifest != nil {
+				ctx.PropertyErrorf("main_class", "main_class cannot be used when manifest is set")
+			}
+			manifestFile := android.PathForModuleOut(ctx, "manifest.txt")
+			GenerateMainClassManifest(ctx, manifestFile, String(j.binaryProperties.Main_class))
+			j.overrideManifest = android.OptionalPathForPath(manifestFile)
+		}
+
 		j.Library.GenerateAndroidBuildActions(ctx)
 	} else {
 		// Handle the binary wrapper