java_sdk_library_import - expose system and test stubs

Previously, the java_sdk_library_import only exposed the public stubs.
This change adds support for exposing system and test stubs too by adding
separate structures for public, system and test scopes. The existing
properties are kept for legacy reasons (and because libs can be common
across the differents scopes).

It extracts some code that is common to both sdk library and sdk
library import.

The legacy support will be removed in a future change once all existing
usages have been switched over.

Bug: 148080325
Test: m droid
      TARGET_BUILD_APPS=Camera2 m
Change-Id: I0b26cc8af9ee044437ff3b80c1eca611816b9386

java/java_test.go

@@ -458,7 +458,7 @@ func TestPrebuilts(t *testing.T) {
 		java_library {
 			name: "foo",
 			srcs: ["a.java", ":stubs-source"],
-			libs: ["bar", "sdklib"],
+			libs: ["bar", "sdklib", "sdklib-legacy"],
 			static_libs: ["baz"],
 		}
 
@@ -478,10 +478,17 @@ func TestPrebuilts(t *testing.T) {
 		}
 
 		java_sdk_library_import {
-			name: "sdklib",
+			name: "sdklib-legacy",
 			jars: ["b.jar"],
 		}
 
+		java_sdk_library_import {
+			name: "sdklib",
+			public: {
+				jars: ["c.jar"],
+			},
+		}
+
 		prebuilt_stubs_sources {
 			name: "stubs-source",
 			srcs: ["stubs/sources"],
@@ -531,6 +538,54 @@ func assertDeepEquals(t *testing.T, message string, expected interface{}, actual
 	}
 }
 
+func TestJavaSdkLibraryImport(t *testing.T) {
+	ctx, _ := testJava(t, `
+		java_library {
+			name: "foo",
+			srcs: ["a.java"],
+			libs: ["sdklib"],
+			sdk_version: "current",
+		}
+
+		java_library {
+			name: "foo.system",
+			srcs: ["a.java"],
+			libs: ["sdklib"],
+			sdk_version: "system_current",
+		}
+
+		java_library {
+			name: "foo.test",
+			srcs: ["a.java"],
+			libs: ["sdklib"],
+			sdk_version: "test_current",
+		}
+
+		java_sdk_library_import {
+			name: "sdklib",
+			public: {
+				jars: ["a.jar"],
+			},
+			system: {
+				jars: ["b.jar"],
+			},
+			test: {
+				jars: ["c.jar"],
+			},
+		}
+		`)
+
+	for _, scope := range []string{"", ".system", ".test"} {
+		fooModule := ctx.ModuleForTests("foo"+scope, "android_common")
+		javac := fooModule.Rule("javac")
+
+		sdklibStubsJar := ctx.ModuleForTests("sdklib.stubs"+scope, "android_common").Rule("combineJar").Output
+		if !strings.Contains(javac.Args["classpath"], sdklibStubsJar.String()) {
+			t.Errorf("foo classpath %v does not contain %q", javac.Args["classpath"], sdklibStubsJar.String())
+		}
+	}
+}
+
 func TestDefaults(t *testing.T) {
 	ctx, _ := testJava(t, `
 		java_defaults {