Default from-text stub generation in build

This change defaults Java stubs to be generated from API text files
during build. Using the `--build-from-source-stubs` flag, users can
toggle between the feature.

Test: m nothing && verify ninja path exists between android_stubs_current and android_stubs_current.from-text, and does not exist between android_stubs_current.from-source, m nothing --build-from-source-stub && verify the opposite
Bug: 274805756
Change-Id: I28834f92c1b1311e3fe0a71a6ea9e8ec2e278d7e
diff --git a/android/config.go b/android/config.go
index 8ad53e3..c6d8d9f 100644
--- a/android/config.go
+++ b/android/config.go
@@ -99,7 +99,7 @@
 
 	UseBazelProxy bool
 
-	BuildFromTextStub bool
+	BuildFromSourceStub bool
 
 	EnsureAllowlistIntegrity bool
 }
@@ -337,9 +337,9 @@
 	// unix sockets, instead of spawning Bazel as a subprocess.
 	UseBazelProxy bool
 
-	// If buildFromTextStub is true then the Java API stubs are
-	// built from the signature text files, not the source Java files.
-	buildFromTextStub bool
+	// If buildFromSourceStub is true then the Java API stubs are
+	// built from the source Java files, not the signature text files.
+	buildFromSourceStub bool
 
 	// If ensureAllowlistIntegrity is true, then the presence of any allowlisted
 	// modules that aren't mixed-built for at least one variant will cause a build
@@ -556,7 +556,7 @@
 		MultitreeBuild: cmdArgs.MultitreeBuild,
 		UseBazelProxy:  cmdArgs.UseBazelProxy,
 
-		buildFromTextStub: cmdArgs.BuildFromTextStub,
+		buildFromSourceStub: cmdArgs.BuildFromSourceStub,
 	}
 
 	config.deviceConfig = &deviceConfig{
@@ -2071,11 +2071,11 @@
 	// TODO: b/302320354 - Remove the coverage build specific logic once the
 	// robust solution for handling native properties in from-text stub build
 	// is implemented.
-	return c.buildFromTextStub && !c.JavaCoverageEnabled()
+	return !c.buildFromSourceStub && !c.JavaCoverageEnabled()
 }
 
 func (c *config) SetBuildFromTextStub(b bool) {
-	c.buildFromTextStub = b
+	c.buildFromSourceStub = !b
 	c.productVariables.Build_from_text_stub = boolPtr(b)
 }
 
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index d20847b..53f5d80 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -84,7 +84,7 @@
 	flag.BoolVar(&cmdlineArgs.BazelMode, "bazel-mode", false, "use bazel for analysis of certain modules")
 	flag.BoolVar(&cmdlineArgs.BazelModeStaging, "bazel-mode-staging", false, "use bazel for analysis of certain near-ready modules")
 	flag.BoolVar(&cmdlineArgs.UseBazelProxy, "use-bazel-proxy", false, "communicate with bazel using unix socket proxy instead of spawning subprocesses")
-	flag.BoolVar(&cmdlineArgs.BuildFromTextStub, "build-from-text-stub", false, "build Java stubs from API text files instead of source files")
+	flag.BoolVar(&cmdlineArgs.BuildFromSourceStub, "build-from-source-stub", false, "build Java stubs from source files instead of API text files")
 	flag.BoolVar(&cmdlineArgs.EnsureAllowlistIntegrity, "ensure-allowlist-integrity", false, "verify that allowlisted modules are mixed-built")
 	// Flags that probably shouldn't be flags of soong_build, but we haven't found
 	// the time to remove them yet
diff --git a/ui/build/config.go b/ui/build/config.go
index 5925b28..eae379f 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -85,7 +85,7 @@
 	searchApiDir             bool // Scan the Android.bp files generated in out/api_surfaces
 	skipMetricsUpload        bool
 	buildStartedTime         int64 // For metrics-upload-only - manually specify a build-started time
-	buildFromTextStub        bool
+	buildFromSourceStub      bool
 	ensureAllowlistIntegrity bool   // For CI builds - make sure modules are mixed-built
 	bazelExitCode            int32  // For b runs - necessary for updating NonZeroExit
 	besId                    string // For b runs, to identify the BuildEventService logs
@@ -808,8 +808,8 @@
 			} else {
 				ctx.Fatalf("unknown option for ninja_weight_source: %s", source)
 			}
-		} else if arg == "--build-from-text-stub" {
-			c.buildFromTextStub = true
+		} else if arg == "--build-from-source-stub" {
+			c.buildFromSourceStub = true
 		} else if strings.HasPrefix(arg, "--build-command=") {
 			buildCmd := strings.TrimPrefix(arg, "--build-command=")
 			// remove quotations
@@ -1157,7 +1157,7 @@
 }
 
 func (c *configImpl) BuildFromTextStub() bool {
-	return c.buildFromTextStub
+	return !c.buildFromSourceStub
 }
 
 func (c *configImpl) TargetProduct() string {
diff --git a/ui/build/soong.go b/ui/build/soong.go
index ac9bf3a..18eee75 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -188,8 +188,8 @@
 	if pb.config.multitreeBuild {
 		commonArgs = append(commonArgs, "--multitree-build")
 	}
-	if pb.config.buildFromTextStub {
-		commonArgs = append(commonArgs, "--build-from-text-stub")
+	if pb.config.buildFromSourceStub {
+		commonArgs = append(commonArgs, "--build-from-source-stub")
 	}
 
 	commonArgs = append(commonArgs, "-l", filepath.Join(pb.config.FileListDir(), "Android.bp.list"))
@@ -305,8 +305,8 @@
 	if config.MultitreeBuild() {
 		mainSoongBuildExtraArgs = append(mainSoongBuildExtraArgs, "--multitree-build")
 	}
-	if config.buildFromTextStub {
-		mainSoongBuildExtraArgs = append(mainSoongBuildExtraArgs, "--build-from-text-stub")
+	if config.buildFromSourceStub {
+		mainSoongBuildExtraArgs = append(mainSoongBuildExtraArgs, "--build-from-source-stub")
 	}
 	if config.ensureAllowlistIntegrity {
 		mainSoongBuildExtraArgs = append(mainSoongBuildExtraArgs, "--ensure-allowlist-integrity")