Add experimental option to target Java 17

Bug: 233029164
Test: EXPERIMENTAL_TARGET_JAVA_VERSION_17=true \
      EXPERIMENTAL_USE_OPENJDK17_TOOLCHAIN=true m
Change-Id: I80a9ba9eb356a460c1036e711e793c2ca6620f53

3 files changed, 23 insertions, 2 deletions

diff --git a/android/config.go b/android/config.go
index 403999dcf..eb01baaf6 100644
--- a/android/config.go
+++ b/android/config.go
@@ -698,6 +698,10 @@ func (c *config) IsEnvFalse(key string) bool {
 	return value == "0" || value == "n" || value == "no" || value == "off" || value == "false"
 }
 
+func (c *config) TargetsJava17() bool {
+	return c.IsEnvTrue("EXPERIMENTAL_TARGET_JAVA_VERSION_17")
+}
+
 // EnvDeps returns the environment variables this build depends on. The first
 // call to this function blocks future reads from the environment.
 func (c *config) EnvDeps() map[string]string {
diff --git a/java/java.go b/java/java.go
index 511e885e9..0dfb968e9 100644
--- a/java/java.go
+++ b/java/java.go
@@ -468,6 +468,12 @@ func getJavaVersion(ctx android.ModuleContext, javaVersion string, sdkContext an
 		return normalizeJavaVersion(ctx, javaVersion)
 	} else if ctx.Device() {
 		return defaultJavaLanguageVersion(ctx, sdkContext.SdkVersion(ctx))
+	} else if ctx.Config().TargetsJava17() {
+		// Temporary experimental flag to be able to try and build with
+		// java version 17 options.  The flag, if used, just sets Java
+		// 17 as the default version, leaving any components that
+		// target an older version intact.
+		return JAVA_VERSION_17
 	} else {
 		return JAVA_VERSION_11
 	}
@@ -482,6 +488,7 @@ const (
 	JAVA_VERSION_8           = 8
 	JAVA_VERSION_9           = 9
 	JAVA_VERSION_11          = 11
+	JAVA_VERSION_17          = 17
 )
 
 func (v javaVersion) String() string {
@@ -496,6 +503,8 @@ func (v javaVersion) String() string {
 		return "1.9"
 	case JAVA_VERSION_11:
 		return "11"
+	case JAVA_VERSION_17:
+		return "17"
 	default:
 		return "unsupported"
 	}
@@ -518,8 +527,10 @@ func normalizeJavaVersion(ctx android.BaseModuleContext, javaVersion string) jav
 		return JAVA_VERSION_9
 	case "11":
 		return JAVA_VERSION_11
-	case "10":
-		ctx.PropertyErrorf("java_version", "Java language levels 10 is not supported")
+	case "17":
+		return JAVA_VERSION_11
+	case "10", "12", "13", "14", "15", "16":
+		ctx.PropertyErrorf("java_version", "Java language level %s is not supported", javaVersion)
 		return JAVA_VERSION_UNSUPPORTED
 	default:
 		ctx.PropertyErrorf("java_version", "Unrecognized Java language level")
diff --git a/java/sdk.go b/java/sdk.go
index 0dddd40aa..b0da5afba 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -57,6 +57,12 @@ func defaultJavaLanguageVersion(ctx android.EarlyModuleContext, s android.SdkSpe
 		return JAVA_VERSION_8
 	} else if sdk.FinalOrFutureInt() <= 31 {
 		return JAVA_VERSION_9
+	} else if ctx.Config().TargetsJava17() {
+		// Temporary experimental flag to be able to try and build with
+		// java version 17 options.  The flag, if used, just sets Java
+		// 17 as the default version, leaving any components that
+		// target an older version intact.
+		return JAVA_VERSION_17
 	} else {
 		return JAVA_VERSION_11
 	}