From 30c9d6e771ef76c4f809b0674ee9a3edd2aa88ab Mon Sep 17 00:00:00 2001
From: Dan Albert <danalbert@google.com>
Date: Tue, 28 Mar 2017 14:54:55 -0700
Subject: Generate file to map codenames to API levels.

The NDK stub library generator needs to know what unreleased API
levels exist and what the ordering is between them. This singleton
will later be expanded to generate api-level.h to cut down on
duplication.

Test: make out/soong/api_levels.json && cat out/soong/api_levels.json
Bug: None
Change-Id: I53126dd2cacb67c331c44f7d7c77c98b176b93cd
---
 Android.bp            |  1 +
 android/api_levels.go | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 android/config.go     |  4 ++++
 android/defs.go       |  7 ++++++
 android/variable.go   |  3 ++-
 5 files changed, 77 insertions(+), 1 deletion(-)
 create mode 100644 android/api_levels.go

diff --git a/Android.bp b/Android.bp
index e3948924..c87903f0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -47,6 +47,7 @@ bootstrap_go_package {
     ],
     srcs: [
         "android/androidmk.go",
+        "android/api_levels.go",
         "android/arch.go",
         "android/config.go",
         "android/defaults.go",
diff --git a/android/api_levels.go b/android/api_levels.go
new file mode 100644
index 00000000..c77ced16
--- /dev/null
+++ b/android/api_levels.go
@@ -0,0 +1,63 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"encoding/json"
+
+	"github.com/google/blueprint"
+)
+
+func init() {
+	RegisterSingletonType("api_levels", ApiLevelsSingleton)
+}
+
+func ApiLevelsSingleton() blueprint.Singleton {
+	return &apiLevelsSingleton{}
+}
+
+type apiLevelsSingleton struct{}
+
+func createApiLevelsJson(ctx blueprint.SingletonContext, file string,
+	apiLevelsMap map[string]int) {
+
+	jsonStr, err := json.Marshal(apiLevelsMap)
+	if err != nil {
+		ctx.Errorf(err.Error())
+	}
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:    WriteFile,
+		Outputs: []string{file},
+		Args: map[string]string{
+			"content": string(jsonStr[:]),
+		},
+	})
+}
+
+func GetApiLevelsJson(ctx PathContext) Path {
+	return PathForOutput(ctx, "api_levels.json")
+}
+
+func (a *apiLevelsSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
+	baseApiLevel := 9000
+	apiLevelsMap := map[string]int{}
+	for i, codename := range ctx.Config().(Config).PlatformVersionAllCodenames() {
+		apiLevelsMap[codename] = baseApiLevel + i
+	}
+
+	apiLevelsJson := GetApiLevelsJson(ctx)
+	createApiLevelsJson(ctx, apiLevelsJson.String(), apiLevelsMap)
+}
diff --git a/android/config.go b/android/config.go
index 686eeb8e..3c254851 100644
--- a/android/config.go
+++ b/android/config.go
@@ -353,6 +353,10 @@ func (c *config) PlatformSdkVersion() string {
 	return strconv.Itoa(c.PlatformSdkVersionInt())
 }
 
+func (c *config) PlatformVersionAllCodenames() []string {
+	return c.ProductVariables.Platform_version_all_codenames
+}
+
 func (c *config) BuildNumber() string {
 	return "000000"
 }
diff --git a/android/defs.go b/android/defs.go
index d7e2a9f7..6f463162 100644
--- a/android/defs.go
+++ b/android/defs.go
@@ -80,6 +80,13 @@ var (
 			Description: "concatenate licenses $out",
 		})
 
+	WriteFile = pctx.AndroidStaticRule("WriteFile",
+		blueprint.RuleParams{
+			Command:     "echo '$content' > $out",
+			Description: "writing file $out",
+		},
+		"content")
+
 	// Used only when USE_GOMA=true is set, to restrict non-goma jobs to the local parallelism value
 	localPool = blueprint.NewBuiltinPool("local_pool")
 )
diff --git a/android/variable.go b/android/variable.go
index c5b957be..b0ab2d0c 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -82,7 +82,8 @@ type productVariables struct {
 	// Suffix to add to generated Makefiles
 	Make_suffix *string `json:",omitempty"`
 
-	Platform_sdk_version *int `json:",omitempty"`
+	Platform_sdk_version           *int     `json:",omitempty"`
+	Platform_version_all_codenames []string `json:",omitempty"`
 
 	DeviceName        *string   `json:",omitempty"`
 	DeviceArch        *string   `json:",omitempty"`
-- 
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