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

1 files changed, 63 insertions, 0 deletions

diff --git a/android/api_levels.go b/android/api_levels.go
new file mode 100644
index 000000000..c77ced16e
--- /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)
+}