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// Copyright 2018 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 java
import (
"android/soong/android"
"sort"
"strconv"
"strings"
"github.com/google/blueprint/proptools"
)
// prebuilt_apis is a meta-module that generates filegroup modules for all
// API txt files found under the directory where the Android.bp is located.
// Specificaly, an API file located at ./<ver>/<scope>/api/<module>.txt
// generates a filegroup module named <module>-api.<scope>.<ver>.
//
// It also creates <module>-api.<scope>.latest for the lastest <ver>.
//
func init() {
android.RegisterModuleType("prebuilt_apis", prebuiltApisFactory)
android.PreArchMutators(func(ctx android.RegisterMutatorsContext) {
ctx.TopDown("prebuilt_apis", prebuiltApisMutator).Parallel()
})
}
type prebuiltApis struct {
android.ModuleBase
}
func (module *prebuiltApis) DepsMutator(ctx android.BottomUpMutatorContext) {
// no need to implement
}
func (module *prebuiltApis) GenerateAndroidBuildActions(ctx android.ModuleContext) {
// no need to implement
}
func parseApiFilePath(ctx android.BaseModuleContext, path string) (module string, apiver int, scope string) {
elements := strings.Split(path, "/")
ver, err := strconv.Atoi(elements[0])
if err != nil {
ctx.ModuleErrorf("invalid version %q found in path: %q", elements[0], path)
return
}
apiver = ver
scope = elements[1]
if scope != "public" && scope != "system" && scope != "test" {
ctx.ModuleErrorf("invalid scope %q found in path: %q", scope, path)
return
}
// elements[2] is string literal "api". skipping.
module = strings.TrimSuffix(elements[3], ".txt")
return
}
func createFilegroup(mctx android.TopDownMutatorContext, module string, scope string, apiver string, path string) {
fgName := module + ".api." + scope + "." + apiver
filegroupProps := struct {
Name *string
Srcs []string
}{}
filegroupProps.Name = proptools.StringPtr(fgName)
filegroupProps.Srcs = []string{path}
mctx.CreateModule(android.ModuleFactoryAdaptor(android.FileGroupFactory), &filegroupProps)
}
func prebuiltApisMutator(mctx android.TopDownMutatorContext) {
if _, ok := mctx.Module().(*prebuiltApis); ok {
mydir := mctx.ModuleDir() + "/"
// <apiver>/<scope>/api/<module>.txt
files, err := mctx.GlobWithDeps(mydir+"*/*/api/*.txt", nil)
if err != nil {
mctx.ModuleErrorf("failed to glob api txt files under %q: %s", mydir, err)
}
if len(files) == 0 {
mctx.ModuleErrorf("no api file found under %q", mydir)
}
// construct a map to find out the latest api file path
// for each (<module>, <scope>) pair.
type latestApiInfo struct {
module string
scope string
apiver int
path string
}
m := make(map[string]latestApiInfo)
for _, f := range files {
// create a filegroup for each api txt file
localPath := strings.TrimPrefix(f, mydir)
module, apiver, scope := parseApiFilePath(mctx, localPath)
createFilegroup(mctx, module, scope, strconv.Itoa(apiver), localPath)
// find the latest apiver
key := module + "." + scope
info, ok := m[key]
if !ok {
m[key] = latestApiInfo{module, scope, apiver, localPath}
} else if apiver > info.apiver {
info.apiver = apiver
info.path = localPath
}
}
// create filegroups for the latest version of (<module>, <scope>) pairs
// sort the keys in order to make build.ninja stable
keys := make([]string, 0, len(m))
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
info := m[k]
createFilegroup(mctx, info.module, info.scope, "latest", info.path)
}
}
}
func prebuiltApisFactory() android.Module {
module := &prebuiltApis{}
android.InitAndroidModule(module)
return module
}
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