Add support for android_library modules

Add support for compiling android_library modules into AARs,
and refactor app support on top of it.

Bug: 73724997
Test: app_test.go
Change-Id: I1dfac5fffe577c6680bc4709147b2061eb7d819c

java/java_resources.go

@@ -0,0 +1,113 @@
+// Copyright 2015 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 (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"android/soong/android"
+)
+
+var resourceExcludes = []string{
+	"**/*.java",
+	"**/package.html",
+	"**/overview.html",
+	"**/.*.swp",
+	"**/.DS_Store",
+	"**/*~",
+}
+
+func ResourceDirsToJarArgs(ctx android.ModuleContext,
+	resourceDirs, excludeResourceDirs []string) (args []string, deps android.Paths) {
+	var excludeDirs []string
+	var excludeFiles []string
+
+	for _, exclude := range excludeResourceDirs {
+		dirs := ctx.Glob(android.PathForModuleSrc(ctx).Join(ctx, exclude).String(), nil)
+		for _, dir := range dirs {
+			excludeDirs = append(excludeDirs, dir.String())
+			excludeFiles = append(excludeFiles, dir.(android.ModuleSrcPath).Join(ctx, "**/*").String())
+		}
+	}
+
+	excludeFiles = append(excludeFiles, resourceExcludes...)
+
+	for _, resourceDir := range resourceDirs {
+		// resourceDir may be a glob, resolve it first
+		dirs := ctx.Glob(android.PathForModuleSrc(ctx).Join(ctx, resourceDir).String(), excludeDirs)
+		for _, dir := range dirs {
+			files := ctx.GlobFiles(filepath.Join(dir.String(), "**/*"), excludeFiles)
+
+			deps = append(deps, files...)
+
+			if len(files) > 0 {
+				args = append(args, "-C", dir.String())
+
+				for _, f := range files {
+					path := f.String()
+					if !strings.HasPrefix(path, dir.String()) {
+						panic(fmt.Errorf("path %q does not start with %q", path, dir))
+					}
+					args = append(args, "-f", path)
+				}
+			}
+		}
+	}
+
+	return args, deps
+}
+
+// Convert java_resources properties to arguments to soong_zip -jar, ignoring common patterns
+// that should not be treated as resources (including *.java).
+func ResourceFilesToJarArgs(ctx android.ModuleContext,
+	res, exclude []string) (args []string, deps android.Paths) {
+
+	exclude = append([]string(nil), exclude...)
+	exclude = append(exclude, resourceExcludes...)
+	return resourceFilesToJarArgs(ctx, res, exclude)
+}
+
+// Convert java_resources properties to arguments to soong_zip -jar, keeping files that should
+// normally not used as resources like *.java
+func SourceFilesToJarArgs(ctx android.ModuleContext,
+	res, exclude []string) (args []string, deps android.Paths) {
+
+	return resourceFilesToJarArgs(ctx, res, exclude)
+}
+
+func resourceFilesToJarArgs(ctx android.ModuleContext,
+	res, exclude []string) (args []string, deps android.Paths) {
+
+	files := ctx.ExpandSources(res, exclude)
+
+	lastDir := ""
+	for i, f := range files {
+		rel := f.Rel()
+		path := f.String()
+		if !strings.HasSuffix(path, rel) {
+			panic(fmt.Errorf("path %q does not end with %q", path, rel))
+		}
+		dir := filepath.Clean(strings.TrimSuffix(path, rel))
+		if i == 0 || dir != lastDir {
+			args = append(args, "-C", dir)
+		}
+		args = append(args, "-f", path)
+		lastDir = dir
+	}
+
+	return args, files
+}