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Accessing C++ Switches In Java

Introduction

Accessing C++ switches in Java is implemented via a Python script which analyzes the C++ switches file and spits out the corresponding Java class. The generated class name will be based upon the switch file name, and the path must be specified in a comment within the switch file itself.

Usage

  1. Add directives to your C++ switch file

    // GENERATED_JAVA_PACKAGE: org.chromium.chrome

// ...snip...

// Documentation for the following switch.
const char kSomeSwitch[] = "some-switch";

// ...snip...

  2. Create a template file

     // Copyright {YEAR} The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 // This file is autogenerated by
 //     {SCRIPT_NAME}
 // From
 //     {SOURCE_PATH}, and
 //     {TEMPLATE_PATH}

 package my.java.package

 // Be sure to escape any curly braces in your template by doubling as
 // follows.
 public abstract class MySwitches {{

 {NATIVE_SWITCHES}

 }}

  3. Add a new build target

    import("//build/config/android/rules.gni")

java_cpp_strings("foo_generated_switch") {
  sources = [
    "//base/android/native_foo_switches.cc",
  ]
  template = "//base/android/java_templates/MySwitches.java.tmpl"
}

  4. Add the new target to the desired android_library targets srcjar_deps:

    android_library("base_java") {
  srcjar_deps = [
    ":foo_generated_switches",
  ]
}

  5. The generated file org/chromium/chrome/NativeFooSwitches.java would contain:

    package org.chromium.chrome;

public final class NativeFooSwitches {
    // ...snip...

    public static final String SOME_SWITCH = "some-switch";

    // ...snip...
}

Code