# Copyright 2017 The Bazel Authors. 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.

"""Bazel rules for creating Java toolchains."""

JDK8_JVM_OPTS = [
    "-Xbootclasspath/p:$(location //third_party/java/jdk/langtools:javac_jar)",
]

JDK9_JVM_OPTS = [
    # Allow JavaBuilder to access internal javac APIs.
    "--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
    "--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED",
    "--add-exports=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED",
    "--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
    "--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED",
    "--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED",
    "--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
    "--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",

    # TODO(cushon): override the javac in the JDK.
    # "--patch-module=java.compiler=$(location //third_party/java/jdk/langtools/blaze:java_compiler_jar)",
    # "--patch-module=jdk.compiler=$(location //third_party/java/jdk/langtools/blaze:jdk_compiler_jar)",
]

DEFAULT_COMPATIBLE_JAVACOPTS = {
  # Restrict protos to Java 7 so that they are compatible with Android.
  "proto": [
    "-source",
    "7",
    "-target",
    "7",
  ],
}

DEFAULT_JAVACOPTS = [
  "-XDskipDuplicateBridges=true",
  "-g",
  "-parameters",
]

DEFAULT_TOOLCHAIN_CONFIGURATION = {
  # javac -extdirs is implemented by appending the contents to the platform
  # class path after -bootclasspath. For convenience, we currently have a
  # single jar that contains the contents of both the bootclasspath and
  # extdirs.
  "bootclasspath": ["@bazel_tools//tools/jdk:platformclasspath.jar"],
  "extclasspath": [],
  "compatible_javacopts": DEFAULT_COMPATIBLE_JAVACOPTS,
  "encoding": "UTF-8",
  "forcibly_disable_header_compilation": 0,
  "genclass": ["@bazel_tools//tools/jdk:genclass"],
  "header_compiler": ["@bazel_tools//tools/jdk:turbine"],
  "ijar": ["@bazel_tools//tools/jdk:ijar"],
  "javabuilder": ["@bazel_tools//tools/jdk:javabuilder"],
  "javac": ["//third_party/java/jdk/langtools:javac_jar"],
  "javac_supports_workers": 1,
  "jvm_opts": JDK8_JVM_OPTS,
  "misc": DEFAULT_JAVACOPTS,
  "singlejar": ["@bazel_tools//tools/jdk:singlejar"],
  "source_version": "8",
  "target_version": "8",
}

def default_java_toolchain(name, **kwargs):
  """Defines a java_toolchain with appropriate defaults for Bazel."""

  toolchain_args = dict(DEFAULT_TOOLCHAIN_CONFIGURATION)
  toolchain_args.update(kwargs)

  native.java_toolchain(
      name = name,
      **toolchain_args
  )