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"""Interop with Java."""
load("@bazel_skylib//lib:collections.bzl", "collections")
JavaInteropInfo = provider(
doc = "Information needed for interop with Java rules.",
fields = {
"inputs": "Files needed during build.",
"env": "Dict with env variables that should be set during build.",
},
)
def java_interop_info(ctx):
"""Gather information from any Java dependencies.
Args:
ctx: Rule context.
Returns:
JavaInteropInfo: Information needed for Java interop.
"""
inputs = depset(
transitive = [
# We only expose direct dependencies, though we could
# expose transitive ones as well. Only exposing the direct
# ones corresponds to Bazel's "strict Java dependencies"
# mode. See
# https://github.com/tweag/rules_haskell/issues/96.
dep[JavaInfo].compile_jars
for dep in ctx.attr.deps
if JavaInfo in dep
],
)
env_dict = dict()
uniq_classpath = collections.uniq([
f.path
for f in inputs
])
if len(uniq_classpath) > 0:
env_dict["CLASSPATH"] = ":".join(uniq_classpath)
return JavaInteropInfo(
inputs = inputs,
env = env_dict,
)
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