Adding ability to generate bundle-specific Java API docs.

Can be run from top-level as "bazel build $(bazel query 'kind("javadoc", //...)')"

Change-Id: Ic24c03def3cf1d707c8ff86a6f9868a3d6d57601
diff --git a/tools/build/bazel/javadoc.bzl b/tools/build/bazel/javadoc.bzl
new file mode 100644
index 0000000..3c01502
--- /dev/null
+++ b/tools/build/bazel/javadoc.bzl
@@ -0,0 +1,48 @@
+# Copyright 2015 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.
+
+def _impl(ctx):
+  dir = ctx.label.name
+  jar = ctx.outputs.jar
+
+  dep_list = []
+  for dep in ctx.files.deps:
+    dep_list += [dep.path]
+
+  src_list = []
+  for src in ctx.files.srcs:
+    src_list += [src.path]
+
+  cmd = [
+      "mkdir %s" % dir,
+      "javadoc -quiet -tag onos.rsModel:a:\"onos model\" -d %s -cp %s %s" \
+          % (dir, ":".join(dep_list), " ".join(src_list)),
+      "jar cf %s -C %s ." % (jar.path, dir),
+  ]
+
+  ctx.action(
+      inputs = ctx.files.srcs + ctx.files.deps,
+      outputs = [jar],
+      command = ";\n".join(cmd)
+  )
+
+javadoc = rule(
+    attrs = {
+        "deps": attr.label_list(allow_files = True),
+        "srcs": attr.label_list(allow_files = True),
+    },
+    implementation = _impl,
+    outputs = {"jar" : "%{name}.jar"},
+)
+