Implement Bazel build

This change implements both in gerrit tree and standalone Bazel build.

Change-Id: I0f339d4e4e50e863559b04cbb232a82631be79aa
diff --git a/.gitignore b/.gitignore
index defad4b..2eb7929 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,9 @@
 /.settings
 /hooks-its/.settings/org.maven.ide.eclipse.prefs
 /hooks-its/.settings/org.eclipse.m2e.core.prefs
-
+/bazel-bin
+/bazel-genfiles
+/bazel-its-base
+/bazel-out
+/bazel-reviewers
+/bazel-testlogs
diff --git a/BUILD b/BUILD
new file mode 100644
index 0000000..13cece2
--- /dev/null
+++ b/BUILD
@@ -0,0 +1,37 @@
+load("//tools/bzl:junit.bzl", "junit_tests")
+load(
+    "//tools/bzl:plugin.bzl",
+    "gerrit_plugin",
+    "PLUGIN_DEPS",
+    "PLUGIN_TEST_DEPS",
+)
+
+gerrit_plugin(
+  name = "its-base",
+  srcs = glob(["src/main/java/**/*.java"]),
+  resources = glob(["src/main/resources/**/*"]),
+)
+
+TEST_UTIL_SRC = glob(['src/test/java/com/googlesource/gerrit/plugins/its/base/testutil/**/*.java'])
+
+java_library(
+    name = 'its-base_tests-utils',
+    srcs = TEST_UTIL_SRC,
+    deps = PLUGIN_DEPS + PLUGIN_TEST_DEPS,
+    testonly = 1,
+    visibility = ['//visibility:public'],
+)
+
+junit_tests(
+    name = "its_base_tests",
+    srcs = glob(
+      ["src/test/java/**/*.java"],
+      exclude = TEST_UTIL_SRC
+    ),
+    tags = ["its-base"],
+    deps = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
+        ":its-base__plugin",
+        ":its-base_tests-utils",
+    ],
+    testonly = 1,
+)
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..0c6a6ad
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1,43 @@
+workspace(name = "its_base")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "8a4cbdc993f41fcfe7290e7d1007cfedf8d87c18",
+    # local_path = "/home/<user>/projects/bazlets",
+)
+
+# Snapshot Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+    "gerrit_api_maven_local",
+)
+
+# Release Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+#    "gerrit_api",
+#)
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_gwt.bzl",
+    "gerrit_gwt",
+)
+
+# Load release Plugin API
+#gerrit_api()
+
+# Load snapshot Plugin API
+gerrit_api_maven_local()
+
+gerrit_gwt()
+
+load(
+    "@com_googlesource_gerrit_bazlets//tools:maven_jar.bzl",
+    "maven_jar",
+)
+
+maven_jar(
+    name = "commons_dbcp",
+    artifact = "commons-dbcp:commons-dbcp:1.4",
+    sha1 = "30be73c965cc990b153a100aaaaafcf239f82d39",
+)
diff --git a/bazlets.bzl b/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index 3606c87..d6531e0 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -1,20 +1,40 @@
 Build
 =====
 
-This base library for ITS-based plugins is built with Buck.
+This base library for ITS-based plugins is built with Bazel.
 
-Clone or link this plugin to the plugins directory of Gerrit's source
-tree, and issue the command:
+Two build modes are supported: Standalone and in Gerrit tree.
+The standalone build mode is recommended, as this mode doesn't require
+the Gerrit tree to exist locally.
+
+### Build standalone
 
 ```
-  buck build plugins/its-base
+  bazel build its-base
 ```
 
 The output is created in
 
 ```
-  buck-out/gen/plugins/its-base/its-base.jar
-  buck-out/gen/plugins/its-base/lib__its-base__plugin__output/its-base__plugin.jar
+  bazel-genfiles/its-base.jar
+```
+
+To execute the tests run:
+
+```
+  bazel test :its_base_tests
+```
+
+### Build in Gerrit tree
+
+```
+  bazel build plugins/its-base
+```
+
+The output is created in
+
+```
+  bazel-genfiles/plugins/its-base/its-base.jar
 ```
 
 This project can be imported into the Eclipse IDE:
@@ -26,7 +46,7 @@
 To execute the tests run:
 
 ```
-  buck test --all --include its-base
+  bazel test plugins/its-base:its_base_tests
 ```
 
 Note that the ITS-based plugins require `its-base__plugin` library:
@@ -44,4 +64,4 @@
 
 [Back to @PLUGIN@ documentation index][index]
 
-[index]: index.html
\ No newline at end of file
+[index]: index.html
diff --git a/tools/bazel.rc b/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/tools/bzl/BUILD b/tools/bzl/BUILD
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/tools/bzl/BUILD
@@ -0,0 +1 @@
+
diff --git a/tools/bzl/junit.bzl b/tools/bzl/junit.bzl
new file mode 100644
index 0000000..3af7e58
--- /dev/null
+++ b/tools/bzl/junit.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//tools:junit.bzl",
+    "junit_tests",
+)
diff --git a/tools/bzl/plugin.bzl b/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..a2e438f
--- /dev/null
+++ b/tools/bzl/plugin.bzl
@@ -0,0 +1,6 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+    "PLUGIN_DEPS",
+    "PLUGIN_TEST_DEPS",
+)
diff --git a/tools/workspace-status.sh b/tools/workspace-status.sh
new file mode 100755
index 0000000..57797fb
--- /dev/null
+++ b/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  cd $1; git describe --always --match "v[0-9].*" --dirty
+}
+
+echo "STABLE_BUILD_ITS-BASE_LABEL" $(rev .)