Added setup files to support using from Bazel

Includes simple warning suppression annotations, with an issue filed for
followup.

A MODULE.bazel is included, but incomplete, as j2cl and elemental2 do
not use this format yet.

.bazelrc

@@ -0,0 +1,5 @@
+# Enable Java 11
+build --java_language_version=11
+
+# Enable Java 11 for J2CL compiler itself
+build --tool_java_language_version=11

.bazelversion

@@ -0,0 +1 @@
+5.4.1

BUILD

@@ -0,0 +1,10 @@
+load("@com_google_j2cl//build_defs:rules.bzl", "j2cl_library")
+
+j2cl_library(
+    name = 'gwt-nio',
+    srcs = glob(["src/main/java/**/*.java"]),
+    deps = [
+        "@com_google_j2cl//:jsinterop-annotations-j2cl",
+        "@com_google_elemental2//:elemental2-core-j2cl",
+    ],
+)

MODULE.bazel

@@ -0,0 +1,4 @@
+module(
+    name = "gwt-nio",
+    repo_name = "com_vertispan_nio",
+)

WORKSPACE

@@ -0,0 +1,30 @@
+workspace(name = "com_vertispan_nio")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# Load j2cl repository
+http_archive(
+    name = "com_google_j2cl",
+    strip_prefix = "j2cl-20230718",
+    url = "https://github.com/google/j2cl/archive/refs/tags/v20230718.zip",
+)
+
+load("@com_google_j2cl//build_defs:repository.bzl", "load_j2cl_repo_deps")
+load_j2cl_repo_deps()
+
+load("@com_google_j2cl//build_defs:workspace.bzl", "setup_j2cl_workspace")
+setup_j2cl_workspace()
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "com_google_elemental2",
+    strip_prefix = "elemental2-1.2.1",
+    url = "https://github.com/google/elemental2/archive/1.2.1.zip",
+)
+
+load("@com_google_elemental2//build_defs:repository.bzl", "load_elemental2_repo_deps")
+load_elemental2_repo_deps()
+
+load("@com_google_elemental2//build_defs:workspace.bzl", "setup_elemental2_workspace")
+setup_elemental2_workspace()

src/main/java/java/nio/DoubleBuffer.java

@@ -79,6 +79,7 @@ public abstract class DoubleBuffer extends Buffer implements Comparable<DoubleBu
      *         other}; a positive value if this is greater than {@code other}.
      * @exception ClassCastException if {@code other} is not a double buffer.
      */
+    @SuppressWarnings("IdentityBinaryExpression")
     public int compareTo (DoubleBuffer otherBuffer) {
         int compareRemaining = (remaining() < otherBuffer.remaining()) ?
                 remaining() : otherBuffer.remaining();
@@ -122,6 +123,8 @@ public int compareTo (DoubleBuffer otherBuffer) {
      * @param other the object to compare with this double buffer.
      * @return {@code true} if this double buffer is equal to {@code other}, {@code false} otherwise.
      */
+    @SuppressWarnings({"EqualsHashCode", "IdentityBinaryExpression"})
+
     public boolean equals (Object other) {
         if (!(other instanceof DoubleBuffer)) {
             return false;

src/main/java/java/nio/FloatBuffer.java

@@ -89,6 +89,7 @@ public FloatBuffer compact () {
      *         {@code otherBuffer}; a positive value if this is greater than {@code otherBuffer}.
      * @exception ClassCastException if {@code otherBuffer} is not a float buffer.
      */
+    @SuppressWarnings("IdentityBinaryExpression")
     public int compareTo (FloatBuffer otherBuffer) {
         int compareRemaining = (remaining() < otherBuffer.remaining()) ?
                 remaining() : otherBuffer.remaining();
@@ -137,6 +138,7 @@ public FloatBuffer duplicate () {
      * @param other the object to compare with this float buffer.
      * @return {@code true} if this float buffer is equal to {@code other}, {@code false} otherwise.
      */
+    @SuppressWarnings({"EqualsHashCode", "IdentityBinaryExpression"})
     public boolean equals (Object other) {
         if (!(other instanceof FloatBuffer)) {
             return false;