Java bindings (#147)

bindings/java/tools/build.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+#
+# This script adapted from: 
+# https://github.com/apache/opendal/blob/93e5f65bbf30df2fed4bdd95bb0685c73c6418c2/bindings/java/tools/build.py
+
+from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser
+from pathlib import Path
+import shutil
+import subprocess
+
+def classifier_to_target(classifier: str) -> str:
+    if classifier == 'osx-aarch_64':
+        return 'aarch64-apple-darwin'
+    if classifier == 'osx-x86_64':
+        return 'x86_64-apple-darwin'
+    if classifier == 'linux-aarch_64':
+        return 'aarch64-unknown-linux-gnu'
+    if classifier == 'linux-x86_64':
+        return 'x86_64-unknown-linux-gnu'
+    if classifier == 'windows-x86_64':
+        return 'x86_64-pc-windows-msvc'
+    raise Exception(f'Unsupported classifier: {classifier}')
+
+def get_cargo_artifact_name(classifier: str) -> str:
+    if classifier.startswith('osx'):
+        return 'libregorus_java.dylib'
+    if classifier.startswith('linux'):
+        return 'libregorus_java.so'
+    if classifier.startswith('windows'):
+        return 'regorus_java.dll'
+    raise Exception(f'Unsupported classifier: {classifier}')
+
+
+if __name__ == '__main__':
+    basedir = Path(__file__).parent.parent
+
+    parser = ArgumentParser()
+    parser.add_argument('--classifier', type=str, required=True)
+    args = parser.parse_args()
+
+    target = classifier_to_target(args.classifier)    
+
+    # Setup target.
+    command = ['rustup', 'target', 'add', target]
+    print('$ ' + subprocess.list2cmdline(command))
+    subprocess.run(command, cwd=basedir, check=True)
+
+    cmd = ['cargo', 'build', '--target', target]
+
+    output = basedir / 'target' / 'bindings'
+    Path(output).mkdir(exist_ok=True, parents=True)
+    cmd += ['--target-dir', str(output)]
+
+    print('$ ' + subprocess.list2cmdline(cmd))
+    subprocess.run(cmd, cwd=basedir, check=True)
+
+    # History reason of cargo profiles.
+    profile = 'debug'
+    artifact = get_cargo_artifact_name(args.classifier)
+    src = output / target / profile / artifact
+    dst = basedir / 'target' / 'classes' / 'native' / args.classifier / artifact
+    dst.parent.mkdir(exist_ok=True, parents=True)
+    shutil.copy2(src, dst)