Add support for Java with Graal AOT compilation

Author: dariost

Diff for: python/languages/java.py

@@ -0,0 +1,31 @@
+from typing import List
+import os
+
+from task_maker.args import Arch
+from task_maker.languages import CompiledLanguage, CommandType, LanguageManager
+
+
+class LanguageJava(CompiledLanguage):
+    @property
+    def name(self):
+        return "Java"
+
+    @property
+    def source_extensions(self):
+        return [".java"]
+
+    def get_compilation_command(self, source_filenames: List[str],
+                                exe_name: str, unit_name: str,
+                                for_evaluation: bool,
+                                target_arch: Arch) -> (CommandType, List[str]):
+        GRAAL_PATH = os.getenv("TM_GRAAL_PATH") or "/usr/lib/jvm/java-8-graal/bin/"
+        main_class = "grader" if "grader.java" in source_filenames else unit_name
+        commands = [
+            f"{GRAAL_PATH}javac {' '.join(source_filenames)}",
+            f"{GRAAL_PATH}native-image {main_class} {exe_name}",
+        ]
+        return CommandType.SYSTEM, ["sh", "-c", "&&".join(commands)]
+
+
+def register():
+    LanguageManager.register_language(LanguageJava())