Correct Rust -> Java method call semantics to avoid double-conversion

[ldk-java] / java_strings.py

diff --git a/java_strings.py b/java_strings.py
index d4931cd912038295c89ab63ce11f0ffdbe9e35e7..2ddecab7539aed909fc8f544515f4ec3497e1a0a 100644 (file)
--- a/java_strings.py
+++ b/java_strings.py
@@ -96,6 +96,7 @@ public class bindings {
         self.util_fn_pfx = """package org.ldk.structs;
 import org.ldk.impl.bindings;
 import java.util.Arrays;
+import javax.annotation.Nullable;
 import org.ldk.enums.*;
 
 public class UtilMethods {
@@ -473,6 +474,7 @@ import org.ldk.impl.bindings;
 import org.ldk.enums.*;
 import org.ldk.util.*;
 import java.util.Arrays;
+import javax.annotation.Nullable;
 
 """
         self.c_fn_ty_pfx = "JNIEXPORT "
@@ -482,6 +484,7 @@ import java.util.Arrays;
         self.ptr_native_ty = "long"
         self.result_c_ty = "jclass"
         self.ptr_arr = "jobjectArray"
+        self.is_arr_some_check = ("", " != NULL")
         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 
     def construct_jenv(self):
@@ -846,7 +849,7 @@ import java.util.Arrays;
                 elif not fn_line.ret_ty_info.passed_as_ptr:
                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
                 else:
-                    out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret = (" + fn_line.ret_ty_info.rust_obj + "*)(*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
+                    out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 
                 for idx, arg_info in enumerate(fn_line.args_ty):
                     if arg_info.ret_conv is not None:
@@ -1021,7 +1024,7 @@ import java.util.Arrays;
             init_meth_params = ""
             init_meth_body = ""
             hu_conv_body = ""
-            for idx, field_ty in enumerate(var.fields):
+            for idx, (field_ty, field_docs) in enumerate(var.fields):
                 if idx > 0:
                     init_meth_params = init_meth_params + ", "
 
@@ -1032,7 +1035,12 @@ import java.util.Arrays;
                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
                 else:
                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
-                    java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
+                    if field_docs is not None:
+                        java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
+                    java_hu_subclasses += "\t\t"
+                    if field_ty.nullable:
+                        java_hu_subclasses += "@Nullable "
+                    java_hu_subclasses += "public final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
                 if field_ty.to_hu_conv is not None:
@@ -1066,7 +1074,7 @@ import java.util.Arrays;
         for var in variant_list:
             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
             c_params = []
-            for idx, field_map in enumerate(var.fields):
+            for idx, (field_map, field_docs) in enumerate(var.fields):
                 if field_map.ret_conv is not None:
                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
                     if var.tuple_variant:
@@ -1137,6 +1145,8 @@ import java.util.Arrays;
             meth_n = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
             if doc_comment is not None:
                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
+            if return_type_info.nullable:
+                out_java_struct += "\t@Nullable\n"
             if not takes_self:
                 if meth_n == "new":
                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
@@ -1154,13 +1164,19 @@ import java.util.Arrays;
                     continue
                 if arg.java_ty != "void":
                     if arg.arg_name in default_constructor_args:
+                        assert not arg.nullable
                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
                             if explode_idx != 0:
                                 out_java_struct += (", ")
                             out_java_struct += (
                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
                     else:
-                        out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
+                        if arg.nullable:
+                            out_java_struct += "@Nullable "
+                        ty_string = arg.java_hu_ty
+                        if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
+                            ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
+                        out_java_struct += ty_string + " " + arg.arg_name
         out_java += (");\n")
         out_c += (") {\n")
         if out_java_struct is not None: