jvpp: add support for unions (VPP-1322)

[vpp.git] / src / vpp-api / java / jvpp / gen / jvppgen / jni_type_handlers_gen.py

diff --git a/src/vpp-api/java/jvpp/gen/jvppgen/jni_type_handlers_gen.py b/src/vpp-api/java/jvpp/gen/jvppgen/jni_type_handlers_gen.py
index 31642e5..48566f6 100755 (executable)
--- a/src/vpp-api/java/jvpp/gen/jvppgen/jni_type_handlers_gen.py
+++ b/src/vpp-api/java/jvpp/gen/jvppgen/jni_type_handlers_gen.py
@@ -15,8 +15,8 @@
 #
 from string import Template
 
-from jni_common_gen import generate_j2c_swap, generate_j2c_identifiers, generate_c2j_swap
-from jvpp_model import Class, Enum
+from jni_common_gen import generate_j2c_swap, generate_j2c_field_swap, generate_j2c_identifiers, generate_c2j_swap
+from jvpp_model import Class, Enum, Union
 
 
 def generate_type_handlers(model, logger):
@@ -32,6 +32,8 @@ def generate_type_handlers(model, logger):
             _generate_class(model, t, type_handlers)
         elif isinstance(t, Enum):
             _generate_enum(model, t, type_handlers)
+        elif isinstance(t, Union):
+            _generate_union(model, t, type_handlers)
         else:
             logger.debug("Skipping custom JNI type handler generation for %s", t)
 
@@ -148,4 +150,76 @@ def _generate_scalar_net_to_host_swap(field):
     if field_type.is_swap_needed:
         return "%s((%s) _net);" % (field_type.net_to_host_function, field_type.name)
     else:
-        return "_net"
\ No newline at end of file
+        return "_net"
+
+
+def _generate_union(model, t, type_handlers):
+    type_handlers.append(_generate_union_host_to_net(model, t))
+    type_handlers.append(_generate_union_net_to_host(model, t))
+
+
+def _generate_union_host_to_net(model, t):
+    swap = []
+    for i, field in enumerate(t.fields):
+        field_type = field.type
+        swap.append(_UNION_FIELD_HOST_TO_NET_TEMPLATE.substitute(
+            field_index=i,
+            java_name=field.java_name,
+            jni_signature=field_type.jni_signature,
+            jni_type=field_type.jni_type,
+            jni_accessor=field_type.jni_accessor,
+            swap=generate_j2c_field_swap(field, struct_ref_name="_net")
+        ))
+
+    return _UNION_HOST_TO_NET_TEMPLATE.substitute(
+        c_name=t.name,
+        json_filename=model.json_api_files,
+        json_definition=t.doc,
+        class_FQN=t.jni_name,
+        swap="".join(swap)
+    )
+
+_UNION_FIELD_HOST_TO_NET_TEMPLATE = Template("""
+    if (_activeMember == ${field_index}) {
+        jfieldID fieldId = (*env)->GetFieldID(env, _class, "${java_name}", "${jni_signature}");
+        ${jni_type} ${java_name} = (*env)->Get${jni_accessor}Field(env, _host, fieldId);
+    ${swap}
+    }""")
+
+_UNION_HOST_TO_NET_TEMPLATE = Template("""
+/**
+ * Host to network byte order conversion for ${c_name} union.
+ * Generated based on $json_filename:
+$json_definition
+ */
+static inline void _host_to_net_${c_name}(JNIEnv * env, jobject _host, vl_api_${c_name}_t * _net)
+{
+    jclass _class = (*env)->FindClass(env, "${class_FQN}");
+
+    jfieldID _activeMemberFieldId = (*env)->GetFieldID(env, _class, "_activeMember", "I");
+    jint _activeMember = (*env)->GetIntField(env, _host, _activeMemberFieldId);
+$swap
+}""")
+
+
+def _generate_union_net_to_host(model, t):
+    return _UNION_NET_TO_HOST_TEMPLATE.substitute(
+        c_name=t.name,
+        json_filename=model.json_api_files,
+        json_definition=t.doc,
+        type_reference_name=t.java_name_lower,
+        class_FQN=t.jni_name,
+        swap=generate_c2j_swap(t, object_ref_name="_host", struct_ref_name="_net")
+    )
+
+_UNION_NET_TO_HOST_TEMPLATE = Template("""
+/**
+ * Network to host byte order conversion for ${c_name} union.
+ * Generated based on $json_filename:
+$json_definition
+ */
+static inline void _net_to_host_${c_name}(JNIEnv * env, vl_api_${c_name}_t * _net, jobject _host)
+{
+    jclass ${type_reference_name}Class = (*env)->FindClass(env, "${class_FQN}");
+$swap
+}""")