jvpp: add support for enums (VPP-1153)

Change-Id: I2a1b946a71419e1fb3c5d70567c54a6a7d841f10
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/vpp-api/java/jvpp/gen/jvppgen/enums_gen.py b/src/vpp-api/java/jvpp/gen/jvppgen/enums_gen.py
new file mode 100755
index 00000000000..8ba96558428
--- /dev/null
+++ b/src/vpp-api/java/jvpp/gen/jvppgen/enums_gen.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python2
+#
+# Copyright (c) 2016,2018 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from string import Template
+
+from jvpp_model import Enum
+
+
+def generate_enums(work_dir, model, logger):
+    logger.debug("Generating enums for %s " % model.json_api_files)
+
+    for t in model.types:
+        if not isinstance(t, Enum):
+            continue
+        logger.debug("Generating DTO for enum %s", t)
+        type_class_name = t.java_name
+        type_class = _ENUM_TEMPLATE.substitute(
+            plugin_package=model.plugin_package,
+            c_type_name=t.name,
+            json_filename=model.json_api_files,
+            json_definition=t.doc,
+            java_enum_name=type_class_name,
+            constants=_generate_constants(t.constants),
+            value_type=t.value.type.java_name
+        )
+        with open("%s/%s.java" % (work_dir, type_class_name), "w") as f:
+            f.write(type_class)
+
+_ENUM_TEMPLATE = Template("""
+package $plugin_package.types;
+
+/**
+ * <p>This class represents $c_type_name enum definition.
+ * <br>It was generated by enums_gen.py based on $json_filename:
+ * <pre>
+$json_definition
+ * </pre>
+ */
+public enum $java_enum_name {
+$constants;
+
+    public final $value_type value;
+
+    $java_enum_name(final $value_type value) {
+        this.value = value;
+    }
+    
+    public static $java_enum_name forValue(final $value_type value) {
+        for ($java_enum_name enumeration : $java_enum_name.values()) {
+            if (value == enumeration.value) {
+                return enumeration;
+            }
+        }
+        return null;
+    }
+}
+""")
+
+
+def _generate_constants(constants):
+    return ",\n".join(_CONSTANT_TEMPLATE.substitute(name=c['name'], value=c['value']) for c in constants)
+
+_CONSTANT_TEMPLATE = Template("""    $name($value)""")