| // Copyright (C) 2023 The Android Open Source Project |
| // |
| // 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. |
| |
| package com.ericsson.gerrit.plugins.highavailability.forwarder.jgroups; |
| |
| import com.google.gson.JsonDeserializationContext; |
| import com.google.gson.JsonDeserializer; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonParseException; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Type; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class CommandDeserializer implements JsonDeserializer<Command> { |
| |
| private static final List<Class<? extends Command>> CMD_CLASSES = |
| List.of( |
| IndexChange.Update.class, |
| IndexChange.Delete.class, |
| IndexAccount.class, |
| IndexGroup.class, |
| IndexProject.class, |
| EvictCache.class, |
| PostEvent.class, |
| AddToProjectList.class, |
| RemoveFromProjectList.class); |
| private static final Map<String, Class<?>> COMMAND_TYPE_TO_CLASS_MAPPING = new HashMap<>(); |
| |
| static { |
| for (Class<?> clazz : CMD_CLASSES) { |
| try { |
| Field type = clazz.getDeclaredField("TYPE"); |
| COMMAND_TYPE_TO_CLASS_MAPPING.put((String) type.get(null), clazz); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| @Override |
| public Command deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) |
| throws JsonParseException { |
| if (!json.isJsonObject()) { |
| throw new JsonParseException("Not an object"); |
| } |
| JsonElement typeJson = json.getAsJsonObject().get("type"); |
| if (typeJson == null |
| || !typeJson.isJsonPrimitive() |
| || !typeJson.getAsJsonPrimitive().isString()) { |
| throw new JsonParseException("Type is not a string: " + typeJson); |
| } |
| String type = typeJson.getAsJsonPrimitive().getAsString(); |
| Class<?> commandClass = COMMAND_TYPE_TO_CLASS_MAPPING.get(type); |
| if (commandClass == null) { |
| throw new JsonParseException("Unknown command type: " + type); |
| } |
| return context.deserialize(json, commandClass); |
| } |
| } |