| // Copyright (C) 2014 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.google.gerrit.server.events; |
| |
| import com.google.gson.JsonDeserializationContext; |
| import com.google.gson.JsonDeserializer; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonParseException; |
| import java.lang.reflect.Type; |
| |
| /** |
| * JSON deserializer for {@link Event}s. |
| * |
| * <p>Deserialized objects are of an appropriate subclass based on the value of the top-level "type" |
| * element. |
| */ |
| public class EventDeserializer implements JsonDeserializer<Event> { |
| @Override |
| public Event 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<?> cls = EventTypes.getClass(type); |
| if (cls == null) { |
| throw new JsonParseException("Unknown event type: " + type); |
| } |
| return context.deserialize(json, cls); |
| } |
| } |