/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.wave.api.impl;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.wave.api.JsonRpcResponse;
import com.google.wave.api.JsonRpcConstant.ParamsProperty;
import com.google.wave.api.JsonRpcConstant.ResponseProperty;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
* Custom serializer and deserializer that serializes and deserializes a
* {@link JsonRpcResponse}.
*
* @author mprasetya@google.com (Marcel Prasetya)
*/
public class JsonRpcResponseGsonAdaptor implements JsonDeserializer<JsonRpcResponse>,
JsonSerializer<JsonRpcResponse>{
@Override
public JsonRpcResponse deserialize(JsonElement json, Type type,
JsonDeserializationContext context) throws JsonParseException {
JsonObject jsonObject = json.getAsJsonObject();
String id = jsonObject.get(ResponseProperty.ID.key()).getAsString();
if (jsonObject.has(ResponseProperty.ERROR.key())) {
JsonElement errorObject = jsonObject.get(ResponseProperty.ERROR.key());
String errorMessage = errorObject.getAsJsonObject().get("message").getAsString();
return JsonRpcResponse.error(id, errorMessage);
}
// Deserialize the data.
Map<ParamsProperty, Object> properties = new HashMap<ParamsProperty, Object>();
JsonElement data = jsonObject.get(ResponseProperty.DATA.key());
if (data != null && data.isJsonObject()) {
for (Entry<String, JsonElement> parameter : data.getAsJsonObject().entrySet()) {
ParamsProperty parameterType = ParamsProperty.fromKey(parameter.getKey());
if (parameterType == null) {
// Skip this unknown parameter.
continue;
}
Object object = null;
if (parameterType == ParamsProperty.BLIPS) {
object = context.deserialize(parameter.getValue(), GsonFactory.BLIP_MAP_TYPE);
} else if (parameterType == ParamsProperty.PARTICIPANTS_ADDED ||
parameterType == ParamsProperty.PARTICIPANTS_REMOVED) {
object = context.deserialize(parameter.getValue(), GsonFactory.PARTICIPANT_LIST_TYPE);
} else if (parameterType == ParamsProperty.THREADS) {
object = context.deserialize(parameter.getValue(), GsonFactory.THREAD_MAP_TYPE);
} else if (parameterType == ParamsProperty.WAVELET_IDS) {
object = context.deserialize(parameter.getValue(), GsonFactory.WAVELET_ID_LIST_TYPE);
} else if (parameterType == ParamsProperty.RAW_DELTAS) {
object = context.deserialize(parameter.getValue(), GsonFactory.RAW_DELTAS_TYPE);
} else {
object = context.deserialize(parameter.getValue(), parameterType.clazz());
}
properties.put(parameterType, object);
}
}
return JsonRpcResponse.result(id, properties);
}
@Override
public JsonElement serialize(JsonRpcResponse src, Type type, JsonSerializationContext context) {
JsonObject result = new JsonObject();
result.addProperty(ResponseProperty.ID.key(), src.getId());
if (src.isError()) {
JsonObject error = new JsonObject();
error.addProperty(ParamsProperty.MESSAGE.key(), src.getErrorMessage());
result.add(ResponseProperty.ERROR.key(), error);
} else {
JsonObject data = new JsonObject();
for (Entry<ParamsProperty, Object> properties : src.getData().entrySet()) {
data.add(properties.getKey().key(), context.serialize(properties.getValue()));
}
result.add(ResponseProperty.DATA.key(), data);
}
return result;
}
}