com.sixt.service.framework.json.JsonUtil.java Source code

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Here is the source code for com.sixt.service.framework.json.JsonUtil.java

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/**
 * Copyright 2016-2017 Sixt GmbH & Co. Autovermietung KG
 * 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.sixt.service.framework.json;

import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.sixt.service.framework.rpc.RpcCallException;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletResponse;

public class JsonUtil {

    public static JsonRpcResponse parseJsonRpcResponse(String rawResponse) {
        JsonParser parser = new JsonParser();
        JsonObject response = parser.parse(rawResponse).getAsJsonObject();
        JsonElement id = response.get("id");
        JsonElement errorElement = response.get("error");
        int responseStatus = HttpServletResponse.SC_OK;
        String error;
        if (!(errorElement instanceof JsonNull)) {
            if (errorElement instanceof JsonObject) {
                error = errorElement.toString();
                // try parsing it into RpcCallException to get the HttpStatus from there
                RpcCallException rpcEx = RpcCallException.fromJson(error);
                if (rpcEx != null) {
                    responseStatus = rpcEx.getCategory().getHttpStatus();
                    JsonElement resultElement = response.get("result");
                    return new JsonRpcResponse(id, resultElement == null ? JsonNull.INSTANCE : resultElement,
                            errorElement, responseStatus);
                }
            }
            error = errorElement.getAsString();
            if (StringUtils.isNotBlank(error)) {
                responseStatus = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
            }
        }

        JsonElement resultElement = response.get("result");
        return new JsonRpcResponse(id, resultElement == null ? JsonNull.INSTANCE : resultElement, errorElement,
                responseStatus);
    }

}