io.openvidu.client.internal.JsonRoomUtils.java Source code

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Here is the source code for io.openvidu.client.internal.JsonRoomUtils.java

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/*
 * (C) Copyright 2017-2019 OpenVidu (https://openvidu.io/)
 *
 * 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 io.openvidu.client.internal;

import org.kurento.jsonrpc.message.Request;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import io.openvidu.client.OpenViduException;
import io.openvidu.client.OpenViduException.Code;

/**
 * JSON tools for extracting info from request or response elements.
 *
 * @author <a href="mailto:rvlad@naevatec.com">Radu Tom Vlad</a>
 */
public class JsonRoomUtils {

    public static <T> T getRequestParam(Request<JsonObject> request, String paramName, Class<T> type) {
        return getRequestParam(request, paramName, type, false);
    }

    public static <T> T getRequestParam(Request<JsonObject> request, String paramName, Class<T> type,
            boolean allowNull) {
        JsonObject params = request.getParams();
        if (params == null) {
            if (!allowNull) {
                throw new OpenViduException(Code.TRANSPORT_REQUEST_ERROR_CODE,
                        "Invalid request lacking parameter '" + paramName + "'");
            } else {
                return null;
            }
        }
        return getConverted(params.get(paramName), paramName, type, allowNull);
    }

    public static <T> T getResponseProperty(JsonElement result, String property, Class<T> type) {
        return getResponseProperty(result, property, type, false);
    }

    public static <T> T getResponseProperty(JsonElement result, String property, Class<T> type, boolean allowNull) {
        if (!(result instanceof JsonObject)) {
            throw new OpenViduException(Code.TRANSPORT_RESPONSE_ERROR_CODE,
                    "Invalid response format. The response '" + result + "' should be a Json object");
        }
        return getConverted(result.getAsJsonObject().get(property), property, type, allowNull);
    }

    public static JsonArray getResponseArray(JsonElement result) {
        if (!result.isJsonArray()) {
            throw new OpenViduException(Code.TRANSPORT_RESPONSE_ERROR_CODE,
                    "Invalid response format. The response '" + result + "' should be a Json array");
        }
        return result.getAsJsonArray();
    }

    @SuppressWarnings("unchecked")
    private static <T> T getConverted(JsonElement paramValue, String property, Class<T> type, boolean allowNull) {
        if (paramValue == null) {
            if (allowNull) {
                return null;
            } else {
                throw new OpenViduException(Code.TRANSPORT_ERROR_CODE,
                        "Invalid method lacking parameter '" + property + "'");
            }
        }

        if (type == String.class) {
            if (paramValue.isJsonPrimitive()) {
                return (T) paramValue.getAsString();
            }
        }

        if (type == Integer.class) {
            if (paramValue.isJsonPrimitive()) {
                return (T) Integer.valueOf(paramValue.getAsInt());
            }
        }

        if (type == JsonArray.class) {
            if (paramValue.isJsonArray()) {
                return (T) paramValue.getAsJsonArray();
            }
        }

        throw new OpenViduException(Code.TRANSPORT_ERROR_CODE,
                "Param '" + property + "' with value '" + paramValue + "' is not a " + type.getName());
    }
}