2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2018 Samsung Electronics Co., Ltd. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.api.main.parameters;
23 import com.google.gson.Gson;
24 import com.google.gson.GsonBuilder;
25 import org.onap.policy.common.logging.flexlogger.FlexLogger;
26 import org.onap.policy.common.logging.flexlogger.Logger;
27 import org.onap.policy.common.parameters.GroupValidationResult;
28 import org.onap.policy.api.main.PolicyApiException;
29 import org.onap.policy.api.main.startstop.ApiCommandLineArguments;
31 import java.io.FileReader;
34 * This class handles reading, parsing and validating of policy api parameters from JSON files.
36 public class ApiParameterHandler {
37 private static final Logger LOGGER = FlexLogger.getLogger(ApiParameterHandler.class);
40 * Read the parameters from the parameter file.
42 * @param arguments the arguments passed to policy api
43 * @return the parameters read from the configuration file
44 * @throws PolicyApiException on parameter exceptions
46 public ApiParameterGroup getParameters(final ApiCommandLineArguments arguments)
47 throws PolicyApiException {
48 ApiParameterGroup apiParameterGroup = null;
50 // Read the parameters
52 // Read the parameters from JSON using Gson
53 final Gson gson = new GsonBuilder().create();
54 apiParameterGroup = gson.fromJson(new FileReader(arguments.getFullConfigurationFilePath()),
55 ApiParameterGroup.class);
56 } catch (final Exception e) {
57 final String errorMessage = "error reading parameters from \"" + arguments.getConfigurationFilePath()
58 + "\"\n" + "(" + e.getClass().getSimpleName() + "):" + e.getMessage();
59 LOGGER.error(errorMessage, e);
60 throw new PolicyApiException(errorMessage, e);
63 // The JSON processing returns null if there is an empty file
64 if (apiParameterGroup == null) {
65 final String errorMessage = "no parameters found in \"" + arguments.getConfigurationFilePath() + "\"";
66 LOGGER.error(errorMessage);
67 throw new PolicyApiException(errorMessage);
70 // validate the parameters
71 final GroupValidationResult validationResult = apiParameterGroup.validate();
72 if (!validationResult.isValid()) {
73 String returnMessage =
74 "validation error(s) on parameters from \"" + arguments.getConfigurationFilePath() + "\"\n";
75 returnMessage += validationResult.getResult();
77 LOGGER.error(returnMessage);
78 throw new PolicyApiException(returnMessage);
81 return apiParameterGroup;