2 * ========================LICENSE_START=================================
3 * Copyright (C) 2020 Nordix Foundation. 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.
16 * ========================LICENSE_END===================================
19 package org.onap.ccsdk.oran.a1policymanagementservice.configuration;
21 import com.google.gson.Gson;
22 import com.google.gson.JsonElement;
23 import com.google.gson.JsonObject;
24 import com.google.gson.JsonParser;
26 import java.io.BufferedInputStream;
28 import java.io.FileInputStream;
29 import java.io.FileWriter;
30 import java.io.IOException;
31 import java.io.InputStream;
32 import java.io.InputStreamReader;
33 import java.lang.invoke.MethodHandles;
34 import java.util.Optional;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
38 import org.springframework.stereotype.Component;
41 public class ConfigurationFile {
42 private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
44 final ApplicationConfig appConfig;
45 final Gson gson = new Gson();
47 public ConfigurationFile(ApplicationConfig appConfig) {
48 this.appConfig = appConfig;
51 public long getLastModified() {
52 File file = new File(appConfig.getLocalConfigurationFilePath());
54 return file.lastModified();
59 public synchronized Optional<JsonObject> readFile() {
60 String filepath = appConfig.getLocalConfigurationFilePath();
61 File file = new File(filepath);
63 return Optional.empty();
66 try (InputStream inputStream = createInputStream(filepath)) {
67 JsonObject rootObject = getJsonElement(inputStream).getAsJsonObject();
68 logger.debug("Local configuration file read: {}", filepath);
69 return Optional.of(rootObject);
70 } catch (Exception e) {
71 logger.error("Local configuration file not read: {}, {}", filepath, e.getMessage());
72 return Optional.empty();
76 public synchronized void writeFile(JsonObject content) throws IOException {
77 String filepath = appConfig.getLocalConfigurationFilePath();
78 try (FileWriter fileWriter = getFileWriter(filepath)) {
79 gson.toJson(content, fileWriter);
80 logger.debug("Local configuration file written: {}", filepath);
84 FileWriter getFileWriter(String filepath) throws IOException {
85 return new FileWriter(filepath);
88 private JsonElement getJsonElement(InputStream inputStream) {
89 return JsonParser.parseReader(new InputStreamReader(inputStream));
92 private InputStream createInputStream(String filepath) throws IOException {
93 return new BufferedInputStream(new FileInputStream(filepath));