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/*-
* ========================LICENSE_START=================================
* Copyright (C) 2020 Nordix Foundation. All rights reserved.
* ======================================================================
* 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.
* ========================LICENSE_END===================================
*/
package org.onap.ccsdk.oran.a1policymanagementservice.configuration;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.invoke.MethodHandles;
import java.util.Optional;
import javax.validation.constraints.NotNull;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class ConfigurationFile {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
final ApplicationConfig appConfig;
final Gson gson = new Gson();
@Autowired
public ConfigurationFile(ApplicationConfig appConfig) {
this.appConfig = appConfig;
}
public long getLastModified() {
File file = new File(appConfig.getLocalConfigurationFilePath());
if (file.exists()) {
return file.lastModified();
}
return 0;
}
public synchronized Optional<JsonObject> readFile() {
String filepath = appConfig.getLocalConfigurationFilePath();
File file = new File(filepath);
if (!file.exists()) {
return Optional.empty();
}
try (InputStream inputStream = createInputStream(filepath)) {
JsonObject rootObject = getJsonElement(inputStream).getAsJsonObject();
logger.debug("Local configuration file read: {}", filepath);
return Optional.of(rootObject);
} catch (Exception e) {
logger.error("Local configuration file not read: {}, {}", filepath, e.getMessage());
return Optional.empty();
}
}
public synchronized void writeFile(JsonObject content) throws IOException {
String filepath = appConfig.getLocalConfigurationFilePath();
try (FileWriter fileWriter = getFileWriter(filepath)) {
gson.toJson(content, fileWriter);
logger.debug("Local configuration file written: {}", filepath);
}
}
FileWriter getFileWriter(String filepath) throws IOException {
return new FileWriter(filepath);
}
private JsonElement getJsonElement(InputStream inputStream) {
return JsonParser.parseReader(new InputStreamReader(inputStream));
}
private InputStream createInputStream(@NotNull String filepath) throws IOException {
return new BufferedInputStream(new FileInputStream(filepath));
}
}
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