1 files changed, 93 insertions, 0 deletions
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/configuration/ConfigurationFile.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/configuration/ConfigurationFile.java
new file mode 100644
index 00000000..345722cb
--- /dev/null
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/configuration/ConfigurationFile.java
@@ -0,0 +1,93 @@
+/*-
+ * ========================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.util.Optional;
+import javax.validation.constraints.NotNull;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+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(ConfigurationFile.class);
+
+    final ApplicationConfig appConfig;
+    final Gson gson = new Gson();
+
+    @Autowired
+    public ConfigurationFile(ApplicationConfig appConfig) {
+        this.appConfig = appConfig;
+    }
+
+    public synchronized Optional<JsonObject> readFile() {
+        String filepath = appConfig.getLocalConfigurationFilePath();
+        if (!fileExists(filepath)) {
+            return Optional.empty();
+        }
+
+        try (InputStream inputStream = createInputStream(filepath)) {
+            JsonObject rootObject = getJsonElement(inputStream).getAsJsonObject();
+            logger.debug("Local configuration file loaded: {}", filepath);
+            return Optional.of(rootObject);
+        } catch (Exception e) {
+            logger.error("Local configuration file not loaded: {}, {}", filepath, e.getMessage());
+            return Optional.empty();
+        }
+    }
+
+    public synchronized void writeFile(JsonObject content) throws ServiceException {
+        String filepath = appConfig.getLocalConfigurationFilePath();
+        try (FileWriter fileWriter = getFileWriter(filepath)) {
+            gson.toJson(content, fileWriter);
+        } catch (IOException e) {
+            logger.error("Local configuration file not written: {}, {}", filepath, e.getMessage());
+            throw new ServiceException("Local configuration file not written");
+        }
+    }
+
+    FileWriter getFileWriter(String filepath) throws IOException {
+        return new FileWriter(filepath);
+    }
+
+    private boolean fileExists(String filepath) {
+        return (new File(filepath).exists());
+    }
+
+    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));
+    }
+}