1 files changed, 105 insertions, 0 deletions
diff --git a/mod2/helm-generator/helmchartgenerator-core/src/main/java/org/onap/dcaegen2/platform/helmchartgenerator/Utils.java b/mod2/helm-generator/helmchartgenerator-core/src/main/java/org/onap/dcaegen2/platform/helmchartgenerator/Utils.java
new file mode 100644
index 0000000..83c67b1
--- /dev/null
+++ b/mod2/helm-generator/helmchartgenerator-core/src/main/java/org/onap/dcaegen2/platform/helmchartgenerator/Utils.java
@@ -0,0 +1,105 @@
+/*
+ * # ============LICENSE_START=======================================================
+ * # Copyright (c) 2021 AT&T Intellectual Property. 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.dcaegen2.platform.helmchartgenerator;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+
+/**
+ * An utility class for various file related tasks.
+ * @author Dhrumin Desai
+ */
+@Slf4j
+public class Utils {
+
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private Utils() {}
+
+    public static <T> T deserializeJsonFileToModel(String filePath, Class<T> modelClass) {
+        return deserializeJsonFileToModel(new File(filePath), modelClass);
+    }
+
+    /**
+     * maps json file to a model class
+     * @param file Json file which holds the data
+     * @param modelClass target model class for mapping
+     * @return mapped model instance
+     */
+    public static <T> T deserializeJsonFileToModel(File file, Class<T> modelClass) {
+        try {
+            return MAPPER.readValue(file, modelClass);
+        } catch (IOException e) {
+            log.error(e.getMessage());
+            throw new RuntimeException("Error occurred while converting file to the given model class");
+        }
+    }
+
+    /**
+     * copies dir/file to a temp location on OS
+     * @param srcLocation
+     * @return
+     */
+    public static File cloneFileToTempLocation(String srcLocation) {
+        File cloneLocation = null;
+        try {
+            Path tempRootDir = Files.createTempDirectory("chart");
+            cloneLocation = new File(tempRootDir.toString());
+            log.info("cloning dir/file at : " + tempRootDir);
+            FileUtils.copyDirectory(new File(srcLocation), cloneLocation);
+        } catch (IOException e) {
+            log.error(e.getMessage());
+            throw new RuntimeException("Error occured while cloning file to temp location.");
+        }
+        return cloneLocation;
+    }
+
+    /**
+     * deletes dir / file from temp location of OS
+     * @param dir  dir to be deleted
+     */
+    public static void deleteTempFileLocation(File dir) {
+        try {
+            FileUtils.deleteDirectory(dir);
+        } catch (IOException e) {
+            log.warn("Could not delete dir/file: " + dir.getAbsolutePath());
+        }
+    }
+
+    /**
+     * puts value into a map if only exists
+     * @param map a map
+     * @param key a key
+     * @param value a value
+     */
+    public static void putIfNotNull(Map<String, Object> map, String key, Object value){
+        if(value != null){
+            map.put(key, value);
+        }
+    }
+
+}
+