| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| package com.epam.datalab.configuration; |
| |
| import com.google.common.base.Throwables; |
| import freemarker.template.Configuration; |
| import freemarker.template.Template; |
| import freemarker.template.TemplateException; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.File; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStreamWriter; |
| import java.nio.charset.StandardCharsets; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| /** |
| * Provides Apache FreeMarker the template engine for the billing configuration. |
| */ |
| public class FreeMarkerConfig { |
| |
| /** |
| * Create and return the input stream for the configuration file. |
| * |
| * @param filename the name of configuration file. |
| * @throws IOException |
| */ |
| public InputStream getInputStream(final String filename) throws IOException { |
| try { |
| Configuration conf = new Configuration(Configuration.VERSION_2_3_22); |
| Template template = new Template("billing-config", new FileReader(new File(filename)), conf); |
| Map<String, Object> dataModel = getDataModel(); |
| |
| ByteArrayOutputStream streamBuffer = new ByteArrayOutputStream(); |
| template.process(dataModel, new OutputStreamWriter(streamBuffer, StandardCharsets.UTF_8)); |
| byte[] buffer = streamBuffer.toByteArray(); |
| |
| return new ByteArrayInputStream(buffer); |
| } catch (TemplateException e) { |
| throw Throwables.propagate(e); |
| } |
| } |
| |
| /** |
| * Create and return JVM and OS properties. |
| */ |
| private Map<String, Object> getDataModel() { |
| Map<String, Object> dataModel = new HashMap<>(); |
| |
| Iterator<Object> sysProps = System.getProperties().keySet().iterator(); |
| while (sysProps.hasNext()) { |
| String key = (String) sysProps.next(); |
| dataModel.put(key, System.getProperties().getProperty(key)); |
| } |
| dataModel.putAll(System.getenv()); |
| |
| dataModel.put("env", System.getenv()); |
| dataModel.put("sys", System.getProperties()); |
| |
| return dataModel; |
| } |
| } |