2 * ===============================LICENSE_START======================================
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4 * ================================================================================
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5 * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
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6 * ================================================================================
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7 * Licensed under the Apache License, Version 2.0 (the "License");
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8 * you may not use this file except in compliance with the License.
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9 * You may obtain a copy of the License at
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11 * http://www.apache.org/licenses/LICENSE-2.0
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13 * Unless required by applicable law or agreed to in writing, software
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14 * distributed under the License is distributed on an "AS IS" BASIS,
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15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 * See the License for the specific language governing permissions and
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17 * limitations under the License.
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18 * ============================LICENSE_END===========================================
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21 package org.openecomp.dcae.apod.analytics.model.util;
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23 import com.fasterxml.jackson.core.JsonParseException;
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24 import com.fasterxml.jackson.databind.JsonMappingException;
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25 import java.io.FileNotFoundException;
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26 import java.io.IOException;
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27 import java.io.InputStream;
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28 import java.io.InputStreamReader;
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29 import java.nio.charset.Charset;
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30 import java.util.Properties;
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31 import org.slf4j.Logger;
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32 import org.slf4j.LoggerFactory;
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35 * Utility class containing methods for IO related operations
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37 * @author Rajiv Singla . Creation Date: 10/17/2016.
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39 public abstract class AnalyticsModelIOUtils extends AnalyticsModelJsonUtils {
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41 private static final Logger LOG = LoggerFactory.getLogger(AnalyticsModelIOUtils.class);
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44 * Parses given valid JSON file Location to object of given binding class type.
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46 * @param fileLocation valid JSON File Location
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47 * @param bindingClass class Type of Binding object
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49 * @param <T> binding Class Type
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51 * @return binding Class Object which properties populated from JSON File Location
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52 * @throws IOException when fails to do IO operations
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54 public static final <T> T convertToJsonObject(String fileLocation, Class<T> bindingClass) throws IOException {
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56 // Load Resource from give path
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57 final InputStream resourceAsStream = loadResourceAsStream(fileLocation);
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59 // If resource is null throw an exception
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60 if (resourceAsStream == null) {
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61 final String errorMessage = String.format("Invalid File location: %s", fileLocation);
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62 throw new IOException(errorMessage, new FileNotFoundException(errorMessage));
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65 // Parse input stream
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66 try (InputStreamReader inputStreamReader = new InputStreamReader(resourceAsStream, Charset.forName("UTF-8"))) {
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68 return ANALYTICS_MODEL_OBJECT_MAPPER.readValue(inputStreamReader, bindingClass);
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69 } catch (JsonMappingException | JsonParseException e) {
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71 // If parsing fails due to Invalid Json or Json IO Issues throw an exception
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72 final String errorMessage = String.format("Json parsing error while parsing Json File location: %s",
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75 LOG.error(errorMessage);
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76 throw new IOException(errorMessage, e);
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77 } catch (IOException e) {
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79 // If parsing fails due to IO Issues throw an exception
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80 final String errorMessage = String.format("IO Error while parsing Json File location: %s", fileLocation);
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81 LOG.error(errorMessage);
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82 throw new IOException(errorMessage, e);
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87 * Loads properties from a given file location. Throws {@link RuntimeException} if file location is invalid
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88 * or there were exception when loading properties
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90 * @param propertiesFileLocation path string for properties file
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91 * @param properties properties object that needs to be populated with give file properties
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93 * @return properties object with populated properties from properties file
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96 public static Properties loadPropertiesFile(String propertiesFileLocation, final Properties properties) {
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98 // Load Resource from give properties file path
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99 final InputStream propertiesFileInputStream = loadResourceAsStream(propertiesFileLocation);
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101 // If properties file is not present throw an exception
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102 if (propertiesFileInputStream == null) {
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103 final String errorMessage = String.format("Invalid Properties File at location: %s",
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104 propertiesFileLocation);
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105 //TODO: discuss and change this excpeiton as well.
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106 throw new RuntimeException(errorMessage, new FileNotFoundException(errorMessage));
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110 properties.load(propertiesFileInputStream);
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111 } catch (IOException e) {
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112 final String errorMessage = String.format("IO Exception while reading Properties File at location: %s",
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113 propertiesFileLocation);
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114 throw new RuntimeException(errorMessage, e);
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122 * Loads Input file from the given classpath file location and returns file InputStream
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124 * @param fileLocation classpath file location
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126 * @return {@link InputStream} for classpath file
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128 public static InputStream loadResourceAsStream(String fileLocation) {
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129 // Load Resource from give path
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130 return Thread.currentThread().getContextClassLoader().getResourceAsStream(fileLocation);
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