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