2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2019 Nordix Foundation.
4 * Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.models.sim.dmaap.startstop;
25 import java.io.PrintWriter;
26 import java.io.StringWriter;
28 import java.util.Arrays;
31 import org.apache.commons.cli.CommandLine;
32 import org.apache.commons.cli.DefaultParser;
33 import org.apache.commons.cli.HelpFormatter;
34 import org.apache.commons.cli.Option;
35 import org.apache.commons.cli.Options;
36 import org.apache.commons.cli.ParseException;
37 import org.apache.commons.lang3.StringUtils;
38 import org.onap.policy.common.utils.resources.ResourceUtils;
39 import org.onap.policy.models.sim.dmaap.DmaapSimException;
40 import org.onap.policy.models.sim.dmaap.DmaapSimRuntimeException;
44 * This class reads and handles command line parameters for the DMaaP simulator service.
46 public class DmaapSimCommandLineArguments {
47 private static final String FILE_MESSAGE_PREAMBLE = " file \"";
48 private static final int HELP_LINE_LENGTH = 120;
50 private final Options options;
54 private String configurationFilePath = null;
57 * Construct the options for the CLI editor.
59 public DmaapSimCommandLineArguments() {
61 options = new Options();
62 options.addOption(Option.builder("h")
64 .desc("outputs the usage of this command")
68 options.addOption(Option.builder("v")
70 .desc("outputs the version of DMaaP simulator")
74 options.addOption(Option.builder("c")
75 .longOpt("config-file")
76 .desc("the full path to the configuration file to use, "
77 + "the configuration file must be a Json file containing the DMaaP simulator parameters")
79 .argName("CONFIG_FILE")
87 * Construct the options for the CLI editor and parse in the given arguments.
89 * @param args The command line arguments
91 public DmaapSimCommandLineArguments(final String[] args) {
92 // Set up the options with the default constructor
95 // Parse the arguments
98 } catch (final DmaapSimException e) {
99 throw new DmaapSimRuntimeException("parse error on DMaaP simulator parameters", e);
104 * Parse the command line options.
106 * @param args The command line arguments
107 * @return a string with a message for help and version, or null if there is no message
108 * @throws DmaapSimException on command argument errors
110 public String parse(final String[] args) throws DmaapSimException {
111 // Clear all our arguments
112 setConfigurationFilePath(null);
114 CommandLine commandLine = null;
116 commandLine = new DefaultParser().parse(options, args);
117 } catch (final ParseException e) {
118 throw new DmaapSimException("invalid command line arguments specified : " + e.getMessage());
121 // Arguments left over after Commons CLI does its stuff
122 final String[] remainingArgs = commandLine.getArgs();
124 if (remainingArgs.length > 0 && commandLine.hasOption('c') || remainingArgs.length > 0) {
125 throw new DmaapSimException("too many command line arguments specified : " + Arrays.toString(args));
128 if (remainingArgs.length == 1) {
129 configurationFilePath = remainingArgs[0];
132 if (commandLine.hasOption('h')) {
133 return help(Main.class.getName());
136 if (commandLine.hasOption('v')) {
140 if (commandLine.hasOption('c')) {
141 setConfigurationFilePath(commandLine.getOptionValue('c'));
148 * Validate the command line options.
150 * @throws DmaapSimException on command argument validation errors
152 public void validate() throws DmaapSimException {
153 validateFileExists("DMaaP simulator configuration", configurationFilePath);
157 * Print version information for DMaaP simulator.
159 * @return the version string
161 public String version() {
162 return ResourceUtils.getResourceAsString("version.txt");
166 * Print help information for DMaaP simulator.
168 * @param mainClassName the main class name
169 * @return the help string
171 public String help(final String mainClassName) {
172 final HelpFormatter helpFormatter = new HelpFormatter();
173 final StringWriter stringWriter = new StringWriter();
174 final PrintWriter printWriter = new PrintWriter(stringWriter);
176 helpFormatter.printHelp(printWriter, HELP_LINE_LENGTH, mainClassName + " [options...]", "options", options, 0,
179 return stringWriter.toString();
183 * Gets the full expanded configuration file path.
185 * @return the configuration file path
187 public String getFullConfigurationFilePath() {
188 return ResourceUtils.getFilePath4Resource(getConfigurationFilePath());
192 * Check set configuration file path.
194 * @return true, if check set configuration file path
196 public boolean checkSetConfigurationFilePath() {
197 return configurationFilePath != null && configurationFilePath.length() > 0;
201 * Validate file exists.
203 * @param fileTag the file tag
204 * @param fileName the file name
205 * @throws DmaapSimException on the file name passed as a parameter
207 private void validateFileExists(final String fileTag, final String fileName) throws DmaapSimException {
208 if (StringUtils.isBlank(fileName)) {
209 throw new DmaapSimException(fileTag + " file was not specified as an argument");
212 // The file name refers to a resource on the local file system
213 final URL fileUrl = ResourceUtils.getUrl4Resource(fileName);
214 if (fileUrl == null) {
215 throw new DmaapSimException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" does not exist");
218 final File theFile = new File(fileUrl.getPath());
219 if (!theFile.exists()) {
220 throw new DmaapSimException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" does not exist");