2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2018 Samsung Electronics Co., Ltd. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.api.main.startstop;
24 import java.io.PrintWriter;
25 import java.io.StringWriter;
27 import java.util.Arrays;
28 import org.apache.commons.cli.CommandLine;
29 import org.apache.commons.cli.DefaultParser;
30 import org.apache.commons.cli.HelpFormatter;
31 import org.apache.commons.cli.Option;
32 import org.apache.commons.cli.Options;
33 import org.apache.commons.cli.ParseException;
34 import org.onap.policy.api.main.exception.PolicyApiException;
35 import org.onap.policy.api.main.exception.PolicyApiRuntimeException;
36 import org.onap.policy.common.utils.resources.ResourceUtils;
39 * This class reads and handles command line parameters for the policy api main program.
41 public class ApiCommandLineArguments {
42 private static final String FILE_MESSAGE_PREAMBLE = " file \"";
43 private static final int HELP_LINE_LENGTH = 120;
45 // Apache Commons CLI options
46 private final Options options;
48 // The command line options
49 private String configurationFilePath = null;
52 * Construct the options for the CLI editor.
54 public ApiCommandLineArguments() {
56 options = new Options();
57 options.addOption(Option.builder("h")
59 .desc("outputs the usage of this command")
63 options.addOption(Option.builder("v")
65 .desc("outputs the version of policy api")
69 options.addOption(Option.builder("c")
70 .longOpt("config-file")
71 .desc("the full path to the configuration file to use, "
72 + "the configuration file must be a Json file containing the policy api parameters")
74 .argName("CONFIG_FILE")
82 * Construct the options for the CLI editor and parse in the given arguments.
84 * @param args The command line arguments
86 public ApiCommandLineArguments(final String[] args) {
87 // Set up the options with the default constructor
90 // Parse the arguments
93 } catch (final PolicyApiException e) {
94 throw new PolicyApiRuntimeException("parse error on policy api parameters", e);
99 * Parse the command line options.
101 * @param args The command line arguments
102 * @return a string with a message for help and version, or null if there is no message
103 * @throws PolicyApiException on command argument errors
105 public String parse(final String[] args) throws PolicyApiException {
106 // Clear all our arguments
107 setConfigurationFilePath(null);
109 CommandLine commandLine = null;
111 commandLine = new DefaultParser().parse(options, args);
112 } catch (final ParseException e) {
113 throw new PolicyApiException("invalid command line arguments specified : " + e.getMessage());
116 // Arguments left over after Commons CLI does its stuff
117 final String[] remainingArgs = commandLine.getArgs();
119 if (remainingArgs.length > 0 && commandLine.hasOption('c') || remainingArgs.length > 0) {
120 throw new PolicyApiException("too many command line arguments specified : " + Arrays.toString(args));
123 if (remainingArgs.length == 1) {
124 configurationFilePath = remainingArgs[0];
127 if (commandLine.hasOption('h')) {
128 return help(Main.class.getName());
131 if (commandLine.hasOption('v')) {
135 if (commandLine.hasOption('c')) {
136 setConfigurationFilePath(commandLine.getOptionValue('c'));
143 * Validate the command line options.
145 * @throws PolicyApiException on command argument validation errors
147 public void validate() throws PolicyApiException {
148 validateReadableFile("policy api configuration", configurationFilePath);
152 * Print version information for policy api.
154 * @return the version string
156 public String version() {
157 return ResourceUtils.getResourceAsString("version.txt");
161 * Print help information for policy api.
163 * @param mainClassName the main class name
164 * @return the help string
166 public String help(final String mainClassName) {
167 final HelpFormatter helpFormatter = new HelpFormatter();
168 final StringWriter stringWriter = new StringWriter();
169 final PrintWriter printWriter = new PrintWriter(stringWriter);
171 helpFormatter.printHelp(printWriter, HELP_LINE_LENGTH, mainClassName + " [options...]", "options", options, 0,
174 return stringWriter.toString();
178 * Gets the configuration file path.
180 * @return the configuration file path
182 public String getConfigurationFilePath() {
183 return configurationFilePath;
187 * Gets the full expanded configuration file path.
189 * @return the configuration file path
191 public String getFullConfigurationFilePath() {
192 return ResourceUtils.getFilePath4Resource(getConfigurationFilePath());
196 * Sets the configuration file path.
198 * @param configurationFilePath the configuration file path
200 public void setConfigurationFilePath(final String configurationFilePath) {
201 this.configurationFilePath = configurationFilePath;
206 * Check set configuration file path.
208 * @return true, if check set configuration file path
210 public boolean checkSetConfigurationFilePath() {
211 return configurationFilePath != null && configurationFilePath.length() > 0;
215 * Validate readable file.
217 * @param fileTag the file tag
218 * @param fileName the file name
219 * @throws PolicyApiException on the file name passed as a parameter
221 private void validateReadableFile(final String fileTag, final String fileName) throws PolicyApiException {
222 if (fileName == null || fileName.length() == 0) {
223 throw new PolicyApiException(fileTag + " file was not specified as an argument");
226 // The file name refers to a resource on the local file system
227 final URL fileUrl = ResourceUtils.getUrl4Resource(fileName);
228 if (fileUrl == null) {
229 throw new PolicyApiException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" does not exist");
232 final File theFile = new File(fileUrl.getPath());
233 if (!theFile.exists()) {
234 throw new PolicyApiException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" does not exist");