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Commons CLI API - Option.Builder Class
How to use org.apache.commons.cli.Option.Builder class to define options?
✍: FYIcenter.com
Commons CLI API offers 3 ways to define options:
1. Define and add an option in a single addOption() call - For example:
import org.apache.commons.cli.Options; options.addOption("i", "input", true, "Input string");
2. Define an option with Option class first - The Option class gives you more control on how the option should behave. For example:
import org.apache.commons.cli.Option; import org.apache.commons.cli.Options; Option input = new Option("i", "input", true, "Input string"); options.addOption(input);
3. Define an option with Option.Builder class first - The Option.Builder class gives you full control on how the option should behave. For example:
import org.apache.commons.cli.Option; import org.apache.commons.cli.Option.Builder; import org.apache.commons.cli.Options; builder = Option.builder("i"); builder = builder.longOpt("input"); builder = builder.desc("Input string"); builder = builder.hasArg(true); builder = builder.argName("name"); Option input = builder.build(); options.addOption(input);
Here is good Java example of using org.apache.commons.cli.Option class to define options with Commons CLI API, ShortOptionTest.java:
// Copyright (c) 2018 FYIcenter.com import org.apache.commons.cli.Option; import org.apache.commons.cli.Option.Builder; import org.apache.commons.cli.Options; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.DefaultParser; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.UnrecognizedOptionException; public class OptionBuilderTest { public static void main(String[] args) throws Exception { Options options = new Options(); // Define a short option: -h Option.Builder builder = Option.builder("h"); builder = builder.desc("Print this help message"); Option help = builder.build(); options.addOption(help); // Define a long option: --version -version -v builder = Option.builder("v"); builder = builder.desc("Print version info"); builder = builder.longOpt("version"); Option version = builder.build(); options.addOption(version); // Define a short option with argument: -n 3 builder = Option.builder("n"); builder = builder.desc("Number of output lines"); builder = builder.hasArg(true); Option n = builder.build(); options.addOption(n); // Define a long option with argument: --input ..., -input ..., -i ... builder = Option.builder("i"); builder = builder.longOpt("input"); builder = builder.desc("Input string"); builder = builder.hasArg(true); builder = builder.argName("name"); Option input = builder.build(); options.addOption(input); try { // Parse options CommandLineParser parser = new DefaultParser(); CommandLine cmd = parser.parse(options, args); int lines = 1; if (cmd.hasOption("n")) { lines = Integer.parseInt(cmd.getOptionValue("n")); } if (cmd.hasOption("h")) { help(options); } else if (cmd.hasOption("version")) { System.out.println("OptionClassTest version 1.0.0"); } else if (cmd.hasOption("input")) { for (int i=0; i<lines; i++) { System.out.println("Hello "+cmd.getOptionValue("input")); } } } catch (UnrecognizedOptionException e) { System.out.println("Invalid options: "+e.getOption()); help(options); } } public static void help(Options options) { // Print options HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("OptionBuilderTest", options); } }
You can compile and run it with commons-cli-1.4.jar:
C:\fyicenter>javac -cp C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar OptionBuilderTest.java C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar OptionBuilderTest -h usage: OptionBuilderTest -h Print this help message -i,--input <name> Input string -n <arg> Number of output lines -v,--version Print version info C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar OptionBuilderTest --version OptionBuilderTest version 1.0.0 C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar OptionBuilderTest -i world Hello world C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar OptionBuilderTest -i world -n 3 Hello world Hello world Hello world
⇒ FAQ for Apache Commons CLI JAR Library
⇐ Commons CLI API - Option Class
2020-05-15, 1393🔥, 0💬
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