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Sunday, 1 July 2018

Apache Commons CLI - Posix Parser

Apache Commons CLI - Posix Parser


A Posix parser is use to parse Posix like arguments passed. It is now deprecated and is replaced by DefaultParser.

Example

CLITester.java
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.PosixParser;

public class CLITester {
   public static void main(String[] args) throws ParseException {
   
      //Create posix like options
      Options posixOptions = new Options();
      posixOptions.addOption("D", false, "Display");
      posixOptions.addOption("A", false, "Act");

      CommandLineParser posixParser = new PosixParser();

      CommandLine cmd = posixParser.parse(posixOptions, args);

      if( cmd.hasOption("D") ) {
         System.out.println("D option was used.");
      }

      if( cmd.hasOption("A") ) {
         System.out.println("A option was used.");
      }
   } 
}

Output

Run the file while passing -D -A as options and see the result.
java CLITester -D -A
D option was used.
A option was used.
Run the file while passing --D as option and see the result.
java CLITester --D
D option was used.

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