Argparse4jService.java

package org.pieShare.pieTools.pieUtilities.service.commandParser;

import net.sourceforge.argparse4j.ArgumentParsers;
import net.sourceforge.argparse4j.inf.*;
import org.apache.commons.lang3.Validate;
import org.pieShare.pieTools.pieUtilities.service.commandParser.api.IActionService;
import org.pieShare.pieTools.pieUtilities.service.commandParser.api.ICommandParserService;
import org.pieShare.pieTools.pieUtilities.service.commandParser.exception.CommandParserServiceException;

import java.util.Map;

/**
 * Created by Svetoslav on 29.12.13.
 */
public class Argparse4jService implements ICommandParserService {

	private String programName;
	private ArgumentParser parser;
	private Subparsers subParsers;

	private void init(String name) {
		this.programName = name;
		this.parser = ArgumentParsers.newArgumentParser(name);
		this.subParsers = this.parser.addSubparsers();
	}

	@Override
	public void parseArgs(String[] args) throws CommandParserServiceException {
		try {
			Namespace n = parser.parseArgs(args);
			((IActionService) n.get("func")).doAction(n.getAttrs());
		} catch (ArgumentParserException ex) {
			throw new CommandParserServiceException("Arguments could not be parsed!", ex);
		}
	}

	@Override
	public void registerAction(IActionService action) throws CommandParserServiceException {
		try {
			Validate.notNull(action);
			Validate.notBlank(action.getCommandName());
			Validate.notBlank(action.getProgramName());

			if (this.parser == null) {
				this.init(action.getProgramName());
			} else {
				Validate.matchesPattern(action.getProgramName(), this.programName);
			}

			Subparser parser = this.subParsers.addParser(action.getCommandName()).setDefault("func", action);

			for (Map.Entry<String, Class> entry : action.getArguments().entrySet()) {
				parser.addArgument(entry.getKey()).type(entry.getValue());
			}
		} catch (NullPointerException | IllegalArgumentException ex) {
			throw new CommandParserServiceException("Null value not allowed plus the program and command name must be set!", ex);
		}
	}
}