aliascommand.java

纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统

/*
 * $Id: AliasCommand.java,v 1.1 2003/11/25 11:52:58 epr Exp $
 */
package org.jnode.shell.command;

import java.util.Iterator;

import javax.naming.NameNotFoundException;

import org.jnode.shell.Shell;
import org.jnode.shell.ShellUtils;
import org.jnode.shell.alias.AliasManager;
import org.jnode.shell.alias.NoSuchAliasException;
import org.jnode.shell.help.*;

/**
 * @author epr
 * @author qades
 */
public class AliasCommand {

        static final AliasArgument ARG_ALIAS = new AliasArgument("alias", "the alias");
	static final ClassNameArgument ARG_CLASS = new ClassNameArgument("classname", "the classname");
	static final Parameter PARAM_REMOVE = new Parameter("r", "following alias will be removed", ARG_ALIAS, Parameter.MANDATORY);

	public static Help.Info HELP_INFO = new Help.Info(
		"alias", new Syntax[] {
			new Syntax("Print all available aliases and corresponding classnames"),
			new Syntax("Set an aliases for given classnames",
				new Parameter[] {
					new Parameter(ARG_ALIAS, Parameter.MANDATORY),
					new Parameter(ARG_CLASS, Parameter.MANDATORY)
				}
			), new Syntax("Remove an alias",
				new Parameter[] {
					PARAM_REMOVE
				}
			)
		});

	public static void main(String[] args) throws NoSuchAliasException, NameNotFoundException {
		ParsedArguments cmdLine = HELP_INFO.parse(args);

		final Shell shell = ShellUtils.getShellManager().getCurrentShell();
		final AliasManager aliasMgr = shell.getAliasManager();

		if (cmdLine.size() == 0) {
			for (Iterator i = aliasMgr.aliasIterator(); i.hasNext();) {
				final String alias = (String) i.next();
				System.out.println(alias + ":\t" + aliasMgr.getAliasClassName(alias));
			}
		} else if (PARAM_REMOVE.isSet(cmdLine)) {
			// remove an alias
			aliasMgr.remove(ARG_ALIAS.getValue(cmdLine));
		} else {
			// add an alias
			aliasMgr.add(ARG_ALIAS.getValue(cmdLine), ARG_CLASS.getValue(cmdLine));
		}
	}
}