archive/working/apitools/org.eclipse.wtp.releng.tools.component/src/org/eclipse/wtp/releng/tools/component/util/CommandLineParser.java

/**********************************************************************
 * Copyright (c) 2002, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
�*
 * Contributors:
 *    IBM - Initial API and implementation
 **********************************************************************/

package org.eclipse.wtp.releng.tools.component.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * The command line parser can parse simple command lines into
 * a list of options and arguments.
 * 
 * Consider the following arguments as an example:
 * -myOpt myValue -myOptNoValue -myOpt2 myValue2 myArg1 myArg2
 * 
 * Options in the above command line are:
 * [myOpt, myValue]
 * [myOptNoValue, null]
 * [myOpt2, myValue2]
 * 
 * Arguments are:
 * myArg1, myArg2
 * 
 * The algorithm used supports options without values, but only
 * before other options.  The delimiter for options is hardcoded to
 * be '-'.
 */
public class CommandLineParser {
	private String fDelimiter= "-";
		
	private Map fOptions;
	private List fArguments;
	
	/**
	 * Creates a new command line parser on the given arguments.
	 * @param args the arguments to be parsed, not <code>null</code>.
	 */
	public CommandLineParser(String[] args) {
		parse(args);
	}
	
	/**
	 * Answers the key-value pairs of options.
	 * Note: The delimiter '-' will be removed from the names
	 * of all options.
	 * @return Map the options, or an empty map, not <code>null</code>.
	 */
	public Map getOptions() {
		return fOptions;
	}
	
	/**
	 * Answers the list of arguments.
	 * @return List the list of arguments or an empty list, not <code>null</code>.
	 */
	public List getArguments() {
		return fArguments;
	}
	
	private void parse(String[] args) {
		fOptions= new HashMap();
		fArguments= new ArrayList();
		String argument= null;
		for(int i= 0; i < args.length; i++) {
			String arg= args[i];
			if (arg != null) { 
				if (arg.startsWith(fDelimiter)) {
					argument= arg.substring(1);
					fOptions.put(argument, null);
				} else {
					if (argument == null) {
						for(; i < args.length; i++) {
							fArguments.add(args[i]);
						}
					} else {
						fOptions.put(argument, arg);
						argument= null;
					}
				}
			}
		}
	}
}