opt.java

aglet的部分源码

package com.ibm.awb.misc;

import java.util.*;

/*
 * @(#)Opt.java
 * 
 * IBM Confidential-Restricted
 * 
 * OCO Source Materials
 * 
 * 03L7246 (c) Copyright IBM Corp. 1996, 1998
 * 
 * The source code for this program is not published or otherwise
 * divested of its trade secrets, irrespective of what has been
 * deposited with the U.S. Copyright Office.
 */

abstract public class Opt {

	static Hashtable opts = new Hashtable();
	static Vector v = new Vector();

	static public interface Proc {
		public boolean exec(String a) throws Exception;
	}

	private String name;
	private String message;

	static class VOpt extends Opt {
		private String prop_name;

		VOpt(String n, String p, String m) {
			super(n, m);
			prop_name = p;
		}

		public boolean match(String val) {
			if (val == null) {
				return false;
			} 
			System.getProperties().put(prop_name, val);
			return true;
		} 
	}
	;

	static class SOpt extends Opt {
		String prop_name;
		String svalue;

		SOpt(String n, String p, String v, String m) {
			super(n, m);
			prop_name = p;
			svalue = v;
		}

		public boolean match(String val) {
			if (val != null) {
				return false;
			} 
			System.getProperties().put(prop_name, svalue);
			return true;
		} 
	}
	;

	static class POpt extends Opt {
		Proc proc;

		POpt(String n, Proc r, String m) {
			super(n, m);
			proc = r;
		}

		public boolean match(String val) {
			try {
				return proc.exec(val);
			} catch (Exception ex) {
				ex.printStackTrace();
				return false;
			} 
		} 
	}
	;

	static class DOpt extends Opt {

		DOpt(String n) {
			super(n, null);
		}
		public boolean match(String val) {
			return true;
		} 
	}
	;

	static Opt o[] = {
		Opt.Entry("-help", new Proc() {
			public boolean exec(String a) {
				message();
				return true;
			} 
		}, " -help        print this message"), Opt
	.Entry("-verbose", "verbose", "true", " -verbose     turn on verbose mode"), Opt
		.Entry("-port", "port", " -port <port> set the port number"), 
	};

	Opt(String n, String m) {
		name = n;
		message = m;
	}
	static public boolean checkopt(String args[]) {
		if (args == null) {
			return true;
		} 
		for (int i = 0; i < args.length; i++) {
			if (args[i] != null) {
				message();
				return false;
			} 
		} 
		return true;
	}
	static public Opt Entry(String n) {
		return new DOpt(n);
	}
	static public Opt Entry(String n, Proc r, String m) {
		return new POpt(n, r, m);
	}
	static public Opt Entry(String n, String p, String m) {
		return new VOpt(n, p, m);
	}
	static public Opt Entry(String n, String p, String val, String m) {
		return new SOpt(n, p, val, m);
	}
	static public void getopt(String args[]) {
		if (args == null) {
			return;
		} 
		Properties props = System.getProperties();

		for (int i = 0; i < args.length; i++) {
			if (args[i] == null) {
				continue;
			} 
			Opt r = (Opt)opts.get(args[i]);

			if (r == null) {
				return;
			} 
			args[i] = null;
			String v = null;

			if ((i + 1) < args.length && args[i + 1] != null 
					&& args[i + 1].charAt(0) != '-') {
				v = args[i + 1];
			} 
			if (r.match(v)) {
				args[i] = null;
				if (v != null) {
					i++;
					args[i] = null;
				} 
			} 
		} 
	}
	static public String getopt(String val, String args[], String def_value) {
		if (args == null) {
			return def_value;
		} 
		for (int i = 0; i < args.length; i++) {
			if (args[i].startsWith(val)) {
				if ((i + 1) < args.length && args[i + 1].charAt(0) != '-') {
					return args[i + 1];
				} 
			} 
		} 
		return def_value;
	}
	static public void main(String args[]) {
		Opt.getopt(args);
		Opt.checkopt(args);
		if (Boolean.getBoolean("help")) {
			Opt.message();
			System.exit(0);
		} 
		System.out.println(Integer.getInteger("port", -99));
		System.out.println(Boolean.getBoolean("verbose"));
	}
	abstract boolean match(String arg);
	static public void message() {
		Enumeration e = v.elements();
		String name = System.getProperty("program-name", 
										 "java com.ibm.aglets.tahiti.Main");

		System.err.println("usage: " + name + " [-options] \n" 
						   + "where options include: \n");
		while (e.hasMoreElements()) {
			Opt r = (Opt)e.nextElement();

			if (r.message != null) {
				System.err.println(r.message);
			} 
		} 
	}
	static public void setopt(Opt[] options) {
		for (int i = 0; i < options.length; i++) {
			opts.put(options[i].name, options[i]);
			v.addElement(options[i]);
		} 
	}
}