alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Android example source code file (Svc.java)

This example Android source code file (Svc.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

command, command_help, commands, datacommand, n, powercommand, show, string, svc, wificommand

The Svc.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.commands.svc;

public class Svc {

    public static abstract class Command {
        private String mName;

        public Command(String name) {
            mName = name;
        }

        public String name() {
            return mName;
        }

        public abstract String shortHelp();         // should fit on one short line
        public abstract String longHelp();          // take as much space as you need, 75 col max
        public abstract void run(String[] args);    // run the command
    }

    public static void main(String[] args) {
        if (args.length >= 1) {
            Command c = lookupCommand(args[0]);
            if (c != null) {
                c.run(args);
                return;
            }
        }
        COMMAND_HELP.run(args);
    }

    private static Command lookupCommand(String name) {
        final int N = COMMANDS.length;
        for (int i=0; i<N; i++) {
            Command c = COMMANDS[i];
            if (c.name().equals(name)) {
                return c;
            }
        }
        return null;
    }

    public static final Command COMMAND_HELP = new Command("help") {
        public String shortHelp() {
            return "Show information about the subcommands";
        }
        public String longHelp() {
            return shortHelp();
        }
        public void run(String[] args) {
            if (args.length == 2) {
                Command c = lookupCommand(args[1]);
                if (c != null) {
                    System.err.println(c.longHelp());
                    return;
                }
            }

            System.err.println("Available commands:");
            final int N = COMMANDS.length;
            int maxlen = 0;
            for (int i=0; i<N; i++) {
                Command c = COMMANDS[i];
                int len = c.name().length();
                if (maxlen < len) {
                    maxlen = len;
                }
            }
            String format = "    %-" + maxlen + "s    %s";
            for (int i=0; i<N; i++) {
                Command c = COMMANDS[i];
                System.err.println(String.format(format, c.name(), c.shortHelp()));
            }
        }
    };

    public static final Command[] COMMANDS = new Command[] {
            COMMAND_HELP,
            new PowerCommand(),
            new DataCommand(),
            new WifiCommand()
    };
}

Other Android examples (source code examples)

Here is a short list of links related to this Android Svc.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.