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78 lines
2.5 KiB
78 lines
2.5 KiB
/*
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* Copyright (C) 2011 The Libphonenumber Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.i18n.phonenumbers;
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/**
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* This class is designed to execute a requested command among a set of provided commands.
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* The dispatching is performed according to the requested command name, which is provided as the
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* first string of the 'args' array. The 'args' array also contains the command arguments available
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* from position 1 to end. The verification of the arguments' consistency is under the
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* responsibility of the command since the dispatcher can't be aware of its underlying goals.
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*
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* @see Command
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* @author Philippe Liard
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*/
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public class CommandDispatcher {
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// Command line arguments passed to the command which will be executed. Note that the first one is
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// the name of the command.
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private final String[] args;
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// Supported commands by this dispatcher.
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private final Command[] commands;
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public CommandDispatcher(String[] args, Command[] commands) {
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this.args = args;
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this.commands = commands;
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}
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/**
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* Executes the command named `args[0]` if any. If the requested command (in args[0]) is not
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* supported, display a help message.
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*
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* <p> Note that the command name comparison is case sensitive.
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*/
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public boolean start() {
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if (args.length != 0) {
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String requestedCommand = args[0];
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for (Command command : commands) {
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if (command.getCommandName().equals(requestedCommand)) {
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command.setArgs(args);
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return command.start();
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}
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}
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}
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displayUsage();
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return false;
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}
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/**
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* Displays a message containing the list of the supported commands by this dispatcher.
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*/
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private void displayUsage() {
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StringBuilder msg = new StringBuilder("Usage: java -jar /path/to/jar [ ");
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int i = 0;
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for (Command command : commands) {
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msg.append(command.getCommandName());
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if (i++ != commands.length - 1) {
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msg.append(" | ");
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}
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}
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msg.append(" ] args");
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System.err.println(msg.toString());
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}
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}
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