org.onebusaway.cli.CommandLineInterfaceLibrary Maven / Gradle / Ivy

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/**
 * Copyright (C) 2012 Google, Inc.
 *
 * 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 org.onebusaway.cli;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class CommandLineInterfaceLibrary {

  public static boolean wantsHelp(String[] args) {
    if (args.length == 0) {
      return false;
    }
    String first = args[0].toLowerCase();
    while (first.startsWith("-")) {
      first = first.substring(1);
    }
    return first.equals("h") || first.equals("help") || first.equals("?");
  }

  public static void printUsage(Class mainClass) {
    InputStream is = mainClass.getResourceAsStream("usage.txt");
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    String line = null;
    try {
      while ((line = reader.readLine()) != null) {
        System.err.println(line);
      }
    } catch (IOException ex) {

    } finally {
      if (reader != null) {
        try {
          reader.close();
        } catch (IOException ex) {

        }
      }
    }
  }
}