1/* 2 * Copyright (C) 2011 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 15package com.google.caliper.util; 16 17import java.io.PrintWriter; 18 19/** 20 * Exception used to abort command-line processing because the user has asked for help (using either 21 * --help or -h). 22 */ 23@SuppressWarnings("serial") // who would serialize a command-line parsing error? 24public final class DisplayUsageException extends InvalidCommandException { 25 public DisplayUsageException() { 26 super("(User asked for --help. This message should not appear anywhere.)"); 27 } 28 29 @Override public void display(PrintWriter writer) { 30 displayUsage(writer); 31 } 32 33 @Override public int exitCode() { 34 return 0; 35 } 36} 37