1 /******************************************************************************* 2 * Copyright (c) 2000, 2006 IBM Corporation and others. 3 * All rights reserved. This program and the accompanying materials 4 * are made available under the terms of the Eclipse Public License v1.0 5 * which accompanies this distribution, and is available at 6 * http://www.eclipse.org/legal/epl-v10.html 7 * 8 * Contributors: 9 * IBM Corporation - initial API and implementation 10 *******************************************************************************/ 11 package org.eclipse.releng.generators; 12 13 import java.util.ArrayList; 14 import java.util.List; 15 16 /** 17 * Defines common behaviour for PDE Core applications. 18 */ 19 public abstract class AbstractApplication { 20 21 /** 22 * Starting point for application logic. 23 */ 24 protected abstract void run() throws Exception; 25 26 /* 27 * @see IPlatformRunnable#run(Object) 28 */ 29 public Object run(Object args) throws Exception { 30 processCommandLine(getArrayList((String[]) args)); 31 try { 32 run(); 33 } catch (Exception e) { 34 e.printStackTrace(System.out); 35 } 36 return null; 37 } 38 39 /** 40 * Helper method to ensure an array is converted into an ArrayList. 41 */ 42 public static ArrayList getArrayList(Object[] args) { 43 // We could be using Arrays.asList() here, but it does not specify 44 // what kind of list it will return. We do need a list that 45 // implements the method List.remove(int) and ArrayList does. 46 ArrayList result = new ArrayList(args.length); 47 for (int i = 0; i < args.length; i++) 48 result.add(args[i]); 49 return result; 50 } 51 52 53 54 55 /** 56 * Looks for interesting command line arguments. 57 */ 58 protected void processCommandLine(List commands) { 59 } 60 61 /** 62 * From a command line list, get the array of arguments of a given parameter. 63 * The parameter and its arguments are removed from the list. 64 * @return null if the parameter is not found or has no arguments 65 */ 66 protected String[] getArguments(List commands, String param) { 67 int index = commands.indexOf(param); 68 if (index == -1) 69 return null; 70 commands.remove(index); 71 if (index == commands.size()) // if this is the last command 72 return null; 73 List args = new ArrayList(commands.size()); 74 while (index < commands.size()) { // while not the last command 75 String command = (String) commands.get(index); 76 if (command.startsWith("-")) // is it a new parameter? 77 break; 78 args.add(command); 79 commands.remove(index); 80 } 81 if (args.isEmpty()) 82 return null; 83 return (String[]) args.toArray(new String[args.size()]); 84 } 85 86 87 88 89 } 90
