1 /** 2 * Copyright 2007 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.tonicsystems.jarjar; 18 19 import java.io.File; 20 import java.lang.reflect.InvocationTargetException; 21 import java.lang.reflect.Method; 22 import java.util.ArrayList; 23 import java.util.List; 24 25 class MainUtil 26 { runMain(Object main, String[] args, String defCommand)27 public static void runMain(Object main, String[] args, String defCommand) throws Exception { 28 if (args.length > 0) { 29 String command = args[0]; 30 Method[] methods = main.getClass().getMethods(); 31 for (int i = 0; i < methods.length; i++) { 32 Method method = methods[i]; 33 if (method.getName().equals(command)) { 34 String[] remaining = new String[args.length - 1]; 35 System.arraycopy(args, 1, remaining, 0, remaining.length); 36 try { 37 method.invoke(main, bindParameters(method, remaining)); 38 } catch (InvocationTargetException e) { 39 Throwable cause = e.getCause(); 40 if (cause instanceof IllegalArgumentException) { 41 System.err.println("Syntax error: " + cause.getMessage()); 42 } else if (cause instanceof Exception) { 43 throw (Exception) cause; 44 } else { 45 throw e; 46 } 47 } 48 return; 49 } 50 } 51 } 52 if (defCommand != null) 53 runMain(main, new String[]{ defCommand }, null); 54 } 55 bindParameters(Method method, String[] args)56 private static Object[] bindParameters(Method method, String[] args) { 57 List<Object> parameters = new ArrayList<Object>(); 58 Class[] parameterTypes = method.getParameterTypes(); 59 for (int i = 0, len = parameterTypes.length; i < len; i++) { 60 Class type = parameterTypes[i]; 61 int remaining = Math.max(0, args.length - i); 62 if (type.equals(String[].class)) { 63 String[] rest = new String[remaining]; 64 System.arraycopy(args, 1, rest, 0, remaining); 65 parameters.add(rest); 66 } else if (remaining > 0) { 67 parameters.add(convertParameter(args[i], parameterTypes[i])); 68 } else { 69 parameters.add(null); 70 } 71 } 72 return parameters.toArray(); 73 } 74 convertParameter(String arg, Class type)75 private static Object convertParameter(String arg, Class type) { 76 if (type.equals(String.class)) { 77 return arg; 78 } else if (type.equals(Integer.class)) { 79 return Integer.valueOf(arg, 10); 80 } else if (type.equals(File.class)) { 81 return new File(arg); 82 } else { 83 throw new UnsupportedOperationException("Unknown type " + type); 84 } 85 } 86 } 87