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/*
* Copyright 2007 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 com.tonicsystems.jarjar;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
class MainUtil {
public static void runMain(Object main, String[] args, String defCommand) throws Exception {
if (args.length > 0) {
String command = args[0];
Method[] methods = main.getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (method.getName().equals(command)) {
String[] remaining = new String[args.length - 1];
System.arraycopy(args, 1, remaining, 0, remaining.length);
try {
method.invoke(main, bindParameters(method, remaining));
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
if (cause instanceof IllegalArgumentException) {
System.err.println("Syntax error: " + cause.getMessage());
} else if (cause instanceof Exception) {
throw (Exception) cause;
} else {
throw e;
}
}
return;
}
}
}
if (defCommand != null) {
runMain(main, new String[] {defCommand}, null);
}
}
private static Object[] bindParameters(Method method, String[] args) {
List<Object> parameters = new ArrayList<Object>();
Class[] parameterTypes = method.getParameterTypes();
for (int i = 0, len = parameterTypes.length; i < len; i++) {
Class type = parameterTypes[i];
int remaining = Math.max(0, args.length - i);
if (type.equals(String[].class)) {
String[] rest = new String[remaining];
System.arraycopy(args, 1, rest, 0, remaining);
parameters.add(rest);
} else if (remaining > 0) {
parameters.add(convertParameter(args[i], parameterTypes[i]));
} else {
parameters.add(null);
}
}
return parameters.toArray();
}
private static Object convertParameter(String arg, Class type) {
if (type.equals(String.class)) {
return arg;
} else if (type.equals(Integer.class)) {
return Integer.valueOf(arg, 10);
} else if (type.equals(File.class)) {
return new File(arg);
} else {
throw new UnsupportedOperationException("Unknown type " + type);
}
}
}
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