org.codehaus.mojo.macker.CommandLineFile.java Source code

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Here is the source code for org.codehaus.mojo.macker.CommandLineFile.java

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package org.codehaus.mojo.macker;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.IOUtils;

/**
 * Wrapper for calling a Java main method with a number of arguments.
 * @author <a href="http://www.code-cop.org/">Peter Kofler</a>
 */
public class CommandLineFile {

    public static void main(String[] args) throws Exception {
        if (args.length == 0 || args.length > 2) {
            System.err.println("Usage: CommandLineFile <main class> [command line arguments file]");
            System.exit(1);
        }

        String className = args[0];
        Class clazz = Class.forName(className);
        Method main = clazz.getMethod("main", new Class[] { String[].class });

        List/*<String>*/ lines = new ArrayList/*<String>*/();
        if (args.length == 2) {
            Reader in = new InputStreamReader(new FileInputStream(args[1]), "UTF-8");
            try {
                lines = IOUtils.readLines(in);
            } finally {
                in.close();
            }
        }

        try {
            main.invoke(null, new Object[] { lines.toArray(new String[lines.size()]) });
        } catch (InvocationTargetException ex) {
            Throwable cause = ex.getTargetException();
            if (cause instanceof Error) {
                throw (Error) cause;
            }
            throw (Exception) cause;
        }
    }
}