list.Main.java Source code

Introduction

Here is the source code for list.Main.java

Source

/*
 *  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.
 *
 */
package list;

import java.io.File;
import java.util.Collection;
import java.util.Iterator;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

public final class Main {
    private static Options getOptions() {
        Option dir = OptionBuilder.withArgName("dir").hasArg().withDescription("list files in given dir")
                .create("dir");
        Options options = new Options();

        options.addOption(dir);

        return options;
    }

    public static void main(String[] args) throws Exception {
        Options options = getOptions();
        try {

            CommandLineParser parser = new GnuParser();

            CommandLine line = parser.parse(options, args);
            File dir = new File(line.getOptionValue("dir", "."));
            Collection files = ListFile.list(dir);
            System.out.println("listing files in " + dir);
            for (Iterator it = files.iterator(); it.hasNext();) {
                System.out.println("\t" + it.next() + "\n");
            }
        } catch (ParseException exp) {
            // oops, something went wrong
            System.err.println("Parsing failed.  Reason: " + exp.getMessage());

            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp("list", options);
        }
    }

    private Main() {
    }

}