DropReceivedLines.java Source code

Introduction

Here is the source code for DropReceivedLines.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.io.*;

/**
 * Read a file and print, using LineReader and System.out
 */
public class DropReceivedLines {

    public static void main(String[] av) {
        DropReceivedLines d = new DropReceivedLines();
        // For stdin, act as a filter. For named files,
        // update each file in place (safely, by creating a new file).
        try {
            if (av.length == 0)
                d.process(new BufferedReader(new InputStreamReader(System.in)), new PrintWriter(System.out));
            else
                for (int i = 0; i < av.length; i++)
                    d.process(av[i]);
        } catch (FileNotFoundException e) {
            System.err.println(e.getMessage());
        } catch (IOException e) {
            System.err.println("I/O error " + e);
        }
    }

    protected static File tempFile = new File("holding.tmp");

    /** Process one file given only its name */
    public void process(String fileName) throws IOException {
        File old = new File(fileName);
        String newFileName = fileName + ".TMP";
        File newf = new File(newFileName);
        BufferedReader is = new BufferedReader(new FileReader(fileName));
        PrintWriter p = new PrintWriter(new FileWriter(newFileName));
        process(is, p); // call other process(), below
        p.close();
        old.renameTo(tempFile);
        newf.renameTo(old);
        tempFile.delete();
    }

    /** process one file, given an open LineReader */
    public void process(BufferedReader is, PrintWriter out) throws IOException {
        try {
            String lin;

            // If line begins with "Received:", ditch it, and its continuations
            while ((lin = is.readLine()) != null) {
                if (lin.startsWith("Received:")) {
                    do {
                        lin = is.readLine();
                    } while (lin.length() > 0 && Character.isWhitespace(lin.charAt(0)));
                }
                out.println(lin);
            }
            is.close();
            out.close();
        } catch (IOException e) {
            System.out.println("IOException: " + e);
        }
    }
}