Read a file return mail headers one at a time
/*
* 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.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.mail.Header;
/**
* Read a file return mail headers one at a time.
*/
public class ReadHeaders {
protected BufferedReader is;
/** Construct */
public ReadHeaders(BufferedReader f) {
is = f;
}
/** Main program showing how to use it */
public static void main(String[] av) {
switch (av.length) {
case 0:
ReadHeaders r = new ReadHeaders(new BufferedReader(
new InputStreamReader(System.in)));
printit(r);
break;
default:
for (int i = 0; i < av.length; i++)
try {
ReadHeaders rr = new ReadHeaders(new BufferedReader(
new FileReader(av[i])));
printit(rr);
} catch (FileNotFoundException e) {
System.err.println(e);
}
break;
}
}
/** Simple demo showing how to use it */
public static void printit(ReadHeaders r) {
while (r.more()) {
Header h = r.next();
System.out.println(h.getValue());
}
}
String inputLine;
/** check to see if more headers available */
public boolean more() {
if (is == null)
return false;
try {
inputLine = is.readLine();
if (inputLine == null || inputLine.length() == 0) {
is.close();
is = null;
}
} catch (IOException e) {
System.out.println("IOException: " + e);
is = null;
return false;
}
return true;
}
public Header next() {
int pos = inputLine.indexOf(":");
if (pos < 0)
return new Header("??", inputLine);
return new Header(inputLine.substring(0, pos), inputLine
.substring(pos + 1));
}
}
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