1 /*

     2  * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 

    27 /*

    28  * The Original Code is HAT. The Initial Developer of the

    29  * Original Code is Bill Foote, with contributions from others

    30  * at JavaSoft/Sun.

    31  */

    32 

    33 package com.sun.tools.hat.internal.parser;

    34 

    35 import java.io.DataInputStream;

    36 import java.io.InputStream;

    37 

    38 /**

    39  * A DataInputStream that keeps track of total bytes read

    40  * (in effect 'position' in stream) so far.

    41  *

    42  */

    43 public class PositionDataInputStream extends DataInputStream {

    44     public PositionDataInputStream(InputStream in) {

    45         super(in instanceof PositionInputStream?

    46               in : new PositionInputStream(in));

    47     }

    48 

    49     public boolean markSupported() {

    50         return false;

    51     }

    52 

    53     public void mark(int readLimit) {

    54         throw new UnsupportedOperationException("mark");

    55     }

    56 

    57     public void reset() {

    58         throw new UnsupportedOperationException("reset");

    59     }

    60 

    61     public long position() {

    62         return ((PositionInputStream)in).position();

    63     }

    64 }