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.FilterInputStream;

    36 import java.io.IOException;

    37 import java.io.InputStream;

    38 

    39 /**

    40  * InputStream that keeps track of total bytes read (in effect

    41  * 'position' in stream) from the input stream.

    42  *

    43  */

    44 public class PositionInputStream extends FilterInputStream {

    45     private long position = 0L;

    46 

    47     public PositionInputStream(InputStream in) {

    48         super(in);

    49     }

    50 

    51     public int read() throws IOException {

    52         int res = super.read();

    53         if (res != -1) position++;

    54         return res;

    55     }

    56 

    57     public int read(byte[] b, int off, int len) throws IOException {

    58         int res = super.read(b, off, len);

    59         if (res != -1) position += res;

    60         return res;

    61     }

    62 

    63     public long skip(long n) throws IOException {

    64         long res = super.skip(n);

    65         position += res;

    66         return res;

    67     }

    68 

    69     public boolean markSupported() {

    70         return false;

    71     }

    72 

    73     public void mark(int readLimit) {

    74         throw new UnsupportedOperationException("mark");

    75     }

    76 

    77     public void reset() {

    78         throw new UnsupportedOperationException("reset");

    79     }

    80 

    81     public long position() {

    82         return position;

    83     }

    84 }