1 /*

     2  * Copyright (c) 2001, 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 package sun.reflect;

    27 

    28 class ByteVectorImpl implements ByteVector {

    29     private byte[] data;

    30     private int pos;

    31 

    32     public ByteVectorImpl() {

    33         this(100);

    34     }

    35 

    36     public ByteVectorImpl(int sz) {

    37         data = new byte[sz];

    38         pos = -1;

    39     }

    40 

    41     public int getLength() {

    42         return pos + 1;

    43     }

    44 

    45     public byte get(int index) {

    46         if (index >= data.length) {

    47             resize(index);

    48             pos = index;

    49         }

    50         return data[index];

    51     }

    52 

    53     public void put(int index, byte value) {

    54         if (index >= data.length) {

    55             resize(index);

    56             pos = index;

    57         }

    58         data[index] = value;

    59     }

    60 

    61     public void add(byte value) {

    62         if (++pos >= data.length) {

    63             resize(pos);

    64         }

    65         data[pos] = value;

    66     }

    67 

    68     public void trim() {

    69         if (pos != data.length - 1) {

    70             byte[] newData = new byte[pos + 1];

    71             System.arraycopy(data, 0, newData, 0, pos + 1);

    72             data = newData;

    73         }

    74     }

    75 

    76     public byte[] getData() {

    77         return data;

    78     }

    79 

    80     private void resize(int minSize) {

    81         if (minSize <= 2 * data.length) {

    82             minSize = 2 * data.length;

    83         }

    84         byte[] newData = new byte[minSize];

    85         System.arraycopy(data, 0, newData, 0, data.length);

    86         data = newData;

    87     }

    88 }