/*

 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.

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

 *

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

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

 * published by the Free Software Foundation.  Oracle designates this

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

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

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

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

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

 * questions.

 */

package jdk.internal.reflect;

class ByteVectorImpl implements ByteVector {

    private byte[] data;

    private int pos;

    public ByteVectorImpl() {

        this(100);

    }

    public ByteVectorImpl(int sz) {

        data = new byte[sz];

        pos = -1;

    }

    public int getLength() {

        return pos + 1;

    }

    public byte get(int index) {

        if (index >= data.length) {

            resize(index);

            pos = index;

        }

        return data[index];

    }

    public void put(int index, byte value) {

        if (index >= data.length) {

            resize(index);

            pos = index;

        }

        data[index] = value;

    }

    public void add(byte value) {

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

            resize(pos);

        }

        data[pos] = value;

    }

    public void trim() {

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

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

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

            data = newData;

        }

    }

    public byte[] getData() {

        return data;

    }

    private void resize(int minSize) {

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

            minSize = 2 * data.length;

        }

        byte[] newData = new byte[minSize];

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

        data = newData;

    }

}