com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream.java Source code

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Here is the source code for com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.io.unsync;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import java.nio.ByteBuffer;

/**
 * <p>
 * See https://issues.liferay.com/browse/LPS-6648.
 * </p>
 *
 * @author Shuyang Zhou
 */
public class UnsyncByteArrayOutputStream extends OutputStream {

    public UnsyncByteArrayOutputStream() {
        this(32);
    }

    public UnsyncByteArrayOutputStream(int size) {
        buffer = new byte[size];
    }

    public void reset() {
        index = 0;
    }

    public int size() {
        return index;
    }

    public byte[] toByteArray() {
        byte[] newBuffer = new byte[index];

        System.arraycopy(buffer, 0, newBuffer, 0, index);

        return newBuffer;
    }

    @Override
    public String toString() {
        return new String(buffer, 0, index);
    }

    public String toString(String charsetName) throws UnsupportedEncodingException {

        return new String(buffer, 0, index, charsetName);
    }

    public byte[] unsafeGetByteArray() {
        return buffer;
    }

    public ByteBuffer unsafeGetByteBuffer() {
        return ByteBuffer.wrap(buffer, 0, index);
    }

    @Override
    public void write(byte[] bytes) {
        write(bytes, 0, bytes.length);
    }

    @Override
    public void write(byte[] bytes, int offset, int length) {
        if (length <= 0) {
            return;
        }

        int newIndex = index + length;

        if (newIndex > buffer.length) {
            int newBufferSize = Math.max(buffer.length << 1, newIndex);

            byte[] newBuffer = new byte[newBufferSize];

            System.arraycopy(buffer, 0, newBuffer, 0, index);

            buffer = newBuffer;
        }

        System.arraycopy(bytes, offset, buffer, index, length);

        index = newIndex;
    }

    @Override
    public void write(int b) {
        int newIndex = index + 1;

        if (newIndex > buffer.length) {
            int newBufferSize = Math.max(buffer.length << 1, newIndex);

            byte[] newBuffer = new byte[newBufferSize];

            System.arraycopy(buffer, 0, newBuffer, 0, buffer.length);

            buffer = newBuffer;
        }

        buffer[index] = (byte) b;

        index = newIndex;
    }

    public void writeTo(OutputStream outputStream) throws IOException {
        outputStream.write(buffer, 0, index);
    }

    protected byte[] buffer;
    protected int index;

}