Java Reader Copy copyLarge(Reader input, Writer output)

Description

Copy chars from a large (over 2GB) Reader to a Writer.

License

Open Source License

Parameter

Parameter	Description
input	the <code>Reader</code> to read from
output	the <code>Writer</code> to write to

Exception

Parameter	Description
NullPointerException	if the input or output is null
IOException	if an I/O error occurs

Return

the number of characters copied

Declaration

public static long copyLarge(Reader input, Writer output) throws IOException 

Method Source Code

//package com.java2s;
/*/*from   w  w  w . j ava  2s .  com*/
 * The MIT License
 *
 * Copyright (c) 2009, 2010 Stefan Saasen
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.IOException;

import java.io.Reader;

import java.io.Writer;

public class Main {
    /**
     * The default buffer size to use.
     */
    private static final int BUFFER_SIZE = 4 * 1024;

    /**
     * Copy chars from a large (over 2GB) <code>Reader</code> to a
     * <code>Writer</code>.
     * <p>
     * This method buffers the input internally, so there is no need to use a
     * <code>BufferedReader</code>.
     * 
     * @param input
     *            the <code>Reader</code> to read from
     * @param output
     *            the <code>Writer</code> to write to
     * @return the number of characters copied
     * @throws NullPointerException
     *             if the input or output is null
     * @throws IOException
     *             if an I/O error occurs
     * @since Commons IO 1.3
     */
    public static long copyLarge(Reader input, Writer output) throws IOException {
        char[] buffer = new char[BUFFER_SIZE];
        long count = 0;
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
    }
}

Related

1. copyLarge(Reader input, Writer output)
2. copyLarge(Reader input, Writer output)
3. copyLarge(Reader input, Writer output)
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9. copyLarge(Reader input, Writer output)