Java Reader Copy copyLarge(Reader input, Writer output, char[] buffer)

Description

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

License

Apache License

Parameter

Parameter	Description
input	the <code>Reader</code> to read from
output	the <code>Writer</code> to write to
buffer	the buffer to be used for the copy

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, char[] buffer) throws IOException 

Method Source Code

//package com.java2s;
/*// w  w w .  ja  va 2 s.  com
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;

import java.io.Reader;

import java.io.Writer;

public class Main {
    private static final int EOF = -1;
    /**
     * The default buffer size ({@value}) to use for 
     * {@link #copyLarge(InputStream, OutputStream)}
     * and
     * {@link #copyLarge(Reader, Writer)}
     */
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    /**
     * 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>.
     * <p>
     * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}.
     *
     * @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 1.3
     */
    public static long copyLarge(Reader input, Writer output) throws IOException {
        return copyLarge(input, output, new char[DEFAULT_BUFFER_SIZE]);
    }

    /**
     * Copy chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>.
     * <p>
     * This method uses the provided buffer, so there is no need to use a
     * <code>BufferedReader</code>.
     * <p>
     *
     * @param input  the <code>Reader</code> to read from
     * @param output  the <code>Writer</code> to write to
     * @param buffer the buffer to be used for the copy
     * @return the number of characters copied
     * @throws NullPointerException if the input or output is null
     * @throws IOException if an I/O error occurs
     * @since 2.2
     */
    public static long copyLarge(Reader input, Writer output, char[] buffer) throws IOException {
        long count = 0;
        int n = 0;
        while (EOF != (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)
4. copyLarge(Reader input, Writer output)
5. copyLarge(Reader input, Writer output)
6. copyLarge(Reader input, Writer output, char[] buffer)
7. copyLarge(Reader input, Writer output, char[] buffer)
8. copyLarge(Reader input, Writer output, final long inputOffset, final long length, char[] buffer)
9. copyLarge(Reader input, Writer output, long limit)