Java ReadableByteChannel Read readAllBytesOrNone(ReadableByteChannel channel, ByteBuffer buffer, int numBytes)

Description

read All Bytes Or None

License

Open Source License

Declaration

public static boolean readAllBytesOrNone(ReadableByteChannel channel, ByteBuffer buffer, int numBytes)
            throws IOException 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  . j  a v  a  2s  .c om*/
 * OpenFire - a Java API to access the XFire instant messaging network.
 * Copyright (C) 2007 Iain McGinniss
 * 
 * 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.
    
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.ReadableByteChannel;

public class Main {
    public static boolean readAllBytesOrNone(ReadableByteChannel channel, ByteBuffer buffer, int numBytes)
            throws IOException {
        buffer.rewind();
        buffer.limit(numBytes);

        int totalBytesRead = 0;
        int bytesRead = channel.read(buffer);
        if (bytesRead <= 0) {
            // no bytes available at all
            return false;
        }
        totalBytesRead += bytesRead;
        while (totalBytesRead < numBytes) {
            bytesRead = channel.read(buffer);
            if (bytesRead == -1) {
                throw new IOException("insufficient but non-zero amount of bytes left in channel");
            }

            totalBytesRead += bytesRead;
        }

        buffer.flip();

        return true;
    }
}

Related

1. read(ReadableByteChannel channel, ByteBuffer buffer)
2. read(ReadableByteChannel channel, ByteBuffer[] dsts)
3. read(ReadableByteChannel channel, ByteBuffer[] dsts, int offset, int length)
4. read(ReadableByteChannel channel, int amount, ByteBuffer dest)
5. readAll(ReadableByteChannel ch, ByteBuffer dst)
6. readAnerisHeader(ReadableByteChannel from, ByteBuffer buffer)
7. readBuffer(ReadableByteChannel chan, ByteBuffer buf)
8. readCharArray(ReadableByteChannel channel, ByteBuffer buffer, char[] charArray)
9. readFromAnerisChannel(ReadableByteChannel chan, ByteBuffer buffer)