Gather ByteBuffers to one ByteBuffer. - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

Gather ByteBuffers to one ByteBuffer.

Demo Code

/*/*w  w w. j  a  v a 2  s . c  o  m*/
 * Copyright 2004-2005 the original author or authors.
 *
 * Licensed 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.
 */
//package com.java2s;
import java.nio.ByteBuffer;

public class Main {
    /**
     * Gather ByteBuffers to one ByteBuffer.
     * 
     * @param buffers
     *       ByteBuffers
     * @return
     *       the gather ByteBuffer
     */
    public static ByteBuffer gather(ByteBuffer[] buffers) {
        int remaining = 0;
        for (int i = 0; i < buffers.length; i++) {
            if (buffers[i] != null)
                remaining += buffers[i].remaining();
        }
        ByteBuffer result = ByteBuffer.allocate(remaining);
        for (int i = 0; i < buffers.length; i++) {
            if (buffers[i] != null)
                result.put(buffers[i]);
        }
        result.flip();
        return result;
    }

    /**
     * Allocate ByteBuffer.
     * 
     * @param capacity
     *       ByteBuffer capacity
     * @param direct
     *       allocate DirectByteBuffer
     * @return
     *       allocated ByteBuffer
     * @throws IllegalArgumentException
     *       if capacity is negative
     */
    public static ByteBuffer allocate(int capacity, boolean direct)
            throws IllegalArgumentException {
        if (capacity < 0)
            throw new IllegalArgumentException("capacity can't be negative");
        return direct ? ByteBuffer.allocateDirect(capacity) : ByteBuffer
                .allocate(capacity);
    }
}

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