Java ByteBuffer Capacity ensureCapacity(ByteBuffer buffer, int capacity)

Description

ensure Capacity

License

Open Source License

Declaration

public static ByteBuffer ensureCapacity(ByteBuffer buffer, int capacity) 

Method Source Code

//package com.java2s;
//  are made available under the terms of the Eclipse Public License v1.0

import java.nio.ByteBuffer;

import java.util.Arrays;

public class Main {
    public static ByteBuffer ensureCapacity(ByteBuffer buffer, int capacity) {
        if (buffer == null)
            return allocate(capacity);

        if (buffer.capacity() >= capacity)
            return buffer;

        if (buffer.hasArray())
            return ByteBuffer.wrap(
                    Arrays.copyOfRange(buffer.array(), buffer.arrayOffset(), buffer.arrayOffset() + capacity),
                    buffer.position(), buffer.remaining());

        throw new UnsupportedOperationException();
    }//from  w  w  w  .  j  a v  a2s.co m

    /** Allocate ByteBuffer in flush mode.
     * The position and limit will both be zero, indicating that the buffer is
     * empty and must be flipped before any data is put to it.
     * @param capacity capacity of the allocated ByteBuffer
     * @return Buffer
     */
    public static ByteBuffer allocate(int capacity) {
        ByteBuffer buf = ByteBuffer.allocate(capacity);
        buf.limit(0);
        return buf;
    }
}

Related

1. borrowByteBuffer(final int capacity)
2. ensureCapacity(ByteBuffer buff, int len)
3. ensureCapacity(ByteBuffer existingBuffer, int newLength)
4. ensureCapacity(ByteBuffer original, int newCapacity)
5. expand(ByteBuffer buffer, int newCapacity)
6. getByteBuffer(int capacity)