Java ByteBuffer Capacity growBuffer(ByteBuffer b, int newCapacity)

Description

Grow a byte buffer, so it has a minimal capacity or at least the double capacity of the original buffer

License

Apache License

Parameter

Parameter	Description
b	The original buffer.
newCapacity	The minimal requested new capacity.

Return

A byte buffer r with r.capacity() = max(b.capacity()*2,newCapacity) and all the data contained in b copied to the beginning of r.

Declaration

static ByteBuffer growBuffer(ByteBuffer b, int newCapacity)

Method Source Code


//package com.java2s;
//License from project: Apache License 

import java.nio.ByteBuffer;

public class Main {
    /**// w  w  w .j a v a 2 s . co  m
     * Grow a byte buffer, so it has a minimal capacity or at least
     * the double capacity of the original buffer
     *
     * @param b           The original buffer.
     * @param newCapacity The minimal requested new capacity.
     * @return A byte buffer <code>r</code> with
     * <code>r.capacity() = max(b.capacity()*2,newCapacity)</code> and
     * all the data contained in <code>b</code> copied to the beginning
     * of <code>r</code>.
     */
    static ByteBuffer growBuffer(ByteBuffer b, int newCapacity) {
        b.limit(b.position());
        b.rewind();

        int c2 = b.capacity() * 2;
        ByteBuffer on = ByteBuffer.allocate(c2 < newCapacity ? newCapacity : c2);

        on.put(b);
        return on;
    }
}