Java Utililty Methods ByteBuffer Compact

ByteBuffer compact(ByteBuffer buffer)
compact

return buffer.compact();

void compact(ByteBuffer buffer)
compact

if (buffer.hasRemaining()) {
 if (buffer.position() == 0) {
 buffer.position(buffer.remaining());
 buffer.limit(buffer.capacity());
 } else
 buffer.compact();
} else
 buffer.clear();
...

boolean compact(ByteBuffer buffer)
Compact the buffer

if (buffer.position() == 0)
 return false;
boolean full = buffer.limit() == buffer.capacity();
buffer.compact().flip();
return full && buffer.limit() < buffer.capacity();

ByteBuffer[] compact(ByteBuffer[] buffers)
Compacts an array of byte buffers, retaining only the buffers that have remaining data.

for (int i = 0; i < buffers.length; i++) {
 if (buffers[i].remaining() > 0) {
 if (i == 0)
 return buffers;
 ByteBuffer[] newBuffers = new ByteBuffer[buffers.length - i];
 System.arraycopy(buffers, i, newBuffers, 0, buffers.length - i);
 return newBuffers;
return null;

byte[] toCompactArray(ByteBuffer src)
Return an appropriately sized byte array filled with the contents of src.

if (src.hasArray() && src.limit() >= src.capacity()) { 
 return src.array();
assertReadyForFreshRead(src);
byte[] dest = new byte[src.limit()];
src.get(dest); 
assert (src.position() == src.limit()); 
src.rewind(); 
...