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  What about ByteBuffer.get(ByteBuffer)  (Read 1646 times)
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Offline Riven
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Hand over your head.


« Posted 2007-08-28 08:21:53 »

I'm slightly puzzled why we have so much put/get methods in ByteBuffer, yet ByteBuffer.get(ByteBuffer) is missing.

(And slightly puzzled why I only ran into this after so many years...)

We have:
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ByteBuffer.put(byte[])
ByteBuffer.put(byte[], off, len)
ByteBuffer.put(ByteBuffer)
ByteBuffer.get(byte[])
ByteBuffer.get(byte[], off, len)
----- where is ByteBuffer.get(ByteBuffer)




Here's my own workaround:
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   public static void put(ByteBuffer dst, ByteBuffer src)
   {
      dst.put(src); // oh the simplicity!
   }

   public static void get(ByteBuffer dst, ByteBuffer src)
   {
      if(src.remaining() == dst.remaining())
      {
         dst.put(src);
         return;
      }

      if (src.remaining() < dst.remaining())
         throw new BufferUnderflowException();


      // what this effectivly does:
      //
      // while (dst.hasRemaining()) // dst, not src - like BB.put(BB)
      //    dst.put(src.get());

      int pos = src.position();
      int lim = src.limit();
      int rem = dst.remaining();

      // reduce the visible bytes, to the range we are about to copy
      src.limit(pos + rem);

      // copy bytes
      dst.put(src);

      // restore the visible bytes
      src.limit(lim);
   }



So what on earth am I missing, or... why is that method missing? Smiley

 Huh

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Offline broumbroum

Junior Devvie





« Reply #1 - Posted 2007-08-28 16:42:09 »

http://java.sun.com/j2se/1.4.2/docs/api/java/nio/ByteBuffer.html#get(byte[],%20int,%20int)

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Offline Riven
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Medals: 832
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Hand over your head.


« Reply #2 - Posted 2007-08-28 16:56:28 »

Yeah... I already said that in my post... Roll Eyes

ByteBuffer.get(byte[]) != ByteBuffer.get(ByteBuffer)

..

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Offline swpalmer

JGO Coder


Exp: 12 years


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« Reply #3 - Posted 2007-09-03 15:13:29 »

I suppose ByteBuffer.slice was supposed to be good enough?

Offline Riven
« League of Dukes »

« JGO Overlord »


Medals: 832
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #4 - Posted 2007-09-04 14:59:34 »

I suppose ByteBuffer.slice was supposed to be good enough?

Don't get me started about object creation in tight loops...

Appearantly slice() wasn't good enough to get rid of get(byte[]), it simply looks like they forgot it. ?


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