Examples of java.nio.ByteBuffer

java.nio.ByteBuffer
A buffer of bytes.
A byte buffer can be created in either of the following ways:
- {@link #allocate(int) Allocate} a new byte array and create a bufferbased on it;
- {@link #allocateDirect(int) Allocate} a memory block and create a directbuffer based on it;
- {@link #wrap(byte[]) Wrap} an existing byte array to create a newbuffer.

    }else{
      int  rem = max_bytes;
      
      byte[]  bytes = new byte[1];
      
      ByteBuffer    bb  = ByteBuffer.wrap( bytes );
      
      ByteBuffer[]  bbs = { bb };
      
      while( rem > 0 && !( paused || paused_internally )){
        
        if ( transport.read( bbs,0, 1 ) == 0 ){
          
          break;
        }
        
        rem--;
        
        protocol_bytes_read++;
        
        bb.flip();
        
        char  c = (char)(bytes[0]&0xff);
        
        header_so_far.append( c );

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    this.width = width;
    this.height = height;
  }
  
  public byte[] getContentPayload() {
    ByteBuffer buffer = ByteBuffer.allocate(13);
    
    //width : 4 bytes
    buffer.putInt(width);
    
    //height : 4 bytes
    buffer.putInt(height);
    
    //color depth : 1 byte
    buffer.put((byte)8);
    
    //color type : 1 byte
    buffer.put((byte)0);
    
    //compression method : 1 byte
    buffer.put((byte)0);
    
    //filter method : 1 byte
    buffer.put((byte)0);
    
    //interlace method : 1 byte
    buffer.put((byte)0);
    
    return buffer.array();
    
  }

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    if (filter == null) {
      return (this.global < length ? OK : NOT_OK);
    }


    ByteBuffer buffer = null;


    long nextPosition = this.global;


    do {

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    final long p = this.getPosition(); // remember current position


    // 1st aquire the buffers for both records
    this.setPosition(r1);
    final ByteBuffer b1 = BufferUtils.slice(this.next()); // Remember the buffer


    this.setPosition(r2);
    final ByteBuffer b2 = BufferUtils.slice(this.next()); // Remember the buffer


    // Replace r2 first, as its replacement won't affect position of r1
    this.setPosition(r2);
    this.replace(b1);


    // Lastly replace r1, it might affect r2 position, but r2 has already been
    // replaced, so no big deal
    this.setPosition(r1);
    this.replace(b2);


    /*
     * Try to get back to roughly the same position, the position might only
     * change if r1 < position < r2 and if r1.length != r2.length, otherwise the
     * position should still end up on same record's start position
     */
    this.seek(p);


    this.autoflush.autoflushChange(b1.capacity() + b2.capacity());
  }

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      return ByteBuffer.allocate(bufferSize);
  } 


  //Uninitialize an instance to be returned to the pool. 
    public void passivateObject(Object obj) {
    ByteBuffer ch = (ByteBuffer)obj;
    ch.clear();
    }

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      dst.position(saved_position);
    }
  }


  private static ByteBuffer doNoCopyWrap(ByteBuffer buffer) {
    ByteBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

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  private static ByteBuffer lookupBuffer(ByteBuffer buffer) {
    return getCachedBuffers(buffer.remaining()).byte_buffer;
  }


  private static ByteBuffer doWrap(ByteBuffer buffer) {
    ByteBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

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  }


  public int getInfoInt(final T object, final int param_name) {
    object.checkValid();


    final ByteBuffer buffer = APIUtil.getBufferByte(4);
    getInfo(object, param_name, buffer, null);


    return buffer.getInt(0);
  }

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  }


  public long getInfoLong(final T object, final int param_name) {
    object.checkValid();


    final ByteBuffer buffer = APIUtil.getBufferByte(8);
    getInfo(object, param_name, buffer, null);


    return buffer.getLong(0);
  }

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    final int bytes = getSizeRet(object, param_name);
    if ( bytes <= 1 )
      return null;


    final ByteBuffer buffer = APIUtil.getBufferByte(bytes);
    getInfo(object, param_name, buffer, null);


    buffer.limit(bytes - 1); // Exclude null-termination
    return APIUtil.getString(buffer);
  }

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