1 jls.loader.provide('jls.io.BufferChannel');
  2 
  3 jls.loader.require('jls.lang.ByteBuffer');
  4 
  5 /**
  6  * @namespace Provides for system input and output through data streams, serialization and the file system.
  7  * @name jls.io
  8  */
  9 
 10 jls.io.BufferChannel = jls.lang.Class.create({
 11     initialize : function(buffer) {
 12         if (buffer) {
 13             if (! (buffer instanceof jls.lang.ByteBuffer)) {
 14                 throw new jls.lang.Exception('Invalid Buffer argument type (' + (typeof buffer) + ')');
 15             }
 16             this._buffer = buffer.slice();
 17             this._append = false;
 18         } else {
 19             this._buffer = jls.lang.ByteBuffer.allocate(1024);
 20             // TODO Use append
 21             this._append = true;
 22         }
 23     },
 24     buffer : function() {
 25         return this._buffer;
 26     },
 27     close : function() {
 28         this._buffer.free();
 29         return this;
 30     },
 31     flush : function() {
 32         return this;
 33     },
 34     readByte : function() {
 35         if (this._buffer.remaining() < 1) {
 36             return -1;
 37         }
 38         return this._buffer.getByte();
 39     },
 40     writeByte : function(b) {
 41         if (this._buffer.remaining() < 1) {
 42             return false;
 43         }
 44         this._buffer.putByte(b);
 45         return true;
 46     },
 47     read : function(buffer) {
 48         var count = buffer.remaining();
 49 		if (count > this._buffer.remaining()) {
 50 			count = this._buffer.remaining();
 51 		}
 52         //jls.logger.trace('BufferChannel.read(' + this._buffer.remaining() + '), count: ' + count);
 53 		if (count > 0) {
 54 			buffer.putBuffer(this._buffer, count);
 55 		}
 56         return count;
 57     },
 58     write : function(buffer) {
 59         var count = this._buffer.remaining();
 60 		if (count > buffer.remaining()) {
 61 			count = buffer.remaining();
 62 		}
 63         //jls.logger.trace('BufferChannel.write(' + this._buffer.remaining() + '), count: ' + count);
 64 		if (count > 0) {
 65 			this._buffer.putBuffer(buffer, count);
 66 		}
 67         return count;
 68     },
 69     toString : function(csn) {
 70         var l = this._buffer.limit();
 71         var p = this._buffer.position();
 72         this._buffer.flip();
 73         var s = this._buffer.getString(csn);
 74         this._buffer.setLimit(l);
 75         this._buffer.setPosition(p);
 76         return s;
 77     }
 78 });
 79