Main Page | Class Hierarchy | Alphabetical List | Class List | File List | Class Members | File Members | Related Pages

ArrayAllocator.d

Go to the documentation of this file.
00001 /*******************************************************************************
00002 
00003         @file ArrayAllocator.d
00004         
00005         Copyright (C) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026 
00027                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00028 
00029 
00030         @version        Initial version, October 2004      
00031         @author         Kris
00032 
00033 
00034 *******************************************************************************/
00035 
00036 module mango.io.ArrayAllocator;
00037 
00038 private import  mango.io.Reader;
00039 
00040 private import  mango.utils.HeapSlice;
00041 
00042 private import  mango.io.model.IBuffer,
00043                 mango.io.model.IReader;
00044 
00045 /*******************************************************************************
00046 
00047 *******************************************************************************/
00048 
00049 class SimpleAllocator : IArrayAllocator
00050 {
00051         private IReader reader;
00052 
00053         /***********************************************************************
00054         
00055         ***********************************************************************/
00056 
00057         this (IReader reader)
00058         {
00059                 this.reader = reader;
00060         }
00061 
00062         /***********************************************************************
00063         
00064         ***********************************************************************/
00065 
00066         void reset ()
00067         {
00068         }
00069 
00070         /***********************************************************************
00071         
00072         ***********************************************************************/
00073 
00074         void allocate (void[]* x, BufferConverter decoder)
00075         {       
00076                 uint len = reader.length;
00077                 *x = new void [len];
00078                 printf ("allocated %d bytes\n", len);
00079                 decoder (*x, len);
00080         }
00081 }
00082 
00083 
00084 /*******************************************************************************
00085 
00086 *******************************************************************************/
00087 
00088 class BufferAllocator : IArrayAllocator
00089 {
00090         private BufferConverter raw;
00091         private uint            width;
00092         private IReader         reader;
00093 
00094         /***********************************************************************
00095         
00096         ***********************************************************************/
00097 
00098         this (IReader reader, int width = 0)
00099         {
00100                 this.width = width;
00101                 this.reader = reader;
00102                 raw = &(cast(Reader) reader).read;
00103         }
00104 
00105         /***********************************************************************
00106         
00107         ***********************************************************************/
00108 
00109         void reset ()
00110         {
00111                 IBuffer buffer = reader.getBuffer;
00112 
00113                 // ensure there's enough room for another record
00114                 if (buffer.writable < width)
00115                     buffer.compress ();
00116         }
00117 
00118         /***********************************************************************
00119         
00120         ***********************************************************************/
00121 
00122         void allocate (void[]* x, BufferConverter decoder)
00123         {       
00124                 uint len = reader.length;
00125 
00126                 if (decoder == raw)
00127                    {
00128                    *x = reader.getBuffer.get (len);
00129                    printf ("sliced %d bytes from buffer\n", len);
00130                    }
00131                 else
00132                    {
00133                    *x = new void [len];
00134                    printf ("allocated %d bytes\n", len);
00135                    decoder (*x, len);
00136                    }
00137         }
00138 }
00139 
00140 
00141 /*******************************************************************************
00142 
00143 *******************************************************************************/
00144 
00145 class SliceAllocator : HeapSlice, IArrayAllocator
00146 {
00147         private IReader reader;
00148 
00149         /***********************************************************************
00150         
00151         ***********************************************************************/
00152 
00153         this (IReader reader, int width)
00154         {
00155                 super (width);
00156                 this.reader = reader;
00157         }
00158 
00159         /***********************************************************************
00160         
00161         ***********************************************************************/
00162 
00163         void reset ()
00164         {
00165                 super.reset ();
00166         }
00167 
00168         /***********************************************************************
00169         
00170         ***********************************************************************/
00171 
00172         void allocate (void[]* x, BufferConverter decoder)
00173         {       
00174                 uint len = reader.length;
00175 
00176                 expand (len);
00177                 *x = slice (len);
00178                 printf ("sliced %d bytes from heap\n", len);
00179                 decoder (*x, len);
00180         }
00181 }
00182 
00183 

Generated on Sun Oct 24 22:31:13 2004 for Mango by doxygen 1.3.6