libjava/java/nio/IntBufferImpl.java

   1 /* IntBufferImpl.java --
   2    Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.nio;
  40
  41 /**
  42  * This is a Heap memory implementation
  43  */
  44 final class IntBufferImpl extends IntBuffer
  45 {
  46   private boolean readOnly;
  47
  48   IntBufferImpl (int capacity)
  49   {
  50     this (new int [capacity], 0, capacity, capacity, 0, -1, false);
  51   }
  52
  53   IntBufferImpl (int[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)
  54   {
  55     super (capacity, limit, position, mark);
  56     this.backing_buffer = buffer;
  57     this.array_offset = offset;
  58     this.readOnly = readOnly;
  59   }
  60
  61   public boolean isReadOnly ()
  62   {
  63     return readOnly;
  64   }
  65
  66   public IntBuffer slice ()
  67   {
  68     return new IntBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());
  69   }
  70
  71   public IntBuffer duplicate ()
  72   {
  73     return new IntBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());
  74   }
  75
  76   public IntBuffer asReadOnlyBuffer ()
  77   {
  78     return new IntBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
  79   }
  80
  81   public IntBuffer compact ()
  82   {
  83     int copied = 0;
  84
  85     while (remaining () > 0)
  86       {
  87         put (copied, get ());
  88         copied++;
  89       }
  90
  91     position (copied);
  92     return this;
  93   }
  94
  95   public boolean isDirect ()
  96   {
  97     return false;
  98   }
  99
 100   /**
 101    * Relative get method. Reads the next <code>int</code> from the buffer.
 102    */
 103   public int get ()
 104   {
 105     int result = backing_buffer [position ()];
 106     position (position () + 1);
 107     return result;
 108   }
 109
 110   /**
 111    * Relative put method. Writes <code>value</code> to the next position
 112    * in the buffer.
 113    *
 114    * @exception ReadOnlyBufferException If this buffer is read-only.
 115    */
 116   public IntBuffer put (int value)
 117   {
 118     if (readOnly)
 119       throw new ReadOnlyBufferException ();
 120
 121     backing_buffer [position ()] = value;
 122     position (position () + 1);
 123     return this;
 124   }
 125
 126   /**
 127    * Absolute get method. Reads the <code>int</code> at position
 128    * <code>index</code>.
 129    *
 130    * @exception IndexOutOfBoundsException If index is negative or not smaller
 131    * than the buffer's limit.
 132    */
 133   public int get (int index)
 134   {
 135     return backing_buffer [index];
 136   }
 137
 138   /**
 139    * Absolute put method. Writes <code>value</value> to position
 140    * <code>index</code> in the buffer.
 141    *
 142    * @exception IndexOutOfBoundsException If index is negative or not smaller
 143    * than the buffer's limit.
 144    * @exception ReadOnlyBufferException If this buffer is read-only.
 145    */
 146   public IntBuffer put (int index, int value)
 147   {
 148     if (readOnly)
 149       throw new ReadOnlyBufferException ();
 150
 151     backing_buffer [index] = value;
 152     return this;
 153   }
 154
 155   public ByteOrder order ()
 156   {
 157     return ByteOrder.nativeOrder ();
 158   }
 159 }