libjava/classpath/java/nio/FloatBufferImpl.java

   1 /* FloatBufferImpl.java --
   2    Copyright (C) 2002, 2003, 2004, 2005  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., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 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 FloatBufferImpl extends FloatBuffer
  45 {
  46   private final boolean readOnly;
  47
  48   FloatBufferImpl (int capacity)
  49   {
  50     this (new float [capacity], 0, capacity, capacity, 0, -1, false);
  51   }
  52
  53   FloatBufferImpl (float[] buffer, int offset, int capacity, int limit,
  54                    int position, int mark, boolean readOnly)
  55   {
  56     super (capacity, limit, position, mark, null, buffer, offset);
  57     this.readOnly = readOnly;
  58   }
  59
  60   public boolean isReadOnly ()
  61   {
  62     return readOnly;
  63   }
  64
  65   public FloatBuffer slice ()
  66   {
  67     return new FloatBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());
  68   }
  69
  70   public FloatBuffer duplicate ()
  71   {
  72     return new FloatBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());
  73   }
  74
  75   public FloatBuffer asReadOnlyBuffer ()
  76   {
  77     return new FloatBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
  78   }
  79
  80   public FloatBuffer compact ()
  81   {
  82     checkIfReadOnly();
  83     mark = -1;
  84     int p = position();
  85     int n = limit() - p;
  86     if (n > 0)
  87       {
  88         System.arraycopy(backing_buffer, array_offset + p,
  89                          backing_buffer, array_offset, n);
  90       }
  91     position(n);
  92     limit(capacity());
  93     return this;
  94   }
  95
  96   public boolean isDirect ()
  97   {
  98     return false;
  99   }
 100
 101   /**
 102    * Reads the <code>float</code> at this buffer's current position,
 103    * and then increments the position.
 104    *
 105    * @exception BufferUnderflowException If there are no remaining
 106    * <code>floats</code> in this buffer.
 107    */
 108   public float get ()
 109   {
 110     checkForUnderflow();
 111
 112     float result = backing_buffer [position ()];
 113     position (position () + 1);
 114     return result;
 115   }
 116
 117   /**
 118    * Relative put method. Writes <code>value</code> to the next position
 119    * in the buffer.
 120    *
 121    * @exception BufferOverflowException If there no remaining
 122    * space in this buffer.
 123    * @exception ReadOnlyBufferException If this buffer is read-only.
 124    */
 125   public FloatBuffer put (float value)
 126   {
 127     checkIfReadOnly();
 128     checkForOverflow();
 129
 130     backing_buffer [position ()] = value;
 131     position (position () + 1);
 132     return this;
 133   }
 134
 135   /**
 136    * Absolute get method. Reads the <code>float</code> at position
 137    * <code>index</code>.
 138    *
 139    * @exception IndexOutOfBoundsException If index is negative or not smaller
 140    * than the buffer's limit.
 141    */
 142   public float get (int index)
 143   {
 144     checkIndex(index);
 145
 146     return backing_buffer [index];
 147   }
 148
 149   /**
 150    * Absolute put method. Writes <code>value</code> to position
 151    * <code>index</code> in the buffer.
 152    *
 153    * @exception IndexOutOfBoundsException If index is negative or not smaller
 154    * than the buffer's limit.
 155    * @exception ReadOnlyBufferException If this buffer is read-only.
 156    */
 157   public FloatBuffer put (int index, float value)
 158   {
 159     checkIfReadOnly();
 160     checkIndex(index);
 161
 162     backing_buffer [index] = value;
 163     return this;
 164   }
 165
 166   public ByteOrder order ()
 167   {
 168     return ByteOrder.nativeOrder ();
 169   }
 170 }