libjava/java/nio/DirectByteBufferImpl.java

   1 /* DirectByteBufferImpl.java --
   2    Copyright (C) 2003, 2004 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 import gnu.classpath.Configuration;
  42 import gnu.gcj.RawData;
  43
  44 class DirectByteBufferImpl extends ByteBuffer
  45 {
  46   static
  47   {
  48     // load the shared library needed for native methods.
  49     if (Configuration.INIT_LOAD_LIBRARY)
  50       {
  51         System.loadLibrary ("javanio");
  52       }
  53   }
  54
  55   RawData address;
  56   private int offset;
  57   private boolean readOnly;
  58
  59   public DirectByteBufferImpl (RawData address, long len)
  60   {
  61     this (address, 0, (int) len, (int) len, 0, -1, false);
  62   }
  63
  64   public DirectByteBufferImpl (RawData address, int offset, int capacity,
  65                                int limit, int position, int mark,
  66                                boolean readOnly)
  67   {
  68     super (capacity, limit, position, mark);
  69     this.address = address;
  70     this.offset = offset;
  71     this.readOnly = readOnly;
  72   }
  73
  74   private static native RawData allocateImpl (int capacity);
  75   private static native void freeImpl (RawData address);
  76
  77   protected void finalize () throws Throwable
  78   {
  79     freeImpl (address);
  80   }
  81
  82   public static ByteBuffer allocateDirect (int capacity)
  83   {
  84     RawData address = allocateImpl (capacity);
  85
  86     if (address == null)
  87       throw new InternalError ("Not enough memory to create direct buffer");
  88
  89     return new DirectByteBufferImpl (address, 0, capacity, capacity, 0, -1, false);
  90   }
  91
  92   private native byte getImpl (int index);
  93   private native void putImpl (int index, byte value);
  94
  95   public byte get ()
  96   {
  97     byte result = getImpl (position () + offset);
  98     position (position () + 1);
  99     return result;
 100   }
 101
 102   public byte get (int index)
 103   {
 104     return getImpl (index);
 105   }
 106
 107   public ByteBuffer put (byte value)
 108   {
 109     putImpl (position (), value);
 110     position (position () + 1);
 111     return this;
 112   }
 113
 114   public ByteBuffer put (int index, byte value)
 115   {
 116     putImpl (index, value);
 117     return this;
 118   }
 119
 120   native void shiftDown (int dst_offset, int src_offset, int count);
 121
 122   public ByteBuffer compact ()
 123   {
 124     int pos = position();
 125     if (pos > 0)
 126       {
 127         int count = remaining();
 128         shiftDown(0, pos, count);
 129         position(count);
 130         limit(capacity());
 131       }
 132     return this;
 133   }
 134
 135   public ByteBuffer duplicate ()
 136   {
 137     return new DirectByteBufferImpl (
 138       address, offset, capacity (), limit (), position (), -1, isReadOnly ());
 139   }
 140
 141   public ByteBuffer slice ()
 142   {
 143     return new DirectByteBufferImpl (address, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 144   }
 145
 146   public ByteBuffer asReadOnlyBuffer ()
 147   {
 148     return new DirectByteBufferImpl (
 149       address, offset, capacity (), limit (), position (), -1, true);
 150   }
 151
 152   public boolean isReadOnly ()
 153   {
 154     return readOnly;
 155   }
 156
 157   public boolean isDirect ()
 158   {
 159     return true;
 160   }
 161
 162   public CharBuffer asCharBuffer ()
 163   {
 164     return new CharViewBufferImpl (this, position (), remaining (), remaining (), 0, -1, isReadOnly (), order());
 165   }
 166
 167   public DoubleBuffer asDoubleBuffer ()
 168   {
 169     return new DoubleViewBufferImpl (this, position (), remaining (), remaining (), 0, -1, isReadOnly (), order());
 170   }
 171
 172   public FloatBuffer asFloatBuffer ()
 173   {
 174     return new FloatViewBufferImpl (this, position (), remaining (), remaining (), 0, -1, isReadOnly (), order());
 175   }
 176
 177   public IntBuffer asIntBuffer ()
 178   {
 179     return new IntViewBufferImpl (this, position (), remaining (), remaining (), 0, -1, isReadOnly (), order());
 180   }
 181
 182   public LongBuffer asLongBuffer ()
 183   {
 184     return new LongViewBufferImpl (this, position (), remaining (), remaining (), 0, -1, isReadOnly (), order());
 185   }
 186
 187   public ShortBuffer asShortBuffer ()
 188   {
 189     return new ShortViewBufferImpl (this, position (), remaining (), remaining (), 0, -1, isReadOnly (), order());
 190   }
 191
 192   final public char getChar ()
 193   {
 194     return ByteBufferHelper.getChar(this, order());
 195   }
 196
 197   final public ByteBuffer putChar (char value)
 198   {
 199     ByteBufferHelper.putChar(this, value, order());
 200     return this;
 201   }
 202
 203   final public char getChar (int index)
 204   {
 205     return ByteBufferHelper.getChar(this, index, order());
 206   }
 207
 208   final public ByteBuffer putChar (int index, char value)
 209   {
 210     ByteBufferHelper.putChar(this, index, value, order());
 211     return this;
 212   }
 213
 214   final public short getShort ()
 215   {
 216     return ByteBufferHelper.getShort(this, order());
 217   }
 218
 219   final public ByteBuffer putShort (short value)
 220   {
 221     ByteBufferHelper.putShort(this, value, order());
 222     return this;
 223   }
 224
 225   final public short getShort (int index)
 226   {
 227     return ByteBufferHelper.getShort(this, index, order());
 228   }
 229
 230   final public ByteBuffer putShort (int index, short value)
 231   {
 232     ByteBufferHelper.putShort(this, index, value, order());
 233     return this;
 234   }
 235
 236   final public int getInt ()
 237   {
 238     return ByteBufferHelper.getInt(this, order());
 239   }
 240
 241   final public ByteBuffer putInt (int value)
 242   {
 243     ByteBufferHelper.putInt(this, value, order());
 244     return this;
 245   }
 246
 247   final public int getInt (int index)
 248   {
 249     return ByteBufferHelper.getInt(this, index, order());
 250   }
 251
 252   final public ByteBuffer putInt (int index, int value)
 253   {
 254     ByteBufferHelper.putInt(this, index, value, order());
 255     return this;
 256   }
 257
 258   final public long getLong ()
 259   {
 260     return ByteBufferHelper.getLong(this, order());
 261   }
 262
 263   final public ByteBuffer putLong (long value)
 264   {
 265     ByteBufferHelper.putLong (this, value, order());
 266     return this;
 267   }
 268
 269   final public long getLong (int index)
 270   {
 271     return ByteBufferHelper.getLong (this, index, order());
 272   }
 273
 274   final public ByteBuffer putLong (int index, long value)
 275   {
 276     ByteBufferHelper.putLong (this, index, value, order());
 277     return this;
 278   }
 279
 280   final public float getFloat ()
 281   {
 282     return ByteBufferHelper.getFloat (this, order());
 283   }
 284
 285   final public ByteBuffer putFloat (float value)
 286   {
 287     ByteBufferHelper.putFloat (this, value, order());
 288     return this;
 289   }
 290
 291   public final float getFloat (int index)
 292   {
 293     return ByteBufferHelper.getFloat (this, index, order());
 294   }
 295
 296   final public ByteBuffer putFloat (int index, float value)
 297   {
 298     ByteBufferHelper.putFloat (this, index, value, order());
 299     return this;
 300   }
 301
 302   final public double getDouble ()
 303   {
 304     return ByteBufferHelper.getDouble (this, order());
 305   }
 306
 307   final public ByteBuffer putDouble (double value)
 308   {
 309     ByteBufferHelper.putDouble (this, value, order());
 310     return this;
 311   }
 312
 313   final public double getDouble (int index)
 314   {
 315     return ByteBufferHelper.getDouble (this, index, order());
 316   }
 317
 318   final public ByteBuffer putDouble (int index, double value)
 319   {
 320     ByteBufferHelper.putDouble (this, index, value, order());
 321     return this;
 322   }
 323 }