libjava/java/nio/DoubleBuffer.java

   1 /* DoubleBuffer.java --
   2    Copyright (C) 2002 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 package java.nio;
  39
  40 import gnu.java.nio.DoubleBufferImpl;
  41
  42 public abstract class DoubleBuffer extends Buffer implements Comparable
  43 {
  44   protected double [] backing_buffer;
  45   protected int array_offset;
  46
  47   public static DoubleBuffer allocateDirect(int capacity)
  48   {
  49     throw new Error ("direct buffers are not implemented");
  50   }
  51
  52   public static DoubleBuffer allocate(int capacity)
  53   {
  54     return new DoubleBufferImpl(capacity, 0, capacity);
  55   }
  56
  57   final public static DoubleBuffer wrap (double[] array, int offset, int length)
  58   {
  59     return new DoubleBufferImpl(array, offset, length);
  60   }
  61
  62   final public static DoubleBuffer wrap(String a)
  63   {
  64     int len = a.length();
  65     double[] buffer = new double[len];
  66
  67     for (int i=0;i<len;i++)
  68       {
  69         buffer[i] = (double) a.charAt(i);
  70       }
  71
  72     return wrap(buffer, 0, len);
  73   }
  74
  75   final public static DoubleBuffer wrap(double[] array)
  76   {
  77     return wrap(array, 0, array.length);
  78   }
  79
  80   DoubleBuffer (int capacity, int limit, int position, int mark)
  81   {
  82     super (capacity, limit, position, mark);
  83   }
  84
  85   public DoubleBuffer get (double[] dst, int offset, int length)
  86   {
  87     for (int i = offset; i < offset + length; i++)
  88       {
  89         dst[i] = get();
  90       }
  91
  92     return this;
  93   }
  94
  95   public DoubleBuffer get (double[] dst)
  96   {
  97     return get(dst, 0, dst.length);
  98   }
  99
 100   public DoubleBuffer put (DoubleBuffer src)
 101   {
 102     while (src.hasRemaining())
 103       put(src.get());
 104
 105     return this;
 106   }
 107
 108   public DoubleBuffer put (double[] src, int offset, int length)
 109   {
 110     for (int i = offset; i < offset + length; i++)
 111       put(src[i]);
 112
 113     return this;
 114   }
 115
 116   public final DoubleBuffer put(double[] src)
 117   {
 118     return put(src, 0, src.length);
 119   }
 120
 121   public final boolean hasArray()
 122   {
 123     return (backing_buffer != null
 124             && !isReadOnly ());
 125   }
 126
 127   public final double[] array()
 128   {
 129     if (backing_buffer == null)
 130       throw new UnsupportedOperationException ();
 131
 132     if (isReadOnly ())
 133       throw new ReadOnlyBufferException ();
 134
 135     return backing_buffer;
 136   }
 137
 138   public final int arrayOffset()
 139   {
 140     if (backing_buffer == null)
 141       throw new UnsupportedOperationException ();
 142
 143     if (isReadOnly ())
 144       throw new ReadOnlyBufferException ();
 145
 146     return array_offset;
 147   }
 148
 149   public int hashCode()
 150   {
 151     return super.hashCode();
 152   }
 153
 154   public boolean equals(Object obj)
 155   {
 156     if (obj instanceof DoubleBuffer)
 157       {
 158         return compareTo(obj) == 0;
 159       }
 160
 161     return false;
 162   }
 163
 164   public int compareTo(Object ob)
 165   {
 166     DoubleBuffer a = (DoubleBuffer) ob;
 167
 168     if (a.remaining() != remaining())
 169       return 1;
 170
 171     if (! hasArray() ||
 172         ! a.hasArray())
 173       {
 174         return 1;
 175       }
 176
 177     int r = remaining();
 178     int i1 = position ();
 179     int i2 = a.position ();
 180
 181     for (int i=0;i<r;i++)
 182       {
 183         int t = (int) (get(i1)- a.get(i2));
 184         if (t != 0)
 185           {
 186             return (int) t;
 187           }
 188       }
 189
 190     return 0;
 191   }
 192
 193   public abstract ByteOrder order ();
 194   public abstract double get();
 195   public abstract DoubleBuffer put (double b);
 196   public abstract double get(int index);
 197   public abstract DoubleBuffer put(int index, double b);
 198   public abstract DoubleBuffer compact();
 199   public abstract boolean isDirect();
 200   public abstract DoubleBuffer slice();
 201   public abstract DoubleBuffer duplicate();
 202   public abstract DoubleBuffer asReadOnlyBuffer();
 203 }