libjava/java/nio/ShortBuffer.java

   1 /* ShortBuffer.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.ShortBufferImpl;
  41
  42 public abstract class ShortBuffer extends Buffer implements Comparable
  43 {
  44   protected short [] backing_buffer;
  45   protected int array_offset;
  46
  47   public static ShortBuffer allocateDirect(int capacity)
  48   {
  49     throw new Error ("direct buffers not implemented");
  50   }
  51
  52   public static ShortBuffer allocate(int capacity)
  53   {
  54     return new ShortBufferImpl(capacity, 0, capacity);
  55   }
  56
  57   final public static ShortBuffer wrap(short[] array, int offset, int length)
  58   {
  59     return new ShortBufferImpl(array, offset, length);
  60   }
  61
  62   final public static ShortBuffer wrap(String a)
  63   {
  64     int len = a.length();
  65     short[] buffer = new short[len];
  66
  67     for (int i=0;i<len;i++)
  68       {
  69         buffer[i] = (short) a.charAt(i);
  70       }
  71
  72     return wrap(buffer, 0, len);
  73   }
  74
  75   final public static ShortBuffer wrap(short[] array)
  76   {
  77     return wrap(array, 0, array.length);
  78   }
  79
  80   ShortBuffer (int capacity, int limit, int position, int mark)
  81   {
  82     super (capacity, limit, position, mark);
  83     array_offset = 0;
  84   }
  85
  86   public ShortBuffer get (short[] dst, int offset, int length)
  87   {
  88     for (int i = offset; i < offset + length; i++)
  89       {
  90         dst[i] = get();
  91       }
  92
  93     return this;
  94   }
  95
  96   public ShortBuffer get (short[] dst)
  97   {
  98     return get(dst, 0, dst.length);
  99   }
 100
 101   public ShortBuffer put (ShortBuffer src)
 102   {
 103     while (src.hasRemaining())
 104       put(src.get());
 105
 106     return this;
 107   }
 108
 109   public ShortBuffer put (short[] src, int offset, int length)
 110   {
 111     for (int i = offset; i < offset + length; i++)
 112       put(src[i]);
 113
 114     return this;
 115   }
 116
 117   public final ShortBuffer put(short[] src)
 118   {
 119     return put(src, 0, src.length);
 120   }
 121
 122   public final boolean hasArray()
 123   {
 124     return (backing_buffer != null
 125             && !isReadOnly ());
 126   }
 127
 128   public final short[] array()
 129   {
 130     if (backing_buffer == null)
 131       throw new UnsupportedOperationException ();
 132
 133     if (isReadOnly ())
 134       throw new ReadOnlyBufferException ();
 135
 136     return backing_buffer;
 137   }
 138
 139   public final int arrayOffset()
 140   {
 141     if (backing_buffer == null)
 142       throw new UnsupportedOperationException ();
 143
 144     if (isReadOnly ())
 145       throw new ReadOnlyBufferException ();
 146
 147     return array_offset;
 148   }
 149
 150   public int hashCode()
 151   {
 152     return super.hashCode();
 153   }
 154
 155   public boolean equals(Object obj)
 156   {
 157     if (obj instanceof ShortBuffer)
 158       {
 159         return compareTo(obj) == 0;
 160       }
 161
 162     return false;
 163   }
 164
 165   public int compareTo(Object ob)
 166   {
 167     ShortBuffer a = (ShortBuffer) ob;
 168
 169     if (a.remaining() != remaining())
 170       return 1;
 171
 172     if (! hasArray() ||
 173         ! a.hasArray())
 174       {
 175         return 1;
 176       }
 177
 178     int r = remaining();
 179     int i1 = position ();
 180     int i2 = a.position ();
 181
 182     for (int i=0;i<r;i++)
 183       {
 184         int t = (int) (get(i1)- a.get(i2));
 185
 186         if (t != 0)
 187           {
 188             return (int) t;
 189           }
 190       }
 191
 192     return 0;
 193   }
 194
 195   public abstract ByteOrder order ();
 196   public abstract short get();
 197   public abstract java.nio. ShortBuffer put(short b);
 198   public abstract short get(int index);
 199   public abstract java.nio. ShortBuffer put(int index, short b);
 200   public abstract ShortBuffer compact();
 201   public abstract boolean isDirect();
 202   public abstract ShortBuffer slice();
 203   public abstract ShortBuffer duplicate();
 204   public abstract ShortBuffer asReadOnlyBuffer();
 205 }