doublebuffer.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 196 行

/* DoubleBuffer.java -- 
   Copyright (C) 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package java.nio;

import gnu.java.nio.DoubleBufferImpl;

public abstract class DoubleBuffer extends Buffer implements Comparable
{
  private ByteOrder endian = ByteOrder.BIG_ENDIAN;
  protected double [] backing_buffer;

  public static DoubleBuffer allocateDirect(int capacity)
  {
    return new DoubleBufferImpl(capacity, 0, capacity);
  }

  public static DoubleBuffer allocate(int capacity)
  {
    return new DoubleBufferImpl(capacity, 0, capacity);
  }

  final public static DoubleBuffer wrap (double[] array, int offset, int length)
  {
    return new DoubleBufferImpl(array, offset, length);
  }

  final public static DoubleBuffer wrap(String a)
  {
    int len = a.length();
    double[] buffer = new double[len];

    for (int i=0;i<len;i++)
      {
        buffer[i] = (double) a.charAt(i);
      }

    return wrap(buffer, 0, len);
  }

  final public static DoubleBuffer wrap(double[] array)
  {
    return wrap(array, 0, array.length);
  }

  public DoubleBuffer get (double[] dst, int offset, int length)
  {
    for (int i = offset; i < offset + length; i++)
      {
        dst[i] = get();
      }

    return this;
  }

  public DoubleBuffer get(double[] dst)
  {
    return get(dst, 0, dst.length);
  }

  public DoubleBuffer put(DoubleBuffer src)
  {
    while (src.hasRemaining())
      put(src.get());

    return this;
  }

  public DoubleBuffer put (double[] src, int offset, int length)
  {
    for (int i = offset; i < offset + length; i++)
      put(src[i]);

    return this;
  }

  public final DoubleBuffer put(double[] src)
  {
    return put(src, 0, src.length);
  }

  public final boolean hasArray()
  {
    return (backing_buffer != null);
  }

  public final double[] array()
  {
    return backing_buffer;
  }

  public final int arrayOffset()
  {
    return 0;
  }

  public int hashCode()
  {
    return super.hashCode();
  }

  public boolean equals(Object obj)
  {
    if (obj instanceof DoubleBuffer)
      {
        return compareTo(obj) == 0;
      }

    return false;
  }

  public int compareTo(Object ob)
  {
    DoubleBuffer a = (DoubleBuffer) ob;

    if (a.remaining() != remaining())
      return 1;

    if (! hasArray() ||
        ! a.hasArray())
      {
        return 1;
      }

    int r = remaining();
    int i1 = position ();
    int i2 = a.position ();

    for (int i=0;i<r;i++)
      {
        int t = (int) (get(i1)- a.get(i2));
        if (t != 0)
          {
            return (int) t;
          }
      }

    return 0;
  }

  public ByteOrder order()
  {
    return endian;
  }

  public final DoubleBuffer order(ByteOrder bo)
  {
    endian = bo;
    return this;
  }

  public abstract double get();
  public abstract DoubleBuffer put (double b);
  public abstract double get(int index);
  public abstract DoubleBuffer put(int index, double b);
  public abstract DoubleBuffer compact();
  public abstract boolean isDirect();
  public abstract DoubleBuffer slice();
  public abstract DoubleBuffer duplicate();
  public abstract DoubleBuffer asReadOnlyBuffer();
}