933522fbc3
* java/nio/ByteBuffer.java, java/nio/CharBuffer.java, java/nio/DoubleBuffer.java, java/nio/FloatBuffer.java, java/nio/IntBuffer.java, java/nio/LongBuffer.java, java/nio/ShortBuffer.java: (compareTo): Fixed bogus implementation in all buffer classes. From-SVN: r81489
362 lines
10 KiB
Java
362 lines
10 KiB
Java
/* DoubleBuffer.java --
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Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.nio;
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/**
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* @since 1.4
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*/
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public abstract class DoubleBuffer extends Buffer
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implements Comparable
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{
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int array_offset;
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double[] backing_buffer;
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DoubleBuffer (int capacity, int limit, int position, int mark)
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{
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super (capacity, limit, position, mark);
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array_offset = 0;
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}
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/**
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* Allocates a new <code>DoubleBuffer</code> object with a given capacity.
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*/
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public static DoubleBuffer allocate (int capacity)
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{
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return new DoubleBufferImpl (capacity);
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}
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/**
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* Wraps a <code>double</code> array into a <code>DoubleBuffer</code>
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* object.
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*
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold
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*/
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final public static DoubleBuffer wrap (double[] array, int offset, int length)
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{
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return new DoubleBufferImpl (array, 0, array.length, offset + length, offset, -1, false);
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}
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/**
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* Wraps a <code>double</code> array into a <code>DoubleBuffer</code>
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* object.
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*/
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final public static DoubleBuffer wrap (double[] array)
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{
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return wrap (array, 0, array.length);
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}
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/**
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* This method transfers <code>doubles<code> from this buffer into the given
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* destination array.
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*
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* @param dst The destination array
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* @param offset The offset within the array of the first <code>double</code>
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* to be written; must be non-negative and no larger than dst.length.
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* @param length The maximum number of bytes to be written to the given array;
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* must be non-negative and no larger than dst.length - offset.
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*
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* @exception BufferUnderflowException If there are fewer than length
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* <code>doubles</code> remaining in this buffer.
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold.
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*/
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public DoubleBuffer get (double[] dst, int offset, int length)
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{
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for (int i = offset; i < offset + length; i++)
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{
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dst [i] = get ();
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}
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return this;
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}
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/**
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* This method transfers <code>doubles<code> from this buffer into the given
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* destination array.
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*
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* @param dst The byte array to write into.
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*
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* @exception BufferUnderflowException If there are fewer than dst.length
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* <code>doubles</code> remaining in this buffer.
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*/
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public DoubleBuffer get (double[] dst)
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{
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return get (dst, 0, dst.length);
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}
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/**
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* Writes the content of the the <code>DoubleBUFFER</code> src
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* into the buffer.
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*
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* @param src The source data.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer for the remaining <code>doubles<code> in the source buffer.
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* @exception IllegalArgumentException If the source buffer is this buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public DoubleBuffer put (DoubleBuffer src)
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{
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if (src == this)
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throw new IllegalArgumentException ();
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if (src.remaining () > remaining ())
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throw new BufferOverflowException ();
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if (src.remaining () > 0)
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{
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double[] toPut = new double [src.remaining ()];
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src.get (toPut);
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src.put (toPut);
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}
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return this;
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}
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/**
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* Writes the content of the the <code>double array</code> src
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* into the buffer.
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*
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* @param src The array to copy into the buffer.
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* @param offset The offset within the array of the first byte to be read;
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* must be non-negative and no larger than src.length.
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* @param length The number of bytes to be read from the given array;
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* must be non-negative and no larger than src.length - offset.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer for the remaining <code>doubles<code> in the source array.
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public DoubleBuffer put (double[] src, int offset, int length)
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{
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for (int i = offset; i < offset + length; i++)
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put (src [i]);
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return this;
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}
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/**
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* Writes the content of the the <code>double array</code> src
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* into the buffer.
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*
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* @param src The array to copy into the buffer.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer for the remaining <code>doubles<code> in the source array.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public final DoubleBuffer put (double[] src)
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{
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return put (src, 0, src.length);
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}
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/**
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* Tells whether ot not this buffer is backed by an accessible
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* <code>double</code> array.
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*/
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public final boolean hasArray ()
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{
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return (backing_buffer != null
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&& !isReadOnly ());
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}
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/**
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* Returns the <code>double</code> array that backs this buffer.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only.
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* @exception UnsupportedOperationException If this buffer is not backed
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* by an accessible array.
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*/
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public final double[] array ()
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{
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if (backing_buffer == null)
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throw new UnsupportedOperationException ();
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if (isReadOnly ())
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throw new ReadOnlyBufferException ();
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return backing_buffer;
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}
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/**
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* Returns the offset within this buffer's backing array of the first element.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only.
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* @exception UnsupportedOperationException If this buffer is not backed
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* by an accessible array.
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*/
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public final int arrayOffset ()
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{
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if (backing_buffer == null)
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throw new UnsupportedOperationException ();
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if (isReadOnly ())
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throw new ReadOnlyBufferException ();
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return array_offset;
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}
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/**
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* Calculates a hash code for this buffer.
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*/
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public int hashCode ()
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{
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// FIXME: Check what SUN calculates here.
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return super.hashCode ();
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}
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/**
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* Checks if this buffer is equal to obj.
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*/
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public boolean equals (Object obj)
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{
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if (obj instanceof DoubleBuffer)
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{
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return compareTo (obj) == 0;
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}
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return false;
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}
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/**
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* Compares two <code>DoubleBuffer</code> objects.
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*
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* @exception ClassCastException If obj is not an object derived from
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* <code>DoubleBuffer</code>.
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*/
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public int compareTo (Object obj)
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{
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DoubleBuffer other = (DoubleBuffer) obj;
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int num = Math.min(remaining(), other.remaining());
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int pos_this = position();
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int pos_other = other.position();
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for (int count = 0; count < num; count++)
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{
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double a = get(pos_this++);
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double b = other.get(pos_other++);
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if (a == b)
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continue;
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if (a < b)
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return -1;
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return 1;
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}
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return remaining() - other.remaining();
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}
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/**
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* Returns the byte order of this buffer.
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*/
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public abstract ByteOrder order ();
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/**
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* Reads the <code>double</code> at this buffer's current position,
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* and then increments the position.
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*
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* @exception BufferUnderflowException If there are no remaining
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* <code>doubles</code> in this buffer.
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*/
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public abstract double get ();
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/**
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* Writes the <code>double</code> at this buffer's current position,
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* and then increments the position.
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*
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* @exception BufferOverflowException If there no remaining
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* <code>doubles</code> in this buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract DoubleBuffer put (double b);
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/**
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* Absolute get method.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit.
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*/
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public abstract double get (int index);
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/**
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* Absolute put method.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract DoubleBuffer put (int index, double b);
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/**
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* Compacts this buffer.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract DoubleBuffer compact ();
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/**
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* Tells wether or not this buffer is direct.
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*/
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public abstract boolean isDirect ();
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/**
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* Creates a new <code>DoubleBuffer</code> whose content is a shared
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* subsequence of this buffer's content.
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*/
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public abstract DoubleBuffer slice ();
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/**
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* Creates a new <code>DoubleBuffer</code> that shares this buffer's
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* content.
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*/
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public abstract DoubleBuffer duplicate ();
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/**
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* Creates a new read-only <code>DoubleBuffer</code> that shares this
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* buffer's content.
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*/
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public abstract DoubleBuffer asReadOnlyBuffer ();
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}
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