| /* DoubleBufferImpl.java -- |
| Copyright (C) 2002, 2003, 2004, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 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; |
| |
| /** |
| * This is a Heap memory implementation |
| */ |
| final class DoubleBufferImpl extends DoubleBuffer |
| { |
| private final boolean readOnly; |
| |
| DoubleBufferImpl (int capacity) |
| { |
| this (new double [capacity], 0, capacity, capacity, 0, -1, false); |
| } |
| |
| DoubleBufferImpl (double[] buffer, int offset, int capacity, int limit, |
| int position, int mark, boolean readOnly) |
| { |
| super (capacity, limit, position, mark, null, buffer, offset); |
| this.readOnly = readOnly; |
| } |
| |
| public boolean isReadOnly () |
| { |
| return readOnly; |
| } |
| |
| public DoubleBuffer slice () |
| { |
| return new DoubleBufferImpl (backing_buffer, array_offset + position (), |
| remaining (), remaining (), 0, -1, isReadOnly ()); |
| } |
| |
| public DoubleBuffer duplicate () |
| { |
| return new DoubleBufferImpl (backing_buffer, array_offset, capacity (), |
| limit (), position (), mark, isReadOnly ()); |
| } |
| |
| public DoubleBuffer asReadOnlyBuffer () |
| { |
| return new DoubleBufferImpl (backing_buffer, array_offset, capacity (), |
| limit (), position (), mark, true); |
| } |
| |
| public DoubleBuffer compact () |
| { |
| checkIfReadOnly(); |
| mark = -1; |
| int p = position(); |
| int n = limit() - p; |
| if (n > 0) |
| { |
| System.arraycopy(backing_buffer, array_offset + p, |
| backing_buffer, array_offset, n); |
| } |
| position(n); |
| limit(capacity()); |
| return this; |
| } |
| |
| public boolean isDirect () |
| { |
| return false; |
| } |
| |
| /** |
| * Reads the <code>double</code> at this buffer's current position, |
| * and then increments the position. |
| * |
| * @exception BufferUnderflowException If there are no remaining |
| * <code>double</code>s in this buffer. |
| */ |
| public double get () |
| { |
| checkForUnderflow(); |
| |
| double result = backing_buffer [position ()]; |
| position (position () + 1); |
| return result; |
| } |
| |
| /** |
| * Relative put method. Writes <code>value</code> to the next position |
| * in the buffer. |
| * |
| * @exception BufferOverflowException If there no remaining |
| * space in this buffer. |
| * @exception ReadOnlyBufferException If this buffer is read-only. |
| */ |
| public DoubleBuffer put (double value) |
| { |
| checkIfReadOnly(); |
| checkForOverflow(); |
| |
| backing_buffer [position ()] = value; |
| position (position () + 1); |
| return this; |
| } |
| |
| /** |
| * Absolute get method. Reads the <code>double</code> at position |
| * <code>index</code>. |
| * |
| * @exception IndexOutOfBoundsException If index is negative or not smaller |
| * than the buffer's limit. |
| */ |
| public double get (int index) |
| { |
| checkIndex(index); |
| |
| return backing_buffer [index]; |
| } |
| |
| /** |
| * Absolute put method. Writes <code>value</code> to position |
| * <code>index</code> in the buffer. |
| * |
| * @exception IndexOutOfBoundsException If index is negative or not smaller |
| * than the buffer's limit. |
| * @exception ReadOnlyBufferException If this buffer is read-only. |
| */ |
| public DoubleBuffer put (int index, double value) |
| { |
| checkIfReadOnly(); |
| checkIndex(index); |
| |
| backing_buffer [index] = value; |
| return this; |
| } |
| |
| public ByteOrder order () |
| { |
| return ByteOrder.nativeOrder (); |
| } |
| } |