1 /* DoubleBufferImpl.java -- 2 Copyright (C) 2002, 2003 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 39 package java.nio; 40 41 /** 42 * This is a Heap memory implementation 43 */ 44 final class DoubleBufferImpl extends DoubleBuffer 45 { 46 private boolean readOnly; 47 DoubleBufferImpl(int capacity)48 DoubleBufferImpl (int capacity) 49 { 50 this (new double [capacity], 0, capacity, capacity, 0, -1, false); 51 } 52 DoubleBufferImpl(double[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)53 DoubleBufferImpl (double[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly) 54 { 55 super (buffer, offset, capacity, limit, position, mark); 56 this.readOnly = readOnly; 57 } 58 isReadOnly()59 public boolean isReadOnly () 60 { 61 return readOnly; 62 } 63 slice()64 public DoubleBuffer slice () 65 { 66 return new DoubleBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ()); 67 } 68 duplicate()69 public DoubleBuffer duplicate () 70 { 71 return new DoubleBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ()); 72 } 73 asReadOnlyBuffer()74 public DoubleBuffer asReadOnlyBuffer () 75 { 76 return new DoubleBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true); 77 } 78 compact()79 public DoubleBuffer compact () 80 { 81 int copied = 0; 82 83 while (remaining () > 0) 84 { 85 put (copied, get ()); 86 copied++; 87 } 88 89 position (copied); 90 return this; 91 } 92 isDirect()93 public boolean isDirect () 94 { 95 return false; 96 } 97 98 /** 99 * Relative get method. Reads the next <code>double</code> from the buffer. 100 */ get()101 final public double get () 102 { 103 double result = backing_buffer [position ()]; 104 position (position () + 1); 105 return result; 106 } 107 108 /** 109 * Relative put method. Writes <code>value</code> to the next position 110 * in the buffer. 111 * 112 * @exception ReadOnlyBufferException If this buffer is read-only. 113 */ put(double value)114 final public DoubleBuffer put (double value) 115 { 116 if (readOnly) 117 throw new ReadOnlyBufferException (); 118 119 backing_buffer [position ()] = value; 120 position (position () + 1); 121 return this; 122 } 123 124 /** 125 * Absolute get method. Reads the <code>double</code> at position 126 * <code>index</code>. 127 * 128 * @exception IndexOutOfBoundsException If index is negative or not smaller 129 * than the buffer's limit. 130 */ get(int index)131 final public double get (int index) 132 { 133 return backing_buffer [index]; 134 } 135 136 /** 137 * Absolute put method. Writes <code>value</value> to position 138 * <code>index</code> in the buffer. 139 * 140 * @exception IndexOutOfBoundsException If index is negative or not smaller 141 * than the buffer's limit. 142 * @exception ReadOnlyBufferException If this buffer is read-only. 143 */ put(int index, double value)144 final public DoubleBuffer put (int index, double value) 145 { 146 if (readOnly) 147 throw new ReadOnlyBufferException (); 148 149 backing_buffer [index] = value; 150 return this; 151 } 152 order()153 final public ByteOrder order () 154 { 155 return ByteOrder.nativeOrder (); 156 } 157 } 158