1 /* FloatViewBufferImpl.java -- 2 Copyright (C) 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 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 final class FloatViewBufferImpl extends FloatBuffer 42 { 43 /** Position in bb (i.e. a byte offset) where this buffer starts. */ 44 private final int offset; 45 private final ByteBuffer bb; 46 private final boolean readOnly; 47 private final ByteOrder endian; 48 FloatViewBufferImpl(ByteBuffer bb, int capacity)49 FloatViewBufferImpl (ByteBuffer bb, int capacity) 50 { 51 super (capacity, capacity, 0, -1, bb.isDirect() ? 52 VMDirectByteBuffer.adjustAddress(bb.address, bb.position()):null, null, 0); 53 this.bb = bb; 54 this.offset = bb.position(); 55 this.readOnly = bb.isReadOnly(); 56 this.endian = bb.order(); 57 } 58 FloatViewBufferImpl(ByteBuffer bb, int offset, int capacity, int limit, int position, int mark, boolean readOnly, ByteOrder endian)59 public FloatViewBufferImpl (ByteBuffer bb, int offset, int capacity, 60 int limit, int position, int mark, 61 boolean readOnly, ByteOrder endian) 62 { 63 super (capacity, limit, position, mark, bb.isDirect() ? 64 VMDirectByteBuffer.adjustAddress(bb.address, offset):null, null, 0); 65 this.bb = bb; 66 this.offset = offset; 67 this.readOnly = readOnly; 68 this.endian = endian; 69 } 70 71 /** 72 * Reads the <code>float</code> at this buffer's current position, 73 * and then increments the position. 74 * 75 * @exception BufferUnderflowException If there are no remaining 76 * <code>floats</code> in this buffer. 77 */ get()78 public float get () 79 { 80 int p = position(); 81 float result = ByteBufferHelper.getFloat(bb, (p << 2) + offset, endian); 82 position(p + 1); 83 return result; 84 } 85 86 /** 87 * Absolute get method. Reads the <code>float</code> at position 88 * <code>index</code>. 89 * 90 * @exception IndexOutOfBoundsException If index is negative or not smaller 91 * than the buffer's limit. 92 */ get(int index)93 public float get (int index) 94 { 95 return ByteBufferHelper.getFloat(bb, (index << 2) + offset, endian); 96 } 97 put(float value)98 public FloatBuffer put (float value) 99 { 100 int p = position(); 101 ByteBufferHelper.putFloat(bb, (p << 2) + offset, value, endian); 102 position(p + 1); 103 return this; 104 } 105 put(int index, float value)106 public FloatBuffer put (int index, float value) 107 { 108 ByteBufferHelper.putFloat(bb, (index << 2) + offset, value, endian); 109 return this; 110 } 111 compact()112 public FloatBuffer compact () 113 { 114 if (position () > 0) 115 { 116 int count = limit () - position (); 117 bb.shiftDown(offset, offset + 4 * position(), 4 * count); 118 position (count); 119 limit (capacity ()); 120 } 121 else 122 { 123 position(limit()); 124 limit(capacity()); 125 } 126 return this; 127 } 128 slice()129 public FloatBuffer slice () 130 { 131 // Create a sliced copy of this object that shares its content. 132 return new FloatViewBufferImpl (bb, (position () << 2) + offset, 133 remaining(), remaining(), 0, -1, 134 readOnly, endian); 135 } 136 duplicate(boolean readOnly)137 FloatBuffer duplicate (boolean readOnly) 138 { 139 int pos = position(); 140 reset(); 141 int mark = position(); 142 position(pos); 143 return new FloatViewBufferImpl (bb, offset, capacity(), limit(), 144 pos, mark, readOnly, endian); 145 } 146 duplicate()147 public FloatBuffer duplicate () 148 { 149 return duplicate(readOnly); 150 } 151 asReadOnlyBuffer()152 public FloatBuffer asReadOnlyBuffer () 153 { 154 return duplicate(true); 155 } 156 isReadOnly()157 public boolean isReadOnly () 158 { 159 return readOnly; 160 } 161 isDirect()162 public boolean isDirect () 163 { 164 return bb.isDirect (); 165 } 166 order()167 public ByteOrder order () 168 { 169 return endian; 170 } 171 } 172