1 /* IntBufferImpl.java --
2 Copyright (C) 2002, 2003, 2004, 2005 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 /**
42 * This is a Heap memory implementation
43 */
44 final class IntBufferImpl extends IntBuffer
45 {
46 private boolean readOnly;
47
48 IntBufferImpl (int capacity)
49 {
50 this (new int [capacity], 0, capacity, capacity, 0, -1, false);
51 }
52
53 IntBufferImpl (int[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)
54 {
55 super (capacity, limit, position, mark);
56 this.backing_buffer = buffer;
57 this.array_offset = offset;
58 this.readOnly = readOnly;
59 }
60
61 public boolean isReadOnly ()
62 {
63 return readOnly;
64 }
65
66 public IntBuffer slice ()
67 {
68 return new IntBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());
69 }
70
71 public IntBuffer duplicate ()
72 {
73 return new IntBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());
74 }
75
76 public IntBuffer asReadOnlyBuffer ()
77 {
78 return new IntBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
79 }
80
81 public IntBuffer compact ()
82 {
83 checkIfReadOnly();
84 mark = -1;
85 int p = position();
86 int n = limit() - p;
87 if (n > 0)
88 {
89 System.arraycopy(backing_buffer, array_offset + p,
90 backing_buffer, array_offset, n);
91 }
92 position(n);
93 limit(capacity());
94 return this;
95 }
96
97 public boolean isDirect ()
98 {
99 return false;
100 }
101
102 /**
103 * Reads the <code>int</code> at this buffer's current position,
104 * and then increments the position.
105 *
106 * @exception BufferUnderflowException If there are no remaining
107 * <code>ints</code> in this buffer.
108 */
109 public int get ()
110 {
111 checkForUnderflow();
112
113 int result = backing_buffer [position ()];
114 position (position () + 1);
115 return result;
116 }
117
118 /**
119 * Relative put method. Writes <code>value</code> to the next position
120 * in the buffer.
121 *
122 * @exception BufferOverflowException If there no remaining
123 * space in this buffer.
124 * @exception ReadOnlyBufferException If this buffer is read-only.
125 */
126 public IntBuffer put (int value)
127 {
128 checkIfReadOnly();
129 checkForOverflow();
130
131 backing_buffer [position ()] = value;
132 position (position () + 1);
133 return this;
134 }
135
136 /**
137 * Absolute get method. Reads the <code>int</code> at position
138 * <code>index</code>.
139 *
140 * @exception IndexOutOfBoundsException If index is negative or not smaller
141 * than the buffer's limit.
142 */
143 public int get (int index)
144 {
145 checkIndex(index);
146
147 return backing_buffer [index];
148 }
149
150 /**
151 * Absolute put method. Writes <code>value</code> to position
152 * <code>index</code> in the buffer.
153 *
154 * @exception IndexOutOfBoundsException If index is negative or not smaller
155 * than the buffer's limit.
156 * @exception ReadOnlyBufferException If this buffer is read-only.
157 */
158 public IntBuffer put (int index, int value)
159 {
160 checkIfReadOnly();
161 checkIndex(index);
162
163 backing_buffer [index] = value;
164 return this;
165 }
166
167 public ByteOrder order ()
168 {
169 return ByteOrder.nativeOrder ();
170 }
171 }
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