1 /* CharBufferImpl.java --
2 Copyright (C) 2002, 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 /**
42 * This is a Heap memory implementation
43 */
44 final class CharBufferImpl extends CharBuffer
45 {
46 private boolean readOnly;
47
48 CharBufferImpl (int capacity)
49 {
50 this (new char [capacity], 0, capacity, capacity, 0, -1, false);
51 }
52
53 CharBufferImpl (char[] 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 CharBufferImpl (CharBufferImpl copy)
62 {
63 super (copy.capacity (), copy.limit (), copy.position (), 0);
64 backing_buffer = copy.backing_buffer;
65 array_offset = copy.array_offset;
66 readOnly = copy.isReadOnly ();
67 }
68
69 public boolean isReadOnly ()
70 {
71 return readOnly;
72 }
73
74 public CharBuffer slice ()
75 {
76 return new CharBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());
77 }
78
79 public CharBuffer duplicate ()
80 {
81 return new CharBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());
82 }
83
84 public CharBuffer asReadOnlyBuffer ()
85 {
86 return new CharBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
87 }
88
89 public CharBuffer compact ()
90 {
91 checkIfReadOnly();
92 mark = -1;
93 int p = position();
94 int n = limit() - p;
95 if (n > 0)
96 {
97 System.arraycopy(backing_buffer, array_offset + p,
98 backing_buffer, array_offset, n);
99 }
100 position(n);
101 limit(capacity());
102 return this;
103 }
104
105 public boolean isDirect ()
106 {
107 return false;
108 }
109
110 public CharSequence subSequence (int start, int end)
111 {
112 if (start < 0
113 || start > length ()
114 || end < start
115 || end > length ())
116 throw new IndexOutOfBoundsException ();
117
118 return new CharBufferImpl (backing_buffer, array_offset, capacity (), position () + end, position () + start, -1, isReadOnly ());
119 }
120
121 /**
122 * Reads the <code>char</code> at this buffer's current position,
123 * and then increments the position.
124 *
125 * @exception BufferUnderflowException If there are no remaining
126 * <code>char</code>s in this buffer.
127 */
128 public char get ()
129 {
130 if (pos >= limit)
131 throw new BufferUnderflowException();
132
133 return backing_buffer [(pos++) + array_offset];
134 }
135
136 /**
137 * Relative put method. Writes <code>value</code> to the next position
138 * in the buffer.
139 *
140 * @exception ReadOnlyBufferException If this buffer is read-only.
141 */
142 public CharBuffer put (char value)
143 {
144 if (readOnly)
145 throw new ReadOnlyBufferException();
146 if (pos >= limit)
147 throw new BufferOverflowException();
148
149 backing_buffer [(pos++) + array_offset] = value;
150 return this;
151 }
152
153 /**
154 * Absolute get method. Reads the <code>char</code> at position
155 * <code>index</code>.
156 *
157 * @param index Position to read the <code>char</code> from.
158 *
159 * @exception IndexOutOfBoundsException If index is negative or not smaller
160 * than the buffer's limit.
161 */
162 public char get (int index)
163 {
164 checkIndex(index);
165
166 return backing_buffer [index + array_offset];
167 }
168
169 /**
170 * Bulk get, overloaded for speed.
171 */
172 public CharBuffer get (char[] dst, int offset, int length)
173 {
174 checkArraySize(dst.length, offset, length);
175 checkForUnderflow(length);
176
177 System.arraycopy(backing_buffer, pos + array_offset,
178 dst, offset, length);
179 pos += length;
180 return this;
181 }
182
183 /**
184 * Bulk put, overloaded for speed.
185 */
186 public CharBuffer put (char[] src, int offset, int length)
187 {
188 checkArraySize(src.length, offset, length);
189 checkForOverflow(length);
190
191 System.arraycopy(src, offset,
192 backing_buffer, pos + array_offset, length);
193 pos += length;
194 return this;
195 }
196
197 /**
198 * Absolute put method. Writes <code>value</code> to position
199 * <code>index</code> in the buffer.
200 *
201 * @exception IndexOutOfBoundsException If index is negative or not smaller
202 * than the buffer's limit.
203 * @exception ReadOnlyBufferException If this buffer is read-only.
204 */
205 public CharBuffer put (int index, char value)
206 {
207 checkIndex(index);
208 checkIfReadOnly();
209
210 backing_buffer [index + array_offset] = value;
211 return this;
212 }
213
214 public ByteOrder order ()
215 {
216 return ByteOrder.nativeOrder ();
217 }
218 }
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