1/*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package java.nio;
27
28
29// ## If the sequence is a string, use reflection to share its array
30
31class StringCharBuffer                                  // package-private
32        extends CharBuffer {
33    CharSequence str;
34
35    StringCharBuffer(CharSequence s, int start, int end) { // package-private
36        super(-1, start, end, s.length());
37        int n = s.length();
38        if ((start < 0) || (start > n) || (end < start) || (end > n))
39            throw new IndexOutOfBoundsException();
40        str = s;
41    }
42
43    public CharBuffer slice() {
44        return new StringCharBuffer(str,
45                -1,
46                0,
47                this.remaining(),
48                this.remaining(),
49                offset + this.position());
50    }
51
52    private StringCharBuffer(CharSequence s,
53                             int mark,
54                             int pos,
55                             int limit,
56                             int cap,
57                             int offset) {
58        super(mark, pos, limit, cap, null, offset);
59        str = s;
60    }
61
62    public CharBuffer duplicate() {
63        return new StringCharBuffer(str, markValue(),
64                position(), limit(), capacity(), offset);
65    }
66
67    public CharBuffer asReadOnlyBuffer() {
68        return duplicate();
69    }
70
71    public final char get() {
72        return str.charAt(nextGetIndex() + offset);
73    }
74
75    public final char get(int index) {
76        return str.charAt(checkIndex(index) + offset);
77    }
78
79    char getUnchecked(int index) {
80        return str.charAt(index + offset);
81    }
82
83    // ## Override bulk get methods for better performance
84
85    public final CharBuffer put(char c) {
86        throw new ReadOnlyBufferException();
87    }
88
89    public final CharBuffer put(int index, char c) {
90        throw new ReadOnlyBufferException();
91    }
92
93    public final CharBuffer compact() {
94        throw new ReadOnlyBufferException();
95    }
96
97    public final boolean isReadOnly() {
98        return true;
99    }
100
101    final String toString(int start, int end) {
102        return str.toString().substring(start + offset, end + offset);
103    }
104
105    public final CharBuffer subSequence(int start, int end) {
106        try {
107            int pos = position();
108            return new StringCharBuffer(str,
109                    -1,
110                    pos + checkIndex(start, pos),
111                    pos + checkIndex(end, pos),
112                    capacity(),
113                    offset);
114        } catch (IllegalArgumentException x) {
115            throw new IndexOutOfBoundsException();
116        }
117    }
118
119    public boolean isDirect() {
120        return false;
121    }
122
123    public ByteOrder order() {
124        return ByteOrder.nativeOrder();
125    }
126
127}
128