1/*
2 * Copyright (c) 2005, 2015, 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
26/*
27 *******************************************************************************
28 * Copyright (C) 1996-2009, International Business Machines Corporation and    *
29 * others. All Rights Reserved.                                                *
30 *******************************************************************************
31 */
32
33package sun.text.normalizer;
34
35/**
36 * <code>ReplaceableString</code> is an adapter class that implements the
37 * <code>Replaceable</code> API around an ordinary <code>StringBuffer</code>.
38 *
39 * <p><em>Note:</em> This class does not support attributes and is not
40 * intended for general use.  Most clients will need to implement
41 * {@link Replaceable} in their text representation class.
42 *
43 * <p>Copyright &copy; IBM Corporation 1999.  All rights reserved.
44 *
45 * @see Replaceable
46 * @author Alan Liu
47 * @stable ICU 2.0
48 */
49class ReplaceableString implements Replaceable {
50
51    private StringBuffer buf;
52
53    /**
54     * Construct a new object with the given initial contents.
55     * @param str initial contents
56     * @stable ICU 2.0
57     */
58    public ReplaceableString(String str) {
59        buf = new StringBuffer(str);
60    }
61
62    /**
63     * Construct a new object using <code>buf</code> for internal
64     * storage.  The contents of <code>buf</code> at the time of
65     * construction are used as the initial contents.  <em>Note!
66     * Modifications to <code>buf</code> will modify this object, and
67     * vice versa.</em>
68     * @param buf object to be used as internal storage
69     * @stable ICU 2.0
70     */
71    public ReplaceableString(StringBuffer buf) {
72        this.buf = buf;
73    }
74
75    /**
76     * Return the number of characters contained in this object.
77     * <code>Replaceable</code> API.
78     * @stable ICU 2.0
79     */
80    public int length() {
81        return buf.length();
82    }
83
84    /**
85     * Return the character at the given position in this object.
86     * <code>Replaceable</code> API.
87     * @param offset offset into the contents, from 0 to
88     * <code>length()</code> - 1
89     * @stable ICU 2.0
90     */
91    public char charAt(int offset) {
92        return buf.charAt(offset);
93    }
94
95    /**
96     * Copies characters from this object into the destination
97     * character array.  The first character to be copied is at index
98     * <code>srcStart</code>; the last character to be copied is at
99     * index <code>srcLimit-1</code> (thus the total number of
100     * characters to be copied is <code>srcLimit-srcStart</code>). The
101     * characters are copied into the subarray of <code>dst</code>
102     * starting at index <code>dstStart</code> and ending at index
103     * <code>dstStart + (srcLimit-srcStart) - 1</code>.
104     *
105     * @param srcStart the beginning index to copy, inclusive;
106     *        {@code 0 <= start <= limit}.
107     * @param srcLimit the ending index to copy, exclusive;
108     *        {@code start <= limit <= length()}.
109     * @param dst the destination array.
110     * @param dstStart the start offset in the destination array.
111     * @stable ICU 2.0
112     */
113    public void getChars(int srcStart, int srcLimit, char dst[], int dstStart) {
114        if (srcStart != srcLimit) {
115            buf.getChars(srcStart, srcLimit, dst, dstStart);
116        }
117    }
118}
119