1/*
2 * Copyright (c) 2000, 2012, 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 */
25package java.text;
26
27import java.util.ArrayList;
28
29/**
30 * CharacterIteratorFieldDelegate combines the notifications from a Format
31 * into a resulting <code>AttributedCharacterIterator</code>. The resulting
32 * <code>AttributedCharacterIterator</code> can be retrieved by way of
33 * the <code>getIterator</code> method.
34 *
35 */
36class CharacterIteratorFieldDelegate implements Format.FieldDelegate {
37    /**
38     * Array of AttributeStrings. Whenever <code>formatted</code> is invoked
39     * for a region > size, a new instance of AttributedString is added to
40     * attributedStrings. Subsequent invocations of <code>formatted</code>
41     * for existing regions result in invoking addAttribute on the existing
42     * AttributedStrings.
43     */
44    private ArrayList<AttributedString> attributedStrings;
45    /**
46     * Running count of the number of characters that have
47     * been encountered.
48     */
49    private int size;
50
51
52    CharacterIteratorFieldDelegate() {
53        attributedStrings = new ArrayList<>();
54    }
55
56    public void formatted(Format.Field attr, Object value, int start, int end,
57                          StringBuffer buffer) {
58        if (start != end) {
59            if (start < size) {
60                // Adjust attributes of existing runs
61                int index = size;
62                int asIndex = attributedStrings.size() - 1;
63
64                while (start < index) {
65                    AttributedString as = attributedStrings.
66                                           get(asIndex--);
67                    int newIndex = index - as.length();
68                    int aStart = Math.max(0, start - newIndex);
69
70                    as.addAttribute(attr, value, aStart, Math.min(
71                                    end - start, as.length() - aStart) +
72                                    aStart);
73                    index = newIndex;
74                }
75            }
76            if (size < start) {
77                // Pad attributes
78                attributedStrings.add(new AttributedString(
79                                          buffer.substring(size, start)));
80                size = start;
81            }
82            if (size < end) {
83                // Add new string
84                int aStart = Math.max(start, size);
85                AttributedString string = new AttributedString(
86                                   buffer.substring(aStart, end));
87
88                string.addAttribute(attr, value);
89                attributedStrings.add(string);
90                size = end;
91            }
92        }
93    }
94
95    public void formatted(int fieldID, Format.Field attr, Object value,
96                          int start, int end, StringBuffer buffer) {
97        formatted(attr, value, start, end, buffer);
98    }
99
100    /**
101     * Returns an <code>AttributedCharacterIterator</code> that can be used
102     * to iterate over the resulting formatted String.
103     *
104     * @pararm string Result of formatting.
105     */
106    public AttributedCharacterIterator getIterator(String string) {
107        // Add the last AttributedCharacterIterator if necessary
108        // assert(size <= string.length());
109        if (string.length() > size) {
110            attributedStrings.add(new AttributedString(
111                                  string.substring(size)));
112            size = string.length();
113        }
114        int iCount = attributedStrings.size();
115        AttributedCharacterIterator iterators[] = new
116                                    AttributedCharacterIterator[iCount];
117
118        for (int counter = 0; counter < iCount; counter++) {
119            iterators[counter] = attributedStrings.
120                                  get(counter).getIterator();
121        }
122        return new AttributedString(iterators).getIterator();
123    }
124}
125