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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
4    * distributed with this work for additional information        *
5    * regarding copyright ownership.  The ASF licenses this file   *
6    * to you under the Apache License, Version 2.0 (the            *
7    * "License"); you may not use this file except in compliance   *
8    * with the License.  You may obtain a copy of the License at   *
9    *                                                              *
10   *   http://www.apache.org/licenses/LICENSE-2.0                 *
11   *                                                              *
12   * Unless required by applicable law or agreed to in writing,   *
13   * software distributed under the License is distributed on an  *
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15   * KIND, either express or implied.  See the License for the    *
16   * specific language governing permissions and limitations      *
17   * under the License.                                           *
18   */
19  package org.apache.rat.report.xml.writer;
20  
21  import java.io.IOException;
22  import java.io.Writer;
23  import java.util.ArrayDeque;
24  import java.util.Arrays;
25  import java.util.HashSet;
26  import java.util.Objects;
27  import java.util.Set;
28  
29  /**
30   * <p>
31   * Lightweight {@link IXmlWriter} implementation.
32   * </p>
33   * <p>
34   * Requires a wrapper to be used safely in a multithreaded environment.
35   * </p>
36   * <p>
37   * Not intended to be subclassed. Please copy and hack!
38   * </p>
39   */
40  @SuppressWarnings({"checkstyle:MagicNumber", "checkstyle:JavadocVariable"})
41  public final class XmlWriter implements IXmlWriter {
42  
43      private static final byte NAME_START_MASK = 1 << 1;
44      private static final byte NAME_MASK = 1 << 2;
45      private static final byte NAME_BODY_CHAR = NAME_MASK;
46      private static final byte NAME_START_OR_BODY_CHAR = NAME_MASK | NAME_START_MASK;
47  
48      private static final boolean[] ALLOWED_CHARACTERS = new boolean[1 << 16];
49  
50      static {
51          Arrays.fill(ALLOWED_CHARACTERS, false);
52          ALLOWED_CHARACTERS[0x9] = true;
53          ALLOWED_CHARACTERS[0xA] = true;
54          ALLOWED_CHARACTERS[0xD] = true;
55          Arrays.fill(ALLOWED_CHARACTERS, 0x20, 0xD7FF, true);
56          Arrays.fill(ALLOWED_CHARACTERS, 0xE000, 0xFFFD, true);
57      }
58  
59      private static final byte[] CHARACTER_CODES = new byte[1 << 16];
60  
61      static {
62          // Name ::= (Letter | '_' | ':') (NameChar)*
63          CHARACTER_CODES['_'] = NAME_START_OR_BODY_CHAR;
64          CHARACTER_CODES[':'] = NAME_START_OR_BODY_CHAR;
65          // Letter ::= BaseChar | Ideographic
66          // BaseChar
67          Arrays.fill(CHARACTER_CODES, 0x0041, 0x005A, NAME_START_OR_BODY_CHAR);
68          Arrays.fill(CHARACTER_CODES, 0x0061, 0x007A, NAME_START_OR_BODY_CHAR);
69          Arrays.fill(CHARACTER_CODES, 0x00C0, 0x00D6, NAME_START_OR_BODY_CHAR);
70          Arrays.fill(CHARACTER_CODES, 0x00D8, 0x00F6, NAME_START_OR_BODY_CHAR);
71          Arrays.fill(CHARACTER_CODES, 0x00F8, 0x00FF, NAME_START_OR_BODY_CHAR);
72          Arrays.fill(CHARACTER_CODES, 0x0100, 0x0131, NAME_START_OR_BODY_CHAR);
73          Arrays.fill(CHARACTER_CODES, 0x0134, 0x013E, NAME_START_OR_BODY_CHAR);
74          Arrays.fill(CHARACTER_CODES, 0x0141, 0x0148, NAME_START_OR_BODY_CHAR);
75          Arrays.fill(CHARACTER_CODES, 0x014A, 0x017E, NAME_START_OR_BODY_CHAR);
76          Arrays.fill(CHARACTER_CODES, 0x0180, 0x01C3, NAME_START_OR_BODY_CHAR);
77          Arrays.fill(CHARACTER_CODES, 0x01CD, 0x01F0, NAME_START_OR_BODY_CHAR);
78          Arrays.fill(CHARACTER_CODES, 0x01F4, 0x01F5, NAME_START_OR_BODY_CHAR);
79          Arrays.fill(CHARACTER_CODES, 0x01FA, 0x0217, NAME_START_OR_BODY_CHAR);
80          Arrays.fill(CHARACTER_CODES, 0x0250, 0x02A8, NAME_START_OR_BODY_CHAR);
81          Arrays.fill(CHARACTER_CODES, 0x02BB, 0x02C1, NAME_START_OR_BODY_CHAR);
82          CHARACTER_CODES[0x0386] = NAME_START_OR_BODY_CHAR;
83          Arrays.fill(CHARACTER_CODES, 0x0388, 0x038A, NAME_START_OR_BODY_CHAR);
84          CHARACTER_CODES[0x038C] = NAME_START_OR_BODY_CHAR;
85          Arrays.fill(CHARACTER_CODES, 0x038E, 0x03A1, NAME_START_OR_BODY_CHAR);
86          Arrays.fill(CHARACTER_CODES, 0x03A3, 0x03CE, NAME_START_OR_BODY_CHAR);
87          Arrays.fill(CHARACTER_CODES, 0x03D0, 0x03D6, NAME_START_OR_BODY_CHAR);
88          CHARACTER_CODES[0x03DA] = NAME_START_OR_BODY_CHAR;
89          CHARACTER_CODES[0x03DC] = NAME_START_OR_BODY_CHAR;
90          CHARACTER_CODES[0x03DE] = NAME_START_OR_BODY_CHAR;
91          CHARACTER_CODES[0x03E0] = NAME_START_OR_BODY_CHAR;
92          Arrays.fill(CHARACTER_CODES, 0x03E2, 0x03F3, NAME_START_OR_BODY_CHAR);
93          Arrays.fill(CHARACTER_CODES, 0x0401, 0x040C, NAME_START_OR_BODY_CHAR);
94          Arrays.fill(CHARACTER_CODES, 0x040E, 0x044F, NAME_START_OR_BODY_CHAR);
95          Arrays.fill(CHARACTER_CODES, 0x0451, 0x045C, NAME_START_OR_BODY_CHAR);
96          Arrays.fill(CHARACTER_CODES, 0x045E, 0x0481, NAME_START_OR_BODY_CHAR);
97          Arrays.fill(CHARACTER_CODES, 0x0490, 0x04C4, NAME_START_OR_BODY_CHAR);
98          Arrays.fill(CHARACTER_CODES, 0x04C7, 0x04C8, NAME_START_OR_BODY_CHAR);
99          Arrays.fill(CHARACTER_CODES, 0x04CB, 0x04CC, NAME_START_OR_BODY_CHAR);
100         Arrays.fill(CHARACTER_CODES, 0x04D0, 0x04EB, NAME_START_OR_BODY_CHAR);
101         Arrays.fill(CHARACTER_CODES, 0x04EE, 0x04F5, NAME_START_OR_BODY_CHAR);
102         Arrays.fill(CHARACTER_CODES, 0x04F8, 0x04F9, NAME_START_OR_BODY_CHAR);
103         Arrays.fill(CHARACTER_CODES, 0x0531, 0x0556, NAME_START_OR_BODY_CHAR);
104         CHARACTER_CODES[0x0559] = NAME_START_OR_BODY_CHAR;
105         Arrays.fill(CHARACTER_CODES, 0x0561, 0x0586, NAME_START_OR_BODY_CHAR);
106         Arrays.fill(CHARACTER_CODES, 0x05D0, 0x05EA, NAME_START_OR_BODY_CHAR);
107         Arrays.fill(CHARACTER_CODES, 0x05F0, 0x05F2, NAME_START_OR_BODY_CHAR);
108         Arrays.fill(CHARACTER_CODES, 0x0621, 0x063A, NAME_START_OR_BODY_CHAR);
109         Arrays.fill(CHARACTER_CODES, 0x0641, 0x064A, NAME_START_OR_BODY_CHAR);
110         Arrays.fill(CHARACTER_CODES, 0x0671, 0x06B7, NAME_START_OR_BODY_CHAR);
111         Arrays.fill(CHARACTER_CODES, 0x06BA, 0x06BE, NAME_START_OR_BODY_CHAR);
112         Arrays.fill(CHARACTER_CODES, 0x06C0, 0x06CE, NAME_START_OR_BODY_CHAR);
113         Arrays.fill(CHARACTER_CODES, 0x06D0, 0x06D3, NAME_START_OR_BODY_CHAR);
114         CHARACTER_CODES[0x06D5] = NAME_START_OR_BODY_CHAR;
115         Arrays.fill(CHARACTER_CODES, 0x06E5, 0x06E6, NAME_START_OR_BODY_CHAR);
116         Arrays.fill(CHARACTER_CODES, 0x0905, 0x0939, NAME_START_OR_BODY_CHAR);
117         CHARACTER_CODES[0x093D] = NAME_START_OR_BODY_CHAR;
118         Arrays.fill(CHARACTER_CODES, 0x0958, 0x0961, NAME_START_OR_BODY_CHAR);
119         Arrays.fill(CHARACTER_CODES, 0x0985, 0x098C, NAME_START_OR_BODY_CHAR);
120         Arrays.fill(CHARACTER_CODES, 0x098F, 0x0990, NAME_START_OR_BODY_CHAR);
121         Arrays.fill(CHARACTER_CODES, 0x0993, 0x09A8, NAME_START_OR_BODY_CHAR);
122         Arrays.fill(CHARACTER_CODES, 0x09AA, 0x09B0, NAME_START_OR_BODY_CHAR);
123         CHARACTER_CODES[0x09B2] = NAME_START_OR_BODY_CHAR;
124         Arrays.fill(CHARACTER_CODES, 0x09B6, 0x09B9, NAME_START_OR_BODY_CHAR);
125         Arrays.fill(CHARACTER_CODES, 0x09DC, 0x09DD, NAME_START_OR_BODY_CHAR);
126         Arrays.fill(CHARACTER_CODES, 0x09DF, 0x09E1, NAME_START_OR_BODY_CHAR);
127         Arrays.fill(CHARACTER_CODES, 0x09F0, 0x09F1, NAME_START_OR_BODY_CHAR);
128         Arrays.fill(CHARACTER_CODES, 0x0A05, 0x0A0A, NAME_START_OR_BODY_CHAR);
129         Arrays.fill(CHARACTER_CODES, 0x0A0F, 0x0A10, NAME_START_OR_BODY_CHAR);
130         Arrays.fill(CHARACTER_CODES, 0x0A13, 0x0A28, NAME_START_OR_BODY_CHAR);
131         Arrays.fill(CHARACTER_CODES, 0x0A2A, 0x0A30, NAME_START_OR_BODY_CHAR);
132         Arrays.fill(CHARACTER_CODES, 0x0A32, 0x0A33, NAME_START_OR_BODY_CHAR);
133         Arrays.fill(CHARACTER_CODES, 0x0A35, 0x0A36, NAME_START_OR_BODY_CHAR);
134         Arrays.fill(CHARACTER_CODES, 0x0A38, 0x0A39, NAME_START_OR_BODY_CHAR);
135         Arrays.fill(CHARACTER_CODES, 0x0A59, 0x0A5C, NAME_START_OR_BODY_CHAR);
136         CHARACTER_CODES[0x0A5E] = NAME_START_OR_BODY_CHAR;
137         Arrays.fill(CHARACTER_CODES, 0x0A72, 0x0A74, NAME_START_OR_BODY_CHAR);
138         Arrays.fill(CHARACTER_CODES, 0x0A85, 0x0A8B, NAME_START_OR_BODY_CHAR);
139         CHARACTER_CODES[0x0A8D] = NAME_START_OR_BODY_CHAR;
140         Arrays.fill(CHARACTER_CODES, 0x0A8F, 0x0A91, NAME_START_OR_BODY_CHAR);
141         Arrays.fill(CHARACTER_CODES, 0x0A93, 0x0AA8, NAME_START_OR_BODY_CHAR);
142         Arrays.fill(CHARACTER_CODES, 0x0AAA, 0x0AB0, NAME_START_OR_BODY_CHAR);
143         Arrays.fill(CHARACTER_CODES, 0x0AB2, 0x0AB3, NAME_START_OR_BODY_CHAR);
144         Arrays.fill(CHARACTER_CODES, 0x0AB5, 0x0AB9, NAME_START_OR_BODY_CHAR);
145         CHARACTER_CODES[0x0ABD] = NAME_START_OR_BODY_CHAR;
146         CHARACTER_CODES[0x0AE0] = NAME_START_OR_BODY_CHAR;
147         Arrays.fill(CHARACTER_CODES, 0x0B05, 0x0B0C, NAME_START_OR_BODY_CHAR);
148         Arrays.fill(CHARACTER_CODES, 0x0B0F, 0x0B10, NAME_START_OR_BODY_CHAR);
149         Arrays.fill(CHARACTER_CODES, 0x0B13, 0x0B28, NAME_START_OR_BODY_CHAR);
150         Arrays.fill(CHARACTER_CODES, 0x0B2A, 0x0B30, NAME_START_OR_BODY_CHAR);
151         Arrays.fill(CHARACTER_CODES, 0x0B32, 0x0B33, NAME_START_OR_BODY_CHAR);
152         Arrays.fill(CHARACTER_CODES, 0x0B36, 0x0B39, NAME_START_OR_BODY_CHAR);
153         CHARACTER_CODES[0x0B3D] = NAME_START_OR_BODY_CHAR;
154         Arrays.fill(CHARACTER_CODES, 0x0B5C, 0x0B5D, NAME_START_OR_BODY_CHAR);
155         Arrays.fill(CHARACTER_CODES, 0x0B5F, 0x0B61, NAME_START_OR_BODY_CHAR);
156         Arrays.fill(CHARACTER_CODES, 0x0B85, 0x0B8A, NAME_START_OR_BODY_CHAR);
157         Arrays.fill(CHARACTER_CODES, 0x0B8E, 0x0B90, NAME_START_OR_BODY_CHAR);
158         Arrays.fill(CHARACTER_CODES, 0x0B92, 0x0B95, NAME_START_OR_BODY_CHAR);
159         Arrays.fill(CHARACTER_CODES, 0x0B99, 0x0B9A, NAME_START_OR_BODY_CHAR);
160         CHARACTER_CODES[0x0B9C] = NAME_START_OR_BODY_CHAR;
161         Arrays.fill(CHARACTER_CODES, 0x0B9E, 0x0B9F, NAME_START_OR_BODY_CHAR);
162         Arrays.fill(CHARACTER_CODES, 0x0BA3, 0x0BA4, NAME_START_OR_BODY_CHAR);
163         Arrays.fill(CHARACTER_CODES, 0x0BA8, 0x0BAA, NAME_START_OR_BODY_CHAR);
164         Arrays.fill(CHARACTER_CODES, 0x0BAE, 0x0BB5, NAME_START_OR_BODY_CHAR);
165         Arrays.fill(CHARACTER_CODES, 0x0BB7, 0x0BB9, NAME_START_OR_BODY_CHAR);
166         Arrays.fill(CHARACTER_CODES, 0x0C05, 0x0C0C, NAME_START_OR_BODY_CHAR);
167         Arrays.fill(CHARACTER_CODES, 0x0C0E, 0x0C10, NAME_START_OR_BODY_CHAR);
168         Arrays.fill(CHARACTER_CODES, 0x0C12, 0x0C28, NAME_START_OR_BODY_CHAR);
169         Arrays.fill(CHARACTER_CODES, 0x0C2A, 0x0C33, NAME_START_OR_BODY_CHAR);
170         Arrays.fill(CHARACTER_CODES, 0x0C35, 0x0C39, NAME_START_OR_BODY_CHAR);
171         Arrays.fill(CHARACTER_CODES, 0x0C60, 0x0C61, NAME_START_OR_BODY_CHAR);
172         Arrays.fill(CHARACTER_CODES, 0x0C85, 0x0C8C, NAME_START_OR_BODY_CHAR);
173         Arrays.fill(CHARACTER_CODES, 0x0C8E, 0x0C90, NAME_START_OR_BODY_CHAR);
174         Arrays.fill(CHARACTER_CODES, 0x0C92, 0x0CA8, NAME_START_OR_BODY_CHAR);
175         Arrays.fill(CHARACTER_CODES, 0x0CAA, 0x0CB3, NAME_START_OR_BODY_CHAR);
176         Arrays.fill(CHARACTER_CODES, 0x0CB5, 0x0CB9, NAME_START_OR_BODY_CHAR);
177         CHARACTER_CODES[0x0CDE] = NAME_START_OR_BODY_CHAR;
178         Arrays.fill(CHARACTER_CODES, 0x0CE0, 0x0CE1, NAME_START_OR_BODY_CHAR);
179         Arrays.fill(CHARACTER_CODES, 0x0D05, 0x0D0C, NAME_START_OR_BODY_CHAR);
180         Arrays.fill(CHARACTER_CODES, 0x0D0E, 0x0D10, NAME_START_OR_BODY_CHAR);
181         Arrays.fill(CHARACTER_CODES, 0x0D12, 0x0D28, NAME_START_OR_BODY_CHAR);
182         Arrays.fill(CHARACTER_CODES, 0x0D2A, 0x0D39, NAME_START_OR_BODY_CHAR);
183         Arrays.fill(CHARACTER_CODES, 0x0D60, 0x0D61, NAME_START_OR_BODY_CHAR);
184         Arrays.fill(CHARACTER_CODES, 0x0E01, 0x0E2E, NAME_START_OR_BODY_CHAR);
185         CHARACTER_CODES[0x0E30] = NAME_START_OR_BODY_CHAR;
186         Arrays.fill(CHARACTER_CODES, 0x0E32, 0x0E33, NAME_START_OR_BODY_CHAR);
187         Arrays.fill(CHARACTER_CODES, 0x0E40, 0x0E45, NAME_START_OR_BODY_CHAR);
188         Arrays.fill(CHARACTER_CODES, 0x0E81, 0x0E82, NAME_START_OR_BODY_CHAR);
189         CHARACTER_CODES[0x0E84] = NAME_START_OR_BODY_CHAR;
190         Arrays.fill(CHARACTER_CODES, 0x0E87, 0x0E88, NAME_START_OR_BODY_CHAR);
191         CHARACTER_CODES[0x0E8A] = NAME_START_OR_BODY_CHAR;
192         CHARACTER_CODES[0x0E8D] = NAME_START_OR_BODY_CHAR;
193         Arrays.fill(CHARACTER_CODES, 0x0E94, 0x0E97, NAME_START_OR_BODY_CHAR);
194         Arrays.fill(CHARACTER_CODES, 0x0E99, 0x0E9F, NAME_START_OR_BODY_CHAR);
195         Arrays.fill(CHARACTER_CODES, 0x0EA1, 0x0EA3, NAME_START_OR_BODY_CHAR);
196         CHARACTER_CODES[0x0EA5] = NAME_START_OR_BODY_CHAR;
197         CHARACTER_CODES[0x0EA7] = NAME_START_OR_BODY_CHAR;
198         Arrays.fill(CHARACTER_CODES, 0x0EAA, 0x0EAB, NAME_START_OR_BODY_CHAR);
199         Arrays.fill(CHARACTER_CODES, 0x0EAD, 0x0EAE, NAME_START_OR_BODY_CHAR);
200         CHARACTER_CODES[0x0EB0] = NAME_START_OR_BODY_CHAR;
201         Arrays.fill(CHARACTER_CODES, 0x0EB2, 0x0EB3, NAME_START_OR_BODY_CHAR);
202         CHARACTER_CODES[0x0EBD] = NAME_START_OR_BODY_CHAR;
203         Arrays.fill(CHARACTER_CODES, 0x0EC0, 0x0EC4, NAME_START_OR_BODY_CHAR);
204         Arrays.fill(CHARACTER_CODES, 0x0F40, 0x0F47, NAME_START_OR_BODY_CHAR);
205         Arrays.fill(CHARACTER_CODES, 0x0F49, 0x0F69, NAME_START_OR_BODY_CHAR);
206         Arrays.fill(CHARACTER_CODES, 0x10A0, 0x10C5, NAME_START_OR_BODY_CHAR);
207         Arrays.fill(CHARACTER_CODES, 0x10D0, 0x10F6, NAME_START_OR_BODY_CHAR);
208         CHARACTER_CODES[0x1100] = NAME_START_OR_BODY_CHAR;
209         Arrays.fill(CHARACTER_CODES, 0x1102, 0x1103, NAME_START_OR_BODY_CHAR);
210         Arrays.fill(CHARACTER_CODES, 0x1105, 0x1107, NAME_START_OR_BODY_CHAR);
211         CHARACTER_CODES[0x1109] = NAME_START_OR_BODY_CHAR;
212         Arrays.fill(CHARACTER_CODES, 0x110B, 0x110C, NAME_START_OR_BODY_CHAR);
213         Arrays.fill(CHARACTER_CODES, 0x110E, 0x1112, NAME_START_OR_BODY_CHAR);
214         CHARACTER_CODES[0x113C] = NAME_START_OR_BODY_CHAR;
215         CHARACTER_CODES[0x113E] = NAME_START_OR_BODY_CHAR;
216         CHARACTER_CODES[0x1140] = NAME_START_OR_BODY_CHAR;
217         CHARACTER_CODES[0x114C] = NAME_START_OR_BODY_CHAR;
218         CHARACTER_CODES[0x114E] = NAME_START_OR_BODY_CHAR;
219         CHARACTER_CODES[0x1150] = NAME_START_OR_BODY_CHAR;
220         Arrays.fill(CHARACTER_CODES, 0x1154, 0x1155, NAME_START_OR_BODY_CHAR);
221         CHARACTER_CODES[0x1159] = NAME_START_OR_BODY_CHAR;
222         Arrays.fill(CHARACTER_CODES, 0x115F, 0x1161, NAME_START_OR_BODY_CHAR);
223         CHARACTER_CODES[0x1163] = NAME_START_OR_BODY_CHAR;
224         CHARACTER_CODES[0x1165] = NAME_START_OR_BODY_CHAR;
225         CHARACTER_CODES[0x1167] = NAME_START_OR_BODY_CHAR;
226         CHARACTER_CODES[0x1169] = NAME_START_OR_BODY_CHAR;
227         Arrays.fill(CHARACTER_CODES, 0x116D, 0x116E, NAME_START_OR_BODY_CHAR);
228         Arrays.fill(CHARACTER_CODES, 0x1172, 0x1173, NAME_START_OR_BODY_CHAR);
229         CHARACTER_CODES[0x1175] = NAME_START_OR_BODY_CHAR;
230         CHARACTER_CODES[0x119E] = NAME_START_OR_BODY_CHAR;
231         CHARACTER_CODES[0x11A8] = NAME_START_OR_BODY_CHAR;
232         CHARACTER_CODES[0x11AB] = NAME_START_OR_BODY_CHAR;
233         Arrays.fill(CHARACTER_CODES, 0x11AE, 0x11AF, NAME_START_OR_BODY_CHAR);
234         Arrays.fill(CHARACTER_CODES, 0x11B7, 0x11B8, NAME_START_OR_BODY_CHAR);
235         CHARACTER_CODES[0x11BA] = NAME_START_OR_BODY_CHAR;
236         Arrays.fill(CHARACTER_CODES, 0x11BC, 0x11C2, NAME_START_OR_BODY_CHAR);
237         CHARACTER_CODES[0x11EB] = NAME_START_OR_BODY_CHAR;
238         CHARACTER_CODES[0x11F0] = NAME_START_OR_BODY_CHAR;
239         CHARACTER_CODES[0x11F9] = NAME_START_OR_BODY_CHAR;
240         Arrays.fill(CHARACTER_CODES, 0x1E00, 0x1E9B, NAME_START_OR_BODY_CHAR);
241         Arrays.fill(CHARACTER_CODES, 0x1EA0, 0x1EF9, NAME_START_OR_BODY_CHAR);
242         Arrays.fill(CHARACTER_CODES, 0x1F00, 0x1F15, NAME_START_OR_BODY_CHAR);
243         Arrays.fill(CHARACTER_CODES, 0x1F18, 0x1F1D, NAME_START_OR_BODY_CHAR);
244         Arrays.fill(CHARACTER_CODES, 0x1F20, 0x1F45, NAME_START_OR_BODY_CHAR);
245         Arrays.fill(CHARACTER_CODES, 0x1F48, 0x1F4D, NAME_START_OR_BODY_CHAR);
246         Arrays.fill(CHARACTER_CODES, 0x1F50, 0x1F57, NAME_START_OR_BODY_CHAR);
247         CHARACTER_CODES[0x1F59] = NAME_START_OR_BODY_CHAR;
248         CHARACTER_CODES[0x1F5B] = NAME_START_OR_BODY_CHAR;
249         CHARACTER_CODES[0x1F5D] = NAME_START_OR_BODY_CHAR;
250         Arrays.fill(CHARACTER_CODES, 0x1F5F, 0x1F7D, NAME_START_OR_BODY_CHAR);
251         Arrays.fill(CHARACTER_CODES, 0x1F80, 0x1FB4, NAME_START_OR_BODY_CHAR);
252         Arrays.fill(CHARACTER_CODES, 0x1FB6, 0x1FBC, NAME_START_OR_BODY_CHAR);
253         CHARACTER_CODES[0x1FBE] = NAME_START_OR_BODY_CHAR;
254         Arrays.fill(CHARACTER_CODES, 0x1FC2, 0x1FC4, NAME_START_OR_BODY_CHAR);
255         Arrays.fill(CHARACTER_CODES, 0x1FC6, 0x1FCC, NAME_START_OR_BODY_CHAR);
256         Arrays.fill(CHARACTER_CODES, 0x1FD0, 0x1FD3, NAME_START_OR_BODY_CHAR);
257         Arrays.fill(CHARACTER_CODES, 0x1FD6, 0x1FDB, NAME_START_OR_BODY_CHAR);
258         Arrays.fill(CHARACTER_CODES, 0x1FE0, 0x1FEC, NAME_START_OR_BODY_CHAR);
259         Arrays.fill(CHARACTER_CODES, 0x1FF2, 0x1FF4, NAME_START_OR_BODY_CHAR);
260         Arrays.fill(CHARACTER_CODES, 0x1FF6, 0x1FFC, NAME_START_OR_BODY_CHAR);
261         CHARACTER_CODES[0x2126] = NAME_START_OR_BODY_CHAR;
262         Arrays.fill(CHARACTER_CODES, 0x212A, 0x212B, NAME_START_OR_BODY_CHAR);
263         CHARACTER_CODES[0x212E] = NAME_START_OR_BODY_CHAR;
264         Arrays.fill(CHARACTER_CODES, 0x2180, 0x2182, NAME_START_OR_BODY_CHAR);
265         Arrays.fill(CHARACTER_CODES, 0x3041, 0x3094, NAME_START_OR_BODY_CHAR);
266         Arrays.fill(CHARACTER_CODES, 0x30A1, 0x30FA, NAME_START_OR_BODY_CHAR);
267         Arrays.fill(CHARACTER_CODES, 0x3105, 0x312C, NAME_START_OR_BODY_CHAR);
268         Arrays.fill(CHARACTER_CODES, 0xAC00, 0xD7A3, NAME_START_OR_BODY_CHAR);
269         // Ideographic
270         Arrays.fill(CHARACTER_CODES, 0x4E00, 0x9FA5, NAME_START_OR_BODY_CHAR);
271         CHARACTER_CODES[0x3007] = NAME_START_OR_BODY_CHAR;
272         Arrays.fill(CHARACTER_CODES, 0x3021, 0x3029, NAME_START_OR_BODY_CHAR);
273         // NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar |
274         // Extender
275         CHARACTER_CODES['.'] = NAME_BODY_CHAR;
276         CHARACTER_CODES['-'] = NAME_BODY_CHAR;
277         // CombiningChar
278         Arrays.fill(CHARACTER_CODES, 0x0300, 0x0345, NAME_BODY_CHAR);
279         Arrays.fill(CHARACTER_CODES, 0x0360, 0x0361, NAME_BODY_CHAR);
280         Arrays.fill(CHARACTER_CODES, 0x0483, 0x0486, NAME_BODY_CHAR);
281         Arrays.fill(CHARACTER_CODES, 0x0591, 0x05A1, NAME_BODY_CHAR);
282         Arrays.fill(CHARACTER_CODES, 0x05A3, 0x05B9, NAME_BODY_CHAR);
283         Arrays.fill(CHARACTER_CODES, 0x05BB, 0x05BD, NAME_BODY_CHAR);
284         CHARACTER_CODES[0x05BF] = NAME_BODY_CHAR;
285         Arrays.fill(CHARACTER_CODES, 0x05C1, 0x05C2, NAME_BODY_CHAR);
286         CHARACTER_CODES[0x05C4] = NAME_BODY_CHAR;
287         Arrays.fill(CHARACTER_CODES, 0x064B, 0x0652, NAME_BODY_CHAR);
288         CHARACTER_CODES[0x0670] = NAME_BODY_CHAR;
289         Arrays.fill(CHARACTER_CODES, 0x06D6, 0x06DC, NAME_BODY_CHAR);
290         Arrays.fill(CHARACTER_CODES, 0x06DD, 0x06DF, NAME_BODY_CHAR);
291         Arrays.fill(CHARACTER_CODES, 0x06E0, 0x06E4, NAME_BODY_CHAR);
292         Arrays.fill(CHARACTER_CODES, 0x06E7, 0x06E8, NAME_BODY_CHAR);
293         Arrays.fill(CHARACTER_CODES, 0x06EA, 0x06ED, NAME_BODY_CHAR);
294         Arrays.fill(CHARACTER_CODES, 0x0901, 0x0903, NAME_BODY_CHAR);
295         CHARACTER_CODES[0x093C] = NAME_BODY_CHAR;
296         Arrays.fill(CHARACTER_CODES, 0x093E, 0x094C, NAME_BODY_CHAR);
297         CHARACTER_CODES[0x094D] = NAME_BODY_CHAR;
298         Arrays.fill(CHARACTER_CODES, 0x0951, 0x0954, NAME_BODY_CHAR);
299         Arrays.fill(CHARACTER_CODES, 0x0962, 0x0963, NAME_BODY_CHAR);
300         Arrays.fill(CHARACTER_CODES, 0x0981, 0x0983, NAME_BODY_CHAR);
301         CHARACTER_CODES[0x09BC] = NAME_BODY_CHAR;
302         CHARACTER_CODES[0x09BE] = NAME_BODY_CHAR;
303         CHARACTER_CODES[0x09BF] = NAME_BODY_CHAR;
304         Arrays.fill(CHARACTER_CODES, 0x09C0, 0x09C4, NAME_BODY_CHAR);
305         Arrays.fill(CHARACTER_CODES, 0x09C7, 0x09C8, NAME_BODY_CHAR);
306         Arrays.fill(CHARACTER_CODES, 0x09CB, 0x09CD, NAME_BODY_CHAR);
307         CHARACTER_CODES[0x09D7] = NAME_BODY_CHAR;
308         Arrays.fill(CHARACTER_CODES, 0x09E2, 0x09E3, NAME_BODY_CHAR);
309         CHARACTER_CODES[0x0A02] = NAME_BODY_CHAR;
310         CHARACTER_CODES[0x0A3C] = NAME_BODY_CHAR;
311         CHARACTER_CODES[0x0A3E] = NAME_BODY_CHAR;
312         CHARACTER_CODES[0x0A3F] = NAME_BODY_CHAR;
313         Arrays.fill(CHARACTER_CODES, 0x0A40, 0x0A42, NAME_BODY_CHAR);
314         Arrays.fill(CHARACTER_CODES, 0x0A47, 0x0A48, NAME_BODY_CHAR);
315         Arrays.fill(CHARACTER_CODES, 0x0A4B, 0x0A4D, NAME_BODY_CHAR);
316         Arrays.fill(CHARACTER_CODES, 0x0A70, 0x0A71, NAME_BODY_CHAR);
317         Arrays.fill(CHARACTER_CODES, 0x0A81, 0x0A83, NAME_BODY_CHAR);
318         CHARACTER_CODES[0x0ABC] = NAME_BODY_CHAR;
319         Arrays.fill(CHARACTER_CODES, 0x0ABE, 0x0AC5, NAME_BODY_CHAR);
320         Arrays.fill(CHARACTER_CODES, 0x0AC7, 0x0AC9, NAME_BODY_CHAR);
321         Arrays.fill(CHARACTER_CODES, 0x0ACB, 0x0ACD, NAME_BODY_CHAR);
322         Arrays.fill(CHARACTER_CODES, 0x0B01, 0x0B03, NAME_BODY_CHAR);
323         CHARACTER_CODES[0x0B3C] = NAME_BODY_CHAR;
324         Arrays.fill(CHARACTER_CODES, 0x0B3E, 0x0B43, NAME_BODY_CHAR);
325         Arrays.fill(CHARACTER_CODES, 0x0B47, 0x0B48, NAME_BODY_CHAR);
326         Arrays.fill(CHARACTER_CODES, 0x0B4B, 0x0B4D, NAME_BODY_CHAR);
327         Arrays.fill(CHARACTER_CODES, 0x0B56, 0x0B57, NAME_BODY_CHAR);
328         Arrays.fill(CHARACTER_CODES, 0x0B82, 0x0B83, NAME_BODY_CHAR);
329         Arrays.fill(CHARACTER_CODES, 0x0BBE, 0x0BC2, NAME_BODY_CHAR);
330         Arrays.fill(CHARACTER_CODES, 0x0BC6, 0x0BC8, NAME_BODY_CHAR);
331         Arrays.fill(CHARACTER_CODES, 0x0BCA, 0x0BCD, NAME_BODY_CHAR);
332         CHARACTER_CODES[0x0BD7] = NAME_BODY_CHAR;
333         Arrays.fill(CHARACTER_CODES, 0x0C01, 0x0C03, NAME_BODY_CHAR);
334         Arrays.fill(CHARACTER_CODES, 0x0C3E, 0x0C44, NAME_BODY_CHAR);
335         Arrays.fill(CHARACTER_CODES, 0x0C46, 0x0C48, NAME_BODY_CHAR);
336         Arrays.fill(CHARACTER_CODES, 0x0C4A, 0x0C4D, NAME_BODY_CHAR);
337         Arrays.fill(CHARACTER_CODES, 0x0C55, 0x0C56, NAME_BODY_CHAR);
338         Arrays.fill(CHARACTER_CODES, 0x0C82, 0x0C83, NAME_BODY_CHAR);
339         Arrays.fill(CHARACTER_CODES, 0x0CBE, 0x0CC4, NAME_BODY_CHAR);
340         Arrays.fill(CHARACTER_CODES, 0x0CC6, 0x0CC8, NAME_BODY_CHAR);
341         Arrays.fill(CHARACTER_CODES, 0x0CCA, 0x0CCD, NAME_BODY_CHAR);
342         Arrays.fill(CHARACTER_CODES, 0x0CD5, 0x0CD6, NAME_BODY_CHAR);
343         Arrays.fill(CHARACTER_CODES, 0x0D02, 0x0D03, NAME_BODY_CHAR);
344         Arrays.fill(CHARACTER_CODES, 0x0D3E, 0x0D43, NAME_BODY_CHAR);
345         Arrays.fill(CHARACTER_CODES, 0x0D46, 0x0D48, NAME_BODY_CHAR);
346         Arrays.fill(CHARACTER_CODES, 0x0D4A, 0x0D4D, NAME_BODY_CHAR);
347         CHARACTER_CODES[0x0D57] = NAME_BODY_CHAR;
348         CHARACTER_CODES[0x0E31] = NAME_BODY_CHAR;
349         Arrays.fill(CHARACTER_CODES, 0x0E34, 0x0E3A, NAME_BODY_CHAR);
350         Arrays.fill(CHARACTER_CODES, 0x0E47, 0x0E4E, NAME_BODY_CHAR);
351         CHARACTER_CODES[0x0EB1] = NAME_BODY_CHAR;
352         Arrays.fill(CHARACTER_CODES, 0x0EB4, 0x0EB9, NAME_BODY_CHAR);
353         Arrays.fill(CHARACTER_CODES, 0x0EBB, 0x0EBC, NAME_BODY_CHAR);
354         Arrays.fill(CHARACTER_CODES, 0x0EC8, 0x0ECD, NAME_BODY_CHAR);
355         Arrays.fill(CHARACTER_CODES, 0x0F18, 0x0F19, NAME_BODY_CHAR);
356         CHARACTER_CODES[0x0F35] = NAME_BODY_CHAR;
357         CHARACTER_CODES[0x0F37] = NAME_BODY_CHAR;
358         CHARACTER_CODES[0x0F39] = NAME_BODY_CHAR;
359         CHARACTER_CODES[0x0F3E] = NAME_BODY_CHAR;
360         CHARACTER_CODES[0x0F3F] = NAME_BODY_CHAR;
361         Arrays.fill(CHARACTER_CODES, 0x0F71, 0x0F84, NAME_BODY_CHAR);
362         Arrays.fill(CHARACTER_CODES, 0x0F86, 0x0F8B, NAME_BODY_CHAR);
363         Arrays.fill(CHARACTER_CODES, 0x0F90, 0x0F95, NAME_BODY_CHAR);
364         CHARACTER_CODES[0x0F97] = NAME_BODY_CHAR;
365         Arrays.fill(CHARACTER_CODES, 0x0F99, 0x0FAD, NAME_BODY_CHAR);
366         Arrays.fill(CHARACTER_CODES, 0x0FB1, 0x0FB7, NAME_BODY_CHAR);
367         CHARACTER_CODES[0x0FB9] = NAME_BODY_CHAR;
368         Arrays.fill(CHARACTER_CODES, 0x20D0, 0x20DC, NAME_BODY_CHAR);
369         CHARACTER_CODES[0x20E1] = NAME_BODY_CHAR;
370         Arrays.fill(CHARACTER_CODES, 0x302A, 0x302F, NAME_BODY_CHAR);
371         CHARACTER_CODES[0x3099] = NAME_BODY_CHAR;
372         CHARACTER_CODES[0x309A] = NAME_BODY_CHAR;
373         // Digit
374         Arrays.fill(CHARACTER_CODES, 0x0030, 0x0039, NAME_BODY_CHAR);
375         Arrays.fill(CHARACTER_CODES, 0x0660, 0x0669, NAME_BODY_CHAR);
376         Arrays.fill(CHARACTER_CODES, 0x06F0, 0x06F9, NAME_BODY_CHAR);
377         Arrays.fill(CHARACTER_CODES, 0x0966, 0x096F, NAME_BODY_CHAR);
378         Arrays.fill(CHARACTER_CODES, 0x09E6, 0x09EF, NAME_BODY_CHAR);
379         Arrays.fill(CHARACTER_CODES, 0x0A66, 0x0A6F, NAME_BODY_CHAR);
380         Arrays.fill(CHARACTER_CODES, 0x0AE6, 0x0AEF, NAME_BODY_CHAR);
381         Arrays.fill(CHARACTER_CODES, 0x0B66, 0x0B6F, NAME_BODY_CHAR);
382         Arrays.fill(CHARACTER_CODES, 0x0BE7, 0x0BEF, NAME_BODY_CHAR);
383         Arrays.fill(CHARACTER_CODES, 0x0C66, 0x0C6F, NAME_BODY_CHAR);
384         Arrays.fill(CHARACTER_CODES, 0x0CE6, 0x0CEF, NAME_BODY_CHAR);
385         Arrays.fill(CHARACTER_CODES, 0x0D66, 0x0D6F, NAME_BODY_CHAR);
386         Arrays.fill(CHARACTER_CODES, 0x0E50, 0x0E59, NAME_BODY_CHAR);
387         Arrays.fill(CHARACTER_CODES, 0x0ED0, 0x0ED9, NAME_BODY_CHAR);
388         Arrays.fill(CHARACTER_CODES, 0x0F20, 0x0F29, NAME_BODY_CHAR);
389         // Extender
390         CHARACTER_CODES[0x00B7] = NAME_BODY_CHAR;
391         CHARACTER_CODES[0x02D0] = NAME_BODY_CHAR;
392         CHARACTER_CODES[0x02D1] = NAME_BODY_CHAR;
393         CHARACTER_CODES[0x0387] = NAME_BODY_CHAR;
394         CHARACTER_CODES[0x0640] = NAME_BODY_CHAR;
395         CHARACTER_CODES[0x0E46] = NAME_BODY_CHAR;
396         CHARACTER_CODES[0x0EC6] = NAME_BODY_CHAR;
397         CHARACTER_CODES[0x3005] = NAME_BODY_CHAR;
398         Arrays.fill(CHARACTER_CODES, 0x3031, 0x3035, NAME_BODY_CHAR);
399         Arrays.fill(CHARACTER_CODES, 0x309D, 0x309E, NAME_BODY_CHAR);
400         Arrays.fill(CHARACTER_CODES, 0x30FC, 0x30FE, NAME_BODY_CHAR);
401 
402     }
403 
404     private final Writer writer;
405     private final ArrayDeque<CharSequence> elementNames;
406     private final Set<CharSequence> currentAttributes = new HashSet<>();
407 
408     private boolean elementsWritten;
409     private boolean inElement;
410     private boolean prologWritten;
411 
412     /**
413      * Constructs an XmlWriter with the specified writer for output.
414      * @param writer the writer to write to.
415      */
416     public XmlWriter(final Writer writer) {
417         this.writer = writer;
418         this.elementNames = new ArrayDeque<>();
419     }
420 
421     /**
422      * Starts a document by writing a prolog. Calling this method is optional. When
423      * writing a document fragment, it should <em>not</em> be called.
424      *
425      * @return this object
426      * @throws OperationNotAllowedException if called after the first element has
427      * been written or once a prolog has already been written
428      */
429     @Override
430     public IXmlWriter startDocument() throws IOException {
431         if (elementsWritten) {
432             throw new OperationNotAllowedException("Document already started");
433         }
434         if (prologWritten) {
435             throw new OperationNotAllowedException("Only one prolog allowed");
436         }
437         writer.write("<?xml version='1.0'?>");
438         prologWritten = true;
439         return this;
440     }
441 
442     /**
443      * Writes the start of an element.
444      *
445      * @param elementName the name of the element, not null
446      * @return this object
447      * @throws InvalidXmlException if the name is not valid for an xml element
448      * @throws OperationNotAllowedException if called after the first element has
449      * been closed
450      */
451     @Override
452     public IXmlWriter openElement(final CharSequence elementName) throws IOException {
453         if (elementsWritten && elementNames.isEmpty()) {
454             throw new OperationNotAllowedException("Root element already closed. Cannot open new element.");
455         }
456         if (isInvalidName(elementName)) {
457             throw new InvalidXmlException("'" + elementName + "' is not a valid element name");
458         }
459         elementsWritten = true;
460         if (inElement) {
461             writer.write('>');
462         }
463         writer.write('<');
464         rawWrite(elementName);
465         inElement = true;
466         elementNames.push(elementName);
467         currentAttributes.clear();
468         return this;
469     }
470 
471     @Override
472     public IXmlWriter comment(final CharSequence text) throws IOException {
473         if (inElement) {
474             writer.write('>');
475         }
476         inElement = false;
477         writer.write("<!-- ");
478          content(text);
479          writer.write(" -->");
480          return this;
481     }
482 
483     /**
484      * Writes an attribute of an element. Note that this is only allowed directly
485      * after {@link #openElement(CharSequence)} or a previous {@code attribute} call.
486      *
487      * @param name the attribute name, not null
488      * @param value the attribute value, not null
489      * @return this object
490      * @throws InvalidXmlException if the name is not valid for an xml attribute or
491      * if a value for the attribute has already been written
492      * @throws OperationNotAllowedException if called after
493      * {@link #content(CharSequence)} or {@link #closeElement()} or before any call
494      * to {@link #openElement(CharSequence)}
495      */
496     @Override
497     public IXmlWriter attribute(final CharSequence name, final CharSequence value) throws IOException {
498         if (elementNames.isEmpty()) {
499             if (elementsWritten) {
500                 throw new OperationNotAllowedException("Root element has already been closed.");
501             }
502             throw new OperationNotAllowedException("Close called before an element has been opened.");
503         }
504         if (isInvalidName(name)) {
505             throw new InvalidXmlException("'" + name + "' is not a valid attribute name.");
506         }
507         if (!inElement) {
508             throw new InvalidXmlException("Attributes can only be written in elements");
509         }
510         if (currentAttributes.contains(name)) {
511             throw new InvalidXmlException("Each attribute can only be written once");
512         }
513         writer.write(' ');
514         rawWrite(name);
515         writer.write('=');
516         writer.write('\'');
517         writeAttributeContent(value);
518         writer.write('\'');
519         currentAttributes.add(name);
520         return this;
521     }
522 
523     private void writeAttributeContent(final CharSequence content) throws IOException {
524         writeEscaped(content, true);
525     }
526 
527     private void prepareForData() throws IOException {
528         if (elementNames.isEmpty()) {
529             if (elementsWritten) {
530                 throw new OperationNotAllowedException("Root element has already been closed.");
531             }
532             throw new OperationNotAllowedException("An element must be opened before content can be written.");
533         }
534         if (inElement) {
535             writer.write('>');
536         }
537     }
538 
539     @Override
540     public IXmlWriter content(final CharSequence content) throws IOException {
541         prepareForData();
542         writeEscaped(content, false);
543         inElement = false;
544         return this;
545     }
546 
547     @Override
548     public IXmlWriter cdata(final CharSequence content) throws IOException {
549         prepareForData();
550         StringBuilder sb = new StringBuilder(content);
551         int found;
552         while (-1 != (found = sb.indexOf("]]>"))) {
553             sb.replace(found, found + 3, "{rat:CDATA close}");
554         }
555 
556         writer.write("<![CDATA[ ");
557         for (int i = 0; i < sb.length(); i++) {
558             char c = sb.charAt(i);
559             if (isOutOfRange(c)) {
560                 writer.write(String.format("\\u%X", (int) c));
561             } else {
562                 writer.write(c);
563             }
564         }
565         writer.write(" ]]>");
566 
567         inElement = false;
568         return this;
569     }
570 
571     private void writeEscaped(final CharSequence content, final boolean isAttributeContent) throws IOException {
572         final int length = content.length();
573         for (int i = 0; i < length; i++) {
574             char character = content.charAt(i);
575             if (character == '&') {
576                 writer.write("&amp;");
577             } else if (character == '<') {
578                 writer.write("&lt;");
579             } else if (character == '>') {
580                 writer.write("&gt;");
581             } else if (isAttributeContent && character == '\'') {
582                 writer.write("&apos;");
583             } else if (isAttributeContent && character == '\"') {
584                 writer.write("&quot;");
585             } else if (isOutOfRange(character)) {
586                 writer.write('?');
587             } else {
588                 writer.write(character);
589             }
590         }
591     }
592 
593     private boolean isOutOfRange(final char character) {
594         return !ALLOWED_CHARACTERS[character];
595     }
596 
597     /**
598      * Closes the last element written.
599      *
600      * @return this object
601      * @throws OperationNotAllowedException if called before any call to
602      * {@link #openElement} or after the first element has been closed
603      */
604     @Override
605     public IXmlWriter closeElement() throws IOException {
606         if (elementNames.isEmpty()) {
607             if (elementsWritten) {
608                 throw new OperationNotAllowedException("Root element has already been closed.");
609             }
610             throw new OperationNotAllowedException("Close called before an element has been opened.");
611         }
612         final CharSequence elementName = elementNames.pop();
613         if (inElement) {
614             writer.write('/');
615             writer.write('>');
616         } else {
617             writer.write('<');
618             writer.write('/');
619             rawWrite(elementName);
620             writer.write('>');
621         }
622         writer.flush();
623         inElement = false;
624         return this;
625     }
626 
627     /**
628      * Closes back to and including the last instance of the specified element name.
629      * @param name The name of the element to close.  Must not be {@code null}.
630      * @return this object
631      * @throws OperationNotAllowedException if called before any call to
632      * {@link #openElement} or after the first element has been closed
633      */
634     @Override
635     public IXmlWriter closeElement(final CharSequence name) throws IOException {
636         Objects.requireNonNull(name);
637         if (elementNames.isEmpty()) {
638             if (elementsWritten) {
639                 throw new OperationNotAllowedException("Root element has already been closed.");
640             }
641             throw new OperationNotAllowedException("Close called before an element has been opened.");
642         }
643         CharSequence elementName = null;
644         while (!name.equals(elementName)) {
645             elementName = elementNames.pop();
646             if (inElement) {
647                 writer.write('/');
648                 writer.write('>');
649             } else {
650                 writer.write('<');
651                 writer.write('/');
652                 rawWrite(elementName);
653                 writer.write('>');
654             }
655             inElement = false;
656         }
657         writer.flush();
658         return this;
659     }
660 
661     /**
662      * Closes all pending elements. When appropriate, resources are also flushed and
663      * closed. No exception is raised when called upon a document whose root element
664      * has already been closed.
665      *
666      * @return this object
667      * @throws OperationNotAllowedException if called before any call to
668      * {@link #openElement}
669      */
670     @Override
671     public IXmlWriter closeDocument() throws IOException {
672         if (elementNames.isEmpty() && !elementsWritten) {
673             throw new OperationNotAllowedException("Close called before an element has been opened.");
674         }
675         while (!elementNames.isEmpty()) {
676             closeElement();
677         }
678         writer.flush();
679         return this;
680     }
681 
682     private void rawWrite(final CharSequence sequence) throws IOException {
683         for (int i = 0; i < sequence.length(); i++) {
684             final char charAt = sequence.charAt(i);
685             writer.write(charAt);
686         }
687     }
688 
689     private boolean isInvalidName(final CharSequence sequence) {
690         boolean result = true;
691         final int length = sequence.length();
692         for (int i = 0; i < length; i++) {
693             char character = sequence.charAt(i);
694             if (i == 0) {
695                 if (!isValidNameStart(character)) {
696                     result = false;
697                     break;
698                 }
699             } else {
700                 if (!isValidNameBody(character)) {
701                     result = false;
702                     break;
703                 }
704             }
705         }
706         return !result;
707     }
708 
709     private boolean isValidNameStart(final char character) {
710         final byte code = CHARACTER_CODES[character];
711         return (code & NAME_START_MASK) > 0;
712     }
713 
714     private boolean isValidNameBody(final char character) {
715         final byte code = CHARACTER_CODES[character];
716         return (code & NAME_MASK) > 0;
717     }
718 
719     @Override
720     public void close() throws IOException {
721         closeDocument();
722     }
723 }