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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2010, 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 | +package javax.swing.text.rtf; | |
| 26 | + | |
| 27 | +import java.io.*; | |
| 28 | +import java.lang.*; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * A generic superclass for streams which read and parse text | |
| 32 | + * consisting of runs of characters interspersed with occasional | |
| 33 | + * ``specials'' (formatting characters). | |
| 34 | + * | |
| 35 | + * <p> Most of the functionality | |
| 36 | + * of this class would be redundant except that the | |
| 37 | + * <code>ByteToChar</code> converters | |
| 38 | + * are suddenly private API. Presumably this class will disappear | |
| 39 | + * when the API is made public again. (sigh) That will also let us handle | |
| 40 | + * multibyte character sets... | |
| 41 | + * | |
| 42 | + * <P> A subclass should override at least <code>write(char)</code> | |
| 43 | + * and <code>writeSpecial(int)</code>. For efficiency's sake it's a | |
| 44 | + * good idea to override <code>write(String)</code> as well. The subclass' | |
| 45 | + * initializer may also install appropriate translation and specials tables. | |
| 46 | + * | |
| 47 | + * @see OutputStream | |
| 48 | + */ | |
| 49 | +abstract class AbstractFilter extends OutputStream | |
| 50 | +{ | |
| 51 | + /** A table mapping bytes to characters */ | |
| 52 | + protected char translationTable[]; | |
| 53 | + /** A table indicating which byte values should be interpreted as | |
| 54 | + * characters and which should be treated as formatting codes */ | |
| 55 | + protected boolean specialsTable[]; | |
| 56 | + | |
| 57 | + /** A translation table which does ISO Latin-1 (trivial) */ | |
| 58 | + static final char latin1TranslationTable[]; | |
| 59 | + /** A specials table which indicates that no characters are special */ | |
| 60 | + static final boolean noSpecialsTable[]; | |
| 61 | + /** A specials table which indicates that all characters are special */ | |
| 62 | + static final boolean allSpecialsTable[]; | |
| 63 | + | |
| 64 | + static { | |
| 65 | + int i; | |
| 66 | + | |
| 67 | + noSpecialsTable = new boolean[256]; | |
| 68 | + for (i = 0; i < 256; i++) | |
| 69 | + noSpecialsTable[i] = false; | |
| 70 | + | |
| 71 | + allSpecialsTable = new boolean[256]; | |
| 72 | + for (i = 0; i < 256; i++) | |
| 73 | + allSpecialsTable[i] = true; | |
| 74 | + | |
| 75 | + latin1TranslationTable = new char[256]; | |
| 76 | + for (i = 0; i < 256; i++) | |
| 77 | + latin1TranslationTable[i] = (char)i; | |
| 78 | + } | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * A convenience method that reads text from a FileInputStream | |
| 82 | + * and writes it to the receiver. | |
| 83 | + * The format in which the file | |
| 84 | + * is read is determined by the concrete subclass of | |
| 85 | + * AbstractFilter to which this method is sent. | |
| 86 | + * <p>This method does not close the receiver after reaching EOF on | |
| 87 | + * the input stream. | |
| 88 | + * The user must call <code>close()</code> to ensure that all | |
| 89 | + * data are processed. | |
| 90 | + * | |
| 91 | + * @param in An InputStream providing text. | |
| 92 | + */ | |
| 93 | + public void readFromStream(InputStream in) | |
| 94 | + throws IOException | |
| 95 | + { | |
| 96 | + byte buf[]; | |
| 97 | + int count; | |
| 98 | + | |
| 99 | + buf = new byte[16384]; | |
| 100 | + | |
| 101 | + while(true) { | |
| 102 | + count = in.read(buf); | |
| 103 | + if (count < 0) | |
| 104 | + break; | |
| 105 | + | |
| 106 | + this.write(buf, 0, count); | |
| 107 | + } | |
| 108 | + } | |
| 109 | + | |
| 110 | + public void readFromReader(Reader in) | |
| 111 | + throws IOException | |
| 112 | + { | |
| 113 | + char buf[]; | |
| 114 | + int count; | |
| 115 | + | |
| 116 | + buf = new char[2048]; | |
| 117 | + | |
| 118 | + while(true) { | |
| 119 | + count = in.read(buf); | |
| 120 | + if (count < 0) | |
| 121 | + break; | |
| 122 | + for (int i = 0; i < count; i++) { | |
| 123 | + this.write(buf[i]); | |
| 124 | + } | |
| 125 | + } | |
| 126 | + } | |
| 127 | + | |
| 128 | + public AbstractFilter() | |
| 129 | + { | |
| 130 | + translationTable = latin1TranslationTable; | |
| 131 | + specialsTable = noSpecialsTable; | |
| 132 | + } | |
| 133 | + | |
| 134 | + /** | |
| 135 | + * Implements the abstract method of OutputStream, of which this class | |
| 136 | + * is a subclass. | |
| 137 | + */ | |
| 138 | + public void write(int b) | |
| 139 | + throws IOException | |
| 140 | + { | |
| 141 | + if (b < 0) | |
| 142 | + b += 256; | |
| 143 | + if (specialsTable[b]) | |
| 144 | + writeSpecial(b); | |
| 145 | + else { | |
| 146 | + char ch = translationTable[b]; | |
| 147 | + if (ch != (char)0) | |
| 148 | + write(ch); | |
| 149 | + } | |
| 150 | + } | |
| 151 | + | |
| 152 | + /** | |
| 153 | + * Implements the buffer-at-a-time write method for greater | |
| 154 | + * efficiency. | |
| 155 | + * | |
| 156 | + * <p> <strong>PENDING:</strong> Does <code>write(byte[])</code> | |
| 157 | + * call <code>write(byte[], int, int)</code> or is it the other way | |
| 158 | + * around? | |
| 159 | + */ | |
| 160 | + public void write(byte[] buf, int off, int len) | |
| 161 | + throws IOException | |
| 162 | + { | |
| 163 | + StringBuilder accumulator = null; | |
| 164 | + while (len > 0) { | |
| 165 | + short b = (short)buf[off]; | |
| 166 | + | |
| 167 | + // stupid signed bytes | |
| 168 | + if (b < 0) | |
| 169 | + b += 256; | |
| 170 | + | |
| 171 | + if (specialsTable[b]) { | |
| 172 | + if (accumulator != null) { | |
| 173 | + write(accumulator.toString()); | |
| 174 | + accumulator = null; | |
| 175 | + } | |
| 176 | + writeSpecial(b); | |
| 177 | + } else { | |
| 178 | + char ch = translationTable[b]; | |
| 179 | + if (ch != (char)0) { | |
| 180 | + if (accumulator == null) | |
| 181 | + accumulator = new StringBuilder(); | |
| 182 | + accumulator.append(ch); | |
| 183 | + } | |
| 184 | + } | |
| 185 | + | |
| 186 | + len --; | |
| 187 | + off ++; | |
| 188 | + } | |
| 189 | + | |
| 190 | + if (accumulator != null) | |
| 191 | + write(accumulator.toString()); | |
| 192 | + } | |
| 193 | + | |
| 194 | + /** | |
| 195 | + * Hopefully, all subclasses will override this method to accept strings | |
| 196 | + * of text, but if they don't, AbstractFilter's implementation | |
| 197 | + * will spoon-feed them via <code>write(char)</code>. | |
| 198 | + * | |
| 199 | + * @param s The string of non-special characters written to the | |
| 200 | + * OutputStream. | |
| 201 | + */ | |
| 202 | + public void write(String s) | |
| 203 | + throws IOException | |
| 204 | + { | |
| 205 | + int index, length; | |
| 206 | + | |
| 207 | + length = s.length(); | |
| 208 | + for(index = 0; index < length; index ++) { | |
| 209 | + write(s.charAt(index)); | |
| 210 | + } | |
| 211 | + } | |
| 212 | + | |
| 213 | + /** | |
| 214 | + * Subclasses must provide an implementation of this method which | |
| 215 | + * accepts a single (non-special) character. | |
| 216 | + * | |
| 217 | + * @param ch The character written to the OutputStream. | |
| 218 | + */ | |
| 219 | + protected abstract void write(char ch) throws IOException; | |
| 220 | + | |
| 221 | + /** | |
| 222 | + * Subclasses must provide an implementation of this method which | |
| 223 | + * accepts a single special byte. No translation is performed | |
| 224 | + * on specials. | |
| 225 | + * | |
| 226 | + * @param b The byte written to the OutputStream. | |
| 227 | + */ | |
| 228 | + protected abstract void writeSpecial(int b) throws IOException; | |
| 229 | +} | |