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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 | } | ||