| /* |
| * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package javax.swing.text.rtf; |
| |
| import java.io.*; |
| import java.lang.*; |
| |
| /** |
| * A generic superclass for streams which read and parse text |
| * consisting of runs of characters interspersed with occasional |
| * ``specials'' (formatting characters). |
| * |
| * <p> Most of the functionality |
| * of this class would be redundant except that the |
| * <code>ByteToChar</code> converters |
| * are suddenly private API. Presumably this class will disappear |
| * when the API is made public again. (sigh) That will also let us handle |
| * multibyte character sets... |
| * |
| * <P> A subclass should override at least <code>write(char)</code> |
| * and <code>writeSpecial(int)</code>. For efficiency's sake it's a |
| * good idea to override <code>write(String)</code> as well. The subclass' |
| * initializer may also install appropriate translation and specials tables. |
| * |
| * @see OutputStream |
| */ |
| abstract class AbstractFilter extends OutputStream |
| { |
| /** A table mapping bytes to characters */ |
| protected char translationTable[]; |
| /** A table indicating which byte values should be interpreted as |
| * characters and which should be treated as formatting codes */ |
| protected boolean specialsTable[]; |
| |
| /** A translation table which does ISO Latin-1 (trivial) */ |
| static final char latin1TranslationTable[]; |
| /** A specials table which indicates that no characters are special */ |
| static final boolean noSpecialsTable[]; |
| /** A specials table which indicates that all characters are special */ |
| static final boolean allSpecialsTable[]; |
| |
| static { |
| int i; |
| |
| noSpecialsTable = new boolean[256]; |
| for (i = 0; i < 256; i++) |
| noSpecialsTable[i] = false; |
| |
| allSpecialsTable = new boolean[256]; |
| for (i = 0; i < 256; i++) |
| allSpecialsTable[i] = true; |
| |
| latin1TranslationTable = new char[256]; |
| for (i = 0; i < 256; i++) |
| latin1TranslationTable[i] = (char)i; |
| } |
| |
| /** |
| * A convenience method that reads text from a FileInputStream |
| * and writes it to the receiver. |
| * The format in which the file |
| * is read is determined by the concrete subclass of |
| * AbstractFilter to which this method is sent. |
| * <p>This method does not close the receiver after reaching EOF on |
| * the input stream. |
| * The user must call <code>close()</code> to ensure that all |
| * data are processed. |
| * |
| * @param in An InputStream providing text. |
| */ |
| public void readFromStream(InputStream in) |
| throws IOException |
| { |
| byte buf[]; |
| int count; |
| |
| buf = new byte[16384]; |
| |
| while(true) { |
| count = in.read(buf); |
| if (count < 0) |
| break; |
| |
| this.write(buf, 0, count); |
| } |
| } |
| |
| public void readFromReader(Reader in) |
| throws IOException |
| { |
| char buf[]; |
| int count; |
| |
| buf = new char[2048]; |
| |
| while(true) { |
| count = in.read(buf); |
| if (count < 0) |
| break; |
| for (int i = 0; i < count; i++) { |
| this.write(buf[i]); |
| } |
| } |
| } |
| |
| public AbstractFilter() |
| { |
| translationTable = latin1TranslationTable; |
| specialsTable = noSpecialsTable; |
| } |
| |
| /** |
| * Implements the abstract method of OutputStream, of which this class |
| * is a subclass. |
| */ |
| public void write(int b) |
| throws IOException |
| { |
| if (b < 0) |
| b += 256; |
| if (specialsTable[b]) |
| writeSpecial(b); |
| else { |
| char ch = translationTable[b]; |
| if (ch != (char)0) |
| write(ch); |
| } |
| } |
| |
| /** |
| * Implements the buffer-at-a-time write method for greater |
| * efficiency. |
| * |
| * <p> <strong>PENDING:</strong> Does <code>write(byte[])</code> |
| * call <code>write(byte[], int, int)</code> or is it the other way |
| * around? |
| */ |
| public void write(byte[] buf, int off, int len) |
| throws IOException |
| { |
| StringBuilder accumulator = null; |
| while (len > 0) { |
| short b = (short)buf[off]; |
| |
| // stupid signed bytes |
| if (b < 0) |
| b += 256; |
| |
| if (specialsTable[b]) { |
| if (accumulator != null) { |
| write(accumulator.toString()); |
| accumulator = null; |
| } |
| writeSpecial(b); |
| } else { |
| char ch = translationTable[b]; |
| if (ch != (char)0) { |
| if (accumulator == null) |
| accumulator = new StringBuilder(); |
| accumulator.append(ch); |
| } |
| } |
| |
| len --; |
| off ++; |
| } |
| |
| if (accumulator != null) |
| write(accumulator.toString()); |
| } |
| |
| /** |
| * Hopefully, all subclasses will override this method to accept strings |
| * of text, but if they don't, AbstractFilter's implementation |
| * will spoon-feed them via <code>write(char)</code>. |
| * |
| * @param s The string of non-special characters written to the |
| * OutputStream. |
| */ |
| public void write(String s) |
| throws IOException |
| { |
| int index, length; |
| |
| length = s.length(); |
| for(index = 0; index < length; index ++) { |
| write(s.charAt(index)); |
| } |
| } |
| |
| /** |
| * Subclasses must provide an implementation of this method which |
| * accepts a single (non-special) character. |
| * |
| * @param ch The character written to the OutputStream. |
| */ |
| protected abstract void write(char ch) throws IOException; |
| |
| /** |
| * Subclasses must provide an implementation of this method which |
| * accepts a single special byte. No translation is performed |
| * on specials. |
| * |
| * @param b The byte written to the OutputStream. |
| */ |
| protected abstract void writeSpecial(int b) throws IOException; |
| } |