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Diffstat (limited to 'libjava/classpath/gnu/regexp/CharIndexedInputStream.java')
| -rw-r--r-- | libjava/classpath/gnu/regexp/CharIndexedInputStream.java | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/libjava/classpath/gnu/regexp/CharIndexedInputStream.java b/libjava/classpath/gnu/regexp/CharIndexedInputStream.java deleted file mode 100644 index 290a94e..0000000 --- a/libjava/classpath/gnu/regexp/CharIndexedInputStream.java +++ /dev/null @@ -1,181 +0,0 @@ -/* gnu/regexp/CharIndexedInputStream.java - Copyright (C) 1998-2001, 2004, 2006 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath 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 for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - -package gnu.regexp; -import java.io.BufferedInputStream; -import java.io.IOException; -import java.io.InputStream; - -// TODO: move(x) shouldn't rely on calling next() x times - -class CharIndexedInputStream implements CharIndexed { - private static final int BUFFER_INCREMENT = 1024; - private static final int UNKNOWN = Integer.MAX_VALUE; // value for end - - private BufferedInputStream br; - - // so that we don't try to reset() right away - private int index = -1; - - private int bufsize = BUFFER_INCREMENT; - - private int end = UNKNOWN; - - private char cached = OUT_OF_BOUNDS; - - // Big enough for a \r\n pair - // lookBehind[0] = most recent - // lookBehind[1] = second most recent - private char[] lookBehind = new char[] { OUT_OF_BOUNDS, OUT_OF_BOUNDS }; - - CharIndexedInputStream(InputStream str, int index) { - if (str instanceof BufferedInputStream) br = (BufferedInputStream) str; - else br = new BufferedInputStream(str,BUFFER_INCREMENT); - next(); - if (index > 0) move(index); - } - - private boolean next() { - if (end == 1) return false; - end--; // closer to end - - try { - if (index != -1) { - br.reset(); - } - int i = br.read(); - br.mark(bufsize); - if (i == -1) { - end = 1; - cached = OUT_OF_BOUNDS; - return false; - } - cached = (char) i; - index = 1; - } catch (IOException e) { - e.printStackTrace(); - cached = OUT_OF_BOUNDS; - return false; - } - return true; - } - - public char charAt(int index) { - if (index == 0) { - return cached; - } else if (index >= end) { - return OUT_OF_BOUNDS; - } else if (index == -1) { - return lookBehind[0]; - } else if (index == -2) { - return lookBehind[1]; - } else if (index < -2) { - return OUT_OF_BOUNDS; - } else if (index >= bufsize) { - // Allocate more space in the buffer. - try { - while (bufsize <= index) bufsize += BUFFER_INCREMENT; - br.reset(); - br.mark(bufsize); - br.skip(index-1); - } catch (IOException e) { } - } else if (this.index != index) { - try { - br.reset(); - br.skip(index-1); - } catch (IOException e) { } - } - char ch = OUT_OF_BOUNDS; - - try { - int i = br.read(); - this.index = index+1; // this.index is index of next pos relative to charAt(0) - if (i == -1) { - // set flag that next should fail next time? - end = index; - return ch; - } - ch = (char) i; - } catch (IOException ie) { } - - return ch; - } - - public boolean move(int index) { - // move read position [index] clicks from 'charAt(0)' - boolean retval = true; - while (retval && (index-- > 0)) retval = next(); - return retval; - } - - public boolean isValid() { - return (cached != OUT_OF_BOUNDS); - } - - public CharIndexed lookBehind(int index, int length) { - throw new UnsupportedOperationException( - "difficult to look behind for an input stream"); - } - - public int length() { - throw new UnsupportedOperationException( - "difficult to tell the length for an input stream"); - } - - public void setLastMatch(REMatch match) { - throw new UnsupportedOperationException( - "difficult to support setLastMatch for an input stream"); - } - - public REMatch getLastMatch() { - throw new UnsupportedOperationException( - "difficult to support getLastMatch for an input stream"); - } - - public int getAnchor() { - throw new UnsupportedOperationException( - "difficult to support getAnchor for an input stream"); - } - - public void setAnchor(int anchor) { - throw new UnsupportedOperationException( - "difficult to support setAnchor for an input stream"); - } - - -} - |