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src/java.base/share/classes/java/io/LineNumberReader.java

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   1 /*
   2  * Copyright (c) 1996, 2011, 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


 244             }
 245             return n - r;
 246         }
 247     }
 248 
 249     /**
 250      * Mark the present position in the stream.  Subsequent calls to reset()
 251      * will attempt to reposition the stream to this point, and will also reset
 252      * the line number appropriately.
 253      *
 254      * @param  readAheadLimit
 255      *         Limit on the number of characters that may be read while still
 256      *         preserving the mark.  After reading this many characters,
 257      *         attempting to reset the stream may fail.
 258      *
 259      * @throws  IOException
 260      *          If an I/O error occurs
 261      */
 262     public void mark(int readAheadLimit) throws IOException {
 263         synchronized (lock) {





 264             super.mark(readAheadLimit);
 265             markedLineNumber = lineNumber;
 266             markedSkipLF     = skipLF;
 267         }
 268     }
 269 
 270     /**
 271      * Reset the stream to the most recent mark.
 272      *
 273      * @throws  IOException
 274      *          If the stream has not been marked, or if the mark has been
 275      *          invalidated
 276      */
 277     public void reset() throws IOException {
 278         synchronized (lock) {
 279             super.reset();
 280             lineNumber = markedLineNumber;
 281             skipLF     = markedSkipLF;
 282         }
 283     }
   1 /*
   2  * Copyright (c) 1996, 2019, 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


 244             }
 245             return n - r;
 246         }
 247     }
 248 
 249     /**
 250      * Mark the present position in the stream.  Subsequent calls to reset()
 251      * will attempt to reposition the stream to this point, and will also reset
 252      * the line number appropriately.
 253      *
 254      * @param  readAheadLimit
 255      *         Limit on the number of characters that may be read while still
 256      *         preserving the mark.  After reading this many characters,
 257      *         attempting to reset the stream may fail.
 258      *
 259      * @throws  IOException
 260      *          If an I/O error occurs
 261      */
 262     public void mark(int readAheadLimit) throws IOException {
 263         synchronized (lock) {
 264             // If the most recently read character is '\r', then increment the
 265             // read ahead limit as in this case if the next character is '\n',
 266             // two characters would actually be read by the next read().
 267             if (skipLF)
 268                 readAheadLimit++;
 269             super.mark(readAheadLimit);
 270             markedLineNumber = lineNumber;
 271             markedSkipLF     = skipLF;
 272         }
 273     }
 274 
 275     /**
 276      * Reset the stream to the most recent mark.
 277      *
 278      * @throws  IOException
 279      *          If the stream has not been marked, or if the mark has been
 280      *          invalidated
 281      */
 282     public void reset() throws IOException {
 283         synchronized (lock) {
 284             super.reset();
 285             lineNumber = markedLineNumber;
 286             skipLF     = markedSkipLF;
 287         }
 288     }
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