/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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.
*/
/**
* Reads text from a character-input stream, buffering characters so as to
* provide for the efficient reading of characters, arrays, and lines.
*
* <p> The buffer size may be specified, or the default size may be used. The
* default is large enough for most purposes.
*
* <p> In general, each read request made of a Reader causes a corresponding
* read request to be made of the underlying character or byte stream. It is
* therefore advisable to wrap a BufferedReader around any Reader whose read()
* operations may be costly, such as FileReaders and InputStreamReaders. For
* example,
*
* <pre>
* BufferedReader in
* = new BufferedReader(new FileReader("foo.in"));
* </pre>
*
* will buffer the input from the specified file. Without buffering, each
* invocation of read() or readLine() could cause bytes to be read from the
* file, converted into characters, and then returned, which can be very
* inefficient.
*
* <p> Programs that use DataInputStreams for textual input can be localized by
* replacing each DataInputStream with an appropriate BufferedReader.
*
* @see FileReader
* @see InputStreamReader
* @see java.nio.file.Files#newBufferedReader
*
* @author Mark Reinhold
* @since JDK1.1
*/
private char cb[];
/** If the next character is a line feed, skip it */
private boolean skipLF = false;
/** The skipLF flag when the mark was set */
private boolean markedSkipLF = false;
/**
* Creates a buffering character-input stream that uses an input buffer of
* the specified size.
*
* @param in A Reader
* @param sz Input-buffer size
*
* @exception IllegalArgumentException If sz is <= 0
*/
super(in);
if (sz <= 0)
throw new IllegalArgumentException("Buffer size <= 0");
}
/**
* Creates a buffering character-input stream that uses a default-sized
* input buffer.
*
* @param in A Reader
*/
this(in, defaultCharBufferSize);
}
/** Checks to make sure that the stream has not been closed */
throw new IOException("Stream closed");
}
/**
* Fills the input buffer, taking the mark into account if it is valid.
*/
int dst;
if (markedChar <= UNMARKED) {
/* No mark */
dst = 0;
} else {
/* Marked */
if (delta >= readAheadLimit) {
/* Gone past read-ahead limit: Invalidate mark */
readAheadLimit = 0;
dst = 0;
} else {
/* Shuffle in the current buffer */
markedChar = 0;
} else {
/* Reallocate buffer to accommodate read-ahead limit */
char ncb[] = new char[readAheadLimit];
markedChar = 0;
}
}
}
int n;
do {
} while (n == 0);
if (n > 0) {
}
}
/**
* Reads a single character.
*
* @return The character read, as an integer in the range
* 0 to 65535 (<tt>0x00-0xffff</tt>), or -1 if the
* end of the stream has been reached
* @exception IOException If an I/O error occurs
*/
synchronized (lock) {
ensureOpen();
for (;;) {
fill();
return -1;
}
if (skipLF) {
skipLF = false;
nextChar++;
continue;
}
}
}
}
}
/**
* Reads characters into a portion of an array, reading from the underlying
* stream if necessary.
*/
/* If the requested length is at least as large as the buffer, and
being skipped, do not bother to copy the characters into the
local buffer. In this way buffered streams will cascade
harmlessly. */
}
fill();
}
if (skipLF) {
skipLF = false;
nextChar++;
fill();
return -1;
}
}
nextChar += n;
return n;
}
/**
* Reads characters into a portion of an array.
*
* <p> This method implements the general contract of the corresponding
* <code>{@link Reader#read(char[], int, int) read}</code> method of the
* <code>{@link Reader}</code> class. As an additional convenience, it
* attempts to read as many characters as possible by repeatedly invoking
* the <code>read</code> method of the underlying stream. This iterated
* <code>read</code> continues until one of the following conditions becomes
* true: <ul>
*
* <li> The specified number of characters have been read,
*
* <li> The <code>read</code> method of the underlying stream returns
* <code>-1</code>, indicating end-of-file, or
*
* <li> The <code>ready</code> method of the underlying stream
* returns <code>false</code>, indicating that further input requests
* would block.
*
* </ul> If the first <code>read</code> on the underlying stream returns
* <code>-1</code> to indicate end-of-file then this method returns
* <code>-1</code>. Otherwise this method returns the number of characters
* actually read.
*
* <p> Subclasses of this class are encouraged, but not required, to
* attempt to read as many characters as possible in the same fashion.
*
* <p> Ordinarily this method takes characters from this stream's character
* buffer, filling it from the underlying stream as necessary. If,
* however, the buffer is empty, the mark is not valid, and the requested
* length is at least as large as the buffer, then this method will read
* characters directly from the underlying stream into the given array.
* Thus redundant <code>BufferedReader</code>s will not copy data
* unnecessarily.
*
* @param cbuf Destination buffer
* @param off Offset at which to start storing characters
* @param len Maximum number of characters to read
*
* @return The number of characters read, or -1 if the end of the
* stream has been reached
*
* @exception IOException If an I/O error occurs
*/
synchronized (lock) {
ensureOpen();
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return 0;
}
if (n <= 0) return n;
if (n1 <= 0) break;
n += n1;
}
return n;
}
}
/**
* Reads a line of text. A line is considered to be terminated by any one
* of a line feed ('\n'), a carriage return ('\r'), or a carriage return
* followed immediately by a linefeed.
*
* @param ignoreLF If true, the next '\n' will be skipped
*
* @return A String containing the contents of the line, not including
* any line-termination characters, or null if the end of the
* stream has been reached
*
* @see java.io.LineNumberReader#readLine()
*
* @exception IOException If an I/O error occurs
*/
StringBuffer s = null;
int startChar;
synchronized (lock) {
ensureOpen();
for (;;) {
fill();
return s.toString();
else
return null;
}
boolean eol = false;
char c = 0;
int i;
/* Skip a leftover '\n', if necessary */
nextChar++;
skipLF = false;
omitLF = false;
c = cb[i];
if ((c == '\n') || (c == '\r')) {
eol = true;
break charLoop;
}
}
nextChar = i;
if (eol) {
if (s == null) {
} else {
}
nextChar++;
if (c == '\r') {
skipLF = true;
}
return str;
}
if (s == null)
s = new StringBuffer(defaultExpectedLineLength);
}
}
}
/**
* Reads a line of text. A line is considered to be terminated by any one
* of a line feed ('\n'), a carriage return ('\r'), or a carriage return
* followed immediately by a linefeed.
*
* @return A String containing the contents of the line, not including
* any line-termination characters, or null if the end of the
* stream has been reached
*
* @exception IOException If an I/O error occurs
*
* @see java.nio.file.Files#readAllLines
*/
return readLine(false);
}
/**
* Skips characters.
*
* @param n The number of characters to skip
*
* @return The number of characters actually skipped
*
* @exception IllegalArgumentException If <code>n</code> is negative.
* @exception IOException If an I/O error occurs
*/
if (n < 0L) {
throw new IllegalArgumentException("skip value is negative");
}
synchronized (lock) {
ensureOpen();
long r = n;
while (r > 0) {
fill();
break;
if (skipLF) {
skipLF = false;
nextChar++;
}
}
if (r <= d) {
nextChar += r;
r = 0;
break;
}
else {
r -= d;
}
}
return n - r;
}
}
/**
* Tells whether this stream is ready to be read. A buffered character
* stream is ready if the buffer is not empty, or if the underlying
* character stream is ready.
*
* @exception IOException If an I/O error occurs
*/
synchronized (lock) {
ensureOpen();
/*
* If newline needs to be skipped and the next char to be read
* is a newline character, then just skip it right away.
*/
if (skipLF) {
/* Note that in.ready() will return true if and only if the next
* read on the stream will not block.
*/
fill();
}
nextChar++;
skipLF = false;
}
}
}
}
/**
* Tells whether this stream supports the mark() operation, which it does.
*/
public boolean markSupported() {
return true;
}
/**
* Marks the present position in the stream. Subsequent calls to reset()
* will attempt to reposition the stream to this point.
*
* @param readAheadLimit Limit on the number of characters that may be
* read while still preserving the mark. An attempt
* to reset the stream after reading characters
* up to this limit or beyond may fail.
* A limit value larger than the size of the input
* buffer will cause a new buffer to be allocated
* whose size is no smaller than limit.
* Therefore large values should be used with care.
*
* @exception IllegalArgumentException If readAheadLimit is < 0
* @exception IOException If an I/O error occurs
*/
if (readAheadLimit < 0) {
throw new IllegalArgumentException("Read-ahead limit < 0");
}
synchronized (lock) {
ensureOpen();
this.readAheadLimit = readAheadLimit;
}
}
/**
* Resets the stream to the most recent mark.
*
* @exception IOException If the stream has never been marked,
* or if the mark has been invalidated
*/
synchronized (lock) {
ensureOpen();
if (markedChar < 0)
? "Mark invalid"
: "Stream not marked");
}
}
synchronized (lock) {
return;
}
}
}