Class BoundedBufferedReader
- All Implemented Interfaces:
Closeable
,AutoCloseable
,Readable
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Field Summary
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Constructor Summary
ConstructorDescriptionCreates a buffering character-input stream that uses a default-sized input buffer.BoundedBufferedReader
(Reader in, int sz) Creates a buffering character-input stream that uses an input buffer of the specified size. -
Method Summary
Modifier and TypeMethodDescriptionvoid
close()
void
mark
(int readAheadLimit) Marks the present position in the stream.boolean
Tells whether this stream supports the mark() operation, which it does.int
read()
Reads a single character.int
read
(char[] cbuf, int off, int len) Reads characters into a portion of an array.readLine()
Reads a line of text.boolean
ready()
Tells whether this stream is ready to be read.void
reset()
Resets the stream to the most recent mark.long
skip
(long n) Skips characters.Methods inherited from class java.io.Reader
nullReader, read, read, transferTo
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Constructor Details
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BoundedBufferedReader
Creates a buffering character-input stream that uses an input buffer of the specified size.- Parameters:
in
- A Readersz
- Input-buffer size- Throws:
IllegalArgumentException
- If sz is <= 0
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BoundedBufferedReader
Creates a buffering character-input stream that uses a default-sized input buffer.- Parameters:
in
- A Reader
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Method Details
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read
Reads a single character.- Overrides:
read
in classReader
- Returns:
- The character read, as an integer in the range 0 to 65535 (
0x00-0xffff
), or -1 if the end of the stream has been reached - Throws:
IOException
- If an I/O error occurs
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read
Reads characters into a portion of an array.This method implements the general contract of the corresponding
method of theread
class. As an additional convenience, it attempts to read as many characters as possible by repeatedly invoking theReader
read
method of the underlying stream. This iteratedread
continues until one of the following conditions becomes true:- The specified number of characters have been read,
- The
read
method of the underlying stream returns-1
, indicating end-of-file, or - The
ready
method of the underlying stream returnsfalse
, indicating that further input requests would block.
read
on the underlying stream returns-1
to indicate end-of-file then this method returns-1
. Otherwise this method returns the number of characters actually read.Subclasses of this class are encouraged, but not required, to attempt to read as many characters as possible in the same fashion.
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
BufferedReader
s will not copy data unnecessarily.- Specified by:
read
in classReader
- Parameters:
cbuf
- Destination bufferoff
- Offset at which to start storing characterslen
- Maximum number of characters to read- Returns:
- The number of characters read, or -1 if the end of the stream has been reached
- Throws:
IOException
- If an I/O error occurs
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readLine
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.- Returns:
- 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
- Throws:
IOException
- If an I/O error occurs
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skip
Skips characters.- Overrides:
skip
in classReader
- Parameters:
n
- The number of characters to skip- Returns:
- The number of characters actually skipped
- Throws:
IllegalArgumentException
- Ifn
is negative.IOException
- If an I/O error occurs
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ready
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.- Overrides:
ready
in classReader
- Throws:
IOException
- If an I/O error occurs
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markSupported
public boolean markSupported()Tells whether this stream supports the mark() operation, which it does.- Overrides:
markSupported
in classReader
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mark
Marks the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point.- Overrides:
mark
in classReader
- Parameters:
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.- Throws:
IllegalArgumentException
- If readAheadLimit is < 0IOException
- If an I/O error occurs
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reset
Resets the stream to the most recent mark.- Overrides:
reset
in classReader
- Throws:
IOException
- If the stream has never been marked, or if the mark has been invalidated
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close
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Specified by:
close
in classReader
- Throws:
IOException
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