Class java.io.LineNumberInputStream
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Class java.io.LineNumberInputStream
java.lang.Object
|
+----java.io.InputStream
|
+----java.io.FilterInputStream
|
+----java.io.LineNumberInputStream
- public class LineNumberInputStream
- extends FilterInputStream
An input stream that keeps track of line numbers.
-
LineNumberInputStream(InputStream)
- Constructs a new LineNumberInputStream initialized with
the specified input stream
-
available()
- Returns the number of bytes that can be read.
-
getLineNumber()
- Returns the current line number.
-
mark(int)
- Marks the current position in the input stream.
-
read()
- Reads a byte of data.
-
read(byte[], int, int)
- Reads into an array of bytes.
-
reset()
- Repositions the stream to the last marked position.
-
setLineNumber(int)
- Sets the current line number.
-
skip(long)
- Skips n bytes of input.
LineNumberInputStream
public LineNumberInputStream(InputStream in)
- Constructs a new LineNumberInputStream initialized with
the specified input stream
- Parameters:
- in - the input stream
read
public int read() throws IOException
- Reads a byte of data. The method will block if no input is
available.
- Returns:
- the byte read, or -1 if the end of the
stream is reached.
- Throws: IOException
- If an I/O error has occurred.
- Overrides:
- read in class FilterInputStream
read
public int read(byte b[],
int off,
int len) throws IOException
- Reads into an array of bytes. This method will
blocks until some input is available.
- Parameters:
- b - the buffer into which the data is read
- off - the start offset of the data
- len - the maximum number of bytes read
- Returns:
- the actual number of bytes read, -1 is
returned when the end of the stream is reached.
- Throws: IOException
- If an I/O error has occurred.
- Overrides:
- read in class FilterInputStream
setLineNumber
public void setLineNumber(int lineNumber)
- Sets the current line number.
- Parameters:
- lineNumber - the line number to be set
getLineNumber
public int getLineNumber()
- Returns the current line number.
skip
public long skip(long n) throws IOException
- Skips n bytes of input.
- Parameters:
- n - the number of bytes to be skipped
- Returns:
- the actual number of bytes skipped.
- Throws: IOException
- If an I/O error has occurred.
- Overrides:
- skip in class FilterInputStream
available
public int available() throws IOException
- Returns the number of bytes that can be read.
without blocking.
- Returns:
- the number of available bytes
- Overrides:
- available in class FilterInputStream
mark
public void mark(int readlimit)
- Marks the current position in the input stream. A subsequent
call to reset() will reposition the stream at the last
marked position so that subsequent reads will re-read
the same bytes. The stream promises to allow readlimit bytes
to be read before the mark position gets invalidated.
- Parameters:
- readlimit - the maximum limit of bytes allowed to be read
before the mark position becomes invalid.
- Overrides:
- mark in class FilterInputStream
reset
public void reset() throws IOException
- Repositions the stream to the last marked position. If the
stream has not been marked, or if the mark has been invalidated,
an IOException is thrown. Stream marks are intended to be used in
situations where you need to read ahead a little to see what's in
the stream. Often this is most easily done by invoking some
general parser. If the stream is of the type handled by the
parser, it just chugs along happily. If the stream is *not* of
that type, the parser should toss an exception when it fails,
which, if it happens within readlimit bytes, allows the outer
code to reset the stream and try another parser.
- Overrides:
- reset in class FilterInputStream
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