Class java.io.FilterInputStream
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Class java.io.FilterInputStream
java.lang.Object
|
+----java.io.InputStream
|
+----java.io.FilterInputStream
- public class FilterInputStream
- extends InputStream
Abstract class representing a filtered input stream of bytes.
This class is the basis for enhancing input stream functionality.
It allows multiple input stream filters to be chained together,
each providing additional functionality.
-
in
- The actual input stream.
-
FilterInputStream(InputStream)
- Creates an input stream filter.
-
available()
- Returns the number of bytes that can be read.
-
close()
- Closes the input stream.
-
mark(int)
- Marks the current position in the input stream.
-
markSupported()
- Returns true if this stream type supports mark/reset
-
read()
- Reads a byte.
-
read(byte[])
- Reads into an array of bytes.
-
read(byte[], int, int)
- Reads into an array of bytes.
-
reset()
- Repositions the stream to the last marked position.
-
skip(long)
- Skips bytes of input.
in
protected InputStream in
- The actual input stream.
FilterInputStream
protected FilterInputStream(InputStream in)
- Creates an input stream filter.
- Parameters:
- in - the input stream
read
public int read() throws IOException
- Reads a byte. 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 InputStream
read
public int read(byte b[]) throws IOException
- Reads into an array of bytes.
Blocks until some input is available.
- Parameters:
- b - the buffer into which the data is 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 InputStream
read
public int read(byte b[],
int off,
int len) throws IOException
- Reads into an array of bytes.
Blocks until some input is available.
This method should be overridden in a subclass for
efficiency (the default implementation reads 1 byte
at a time).
- 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 InputStream
skip
public long skip(long n) throws IOException
- Skips bytes of input.
- Parameters:
- n - bytes to be skipped
- Returns:
- actual number of bytes skipped
- Throws: IOException
- If an I/O error has occurred.
- Overrides:
- skip in class InputStream
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 InputStream
close
public void close() throws IOException
- Closes the input stream. Must be called
to release any resources associated with
the stream.
- Throws: IOException
- If an I/O error has occurred.
- Overrides:
- close in class InputStream
mark
public synchronized 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 tobe read before the
mark position becomes invalid.
- Overrides:
- mark in class InputStream
reset
public synchronized 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
parse, 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 InputStream
markSupported
public boolean markSupported()
- Returns true if this stream type supports mark/reset
- Overrides:
- markSupported in class InputStream
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