Class FilterInputStream

java.lang.Object
java.io.InputStream
java.io.FilterInputStream
All Implemented Interfaces:
Closeable, AutoCloseable
Direct Known Subclasses:
BufferedInputStream, CheckedInputStream, CipherInputStream, DataInputStream, DeflaterInputStream, DigestInputStream, InflaterInputStream, LineNumberInputStream, ProgressMonitorInputStream, PushbackInputStream 
public class FilterInputStream extends InputStream
A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality. The class FilterInputStream itself simply overrides all methods of InputStream with versions that pass all requests to the contained input stream. Subclasses of FilterInputStream may further override some of these methods and may also provide additional methods and fields.
Since:
1.0

Field Summary

Modifier and Type Field Description
protected InputStream in
The input stream to be filtered.

Constructor Summary

FilterInputStream(InputStream in)
Modifier Constructor Description
protected
Creates a FilterInputStream by assigning the argument in to the field this.in so as to remember it for later use.

Method Summary

Modifier and Type Method Description
int available()
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream.
void close()
Closes this input stream and releases any system resources associated with the stream.
void mark(int readlimit)
Marks the current position in this input stream.
boolean markSupported()
Tests if this input stream supports the mark and reset methods.
int read()
Reads the next byte of data from this input stream.
int read(byte[] b)
Reads up to b.length bytes of data from this input stream into an array of bytes.
int read(byte[] b, int off, int len)
Reads up to len bytes of data from this input stream into an array of bytes.
void reset()
Repositions this stream to the position at the time the mark method was last called on this input stream.
long skip(long n)
Skips over and discards n bytes of data from the input stream.

Methods declared in class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

in

protected volatile InputStream in
The input stream to be filtered.

Constructor Details

FilterInputStream

protected FilterInputStream(InputStream in)
Creates a FilterInputStream by assigning the argument in to the field this.in so as to remember it for later use.
Parameters:
in - the underlying input stream, or null if this instance is to be created without an underlying stream.

Method Details

read

public int read() throws IOException
Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

This method simply performs in.read() and returns the result.

Specified by:
read in class InputStream
Returns:
the next byte of data, or -1 if the end of the stream is reached.
Throws:
IOException - if an I/O error occurs.
See Also:

read

public int read(byte[] b) throws IOException
Reads up to b.length bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

This method simply performs the call read(b, 0, b.length) and returns the result. It is important that it does not do in.read(b) instead; certain subclasses of FilterInputStream depend on the implementation strategy actually used.

Overrides:
read in class InputStream
Parameters:
b - the buffer into which the data is read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
IOException - if an I/O error occurs.
See Also:

read

public int read(byte[] b, int off, int len) throws IOException
Reads up to len bytes of data from this input stream into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned.

This method simply performs in.read(b, off, len) and returns the result.

Overrides:
read in class InputStream
Parameters:
b - the buffer into which the data is read.
off - the start offset in the destination array b
len - the maximum number of bytes read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
NullPointerException - If b is null.
IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
IOException - if an I/O error occurs.
See Also:

skip

public long skip(long n) throws IOException
Skips over and discards n bytes of data from the input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. The actual number of bytes skipped is returned.

This method simply performs in.skip(n).

Overrides:
skip in class InputStream
Parameters:
n - the number of bytes to be skipped.
Returns:
the actual number of bytes skipped.
Throws:
IOException - if in.skip(n) throws an IOException.
See Also:

available

public int available() throws IOException
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream. The next caller might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

This method returns the result of in.available().

Overrides:
available in class InputStream
Returns:
an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking.
Throws:
IOException - if an I/O error occurs.

close

public void close() throws IOException
Closes this input stream and releases any system resources associated with the stream. This method simply performs in.close().
Specified by:
close in interface AutoCloseable
Specified by:
close in interface Closeable
Overrides:
close in class InputStream
Throws:
IOException - if an I/O error occurs.
See Also:

mark

public void mark(int readlimit)
Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

The readlimit argument tells this input stream to allow that many bytes to be read before the mark position gets invalidated.

This method simply performs in.mark(readlimit).

Overrides:
mark in class InputStream
Parameters:
readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
See Also:

reset

public void reset() throws IOException
Repositions this stream to the position at the time the mark method was last called on this input stream.

This method simply performs in.reset().

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. If this happens within readlimit bytes, it allows the outer code to reset the stream and try another parser.

Overrides:
reset in class InputStream
Throws:
IOException - if the stream has not been marked or if the mark has been invalidated.
See Also:

markSupported

public boolean markSupported()
Tests if this input stream supports the mark and reset methods. This method simply performs in.markSupported().
Overrides:
markSupported in class InputStream
Returns:
true if this stream type supports the mark and reset method; false otherwise.
See Also:

© 1993, 2021, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/FilterInputStream.html