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Android Reference

FilterInputStream


java.io

Class FilterInputStream

    • Field Summary

      Fields
      Modifier and Type Field and Description
      protected InputStream in
      The source input stream that is filtered.
    • Constructor Summary

      Constructors
      Modifier Constructor and Description
      protected FilterInputStream(InputStream in)
      Constructs a new FilterInputStream with the specified input stream as source.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      int available()
      Returns an estimated number of bytes that can be read or skipped without blocking for more input.
      void close()
      Closes this stream.
      void mark(int readlimit)
      Sets a mark position in this stream.
      boolean markSupported()
      Indicates whether this stream supports mark() and reset().
      int read()
      Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255.
      int read(byte[] buffer, int offset, int count)
      Reads at most count bytes from this stream and stores them in the byte array buffer starting at offset.
      void reset()
      Resets this stream to the last marked location.
      long skip(long byteCount)
      Skips byteCount bytes in this stream.
    • Field Detail

      • in

        protected volatile InputStream in
        The source input stream that is filtered.
    • Constructor Detail

      • FilterInputStream

        protected FilterInputStream(InputStream in)
        Constructs a new FilterInputStream with the specified input stream as source.

        Warning: passing a null source creates an invalid FilterInputStream, that fails on every method that is not overridden. Subclasses should check for null in their constructors.

        Parameters:
        in - the input stream to filter reads on.
    • Method Detail

      • available

        public int available()
                      throws IOException
        Description copied from class: InputStream
        Returns an estimated number of bytes that can be read or skipped without blocking for more input.

        Note that this method provides such a weak guarantee that it is not very useful in practice.

        Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.

        Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".

        Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.

        It is particularly important to realize that you must not use this method to size a container and assume that you can read the entirety of the stream without needing to resize the container. Such callers should probably write everything they read to a ByteArrayOutputStream and convert that to a byte array. Alternatively, if you're reading from a file, File.length() returns the current length of the file (though assuming the file's length can't change may be incorrect, reading a file is inherently racy).

        The default implementation of this method in InputStream always returns 0. Subclasses should override this method if they are able to indicate the number of bytes available.

        Overrides:
        available in class InputStream
        Returns:
        the estimated number of bytes available
        Throws:
        IOException - if this stream is closed or an error occurs
      • mark

        public void mark(int readlimit)
        Sets a mark position in this stream. The parameter readlimit indicates how many bytes can be read before the mark is invalidated. Sending reset() will reposition this stream back to the marked position, provided that readlimit has not been surpassed.

        This implementation sets a mark in the filtered stream.

        Overrides:
        mark in class InputStream
        Parameters:
        readlimit - the number of bytes that can be read from this stream before the mark is invalidated.
        See Also:
        markSupported(), reset()
      • markSupported

        public boolean markSupported()
        Indicates whether this stream supports mark() and reset(). This implementation returns whether or not the filtered stream supports marking.
        Overrides:
        markSupported in class InputStream
        Returns:
        true if mark() and reset() are supported, false otherwise.
        See Also:
        mark(int), reset(), skip(long)
      • read

        public int read()
                 throws IOException
        Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255. Returns -1 if the end of this stream has been reached.
        Specified by:
        read in class InputStream
        Returns:
        the byte read or -1 if the end of the filtered stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.
      • read

        public int read(byte[] buffer,
               int offset,
               int count)
                 throws IOException
        Reads at most count bytes from this stream and stores them in the byte array buffer starting at offset. Returns the number of bytes actually read or -1 if no bytes have been read and the end of this stream has been reached. This implementation reads bytes from the filtered stream.
        Overrides:
        read in class InputStream
        Parameters:
        buffer - the byte array in which to store the bytes read.
        offset - the initial position in buffer to store the bytes read from this stream.
        count - the maximum number of bytes to store in buffer.
        Returns:
        the number of bytes actually read or -1 if the end of the filtered stream has been reached while reading.
        Throws:
        IOException - if this stream is closed or another I/O error occurs.
      • reset

        public void reset()
                   throws IOException
        Resets this stream to the last marked location. This implementation resets the target stream.
        Overrides:
        reset in class InputStream
        Throws:
        IOException - if this stream is already closed, no mark has been set or the mark is no longer valid because more than readlimit bytes have been read since setting the mark.
        See Also:
        mark(int), markSupported()
      • skip

        public long skip(long byteCount)
                  throws IOException
        Skips byteCount bytes in this stream. Subsequent calls to read will not return these bytes unless reset is used. This implementation skips byteCount bytes in the filtered stream.
        Overrides:
        skip in class InputStream
        Parameters:
        byteCount - the number of bytes to skip.
        Returns:
        the number of bytes actually skipped.
        Throws:
        IOException - if this stream is closed or another IOException occurs.
        See Also:
        mark(int), reset()


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