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Java Standard Edition (SE)

FileImageOutputStream


javax.imageio.stream

Class FileImageOutputStream

    • Constructor Detail

      • FileImageOutputStream

        public FileImageOutputStream(RandomAccessFile raf)
        Constructs a FileImageOutputStream that will write to a given RandomAccessFile.
        Parameters:
        raf - a RandomAccessFile to write to.
        Throws:
        IllegalArgumentException - if raf is null.
    • Method Detail

      • read

        public int read()
                 throws IOException
        Description copied from class: ImageInputStreamImpl
        Reads a single byte from the stream and returns it as an int between 0 and 255. If EOF is reached, -1 is returned.

        Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.

        The bit offset within the stream must be reset to zero before the read occurs.

        Specified by:
        read in interface ImageInputStream
        Specified by:
        read in class ImageInputStreamImpl
        Returns:
        the value of the next byte in the stream, or -1 if EOF is reached.
        Throws:
        IOException - if the stream has been closed.
      • read

        public int read(byte[] b,
                        int off,
                        int len)
                 throws IOException
        Description copied from class: ImageInputStreamImpl
        Reads up to len bytes from the stream, and stores them into b starting at index off. If no bytes can be read because the end of the stream has been reached, -1 is returned.

        The bit offset within the stream must be reset to zero before the read occurs.

        Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.

        Specified by:
        read in interface ImageInputStream
        Specified by:
        read in class ImageInputStreamImpl
        Parameters:
        b - an array of bytes to be written to.
        off - the starting position within b to write to.
        len - the maximum number of bytes to read.
        Returns:
        the number of bytes actually read, or -1 to indicate EOF.
        Throws:
        IOException - if an I/O error occurs.
      • write

        public void write(int b)
                   throws IOException
        Description copied from interface: ImageOutputStream
        Writes a single byte to the stream at the current position. The 24 high-order bits of b are ignored.

        If the bit offset within the stream is non-zero, the remainder of the current byte is padded with 0s and written out first. The bit offset will be 0 after the write. Implementers can use the flushBits method of ImageOutputStreamImpl to guarantee this.

        Specified by:
        write in interface DataOutput
        Specified by:
        write in interface ImageOutputStream
        Specified by:
        write in class ImageOutputStreamImpl
        Parameters:
        b - an int whose lower 8 bits are to be written.
        Throws:
        IOException - if an I/O error occurs.
      • write

        public void write(byte[] b,
                          int off,
                          int len)
                   throws IOException
        Description copied from interface: ImageOutputStream
        Writes a sequence of bytes to the stream at the current position. If len is 0, nothing is written. The byte b[off] is written first, then the byte b[off + 1], and so on.

        If the bit offset within the stream is non-zero, the remainder of the current byte is padded with 0s and written out first. The bit offset will be 0 after the write. Implementers can use the flushBits method of ImageOutputStreamImpl to guarantee this.

        Specified by:
        write in interface DataOutput
        Specified by:
        write in interface ImageOutputStream
        Specified by:
        write in class ImageOutputStreamImpl
        Parameters:
        b - an array of bytes to be written.
        off - the start offset in the data.
        len - the number of bytes to write.
        Throws:
        IOException - if an I/O error occurs.
      • length

        public long length()
        Description copied from class: ImageInputStreamImpl
        Returns -1L to indicate that the stream has unknown length. Subclasses must override this method to provide actual length information.
        Specified by:
        length in interface ImageInputStream
        Overrides:
        length in class ImageInputStreamImpl
        Returns:
        -1L to indicate unknown length.
      • seek

        public void seek(long pos)
                  throws IOException
        Sets the current stream position and resets the bit offset to 0. It is legal to seeking past the end of the file; an EOFException will be thrown only if a read is performed. The file length will not be increased until a write is performed.
        Specified by:
        seek in interface ImageInputStream
        Overrides:
        seek in class ImageInputStreamImpl
        Parameters:
        pos - a long containing the desired file pointer position.
        Throws:
        IndexOutOfBoundsException - if pos is smaller than the flushed position.
        IOException - if any other I/O error occurs.
      • close

        public void close()
                   throws IOException
        Description copied from interface: ImageInputStream
        Closes the stream. Attempts to access a stream that has been closed may result in IOExceptions or incorrect behavior. Calling this method may allow classes implementing this interface to release resources associated with the stream such as memory, disk space, or file descriptors.
        Specified by:
        close in interface Closeable
        Specified by:
        close in interface AutoCloseable
        Specified by:
        close in interface ImageInputStream
        Overrides:
        close in class ImageInputStreamImpl
        Throws:
        IOException - if an I/O error occurs.
      • finalize

        protected void finalize()
                         throws Throwable
        Finalizes this object prior to garbage collection. The close method is called to close any open input source. This method should not be called from application code.
        Overrides:
        finalize in class ImageInputStreamImpl
        Throws:
        Throwable - if an error occurs during superclass finalization.
        See Also:
        WeakReference, PhantomReference


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