Package ch.randelshofer.io

Class ImageInputStreamAdapter

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable
    public class ImageInputStreamAdapter
extends java.io.FilterInputStream
    ImageInputStreamAdapter.

    • Constructor Summary

      Constructors 
      Constructor Description
      ImageInputStreamAdapter​(javax.imageio.stream.ImageInputStream iis)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      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, 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)

      • Methods inherited from class java.io.FilterInputStream

        read

      • Methods inherited from class java.io.InputStream

        nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • ImageInputStreamAdapter

        public ImageInputStreamAdapter​(javax.imageio.stream.ImageInputStream iis)

    • Method Detail

      • read

        public int read()
         throws java.io.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.

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

      • read

        public int read​(byte[] b,
                int off,
                int len)
         throws java.io.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 java.io.FilterInputStream
        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:
        java.lang.NullPointerException - If b is null.
        java.lang.IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
        java.io.IOException - if an I/O error occurs.
        See Also:
        FilterInputStream.in

      • skip

        public long skip​(long n)
          throws java.io.IOException

        This method simply performs in.skip(n).

        Overrides:
        skip in class java.io.FilterInputStream
        Throws:
        java.io.IOException

      • available

        public int available()
              throws java.io.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 java.io.FilterInputStream
        Returns:
        an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking.
        Throws:
        java.io.IOException - if an I/O error occurs.

      • close

        public void close()
           throws java.io.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 java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Overrides:
        close in class java.io.FilterInputStream
        Throws:
        java.io.IOException - if an I/O error occurs.
        See Also:
        FilterInputStream.in

      • 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 java.io.FilterInputStream
        Parameters:
        readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
        See Also:
        FilterInputStream.in, FilterInputStream.reset()

      • reset

        public void reset()
           throws java.io.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 java.io.FilterInputStream
        Throws:
        java.io.IOException - if the stream has not been marked or if the mark has been invalidated.
        See Also:
        FilterInputStream.in, FilterInputStream.mark(int)

      • 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 java.io.FilterInputStream
        Returns:
        true if this stream type supports the mark and reset method; false otherwise.
        See Also:
        FilterInputStream.in, InputStream.mark(int), InputStream.reset()