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com.imagero.uio.io
Class RandomAccessInputStream  view RandomAccessInputStream download RandomAccessInputStream.java

java.lang.Object
  extended byjava.io.InputStream
      extended bycom.imagero.uio.io.RandomAccessInputStream
All Implemented Interfaces:
java.io.Closeable
Direct Known Subclasses:
TIFFStripInputStream

public class RandomAccessInputStream
extends java.io.InputStream

same as FilterInputStream but with RandomAccess


Field Summary
protected  long mark
           
protected static long MARK_UNDEFINED
           
protected  long pos
           
protected  com.imagero.uio.RandomAccessRO ro
           
protected  long startPos
           
 
Constructor Summary
RandomAccessInputStream(com.imagero.uio.RandomAccessRO ro)
           
RandomAccessInputStream(com.imagero.uio.RandomAccessRO ro, long startPos)
           
 
Method Summary
 int available()
          This method returns the number of bytes that can be read from this stream before a read can block.
protected  void checkPos()
           
 void close()
          releases reference to RandomAccessRO, but does not closes it
 void mark(int i)
          This method marks a position in the input to which the stream can be "reset" by calling the reset() method.
 boolean markSupported()
          This method returns a boolean that indicates whether the mark/reset methods are supported in this class.
 int read()
          This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255.
 int read(byte[] b)
          This method reads bytes from a stream and stores them into a caller supplied buffer.
 int read(byte[] b, int off, int len)
          This method read bytes from a stream and stores them into a caller supplied buffer.
 void reset()
          This method resets a stream to the point where the mark() method was called.
 long skip(long l)
          This method skips the specified number of bytes in the stream.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

MARK_UNDEFINED

protected static long MARK_UNDEFINED

ro

protected com.imagero.uio.RandomAccessRO ro

pos

protected long pos

mark

protected long mark

startPos

protected long startPos
Constructor Detail

RandomAccessInputStream

public RandomAccessInputStream(com.imagero.uio.RandomAccessRO ro)

RandomAccessInputStream

public RandomAccessInputStream(com.imagero.uio.RandomAccessRO ro,
                               long startPos)
Method Detail

read

public int read()
         throws java.io.IOException
Description copied from class: java.io.InputStream
This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255. This method also will return -1 if the end of the stream has been reached.

This method will block until the byte can be read.


read

public int read(byte[] b)
         throws java.io.IOException
Description copied from class: java.io.InputStream
This method reads bytes from a stream and stores them into a caller supplied buffer. This method attempts to completely fill the buffer, but can return before doing so. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling an overloaded read method like so: read(b, 0, b.length)


read

public int read(byte[] b,
                int off,
                int len)
         throws java.io.IOException
Description copied from class: java.io.InputStream
This method read bytes from a stream and stores them into a caller supplied buffer. It starts storing the data at index off into the buffer and attempts to read len bytes. This method can return before reading the number of bytes requested. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling the single byte read() method in a loop until the desired number of bytes are read. The read loop stops short if the end of the stream is encountered or if an IOException is encountered on any read operation except the first. If the first attempt to read a bytes fails, the IOException is allowed to propagate upward. And subsequent IOException is caught and treated identically to an end of stream condition. Subclasses can (and should if possible) override this method to provide a more efficient implementation.


checkPos

protected void checkPos()
                 throws java.io.IOException

close

public void close()
           throws java.io.IOException
releases reference to RandomAccessRO, but does not closes it


available

public int available()
              throws java.io.IOException
Description copied from class: java.io.InputStream
This method returns the number of bytes that can be read from this stream before a read can block. A return of 0 indicates that blocking might (or might not) occur on the very next read attempt.

This method always returns 0 in this class


markSupported

public boolean markSupported()
Description copied from class: java.io.InputStream
This method returns a boolean that indicates whether the mark/reset methods are supported in this class. Those methods can be used to remember a specific point in the stream and reset the stream to that point.

This method always returns false in this class, but subclasses can override this method to return true if they support mark/reset functionality.


mark

public void mark(int i)
Description copied from class: java.io.InputStream
This method marks a position in the input to which the stream can be "reset" by calling the reset() method. The parameter @code{readlimit} is the number of bytes that can be read from the stream after setting the mark before the mark becomes invalid. For example, if mark() is called with a read limit of 10, then when 11 bytes of data are read from the stream before the reset() method is called, then the mark is invalid and the stream object instance is not required to remember the mark.

This method does nothing in this class, but subclasses may override it to provide mark/reset functionality.


reset

public void reset()
           throws java.io.IOException
Description copied from class: java.io.InputStream
This method resets a stream to the point where the mark() method was called. Any bytes that were read after the mark point was set will be re-read during subsequent reads.

This method always throws an IOException in this class, but subclasses can override this method if they provide mark/reset functionality.


skip

public long skip(long l)
          throws java.io.IOException
Description copied from class: java.io.InputStream
This method skips the specified number of bytes in the stream. It returns the actual number of bytes skipped, which may be less than the requested amount.

This method reads and discards bytes into a byte array until the specified number of bytes were skipped or until either the end of stream is reached or a read attempt returns a short count. Subclasses can override this metho to provide a more efficient implementation where one exists.