Initializes a new instance of this class.

Parameters:

channel		The file channel upon whose file this lock is held
position		The position within the file at which the locked region starts; must be non-negative
size		The size of the locked region; must be non-negative, and the sum position +  size must be non-negative
shared		true if this lock is shared, false if it is exclusive

Exceptions:

IllegalArgumentException

If the preconditions on the parameters do not hold