Interface IntervalIterator

    • Method Summary

      Modifier and Type Method Description
      int extent()
      Returns an approximation of a lower bound for the length of an interval returned by this iterator.
      void intervalTerms​(LongSet terms)
      Provides the set of terms that span the current interval.
      Interval nextInterval()
      Returns the next interval provided by this interval iterator, or null if no more intervals are available.
      IntervalIterator reset()
      Resets the internal state of this iterator for a new document.
    • Method Detail

      • reset

        IntervalIterator reset()
                        throws IOException
        Resets the internal state of this iterator for a new document.

        To reduce object creation, interval iterators are usually created in a lazy fashion by document iterator when they are needed. However, this implies that every time the document iterator is moved, some internal state of the interval iterator must be reset (e.g., because on the new document some of the component interval iterators are now IntervalIterators.TRUE). The semantics of this method is largely implementation dependent, with the important exception that the return value must be IntervalIterators.FALSE if the first call to nextInterval() will return null.

        Returns:
        IntervalIterators.FALSE if this interval iterator will return null at the first call to nextInterval(); this interval iterator, otherwise.
        Throws:
        IOException
      • extent

        int extent()
        Returns an approximation of a lower bound for the length of an interval returned by this iterator.
        Returns:
        an approximation of a lower bound for the length of an interval.
      • nextInterval

        Interval nextInterval()
                       throws IOException
        Returns the next interval provided by this interval iterator, or null if no more intervals are available.
        Returns:
        the next interval, or null if no more intervals are available.
        Throws:
        IOException
      • intervalTerms

        void intervalTerms​(LongSet terms)
        Provides the set of terms that span the current interval.

        For each interval returned by MG4J, there is a set of terms that caused the interval to be returned. The terms appear inside the interval, and certainly at its extremes.

        Note that the results of this method must be taken with a grain of salt: there might be different sets of terms causing the current interval, and only one will be returned.

        Parameters:
        terms - a set of integers that will be filled with the terms spanning the current interval.