Package it.unimi.di.big.mg4j.search

Class OrderedAndDocumentIterator.OrderedAndIntervalIterator

    • Constructor Detail

      • OrderedAndIntervalIterator

        protected OrderedAndIntervalIterator​(int n)

    • Method Detail

      • reset

        public IntervalIterator reset()
                       throws IOException
        Description copied from interface: IntervalIterator
        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 IntervalIterator.nextInterval() will return null.

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

      • intervalTerms

        public void intervalTerms​(LongSet terms)
        Description copied from interface: IntervalIterator
        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.

      • nextInterval

        public Interval nextInterval()
                      throws IOException
        Description copied from interface: IntervalIterator
        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

      • extent

        public int extent()
        Description copied from interface: IntervalIterator
        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.