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use ::theban_interval_tree::RangePairIter;
use ::memrange::Range;

use content::Bitmap;
use content::BitmapSlice;

pub struct BitmapSliceIter<'a> {
    orig: RangePairIter<'a, Bitmap>,
    orig_rng: Range,
}

impl<'a> BitmapSliceIter<'a> {
    pub fn new(orig: RangePairIter<Bitmap>, rng: Range) -> BitmapSliceIter {
        return BitmapSliceIter{orig: orig, orig_rng: rng};
    }

    pub fn get_range(&self) -> Range {
        return self.orig_rng;
    }
}

impl<'a> Iterator for BitmapSliceIter<'a> {

    type Item = (Range,BitmapSlice<'a>);

    fn next(&mut self) -> Option<(Range,BitmapSlice<'a>)> {
        if let Some(n) =  self.orig.get_next_node() {
            return Some(( n.key.get_intersection(&self.orig_rng), n.data.to_subslice(n.key, self.orig_rng)) )
        }
        return None
    }
}