Examples with Iter org.apache.jena.atlas.iterator.Iter used on opensource projects

Example 1 with Iter

use of org.apache.jena.atlas.iterator.Iter in project jena by apache.

the class PathLib method existsPath.

private static int existsPath(Graph graph, Node subject, Path path, final Node object, ExecutionContext execCxt) {
    if (!subject.isConcrete() || !object.isConcrete())
        throw new ARQInternalErrorException("Non concrete node for existsPath evaluation");
    Iterator<Node> iter = PathEval.eval(graph, subject, path, execCxt.getContext());
    Predicate<Node> filter = node -> Objects.equals(node, object);
    // See if we got to the node we're interested in finishing at.
    iter = Iter.filter(iter, filter);
    long x = Iter.count(iter);
    return (int) x;
}

Example 2 with Iter

use of org.apache.jena.atlas.iterator.Iter in project jena by apache.

the class BPlusTreeRewriter method writePackedDataBlocks.

// **** data block phase
/** Pack record blocks into linked RecordBufferPages */
private static Iterator<Pair<Integer, Record>> writePackedDataBlocks(Iterator<Record> records, final BPlusTree bpt) {
    if (debug) {
        divider();
        System.out.println("---- Data level");
    }
    final RecordBufferPageMgr mgr = bpt.getRecordsMgr().getRecordBufferPageMgr();
    Iterator<RecordBufferPage> iter = new RecordBufferPageLinker(new RecordBufferPagePacker(records, mgr));
    Function<RecordBufferPage, Pair<Integer, Record>> transform = rbp -> {
        mgr.put(rbp);
        Record r = rbp.getRecordBuffer().getHigh();
        r = bpt.getRecordFactory().createKeyOnly(r);
        return new Pair<>(rbp.getId(), r);
    };
    // Write and convert to split pairs.
    Iterator<Pair<Integer, Record>> iter2 = Iter.map(iter, transform);
    if (debug) {
        if (rebalance)
            System.out.println("Before rebalance (data)");
        iter2 = summarizeDataBlocks(iter2, bpt.getRecordsMgr().getRecordBufferPageMgr());
    //iter2 = printDataBlocks(iter2, bpt.getRecordsMgr().getRecordBufferPageMgr()) ;
    }
    if (rebalance)
        iter2 = new RebalenceDataEnd(iter2, bpt);
    // Testing - materialize - debug wil have done this
    if (materialize && !debug)
        iter2 = Iter.toList(iter2).iterator();
    if (debug && rebalance) {
        System.out.println("After rebalance (data)");
        iter2 = summarizeDataBlocks(iter2, bpt.getRecordsMgr().getRecordBufferPageMgr());
    //iter2 = printDataBlocks(iter2, bpt.getRecordsMgr().getRecordBufferPageMgr()) ;
    }
    return iter2;
}