Examples with Pair org.apache.jena.atlas.lib.Pair used on opensource projects

Example 16 with Pair

use of org.apache.jena.atlas.lib.Pair in project jena by apache.

the class TransformFilterImplicitJoin method apply.

private static Op apply(ExprList exprs, Op subOp) {
    // ---- Find and extract any implicit join filters.
    Pair<List<Pair<Var, Var>>, ExprList> p = preprocessFilterImplicitJoin(subOp, exprs);
    if (p == null || p.getLeft().size() == 0)
        return null;
    List<Pair<Var, Var>> joins = p.getLeft();
    Collection<Var> varsMentioned = varsMentionedInImplictJoins(joins);
    ExprList remaining = p.getRight();
    // enhancement to this optimizer
    if (varsMentioned.size() != joins.size() * 2)
        return null;
    // ---- Check if the subOp is the right shape to transform.
    Op op = subOp;
    // hence eliminate all rows. Return the empty table.
    if (testSpecialCaseUnused(subOp, joins, remaining))
        return OpTable.empty();
    // This is { OPTIONAL{P1} OPTIONAL{P2} ... FILTER(?x = :x) }
    if (testSpecialCaseOptional(subOp, joins, remaining)) {
        // Find backbone of ops
        List<Op> ops = extractOptionals(subOp);
        ops = processSpecialCaseOptional(ops, joins);
        // Put back together
        op = rebuild((Op2) subOp, ops);
        // Put all filters - either we optimized, or we left alone.
        // Either way, the complete set of filter expressions.
        op = OpFilter.filterBy(exprs, op);
        return op;
    }
    // Special case : filter is over a union where one/both sides are always false
    if (testSpecialCaseUnion(subOp, joins)) {
        // This will attempt to eliminate the sides that are always false
        op = processSpecialCaseUnion(subOp, joins);
        // operator at this point and can return immediately
        if (op instanceof OpTable)
            return op;
    }
    if (!safeToTransform(joins, varsMentioned, op))
        return null;
    for (Pair<Var, Var> implicitJoin : joins) {
        // TODO Where there are multiple conditions it may be necessary to
        // apply the substitutions more intelligently
        op = processFilterWorker(op, implicitJoin.getLeft(), implicitJoin.getRight());
    }
    // ---- Place any filter expressions around the processed sub op.
    if (remaining.size() > 0)
        op = OpFilter.filterBy(remaining, op);
    return op;
}

Example 17 with Pair

use of org.apache.jena.atlas.lib.Pair in project jena by apache.

the class TransformFilterInequality method preprocessFilterInequality.

// --- find and extract
private static Pair<List<Pair<Var, NodeValue>>, ExprList> preprocessFilterInequality(ExprList exprs) {
    List<Pair<Var, NodeValue>> exprsFilterInequality = new ArrayList<>();
    ExprList exprsOther = new ExprList();
    for (Expr e : exprs.getList()) {
        Pair<Var, NodeValue> p = preprocess(e);
        if (p != null)
            exprsFilterInequality.add(p);
        else
            exprsOther.add(e);
    }
    if (exprsFilterInequality.size() == 0)
        return null;
    return Pair.create(exprsFilterInequality, exprsOther);
}

Example 18 with Pair

use of org.apache.jena.atlas.lib.Pair in project jena by apache.

the class ObjectFileTrans method append.

/** Copy from the temporary file to the real file */
private void append() {
    // We could write directly to the real file if:
    //    we record the truncate point needed for an abort
    //    manage partial final writes
    //    deny the existence of nodes after the transaction mark.
    // Later - stay simple for now.
    // Truncate/position the ObjectFile.
    base.reposition(otherAllocOffset);
    Iterator<Pair<Long, ByteBuffer>> iter = transObjects.all();
    for (; iter.hasNext(); ) {
        Pair<Long, ByteBuffer> p = iter.next();
        String s = StrUtils.fromUTF8bytes(p.getRight().array());
        long x = base.write(p.getRight());
        if (p.getLeft() + otherAllocOffset != x)
            throw new FileException("Expected id of " + (p.getLeft() + otherAllocOffset) + ", got an id of " + x);
    }
}

Example 19 with Pair

use of org.apache.jena.atlas.lib.Pair in project jena by apache.

the class NodeTableTrans method dump.

// Debugging only
private void dump() {
    System.err.println(">>>>>>>>>>");
    System.err.println("label = " + label);
    System.err.println("txn = " + txn);
    System.err.println("offset = " + allocOffset);
    System.err.println("journalStartOffset = " + journalObjFileStartOffset);
    System.err.println("journal = " + journalObjFile.getLabel());
    if (true)
        return;
    System.err.println("nodeTableJournal >>>");
    Iterator<Pair<NodeId, Node>> iter = nodeTableJournal.all();
    for (; iter.hasNext(); ) {
        Pair<NodeId, Node> x = iter.next();
        NodeId nodeId = x.getLeft();
        Node node = x.getRight();
        NodeId mapped = mapFromJournal(nodeId);
        //debug("append: %s -> %s", x, mapFromJournal(nodeId)) ;
        // This does the write.
        NodeId nodeId2 = base.getAllocateNodeId(node);
        System.err.println(x + "  mapped=" + mapped + " getAlloc=" + nodeId2);
    }
    System.err.println("journal >>>");
    Iterator<Pair<Long, ByteBuffer>> iter1 = this.journalObjFile.all();
    for (; iter1.hasNext(); ) {
        Pair<Long, ByteBuffer> p = iter1.next();
        System.err.println(p.getLeft() + " : " + p.getRight());
        ByteBufferLib.print(System.err, p.getRight());
    }
    System.err.println("nodeIndex >>>");
    Iterator<Record> iter2 = this.nodeIndex.iterator();
    for (; iter2.hasNext(); ) {
        Record r = iter2.next();
        System.err.println(r);
    }
    System.err.println("<<<<<<<<<<");
}