C++ (Cpp) fs_backend_get_ptree Examples

Example #1

File: query-backend.c Project: ncbo/4store

static fs_ptree_it *fs_backend_get_matches(fs_backend *be, fs_rid quad[4], int flags)
{
    fs_ptree *pt = NULL;
    fs_rid pk;
    fs_rid pair[2];

    if (flags & FS_BIND_BY_SUBJECT) {
	pt = fs_backend_get_ptree(be, quad[2], 0);
	pk = quad[1];
	pair[0] = quad[0];
	pair[1] = quad[3];
    } else {
	pt = fs_backend_get_ptree(be, quad[2], 1);
	pk = quad[3];
	pair[0] = quad[0];
	pair[1] = quad[1];
    }

    if (!pt) return NULL;

    return fs_ptree_search(pt, pk, pair);
}

Example #2

File: tbchain.c Project: 66laps/4store

int fs_tbchain_it_next(fs_tbchain_it *it, fs_rid triple[3])
{
    if (!it) {
        fs_error(LOG_ERR, "fs_tbchain_it_next() passed NULL iterator");

        return 0;
    }

    while (1) {
        if (it->node == 0) {
            triple[0] = FS_RID_NULL;
            triple[1] = FS_RID_NULL;
            triple[2] = FS_RID_NULL;
            if (it->superset) {
                fs_tbchain_clear_bit(it->tbc, it->chain, FS_TBCHAIN_SUPERSET);
            }

            return 0;
        } else if (it->node == 1) {
            fs_error(LOG_CRIT, "iterator ended up at B1");
            triple[0] = FS_RID_NULL;
            triple[1] = FS_RID_NULL;
            triple[2] = FS_RID_NULL;

            return 0;
        } else if (it->pos >= it->tbc->data[it->node].length) {
            it->node = it->tbc->data[it->node].cont;
            it->pos = 0;
        } else if (it->tbc->data[it->node].data[it->pos][0] == FS_RID_GONE) {
            (it->pos)++;
        } else {
            int ok = 1;
            triple[0] = it->tbc->data[it->node].data[it->pos][0];
            triple[1] = it->tbc->data[it->node].data[it->pos][1];
            triple[2] = it->tbc->data[it->node].data[it->pos][2];

            if (it->superset) {
                if (it->tbc->be) {
                    fs_ptree *pt = fs_backend_get_ptree(it->tbc->be, triple[1], 0);
                    fs_rid pair[2] = { it->model, triple[2] };
                    fs_ptree_it *pit = fs_ptree_search(pt, triple[0], pair);
                    if (pit) {
                        fs_rid dummy[2];
                        if (!fs_ptree_it_next(pit, dummy)) {
                            ok = 0;
                        }
                        fs_ptree_it_free(pit);
                    } else {
                        ok = 0;
                    }
                } else {
                    fs_error(LOG_ERR, "backend pointer missing from tbchain, "
                             "returning superset of results");
                }
            }

            if (ok) {
                (it->pos)++;

                return 1;
            } else {
                it->tbc->data[it->node].data[it->pos][0] = FS_RID_GONE;
                fs_tbchain_set_bit(it->tbc, it->chain, FS_TBCHAIN_SPARSE);
                (it->pos)++;
            }
        }
    }
}