98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
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/*
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1.1.1 Class Implementation
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----
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This file is part of SECONDO.
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Copyright (C) 2017,
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Faculty of Mathematics and Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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*/
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#include "Algebras/DBService2/SecondoNodeAdapter.hpp"
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using namespace std;
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extern NestedList* nl;
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// extern boost::recursive_mutex nlparsemtx;
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namespace DBService
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{
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shared_ptr<Node> SecondoNodeAdapter::buildObjectFromNestedList(
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string database, ListExpr recordAsNestedList, int offset) {
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/*
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TODO This is similar to the type mapping problem in Algebras.
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Converting nested lists into data structures.
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In this example these pieces of information come together:
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- A record attributed such as Node host, port, ...
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- The C++ data type of the attribute e.g. string, int, ..
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- The Secondo data type, e.g. Text, String, Int, ...
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- The position in the nested list, e.g. Nth(1), Nth(2), ...
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Question:
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Is there a way to express this mapping generically based on a
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mapping?
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Here in pseudo JSON notation:
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{
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member_class: Node
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member_name: "host",
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member_type: "string",
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secondo_type: "Text",
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position_in_nested_list: 1
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}
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*/
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// The lock must be acquired in the invoking function,
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// e.g. SecondoRecordAdapter.
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//boost::lock_guard<boost::recursive_mutex> guard(nlparsemtx);
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// Example of a record as nested list:
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// ('localhost' 1245 '' '/home/doesnt_exist/secondo' 9941 9942 1)
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string host = nl->TextValue(nl->Nth(offset + 1, recordAsNestedList));
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int port = nl->IntValue(nl->Nth(offset + 2, recordAsNestedList));
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string config = nl->TextValue(nl->Nth(offset + 3, recordAsNestedList));
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string diskPath = nl->TextValue(nl->Nth(offset + 4, recordAsNestedList));
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int comPort = nl->IntValue(nl->Nth(offset + 5, recordAsNestedList));
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int transferPort = nl->IntValue(nl->Nth(offset + 6, recordAsNestedList));
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string type = nl->StringValue(nl->Nth(offset + 7, recordAsNestedList));
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// Due to the appended "addid" operator, the id is always the
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// last item in the list
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int recordId = nl->IntValue(nl->Nth(offset + 8, recordAsNestedList));
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//TODO There is no way to set the id in the contructor. Fix it.
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shared_ptr<Node> node = make_shared<Node>(host, port, config, diskPath,
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comPort, transferPort);
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node->setId(recordId);
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node->setType(type);
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node->setDatabase(database);
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node->setClean();
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node->setNotNew();
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return node;
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}
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}
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