src_other/tuplebase/ZTQLEngine.h

00001 /*  @(#) $Id: $ */
00002 
00003 /* ------------------------------------------------------------
00004 Copyright (c) 2007 Andrew Green and Learning in Motion, Inc.
00005 http://www.zoolib.org
00006 
00007 Permission is hereby granted, free of charge, to any person obtaining a copy
00008 of this software and associated documentation files (the "Software"), to deal
00009 in the Software without restriction, including without limitation the rights
00010 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00011 copies of the Software, and to permit persons to whom the Software is
00012 furnished to do so, subject to the following conditions:
00013 
00014 The above copyright notice and this permission notice shall be included in
00015 all copies or substantial portions of the Software.
00016 
00017 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00018 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00019 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00020 COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
00021 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
00022 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00023 ------------------------------------------------------------ */
00024 
00025 #ifndef __ZTQLEngine__
00026 #define __ZTQLEngine__ 1
00027 #include "zconfig.h"
00028 
00029 #include "ZTQL.h"
00030 
00031 // =================================================================================================
00032 #pragma mark -
00033 #pragma mark * ZTQLEngine
00034 
00035 class ZTQLEngine
00036         {
00037 public:
00038         class Iterator
00039                 {
00040         protected:
00041                 Iterator();
00042 
00043         public:
00044                 virtual ~Iterator();
00045 
00046                 virtual bool HasValue() = 0;
00047                 virtual ZTuple Current() = 0;
00048                 virtual void Advance() = 0;
00049                 };
00050 
00051 
00052         ZTQLEngine();
00053 
00054         void Execute(ZTQL::Query iQuery, vector<ZTuple>& oResults);
00055 
00056         virtual Iterator* Search();//ZTSpec::CriterionSect iSect);
00057 
00058 
00059 //              const ZTSpec& iTSpec, std::vector<std::pair<uint64, ZTuple> >& oResults) = 0;
00060 
00061 private:        
00062         void pExecute(ZRef<ZTQL::Node> iNode, vector<ZTuple>& oResults);
00063         };
00064 
00065 #endif // __ZTQLEngine__

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