| 1 | /**********************************************************************
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| 2 | *
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| 3 | * search.h -- abstract search class for mg systems
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| 4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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| 5 | *
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| 6 | * A component of the Greenstone digital library software
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| 7 | * from the New Zealand Digital Library Project at the
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| 8 | * University of Waikato, New Zealand.
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| 9 | *
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| 10 | * This program is free software; you can redistribute it and/or modify
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| 11 | * it under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; either version 2 of the License, or
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| 13 | * (at your option) any later version.
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| 14 | *
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| 15 | * This program is distributed in the hope that it will be useful,
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | * GNU General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU General Public License
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| 21 | * along with this program; if not, write to the Free Software
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| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | *
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| 24 | *********************************************************************/
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| 25 |
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| 26 |
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| 27 | #ifndef SEARCH_H
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| 28 | #define SEARCH_H
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| 29 |
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| 30 | #include "text_t.h"
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| 31 | #include "querycache.h"
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| 32 |
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| 33 | #define RESULTCACHESIZE 10
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| 34 | #define MAXNUMDOCS 1000000
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| 35 | #define MAXNUMTERMS 100
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| 36 |
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| 37 | class searchclass {
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| 38 | public:
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| 39 | searchclass ();
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| 40 | virtual ~searchclass ();
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| 41 |
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| 42 | // in subclass, should be over-rided to return "mg" or "mgpp"
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| 43 | virtual text_t get_textindex_type()=0;
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| 44 | // the index directory must be set before any searching
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| 45 | // is done
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| 46 | virtual void setcollectdir (const text_t &thecollectdir);
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| 47 |
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| 48 | // the search results are returned in queryresults
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| 49 | // search returns 'true' if it was able to do a search
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| 50 | virtual bool search(const queryparamclass &queryparams,
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| 51 | queryresultsclass &queryresults)=0;
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| 52 |
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| 53 | // the document text for 'docnum' is placed in 'output'
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| 54 | // docTargetDocument returns 'true' if it was able to
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| 55 | // try to get a document
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| 56 | // collection is needed to see if an index from the
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| 57 | // collection is loaded. If no index has been loaded
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| 58 | // defaultindex is needed to load one
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| 59 | virtual bool docTargetDocument(const text_t &defaultindex,
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| 60 | const text_t &defaultsubcollection,
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| 61 | const text_t &defaultlanguage,
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| 62 | const text_t &collection,
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| 63 | int docnum,
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| 64 | text_t &output)=0;
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| 65 |
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| 66 | // unload_database clears any cached databases -
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| 67 | // this is useful when attempting to
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| 68 | // completely remove all trace of a collectionserver at runtime (when
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| 69 | // using a persistent version of Greenstone like the windows local
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| 70 | // library)
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| 71 | virtual void unload_database ()=0;
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| 72 |
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| 73 | protected:
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| 74 | querycache *cache;
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| 75 | text_t collectdir; // the collection directory
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| 76 |
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| 77 | };
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| 78 |
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| 79 |
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| 80 | #endif
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