1 | /**********************************************************************
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2 | *
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3 | * mgsearch.h -- implementation of search for old versions of mg
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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 MGSEARCH_H
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28 | #define MGSEARCH_H
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29 |
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30 |
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31 | #include "search.h"
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32 |
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33 | class mgsearchclass : public searchclass {
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34 | public:
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35 | mgsearchclass ();
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36 | virtual ~mgsearchclass ();
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37 |
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38 | virtual text_t get_textindex_type() {return "mg";}
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39 |
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40 | // you only need to use this function before doing any stemming
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41 | // casefolding and stemming will be set if values for them are
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42 | // provided (0 or 1).
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43 | // makeindexcurrent returns true if it was able to load the database
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44 | bool makeindexcurrent (const text_t &index, const text_t &subcollection,
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45 | const text_t &language, const text_t &collection,
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46 | int casefolding = -1, int stemming = -1);
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47 |
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48 | // stem word uses the values set in the last call to makeindexcurrent
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49 | // to stem the word. It is assumed that word is in unicode
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50 | text_t stemword (const text_t &word);
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51 | text_t stemword (text_t::const_iterator here, text_t::const_iterator end);
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52 |
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53 | // the search results are returned in queryresults
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54 | // search returns 'true' if it was able to do a search
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55 | bool search(const queryparamclass &queryparams,
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56 | queryresultsclass &queryresults);
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57 |
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58 | // the document text for 'docnum' is placed in 'output'
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59 | // docTargetDocument returns 'true' if it was able to
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60 | // try to get a document
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61 | // collection is needed to see if an index from the
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62 | // collection is loaded. If no index has been loaded
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63 | // defaultindex is needed to load one
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64 | bool docTargetDocument(const text_t &defaultindex,
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65 | const text_t &defaultsubcollection,
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66 | const text_t &defaultlanguage,
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67 | const text_t &collection,
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68 | int docnum,
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69 | text_t &output);
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70 |
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71 | // same as docTargetDocument except the document is returned
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72 | // in its raw form. UDoc remains the property of mg and may
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73 | // be destroyed on the next call to mg.
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74 | bool mgdocument (const text_t &defaultindex,
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75 | const text_t &defaultsubcollection,
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76 | const text_t &defaultlanguage,
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77 | const text_t &collection,
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78 | int docnum,
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79 | char *&UDoc, int &ULen);
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80 |
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81 | // unload_database simply calls mgq's close_all_databases function to
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82 | // clear any cached databases - this is useful when attempting to
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83 | // completely remove all trace of a collectionserver at runtime (when
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84 | // using a persistent version of Greenstone like the windows local
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85 | // library)
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86 | void unload_database ();
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87 |
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88 |
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89 | protected:
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90 |
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91 | void setsearchmode (const queryparamclass &queryparams);
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92 | void submitquery (const queryparamclass &queryparams);
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93 | void getresults (const queryparamclass &queryparams, queryresultsclass &queryresults);
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94 |
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95 | virtual void filterquery (text_t &ttquerystring);
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96 | };
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97 |
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98 |
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99 | #endif
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