author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 18 Aug 2010 10:53:26 +0300 | |
changeset 15 | cf5c74390b98 |
parent 10 | afe194b6b1cd |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#ifndef CPIX_CPIXSEARCH_H |
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#define CPIX_CPIXSEARCH_H |
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#include "cpixinit.h" |
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#include "cpixerror.h" |
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#include "cpixdoc.h" |
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#include "cpixanalyzer.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/** |
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** Internal (implementation detail) type, not useful in |
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** the public API. |
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*/ |
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typedef unsigned int IdxDbHndl; |
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/************************************************************************ |
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* Class cpix_Query |
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*/ |
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struct cpix_Query_ |
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{ |
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// pointer to native (CLucene) impl |
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void * ptr_; |
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// Last error, if any, that resulted from executing the |
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// last operation on this cpix_XXX object |
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// Use macros cpix_Failed, cpix_Succeeded and cpix_ClearError. |
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// Do not attempt releasing it. |
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cpix_Error * err_; |
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}; |
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typedef cpix_Query_ cpix_Query; |
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/** |
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* Destroys this query instance. Never fails. |
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*/ |
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void cpix_Query_destroy(cpix_Query * thisQuery); |
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/************************************************************************ |
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* Interface cpix_BoostMap |
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*/ |
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struct cpix_BoostMap_ |
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{ |
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// pointer to native (CLucene) impl |
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void * ptr_; |
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// Last error, if any, that resulted from executing the |
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// last operation on this cpix_XXX object |
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// Use macros cpix_Failed, cpix_Succeeded and cpix_ClearError. |
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// Do not attempt releasing it. |
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cpix_Error * err_; |
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}; |
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typedef cpix_BoostMap_ cpix_BoostMap; |
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/** |
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* Creates a boostmap (field name (wchar_t*) -> float values map). |
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* |
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* A boost map is a map to associated float values to a field |
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* name. Such associated value is used to boost the weight of a |
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* hit based on what field the term was found. |
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* |
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* @param result conveys error messages that may have arisen |
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*/ |
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cpix_BoostMap * |
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cpix_BoostMap_create(cpix_Result * result); |
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/** |
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* Puts a new fieldName - value pair to this boost map. |
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* |
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* @param thisMap this boost map to put the new associated to |
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* |
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* @param fieldName the name of the field |
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*/ |
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void cpix_BoostMap_put(cpix_BoostMap * thisMap, |
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const wchar_t * fieldName, |
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float boost); |
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/** |
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* Destroys this boost map instance. |
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* |
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* @param thisMap this boost map instance to destroy |
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*/ |
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void cpix_BoostMap_destroy(cpix_BoostMap * thisMap); |
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/************************************************************************ |
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* Interface cpix_QueryParser |
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*/ |
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struct cpix_QueryParser_ |
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{ |
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// pointer to native (CLucene) impl |
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void * ptr_; |
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// Last error, if any, that resulted from executing the |
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// last operation on this cpix_XXX object |
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// Use macros cpix_Failed, cpix_Succeeded and cpix_ClearError. |
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// Do not attempt releasing it. |
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cpix_Error * err_; |
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}; |
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typedef cpix_QueryParser_ cpix_QueryParser; |
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/** |
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* Constructs a cpix_QueryParser instance. |
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* |
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* @param fieldName the name of the field to search, must not be |
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* NULL, ownership not transferred. |
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* |
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* @param analyzer the analyzer to use, must not be NULL, |
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* ownership not transferred. |
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* |
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* @return new instance of query parser, ownership is transferred |
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* to the called. NULL is returned if creation failed for some |
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* reason - details are not given. |
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*/ |
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cpix_QueryParser * |
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cpix_QueryParser_create(cpix_Result * result, |
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const wchar_t * fieldName, |
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cpix_Analyzer * analyzer); |
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|
10
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|
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cpix_QueryParser * |
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cpix_CreatePrefixQueryParser(cpix_Result * result, |
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const wchar_t * fieldName); |
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|
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/** |
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* Constructs a special type of query parser, a multi-field query |
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* parser. For instance, specifying two fiels: 'title' and 'body' |
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* and giving a query string with two terms 'term1' and 'term2' |
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* will get you a query: |
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* |
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* '(title:term1 body:term1) (title:term2 body:term2)' |
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* |
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* Setting the default operator to AND will result in: |
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* |
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* '+(title:term1 body:term1) +(title:term2 body:term2)' |
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* |
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* meaning that all the terms must appear but it does not matter |
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* in what field they appear. |
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* |
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* @param result conveys error results |
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* |
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* @param fieldNames an array of field names to use, must not be |
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* NULL, and items in the array must not be NULL either. |
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* |
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* @param fieldCount the number of items in fieldNames |
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* |
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* @param analyzer the analyzer to use. Must not be NULL, no ownership |
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* transferred. |
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* |
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* @param boosts the weights for the different fields. There MUST |
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* be as many items in boosts many fields there are, and the |
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* boosting weights correspond to the fields of the same index |
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* position in the arrays. MUST NOT be NULL. |
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* |
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* @return a query parser that can do the special query |
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*/ |
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cpix_QueryParser * |
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cpix_CreateMultiFieldQueryParser(cpix_Result * result, |
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const wchar_t * fieldNames[], |
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cpix_Analyzer * analyzer, |
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cpix_BoostMap * boosts); |
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|
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/** |
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* The default operator on a query parser - how to interpret |
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* enumerations of terms - are they OR-ed or AND-ed? |
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*/ |
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enum cpix_QP_Operator_ |
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{ |
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cpix_QP_OR_OPERATOR = 0, |
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cpix_QP_AND_OPERATOR = 1 |
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}; |
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typedef cpix_QP_Operator_ cpix_QP_Operator; |
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|
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|
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/** |
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* Sets the default operator on this query parser. The default |
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* operator (OR or AND) can be left out from query |
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* strings. E.g. if default operator is OR then query string "foo |
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* bar" means "foo OR bar". |
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* |
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* @param thisQueryParser the query parser to set the default |
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* operator of |
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* |
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* @param op the operator to set as default operator to use. |
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*/ |
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void |
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cpix_QueryParser_setDefaultOperator(cpix_QueryParser * thisQueryParser, |
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cpix_QP_Operator op); |
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|
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|
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// TODO declare and implement |
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// cpix_QueryParser_getDefaultOperator() - when/if needed |
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|
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|
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/** |
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* Parses the query string and creates a query object |
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* out of it. |
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* |
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* @param thisQueryParser the query parser that should |
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* parse |
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* |
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* @param queryStr the query string to parse, must not be NULL, |
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* ownership not transferred. A single wildcard character |
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* will create a query that will dump the actual content of |
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* the index, so be careful (in this case the name of the |
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* field given to this query parser does not matter). |
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* |
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* @return NULL or a new Query object, ownership is transferred |
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* to the owner. NULL is returned if the operation failed or |
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* if the operation succeeded, but the query was considered 'useless'. |
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* Query e.g. may be reduced to empty string by the stop word filter. |
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* In this situation in any case, searching with the query would produce |
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* zero hits. |
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*/ |
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cpix_Query * |
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cpix_QueryParser_parse(cpix_QueryParser * thisQueryParser, |
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const wchar_t * queryStr); |
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|
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/** |
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* Destroys this query parser instance. Never fails. |
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*/ |
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void cpix_QueryParser_destroy(cpix_QueryParser * thisQueryParser); |
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|
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|
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/************************************************************************ |
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* Class cpix_Hits |
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*/ |
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struct cpix_Hits_ |
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{ |
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// pointer to native (CLucene) impl |
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void * ptr_; |
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|
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// Last error, if any, that resulted from executing the |
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// last operation on this cpix_XXX object |
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// Use macros cpix_Failed, cpix_Succeeded and cpix_ClearError. |
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// Do not attempt releasing it. |
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cpix_Error * err_; |
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}; |
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|
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typedef cpix_Hits_ cpix_Hits; |
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|
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/** |
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* @return the total number of available hits in this set - |
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* snapshot taken at the time of the hits construction. |
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* |
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* NOTE While fetching documents may force recommitting the query |
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* if the underlying database have changed, asking for its length |
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* will never recommit. |
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*/ |
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int32_t cpix_Hits_length(cpix_Hits * thisHits); |
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|
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|
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/** |
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* Gets the nth document in this set. May fail. |
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* |
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* @param thisHits this Hits instance to use |
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* |
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* @param index the index of the document to get. |
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* |
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* @param target to put the field to. NOTE no new native instance |
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* is created for the target, and therefore cpix_Document_destroy |
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* must NOT be called on it. The instance 'target' is best to have |
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* as a local variable (on the stack). See description of lifetime |
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* management in the beginning of this header. May fail. |
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*/ |
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void cpix_Hits_doc(cpix_Hits * thisHits, |
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int32_t index, |
15
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cpix_Document ** target, |
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int32_t count); |
0
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|
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|
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|
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/** OBS |
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* A hits collection may be invalidated whenever the underlying |
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* index manipulator changes substantially. That means, that |
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* cpix_Hits_length and cpix_Hits_doc may fail at any point for no |
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* apparent reasons. This function can test if a hits collection |
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* is still valid. Note, that even if it is valid, it may not be |
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* by the time you call your next operation on it. If it is |
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* invalid, then there is only one thing you can do with it: call |
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* cpix_Hits_destroy on it. |
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* |
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* |
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* @param thisHits this hits collection |
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* |
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* @returns true (1) if it is still valid, and false (0) |
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* otherwise. This call never fails. |
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* / |
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int cpix_Hits_isValid(cpix_Hits * thisHits); |
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*/ |
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|
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|
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/** |
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* Destroys this hits instance. Never fails. |
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* |
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*/ |
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void cpix_Hits_destroy(cpix_Hits * thisHits); |
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/** |
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* cpix_IdxDb |
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*/ |
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struct cpix_IdxSearcher_ |
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{ |
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// instead of a pointer to native (CLucene) impl, there is a |
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// handle here only. The type here must be equivalent to |
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IdxDbHndl handle_; |
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|
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// Last error, if any, that resulted from executing the |
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// last operation on this cpix_XXX object |
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// Use macros cpix_Failed, cpix_Succeeded and cpix_ClearError. |
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// Do not attempt releasing it. |
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cpix_Error * err_; |
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}; |
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typedef cpix_IdxSearcher_ cpix_IdxSearcher; |
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|
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|
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|
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|
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/** |
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* Creates a cpix_IdxDb instance through which a client can search |
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* the index database responsible for a given base app |
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* class. |
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* Search can involve multiple on disk index databases. |
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* |
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* @param result pointer through which error details are |
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* communicated back |
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* |
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* @param domainSelector a string that is non-empty, a comma |
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* (',') separated list of appclasses. Appclasses can be |
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* (unqualified) base app classes too, and qualified base app |
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* classes as well. |
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* |
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* @retur pointer to the cpix_IdxDb instance that can be used for |
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* searching and modifying the index. |
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*/ |
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cpix_IdxSearcher * cpix_IdxSearcher_openDb(cpix_Result * result, |
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const char * domainSelector); |
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|
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|
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/** |
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* Releases the native index database manipulator (from the caller |
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* client). (Actually, it only decreases its reference count, as |
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* index database manipulator is kept around for performance as |
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* long as it is needed.) It also frees up the wrapper. |
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*/ |
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void cpix_IdxSearcher_releaseDb(cpix_IdxSearcher * thisIdxSearcher); |
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|
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|
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/** |
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* Searches the index. |
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* |
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* NOTE: Keep the original query parser and query instances alive |
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* as long as you use the result of the search - in general, they |
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* may be needed. |
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* |
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* @param thisIdxDb the index db instance that should |
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* perform the search, must not be NULL. |
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* |
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* @param query the query itself in a structured form, must not be |
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* NULL, its ownership does not change. |
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* |
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* @return the hits instance with the search results, that will be |
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* owned by the calling client. |
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*/ |
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cpix_Hits * |
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cpix_IdxSearcher_search(cpix_IdxSearcher * thisIdxSearcher, |
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cpix_Query * query); |
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|
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|
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401 |
|
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|
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|
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif /* __cplusplus */ |
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|
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|
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#endif /* CPIX_CPIXSEARCH_H */ |