1 | /*
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2 | * MGPPSearchWrapper.java
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3 | * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
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4 | *
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5 | * This program is free software; you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation; either version 2 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 | */
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19 | package org.greenstone.mgpp;
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20 |
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21 | import java.util.Vector;
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22 |
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23 | /** java wrapper class for access to mgpp in C++
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24 | *
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25 | * the native side implemented in MGPPWrapperImpl.cpp
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26 | * uses MGPPQueryResult to hold the result of a query. the
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27 | * result of a getDocument is a String
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28 | * uses the jni
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29 | *
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30 | *@see MGPPQueryResult
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31 | */
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32 | public class MGPPSearchWrapper {
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33 |
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34 | /** the query result
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35 | * will be filled in by runQuery
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36 | */
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37 | protected MGPPQueryResult mgpp_query_result_=null;
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38 | /** pointer to c++ MGPPWrapperData class - cached indexData and queryInfo
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39 | */
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40 | protected long mgpp_data_ptr_=0;
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41 |
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42 | static {
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43 | System.loadLibrary("mgppsearchjni");
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44 | initIDs();
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45 | }
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46 |
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47 | public MGPPSearchWrapper() {
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48 | mgpp_query_result_ = new MGPPQueryResult();
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49 | initCppSide();
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50 | }
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51 |
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52 | /** initialises field and method IDs for java side to enable access on
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53 | C++ side */
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54 | private static native void initIDs();
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55 |
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56 | /** initialises the mgpp_data_ptr_ */
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57 | private native boolean initCppSide();
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58 |
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59 | /** returns a document: number docnum at level level
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60 | * text_path path should provide
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61 | * the absolute location of the mgpp text files eg ..../index/text/demo
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62 | * returns the doc in utf-8
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63 | */
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64 | //only this method is for search purpose
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65 | // public native String getDocument(String text_path,
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66 | // String level,
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67 | // long docnum );
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68 |
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69 | /** the public method - converts between utf-8 and unicode
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70 | */
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71 | // public String getDocument(String text_path,
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72 | // String level,
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73 | // long docnum ) {
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74 |
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75 | //String utf8_doc = getUtF8Document(base_dir, text_path, level, docnum);
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76 |
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77 | /** load up the data structure for index
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78 | * - maintains state between requests as can be slow
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79 | * index_path should provide
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80 | * the absolute location of the mgpp index files eg ..../index/tt/demo
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81 | */
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82 | public native boolean loadIndexData(String index_path);
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83 | /** unloads the data */
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84 | public native boolean unloadIndexData();
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85 |
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86 | // query param methods
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87 |
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88 | /** if on=true, sets default stemming on - its off by default*/
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89 | public native void setStem(boolean on);
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90 |
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91 | /** if on=true, sets default accentfolding on - its off by default*/
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92 | public native void setAccentFold(boolean on);
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93 |
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94 | /** if on=true, sets default casefolding on - its off by default */
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95 | public native void setCase(boolean on);
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96 | /** default is 50 */
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97 | public native void setMaxDocs(int num);
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98 | /** if on=true, sorts by rank, otherwise returns in build order -
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99 | default is on */
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100 | public native void setSortByRank(boolean on);
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101 | /** if on=true, a query returns term freq info - default is on */
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102 | public native void setReturnTerms(boolean on);
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103 | /** sets the granularity of the query - default 'Document' */
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104 | public native void setQueryLevel(String level);
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105 | /** sets the granularity of the result - default 'Document' */
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106 | public native void setReturnLevel(String level);
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107 | /** sets the default boolean operator - AND(=1)/OR(=0) */
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108 | public native void setMatchMode(int mode);
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109 |
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110 | /** sets maxnumeric */
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111 | public native void setMaxNumeric(int maxnumeric);
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112 | /** returns a string with all the current query param settings */
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113 | public native String getQueryParams();
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114 |
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115 | /** actually carry out the query. Use the set methods to set any query
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116 | params
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117 | * writes the result to query_result
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118 | */
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119 | public native void runQuery(String query_string);
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120 |
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121 | /** get the result out of the wrapper */
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122 | public MGPPQueryResult getQueryResult() {
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123 | return mgpp_query_result_;
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124 | }
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125 |
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126 | }
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