1 | /*
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2 | * MGPPSearchWrapperImpl.cpp
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3 | * Copyright (C) 2007 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 | #ifdef __WIN32__
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20 | #include <win32cfg.h>
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21 | #include <strstream>
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22 | #include <sstream>
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23 | #else
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24 | #ifdef __APPLE__
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25 | #include <strstream>
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26 | #include <sstream>
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27 | #else
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28 | #include <sstream>
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29 | #endif
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30 | #endif
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31 |
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32 | #include <jni.h>
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33 | #include "org_greenstone_mgpp_MGPPSearchWrapper.h"
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34 | #include "MGPPSearchWrapperImpl.h"
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35 | #include "GSDLQueryParser.h"
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36 | #include "MGQuery.h"
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37 |
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38 | MGPPSearchData::MGPPSearchData() {
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39 | indexData = new IndexData();
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40 | queryInfo = new QueryInfo();
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41 |
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42 | if (queryInfo==NULL) {
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43 | cerr<<"couldn't allocate new query info\n";
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44 | if (indexData!=NULL) {
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45 | delete indexData;
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46 | }
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47 | }
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48 |
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49 | // set all the default params
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50 | SetCStr(queryInfo->docLevel, "Document"); // the level to search at
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51 | queryInfo->maxDocs = 50;
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52 | queryInfo->sortByRank = true;
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53 | queryInfo->exactWeights = false;
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54 | queryInfo->needRankInfo = true;
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55 | queryInfo->needTermFreqs = true;
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56 |
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57 | UCArrayClear(level);
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58 | SetCStr(level, "Document"); // the level to return docs at
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59 | defaultStemMethod=0;
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60 | defaultBoolCombine=0;
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61 | maxNumeric = 4;
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62 | }
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63 |
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64 | MGPPSearchData::~MGPPSearchData() {
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65 | if (indexData !=NULL) {
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66 | delete indexData;
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67 | }
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68 | if (queryInfo !=NULL) {
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69 | delete queryInfo;
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70 | }
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71 | }
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72 |
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73 | // ********************************************
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74 | // initialisation stuff
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75 | // ********************************************
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76 |
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77 | // cached ids for java stuff
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78 | jfieldID FID_mgpp_data = NULL; // MGPPSearchData
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79 | jfieldID FID_query_result = NULL; // MGPPQueryResult
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80 | jmethodID MID_addDoc=NULL; // MGPPQueryResult.addDoc()
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81 | jmethodID MID_addTerm=NULL; // MGPPQueryResult.addTerm()
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82 | jmethodID MID_setTotalDocs=NULL; // MGPPQueryResult.setTotalDocs()
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83 | jmethodID MID_clearResult=NULL; //MGPPQueryResult.clear()
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84 | jmethodID MID_setSyntaxError=NULL; // MGPPQueryResult.setSyntaxError()
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85 | jclass CID_String=NULL; // class ID of String
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86 |
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87 | /* to access objects and methods on java side, need their field/method ids -
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88 | this initialises them at the start to avoid recalculating them each time they
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89 | are needed
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90 | Note: the descriptors need to be exactly right, otherwise you get an error
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91 | saying "no such field" but no reference to the fact that it has the right
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92 | name but the wrong type.
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93 | Note: apparently the jclass is a local ref and should only work
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94 | in the method that created it. It seems to work ok, but I'll make it
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95 | global cos the book said I should, and it may avoid future hassles.
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96 | */
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97 | JNIEXPORT void JNICALL
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98 | Java_org_greenstone_mgpp_MGPPSearchWrapper_initIDs (JNIEnv *j_env, jclass j_cls) {
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99 |
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100 | FID_mgpp_data = j_env->GetFieldID(j_cls, "mgpp_data_ptr_", "J"); //a long-"J"
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101 | if (FID_mgpp_data==NULL) {
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102 | cerr <<"MGPP JNI: field mgpp_data_ptr_ not found"<<endl;
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103 | }
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104 |
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105 | FID_query_result = j_env->GetFieldID(j_cls, "mgpp_query_result_", "Lorg/greenstone/mgpp/MGPPQueryResult;"); // an object -"L<class name>;"
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106 | if (FID_query_result==NULL) {
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107 | cerr <<"MGPP JNI: field mgpp_query_result_ not found"<<endl;
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108 | }
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109 | // the methods we want to use
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110 |
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111 | // addDoc(long doc, float rank)
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112 | jclass JC_MGPPQueryResult = j_env->FindClass("org/greenstone/mgpp/MGPPQueryResult");
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113 | MID_addDoc = j_env->GetMethodID(JC_MGPPQueryResult, "addDoc", "(JF)V");
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114 | if (MID_addDoc==NULL) {
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115 | cerr <<"MGPP JNI: addDoc method not found"<<endl;
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116 | }
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117 | // addTerm(String term, String tag, int stem_method, long match_docs,
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118 | // long term_freq, String[] equiv_terms)
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119 | MID_addTerm = j_env->GetMethodID(JC_MGPPQueryResult, "addTerm", "(Ljava/lang/String;Ljava/lang/String;IJJ[Ljava/lang/String;)V");
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120 | if (MID_addTerm==NULL) {
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121 | cerr <<"MGPP JNI: method addTerm not found"<<endl;
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122 | }
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123 |
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124 | // setTotalDocs(long)
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125 | MID_setTotalDocs = j_env->GetMethodID(JC_MGPPQueryResult, "setTotalDocs", "(J)V");
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126 | if (MID_setTotalDocs==NULL) {
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127 | cerr <<"MGPP JNI: method setTotalDocs not found"<<endl;
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128 | }
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129 |
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130 | MID_clearResult = j_env->GetMethodID(JC_MGPPQueryResult, "clear", "()V");
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131 | if (MID_clearResult==NULL) {
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132 | cerr <<"MGPP JNI: method clear not found"<<endl;
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133 | }
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134 | MID_setSyntaxError = j_env->GetMethodID(JC_MGPPQueryResult, "setSyntaxError", "(Z)V");
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135 | if (MID_clearResult==NULL) {
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136 | cerr <<"MGPP JNI: method setSyntaxError not found"<<endl;
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137 | }
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138 |
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139 | // get the class for String to use in NewObjectArray in runQuery()
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140 | // FindClass returns a local reference - have to convert it to a global one
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141 | jclass local_CID_String = j_env->FindClass("java/lang/String");
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142 | if (local_CID_String==NULL) {
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143 | cerr <<"MGPP JNI: java String class not found"<<endl;
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144 | } else {
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145 | /* create a global ref */
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146 | CID_String = (jclass)j_env->NewGlobalRef(local_CID_String);
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147 | /* The local reference is no longer useful */
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148 | j_env->DeleteLocalRef(local_CID_String);
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149 |
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150 | /* Is the global reference created successfully? */
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151 | if (CID_String == NULL) {
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152 | return; /* out of memory exception thrown */
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153 | }
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154 | }
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155 |
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156 | }
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157 |
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158 | /* the java side MGPPSearchWrapper has a pointer to a C++ object - MGPPSearchData
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159 | initialise this and set the pointer
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160 | */
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161 | JNIEXPORT jboolean JNICALL
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162 | Java_org_greenstone_mgpp_MGPPSearchWrapper_initCppSide (JNIEnv *j_env, jobject j_obj){
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163 |
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164 | MGPPSearchData * data = new MGPPSearchData();
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165 | j_env->SetIntField(j_obj, FID_mgpp_data, (long)data);
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166 |
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167 | return true;
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168 |
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169 | }
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170 |
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171 | //******************************************
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172 | // do a query
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173 | // ****************************************
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174 |
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175 | /* load the IndexData - cached for querying
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176 | */
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177 | JNIEXPORT jboolean JNICALL
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178 | Java_org_greenstone_mgpp_MGPPSearchWrapper_loadIndexData (JNIEnv *j_env, jobject j_obj, jstring j_index_name) {
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179 |
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180 | jint data_ptr = j_env->GetIntField(j_obj, FID_mgpp_data);
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181 | MGPPSearchData * data = (MGPPSearchData *)data_ptr;
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182 |
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183 | #ifdef __WIN32__
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184 | const char* base_dir = "";
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185 | #else
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186 | const char* base_dir = "/";
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187 | #endif
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188 |
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189 | const char * index_name = j_env->GetStringUTFChars( j_index_name, NULL);
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190 | if (index_name==NULL) {
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191 | return false;
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192 | }
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193 |
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194 | jboolean j_result=false;
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195 |
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196 | // why doesn't this complain about const??
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197 | if (data->indexData->LoadData(base_dir, index_name)) {
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198 | j_result=true;
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199 | }
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200 |
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201 | // release any gets
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202 | j_env->ReleaseStringUTFChars(j_index_name, index_name);
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203 |
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204 | return j_result;
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205 | }
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206 |
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207 | /* unload the data
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208 | */
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209 | JNIEXPORT jboolean JNICALL
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210 | Java_org_greenstone_mgpp_MGPPSearchWrapper_unloadIndexData (JNIEnv *j_env, jobject j_obj) {
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211 |
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212 | jint data_ptr = j_env->GetIntField(j_obj, FID_mgpp_data);
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213 | MGPPSearchData * data = (MGPPSearchData *)data_ptr;
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214 |
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215 | data->indexData->UnloadData();
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216 | return true;
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217 |
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218 | }
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219 |
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220 | /* do the actual query - the results are written to query_result held on the
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221 | java side */
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222 | JNIEXPORT void JNICALL
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223 | Java_org_greenstone_mgpp_MGPPSearchWrapper_runQuery (JNIEnv *j_env, jobject j_obj, jstring j_query){
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224 |
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225 | jthrowable exc; // an exception - check if something funny has happened
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226 | const char *query = j_env->GetStringUTFChars(j_query, NULL);
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227 | if (query==NULL) {
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228 | return; // exception already thrown
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229 | }
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230 | // turn to UCArray for mgpp and then release the string
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231 | UCArray queryArray;
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232 | SetCStr(queryArray, query);
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233 | j_env->ReleaseStringUTFChars(j_query, query);
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234 |
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235 | // the query data
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236 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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237 |
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238 | // the result to write to
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239 | jobject result_ptr = j_env->GetObjectField(j_obj, FID_query_result);
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240 | if (result_ptr==NULL) {
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241 | cerr <<"couldn't access the result to write to"<<endl;
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242 | return;
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243 | }
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244 |
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245 | // clear the result
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246 | j_env->CallVoidMethod(result_ptr, MID_clearResult);
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247 | exc = j_env->ExceptionOccurred(); // this catches the exception I think - it
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248 | //wont be thrown any further
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249 | if (exc) {
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250 | j_env->ExceptionDescribe();
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251 | return;
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252 | }
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253 | // the mgpp QueryResult that we will use
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254 | ExtQueryResult queryResult;
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255 |
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256 | QueryNode * queryTree = NULL;
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257 | // parse the query string into a tree structure
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258 | queryTree = ParseQuery(queryArray, data->defaultBoolCombine,
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259 | data->defaultStemMethod, data->maxNumeric);
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260 | if (queryTree == NULL) {
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261 | // invalid syntax
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262 | j_env->CallVoidMethod(result_ptr, MID_setSyntaxError, true);
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263 | cerr << "MGPPSearchWrapperImpl: invalid query syntax!!\n";
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264 | return;
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265 | }
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266 | // print the query
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267 | PrintNode (cout, queryTree);
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268 | // finally, do the query
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269 | MGQuery(*(data->indexData), *(data->queryInfo), queryTree, queryResult, data->level);
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270 |
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271 | delete queryTree;
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272 |
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273 | // convert queryResult to the java side version
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274 | // use levels rather than docs of ExtQueryResult
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275 | // CallVoidMethod(obj, method id, args to method)
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276 | for (int i=0; i<queryResult.levels.size(); i++) {
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277 | jlong doc = queryResult.levels[i];
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278 | jfloat rank = queryResult.ranks[i];
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279 | j_env->CallVoidMethod(result_ptr, MID_addDoc, doc, rank);
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280 | exc = j_env->ExceptionOccurred();
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281 | if (exc) {
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282 | j_env->ExceptionDescribe();
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283 | return;
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284 | }
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285 |
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286 | }
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287 |
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288 | // actual num of docs
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289 | jlong total = queryResult.actualNumDocs;
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290 | j_env->CallVoidMethod(result_ptr, MID_setTotalDocs, total);
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291 | exc = j_env->ExceptionOccurred();
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292 | if (exc) {
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293 | j_env->ExceptionDescribe();
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294 | return;
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295 | }
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296 |
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297 | // the terms
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298 | for (int j=0; j<queryResult.termFreqs.size(); j++) {
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299 |
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300 | TermFreqData tf = queryResult.termFreqs[j];
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301 | jstring term = j_env->NewStringUTF(GetCStr(tf.term));
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302 | jstring tag = j_env->NewStringUTF(GetCStr(tf.tag));
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303 | jint stem = tf.stemMethod;
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304 | jlong match = tf.matchDocs;
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305 | jlong freq = tf.termFreq;
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306 |
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307 | jobjectArray equivs=NULL;
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308 | jstring empty = j_env->NewStringUTF(""); // the initial object to fill the array
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309 | jint num_equivs = tf.equivTerms.size();
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310 | equivs = j_env->NewObjectArray(num_equivs, CID_String, empty);
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311 | if (equivs==NULL) {
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312 | cerr<<"couldn't create object array"<<endl;
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313 |
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314 | } else {
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315 | for (int k=0; k<num_equivs;k++) {
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316 | jstring equiv = j_env->NewStringUTF(GetCStr(tf.equivTerms[k]));
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317 | j_env->SetObjectArrayElement(equivs, k, equiv);
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318 | }
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319 |
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320 |
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321 | j_env->CallVoidMethod(result_ptr, MID_addTerm, term, tag, stem, match, freq, equivs);
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322 | exc = j_env->ExceptionOccurred();
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323 | if (exc) {
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324 | j_env->ExceptionDescribe();
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325 | return;
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326 | }
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327 | }
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328 | }
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329 |
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330 |
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331 | }
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332 |
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333 | JNIEXPORT void JNICALL
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334 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setStem (JNIEnv *j_env,
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335 | jobject j_obj,
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336 | jboolean j_on) {
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337 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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338 | if (j_on) {
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339 | data->defaultStemMethod |= 2;
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340 | } else {
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341 | data->defaultStemMethod &= 0xd;
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342 | }
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343 |
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344 | }
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345 |
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346 | JNIEXPORT void JNICALL
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347 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setAccentFold (JNIEnv *j_env,
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348 | jobject j_obj,
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349 | jboolean j_on) {
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350 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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351 | if (j_on) {
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352 | data->defaultStemMethod |= 4;
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353 | } else {
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354 | data->defaultStemMethod &= 0xb;
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355 | }
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356 | }
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357 |
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358 |
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359 | JNIEXPORT void JNICALL
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360 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setCase (JNIEnv *j_env,
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361 | jobject j_obj,
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362 | jboolean j_on) {
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363 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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364 |
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365 | if (j_on) {
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366 | data->defaultStemMethod |= 1;
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367 | } else {
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368 | data->defaultStemMethod &= 0xe;
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369 | }
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370 | }
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371 |
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372 | JNIEXPORT void JNICALL
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373 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setMaxDocs (JNIEnv *j_env,
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374 | jobject j_obj,
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375 | jint j_max) {
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376 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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377 | data->queryInfo->maxDocs=j_max;
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378 | }
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379 |
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380 | JNIEXPORT void JNICALL
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381 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setMaxNumeric (JNIEnv *j_env,
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382 | jobject j_obj,
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383 | jint j_max) {
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384 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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385 | data->maxNumeric=j_max;
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386 | }
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387 |
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388 | JNIEXPORT void JNICALL
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389 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setSortByRank (JNIEnv *j_env,
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390 | jobject j_obj,
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391 | jboolean j_on) {
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392 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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393 |
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394 | data->queryInfo->sortByRank=j_on;
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395 | }
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396 |
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397 | JNIEXPORT void JNICALL
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398 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setReturnTerms(JNIEnv *j_env,
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399 | jobject j_obj,
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400 | jboolean j_on) {
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401 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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402 | data->queryInfo->needTermFreqs = j_on;
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403 |
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404 | }
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405 |
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406 | JNIEXPORT void JNICALL
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407 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setQueryLevel(JNIEnv *j_env,
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408 | jobject j_obj,
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409 | jstring j_level){
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410 |
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411 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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412 |
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413 | const char * level = j_env->GetStringUTFChars(j_level, NULL);
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414 | if (level==NULL) {
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415 | return; // exception already thrown
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416 | }
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417 |
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418 | data->queryInfo->docLevel.clear();
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419 | SetCStr(data->queryInfo->docLevel, level);
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420 |
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421 | // release the java stuff
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422 | j_env->ReleaseStringUTFChars(j_level, level);
|
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423 |
|
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424 | }
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425 |
|
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426 | JNIEXPORT void JNICALL
|
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427 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setReturnLevel(JNIEnv *j_env,
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428 | jobject j_obj,
|
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429 | jstring j_level){
|
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430 |
|
---|
431 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
|
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432 |
|
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433 | const char * level = j_env->GetStringUTFChars(j_level, NULL);
|
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434 | if (level==NULL) {
|
---|
435 | return; // exception already thrown
|
---|
436 | }
|
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437 |
|
---|
438 | data->level.clear();
|
---|
439 | SetCStr(data->level, level);
|
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440 |
|
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441 | // release the java stuff
|
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442 | j_env->ReleaseStringUTFChars(j_level, level);
|
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443 |
|
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444 |
|
---|
445 | }
|
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446 |
|
---|
447 | JNIEXPORT void JNICALL
|
---|
448 | Java_org_greenstone_mgpp_MGPPSearchWrapper_setMatchMode (JNIEnv *j_env,
|
---|
449 | jobject j_obj,
|
---|
450 | jint j_mode){
|
---|
451 |
|
---|
452 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
|
---|
453 | data->defaultBoolCombine=j_mode;
|
---|
454 |
|
---|
455 | }
|
---|
456 |
|
---|
457 | JNIEXPORT jstring JNICALL
|
---|
458 | Java_org_greenstone_mgpp_MGPPSearchWrapper_getQueryParams (JNIEnv *j_env,
|
---|
459 | jobject j_obj){
|
---|
460 |
|
---|
461 | MGPPSearchData * data = (MGPPSearchData *)j_env->GetIntField(j_obj, FID_mgpp_data);
|
---|
462 |
|
---|
463 | // print the data to a stringstream, then convert to char*, then to
|
---|
464 | //jstring
|
---|
465 |
|
---|
466 | stringstream output;
|
---|
467 | output << "Query params:"<<endl
|
---|
468 | // need to change this to use platform specific separator for niceness
|
---|
469 | << "index\t\t"<<data->indexData->basePath<<"/"<<data->indexData->filename<<endl
|
---|
470 | <<"search level\t"<<GetCStr(data->queryInfo->docLevel)<<endl
|
---|
471 | <<"result level\t"<<GetCStr(data->level)<<endl
|
---|
472 | <<"casefold\t"<<(data->defaultStemMethod&1)<<endl
|
---|
473 | <<"stem\t\t"<<(data->defaultStemMethod&2)<<endl
|
---|
474 | <<"order by rank\t"<<data->queryInfo->sortByRank<<endl
|
---|
475 | <<"query type\t"<<(data->defaultBoolCombine==1?"all":"some")<<endl
|
---|
476 | <<"max docs\t"<<data->queryInfo->maxDocs<<endl<<ends;
|
---|
477 |
|
---|
478 | const char *result = output.str().c_str();
|
---|
479 | jstring j_result = j_env->NewStringUTF(result);
|
---|
480 | delete (char *)result;
|
---|
481 | return j_result;
|
---|
482 | }
|
---|