1 | #ifdef __WIN32__
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2 | #include <WIN32cfg.h>
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3 | #include <strstream>
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4 | #include <sstream>
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5 | #else
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6 | #ifdef __APPLE__
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7 | #include <strstream>
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8 | #include <sstream>
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9 | #else
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10 | #include <sstream>
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11 | #endif
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12 | #endif
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13 |
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14 | #include <jni.h>
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15 | #include "org_greenstone_mgpp_MGPPWrapper.h"
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16 | #include "MGPPWrapperImpl.h"
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17 | #include "TextGet.h"
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18 | #include "GSDLQueryParser.h"
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19 | #include "MGQuery.h"
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20 |
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21 | MGPPWrapperData::MGPPWrapperData() {
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22 | indexData = new IndexData();
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23 | queryInfo = new QueryInfo();
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24 |
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25 | if (queryInfo==NULL) {
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26 | cerr<<"couldn't allocate new query info\n";
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27 | if (indexData!=NULL) {
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28 | delete indexData;
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29 | }
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30 | }
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31 |
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32 | // set all the default params
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33 | SetCStr(queryInfo->docLevel, "Document"); // the level to search at
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34 | queryInfo->maxDocs = 50;
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35 | queryInfo->sortByRank = true;
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36 | queryInfo->exactWeights = false;
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37 | queryInfo->needRankInfo = true;
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38 | queryInfo->needTermFreqs = true;
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39 |
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40 | UCArrayClear(level);
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41 | SetCStr(level, "Document"); // the level to return docs at
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42 | defaultStemMethod=0;
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43 | defaultBoolCombine=0;
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44 |
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45 | }
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46 |
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47 | MGPPWrapperData::~MGPPWrapperData() {
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48 | if (indexData !=NULL) {
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49 | delete indexData;
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50 | }
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51 | if (queryInfo !=NULL) {
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52 | delete queryInfo;
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53 | }
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54 | }
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55 |
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56 | // ********************************************
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57 | // initialisation stuff
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58 | // ********************************************
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59 |
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60 | // cached ids for java stuff
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61 | jfieldID FID_mgpp_data = NULL; // MGPPWrapperData
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62 | jfieldID FID_query_result = NULL; // MGPPQueryResult
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63 | jmethodID MID_addDoc=NULL; // MGPPQueryResult.addDoc()
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64 | jmethodID MID_addTerm=NULL; // MGPPQueryResult.addTerm()
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65 | jmethodID MID_setTotalDocs=NULL; // MGPPQueryResult.setTotalDocs()
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66 | jmethodID MID_clearResult=NULL; //MGPPQueryResult.clear()
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67 | jmethodID MID_setSyntaxError=NULL; // MGPPQueryResult.setSyntaxError()
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68 | jclass CID_String=NULL; // class ID of String
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69 |
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70 | /* to access objects and methods on java side, need their field/method ids -
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71 | this initialises them at the start to avoid recalculating them each time they
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72 | are needed
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73 | Note: the descriptors need to be exactly right, otherwise you get an error
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74 | saying "no such field" but no reference to the fact that it has the right
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75 | name but the wrong type.
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76 | Note: apparently the jclass is a local ref and should only work
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77 | in the method that created it. It seems to work ok, but I'll make it
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78 | global cos the book said I should, and it may avoid future hassles.
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79 | */
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80 | JNIEXPORT void JNICALL
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81 | Java_org_greenstone_mgpp_MGPPWrapper_initIDs (JNIEnv *j_env, jclass j_cls) {
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82 |
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83 | FID_mgpp_data = j_env->GetFieldID(j_cls, "mgpp_data_ptr_", "J"); //a long-"J"
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84 | if (FID_mgpp_data==NULL) {
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85 | cerr <<"MGPP JNI: field mgpp_data_ptr_ not found"<<endl;
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86 | }
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87 |
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88 | FID_query_result = j_env->GetFieldID(j_cls, "mgpp_query_result_", "Lorg/greenstone/mgpp/MGPPQueryResult;"); // an object -"L<class name>;"
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89 | if (FID_query_result==NULL) {
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90 | cerr <<"MGPP JNI: field mgpp_query_result_ not found"<<endl;
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91 | }
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92 | // the methods we want to use
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93 |
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94 | // addDoc(long doc, float rank)
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95 | jclass JC_MGPPQueryResult = j_env->FindClass("org/greenstone/mgpp/MGPPQueryResult");
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96 | MID_addDoc = j_env->GetMethodID(JC_MGPPQueryResult, "addDoc", "(JF)V");
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97 | if (MID_addDoc==NULL) {
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98 | cerr <<"MGPP JNI: addDoc method not found"<<endl;
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99 | }
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100 | // addTerm(String term, String tag, int stem_method, long match_docs,
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101 | // long term_freq, String[] equiv_terms)
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102 | MID_addTerm = j_env->GetMethodID(JC_MGPPQueryResult, "addTerm", "(Ljava/lang/String;Ljava/lang/String;IJJ[Ljava/lang/String;)V");
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103 | if (MID_addTerm==NULL) {
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104 | cerr <<"MGPP JNI: method addTerm not found"<<endl;
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105 | }
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106 |
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107 | // setTotalDocs(long)
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108 | MID_setTotalDocs = j_env->GetMethodID(JC_MGPPQueryResult, "setTotalDocs", "(J)V");
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109 | if (MID_setTotalDocs==NULL) {
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110 | cerr <<"MGPP JNI: method setTotalDocs not found"<<endl;
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111 | }
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112 |
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113 | MID_clearResult = j_env->GetMethodID(JC_MGPPQueryResult, "clear", "()V");
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114 | if (MID_clearResult==NULL) {
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115 | cerr <<"MGPP JNI: method clear not found"<<endl;
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116 | }
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117 | MID_setSyntaxError = j_env->GetMethodID(JC_MGPPQueryResult, "setSyntaxError", "(Z)V");
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118 | if (MID_clearResult==NULL) {
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119 | cerr <<"MGPP JNI: method setSyntaxError not found"<<endl;
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120 | }
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121 |
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122 | // get the class for String to use in NewObjectArray in runQuery()
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123 | // FindClass returns a local reference - have to convert it to a global one
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124 | jclass local_CID_String = j_env->FindClass("java/lang/String");
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125 | if (local_CID_String==NULL) {
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126 | cerr <<"MGPP JNI: java String class not found"<<endl;
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127 | } else {
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128 | /* create a global ref */
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129 | CID_String = (jclass)j_env->NewGlobalRef(local_CID_String);
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130 | /* The local reference is no longer useful */
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131 | j_env->DeleteLocalRef(local_CID_String);
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132 |
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133 | /* Is the global reference created successfully? */
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134 | if (CID_String == NULL) {
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135 | return; /* out of memory exception thrown */
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136 | }
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137 | }
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138 |
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139 | }
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140 |
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141 | /* the java side MGPPWrapper has a pointer to a C++ object - MGPPWrapperData
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142 | initialise this and set the pointer
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143 | */
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144 | JNIEXPORT jboolean JNICALL
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145 | Java_org_greenstone_mgpp_MGPPWrapper_initCppSide (JNIEnv *j_env, jobject j_obj){
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146 |
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147 | MGPPWrapperData * data = new MGPPWrapperData();
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148 | j_env->SetIntField(j_obj, FID_mgpp_data, (long)data);
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149 |
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150 | return true;
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151 |
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152 | }
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153 |
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154 | //****************************************************
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155 | // retrieve a document
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156 | //****************************************************
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157 |
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158 | /* returns a document from mgpp as a string
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159 | Note: TextData isn't cached - just reloaded each time
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160 | */
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161 | JNIEXPORT jstring JNICALL
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162 | Java_org_greenstone_mgpp_MGPPWrapper_getDocument (JNIEnv *j_env,
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163 | jobject j_obj, jstring j_text_name, jstring j_level, jlong j_docnum) {
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164 |
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165 | #ifdef __WIN32__
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166 | const char* base_dir = "";
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167 | #else
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168 | const char* base_dir = "/";
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169 | #endif
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170 |
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171 | const char * text_name = j_env->GetStringUTFChars(j_text_name, NULL);
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172 | if (text_name==NULL) {
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173 | return NULL;
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174 | }
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175 |
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176 | const char * level = j_env->GetStringUTFChars( j_level, NULL);
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177 | if (level==NULL) {
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178 | j_env->ReleaseStringUTFChars(j_text_name, text_name);
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179 | return NULL;
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180 | }
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181 |
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182 | // does this work alright? j_docnum is a long (64 bit)
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183 | unsigned long docnum = j_docnum;
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184 | TextData td;
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185 |
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186 | // cast to char* otherwise complains about const
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187 | td.LoadData((char *)base_dir, (char *)text_name);
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188 |
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189 | UCArray mg_level;
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190 | SetCStr(mg_level, level);
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191 | UCArray docText;
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192 | docText.clear();
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193 | // get the actual text
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194 | if (!GetDocText(td, mg_level, docnum, docText)) {
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195 | cerr <<"MGPP JNI: couldn't retrieve doc text"<<endl;
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196 | }
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197 |
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198 | td.UnloadData();
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199 |
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200 | char * doc = GetCStr(docText); // do I need to free this char *??
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201 | jstring result = j_env->NewStringUTF(doc);
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202 | // release any gets
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203 | j_env->ReleaseStringUTFChars(j_text_name, text_name);
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204 | j_env->ReleaseStringUTFChars(j_level, level);
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205 |
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206 | // free any C++ stuff
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207 | delete doc;
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208 |
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209 | return result;
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210 |
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211 | }
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212 |
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213 | //******************************************
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214 | // do a query
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215 | // ****************************************
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216 |
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217 | /* load the IndexData - cached for querying
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218 | */
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219 | JNIEXPORT jboolean JNICALL
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220 | Java_org_greenstone_mgpp_MGPPWrapper_loadIndexData (JNIEnv *j_env, jobject j_obj, jstring j_index_name) {
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221 |
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222 | jint data_ptr = j_env->GetIntField(j_obj, FID_mgpp_data);
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223 | MGPPWrapperData * data = (MGPPWrapperData *)data_ptr;
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224 |
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225 | #ifdef __WIN32__
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226 | const char* base_dir = "";
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227 | #else
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228 | const char* base_dir = "/";
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229 | #endif
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230 |
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231 | const char * index_name = j_env->GetStringUTFChars( j_index_name, NULL);
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232 | if (index_name==NULL) {
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233 | return false;
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234 | }
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235 |
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236 | jboolean j_result=false;
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237 |
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238 | // why doesn't this complain about const??
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239 | if (data->indexData->LoadData(base_dir, index_name)) {
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240 | j_result=true;
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241 | }
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242 |
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243 | // release any gets
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244 | j_env->ReleaseStringUTFChars(j_index_name, index_name);
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245 |
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246 | return j_result;
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247 | }
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248 |
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249 | /* unload the data
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250 | */
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251 | JNIEXPORT jboolean JNICALL
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252 | Java_org_greenstone_mgpp_MGPPWrapper_unloadIndexData (JNIEnv *j_env, jobject j_obj) {
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253 |
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254 | jint data_ptr = j_env->GetIntField(j_obj, FID_mgpp_data);
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255 | MGPPWrapperData * data = (MGPPWrapperData *)data_ptr;
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256 |
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257 | data->indexData->UnloadData();
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258 | return true;
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259 |
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260 | }
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261 |
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262 | /* do the actual query - the results are written to query_result held on the
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263 | java side */
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264 | JNIEXPORT void JNICALL
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265 | Java_org_greenstone_mgpp_MGPPWrapper_runQuery (JNIEnv *j_env, jobject j_obj, jstring j_query){
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266 |
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267 | jthrowable exc; // an exception - check if something funny has happened
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268 | const char *query = j_env->GetStringUTFChars(j_query, NULL);
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269 | if (query==NULL) {
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270 | return; // exception already thrown
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271 | }
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272 | // turn to UCArray for mgpp and then release the string
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273 | UCArray queryArray;
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274 | SetCStr(queryArray, query);
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275 | j_env->ReleaseStringUTFChars(j_query, query);
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276 |
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277 | // the query data
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278 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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279 |
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280 | // the result to write to
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281 | jobject result_ptr = j_env->GetObjectField(j_obj, FID_query_result);
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282 | if (result_ptr==NULL) {
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283 | cerr <<"couldn't access the result to write to"<<endl;
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284 | return;
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285 | }
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286 |
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287 | // clear the result
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288 | j_env->CallVoidMethod(result_ptr, MID_clearResult);
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289 | exc = j_env->ExceptionOccurred(); // this catches teh exception I think - it
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290 | //wont be thrown any further
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291 | if (exc) {
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292 | j_env->ExceptionDescribe();
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293 | return;
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294 | }
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295 | // the mgpp QueryResult that we will use
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296 | ExtQueryResult queryResult;
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297 |
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298 | QueryNode * queryTree = NULL;
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299 | // parse the query string into a tree structure
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300 | queryTree = ParseQuery(queryArray, data->defaultBoolCombine,
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301 | data->defaultStemMethod);
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302 | if (queryTree == NULL) {
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303 | // invalid syntax
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304 | j_env->CallVoidMethod(result_ptr, MID_setSyntaxError, true);
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305 | cerr << "MGPPWrapperImpl: invalid query syntax!!\n";
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306 | return;
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307 | }
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308 | // print the query
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309 | PrintNode (cout, queryTree);
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310 | // finally, do the query
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311 | MGQuery(*(data->indexData), *(data->queryInfo), queryTree, queryResult, data->level);
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312 |
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313 | delete queryTree;
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314 |
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315 | // convert queryResult to the java side version
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316 | // use levels rather than docs of ExtQueryResult
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317 | // CallVoidMethod(obj, method id, args to method)
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318 | for (int i=0; i<queryResult.levels.size(); i++) {
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319 | jlong doc = queryResult.levels[i];
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320 | jfloat rank = queryResult.ranks[i];
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321 | j_env->CallVoidMethod(result_ptr, MID_addDoc, doc, rank);
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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 | // actual num of docs
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331 | jlong total = queryResult.actualNumDocs;
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332 | j_env->CallVoidMethod(result_ptr, MID_setTotalDocs, total);
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333 | exc = j_env->ExceptionOccurred();
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334 | if (exc) {
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335 | j_env->ExceptionDescribe();
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336 | return;
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337 | }
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338 |
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339 | // the terms
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340 | for (int j=0; j<queryResult.termFreqs.size(); j++) {
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341 |
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342 | TermFreqData tf = queryResult.termFreqs[j];
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343 | jstring term = j_env->NewStringUTF(GetCStr(tf.term));
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344 | jstring tag = j_env->NewStringUTF(GetCStr(tf.tag));
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345 | jint stem = tf.stemMethod;
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346 | jlong match = tf.matchDocs;
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347 | jlong freq = tf.termFreq;
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348 |
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349 | jobjectArray equivs=NULL;
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350 | jstring empty = j_env->NewStringUTF(""); // the initial object to fill the array
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351 | jint num_equivs = tf.equivTerms.size();
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352 | equivs = j_env->NewObjectArray(num_equivs, CID_String, empty);
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353 | if (equivs==NULL) {
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354 | cerr<<"couldn't create object array"<<endl;
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355 |
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356 | } else {
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357 | for (int k=0; k<num_equivs;k++) {
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358 | jstring equiv = j_env->NewStringUTF(GetCStr(tf.equivTerms[k]));
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359 | j_env->SetObjectArrayElement(equivs, k, equiv);
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360 | }
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361 |
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362 |
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363 | j_env->CallVoidMethod(result_ptr, MID_addTerm, term, tag, stem, match, freq, equivs);
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364 | exc = j_env->ExceptionOccurred();
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365 | if (exc) {
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366 | j_env->ExceptionDescribe();
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367 | return;
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368 | }
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369 | }
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370 | }
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371 |
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372 |
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373 | }
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374 |
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375 | JNIEXPORT void JNICALL
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376 | Java_org_greenstone_mgpp_MGPPWrapper_setStem (JNIEnv *j_env,
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377 | jobject j_obj,
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378 | jboolean j_on) {
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379 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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380 | if (j_on) {
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381 | data->defaultStemMethod |= 2;
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382 | } else {
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383 | data->defaultStemMethod &= 0xd;
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384 | }
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385 |
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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_MGPPWrapper_setCase (JNIEnv *j_env,
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390 | jobject j_obj,
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391 | jboolean j_on) {
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392 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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393 |
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394 | if (j_on) {
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395 | data->defaultStemMethod |= 1;
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396 | } else {
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397 | data->defaultStemMethod &= 0xe;
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398 | }
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399 | }
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400 |
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401 | JNIEXPORT void JNICALL
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402 | Java_org_greenstone_mgpp_MGPPWrapper_setMaxDocs (JNIEnv *j_env,
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403 | jobject j_obj,
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404 | jint j_max) {
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405 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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406 | data->queryInfo->maxDocs=j_max;
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407 | }
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408 |
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409 | JNIEXPORT void JNICALL
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410 | Java_org_greenstone_mgpp_MGPPWrapper_setSortByRank (JNIEnv *j_env,
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411 | jobject j_obj,
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412 | jboolean j_on) {
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413 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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414 |
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415 | data->queryInfo->sortByRank=j_on;
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416 | }
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417 |
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418 | JNIEXPORT void JNICALL
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419 | Java_org_greenstone_mgpp_MGPPWrapper_setReturnTerms(JNIEnv *j_env,
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420 | jobject j_obj,
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421 | jboolean j_on) {
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422 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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423 | data->queryInfo->needTermFreqs = j_on;
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424 |
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425 | }
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426 |
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427 | JNIEXPORT void JNICALL
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428 | Java_org_greenstone_mgpp_MGPPWrapper_setQueryLevel(JNIEnv *j_env,
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429 | jobject j_obj,
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430 | jstring j_level){
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431 |
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432 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
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433 |
|
---|
434 | const char * level = j_env->GetStringUTFChars(j_level, NULL);
|
---|
435 | if (level==NULL) {
|
---|
436 | return; // exception already thrown
|
---|
437 | }
|
---|
438 |
|
---|
439 | data->queryInfo->docLevel.clear();
|
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440 | SetCStr(data->queryInfo->docLevel, level);
|
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441 |
|
---|
442 | // release the java stuff
|
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443 | j_env->ReleaseStringUTFChars(j_level, level);
|
---|
444 |
|
---|
445 | }
|
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446 |
|
---|
447 | JNIEXPORT void JNICALL
|
---|
448 | Java_org_greenstone_mgpp_MGPPWrapper_setReturnLevel(JNIEnv *j_env,
|
---|
449 | jobject j_obj,
|
---|
450 | jstring j_level){
|
---|
451 |
|
---|
452 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
|
---|
453 |
|
---|
454 | const char * level = j_env->GetStringUTFChars(j_level, NULL);
|
---|
455 | if (level==NULL) {
|
---|
456 | return; // exception already thrown
|
---|
457 | }
|
---|
458 |
|
---|
459 | data->level.clear();
|
---|
460 | SetCStr(data->level, level);
|
---|
461 |
|
---|
462 | // release the java stuff
|
---|
463 | j_env->ReleaseStringUTFChars(j_level, level);
|
---|
464 |
|
---|
465 |
|
---|
466 | }
|
---|
467 |
|
---|
468 | JNIEXPORT void JNICALL
|
---|
469 | Java_org_greenstone_mgpp_MGPPWrapper_setMatchMode (JNIEnv *j_env,
|
---|
470 | jobject j_obj,
|
---|
471 | jint j_mode){
|
---|
472 |
|
---|
473 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
|
---|
474 | data->defaultBoolCombine=j_mode;
|
---|
475 |
|
---|
476 | }
|
---|
477 |
|
---|
478 | JNIEXPORT jstring JNICALL
|
---|
479 | Java_org_greenstone_mgpp_MGPPWrapper_getQueryParams (JNIEnv *j_env,
|
---|
480 | jobject j_obj){
|
---|
481 |
|
---|
482 | MGPPWrapperData * data = (MGPPWrapperData *)j_env->GetIntField(j_obj, FID_mgpp_data);
|
---|
483 |
|
---|
484 | // print the data to a stringstream, then convert to char*, then to
|
---|
485 | //jstring
|
---|
486 |
|
---|
487 | stringstream output;
|
---|
488 | output << "Query params:"<<endl
|
---|
489 | // need to change this to use platform specific separator for niceness
|
---|
490 | << "index\t\t"<<data->indexData->basePath<<"/"<<data->indexData->filename<<endl
|
---|
491 | <<"search level\t"<<GetCStr(data->queryInfo->docLevel)<<endl
|
---|
492 | <<"result level\t"<<GetCStr(data->level)<<endl
|
---|
493 | <<"casefold\t"<<(data->defaultStemMethod&1)<<endl
|
---|
494 | <<"stem\t\t"<<(data->defaultStemMethod&2)<<endl
|
---|
495 | <<"order by rank\t"<<data->queryInfo->sortByRank<<endl
|
---|
496 | <<"query type\t"<<(data->defaultBoolCombine==1?"all":"some")<<endl
|
---|
497 | <<"max docs\t"<<data->queryInfo->maxDocs<<endl<<ends;
|
---|
498 |
|
---|
499 | const char *result = output.str().c_str();
|
---|
500 | jstring j_result = j_env->NewStringUTF(result);
|
---|
501 | delete (char *)result;
|
---|
502 | return j_result;
|
---|
503 | }
|
---|