352 lines
7.5 KiB
C++
352 lines
7.5 KiB
C++
/*=============================================================================
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# Filename: ResultSet.cpp
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# Author: Bookug Lobert
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# Mail: 1181955272@qq.com
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# Last Modified: 2015-10-24 22:01
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# Description: implement functions in ResultSet.h
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=============================================================================*/
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#include "ResultSet.h"
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using namespace std;
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ResultSet::ResultSet()
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{
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this->select_var_num = 0;
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this->var_name = NULL;
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this->ansNum = 0;
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this->answer = NULL;
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this->stream = NULL;
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this->useStream = false;
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this->output_offset = 0;
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this->output_limit = -1;
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}
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ResultSet::~ResultSet()
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{
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delete[] this->var_name;
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if (!this->useStream)
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{
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for(unsigned i = 0; i < this->ansNum; i++)
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{
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delete[] this->answer[i];
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}
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delete[] this->answer;
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}
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else
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{
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delete this->stream; //maybe NULL
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}
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}
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ResultSet::ResultSet(int _v_num, const string* _v_names)
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{
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this->select_var_num = _v_num;
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this->var_name = new string[this->select_var_num];
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for(int i = 0; i < this->select_var_num; i++)
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{
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this->var_name[i] = _v_names[i];
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}
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this->ansNum = 0;
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this->answer = NULL;
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this->stream = NULL;
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this->useStream = false;
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this->output_offset = 0;
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this->output_limit = -1;
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}
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void
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ResultSet::setUseStream()
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{
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this->useStream = true;
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}
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bool
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ResultSet::checkUseStream()
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{
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return this->useStream;
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}
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void
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ResultSet::setOutputOffsetLimit(unsigned _output_offset, unsigned _output_limit)
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{
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this->output_offset = _output_offset;
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this->output_limit = _output_limit;
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}
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void
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ResultSet::setVar(const vector<string> & _var_names)
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{
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this->select_var_num = _var_names.size();
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this->var_name = new string[this->select_var_num];
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for(int i = 0; i < this->select_var_num; i++)
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{
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this->var_name[i] = _var_names[i];
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}
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}
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//convert to TSV string
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string
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ResultSet::to_str()
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{
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unsigned ans_num = max((long long)this->ansNum - this->output_offset, (long long)0);
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if (this->output_limit != -1)
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ans_num = min(ans_num, this->output_limit);
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if(ans_num == 0)
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{
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return "[empty result]\n";
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}
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stringstream _buf;
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for(int i = 0; i < this->select_var_num; i++)
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{
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if (i != 0)
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_buf << "\t";
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_buf << this->var_name[i];
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}
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_buf << "\n";
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if (this->useStream)
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this->resetStream();
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const Bstr* bp;
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for(unsigned i = (!this->useStream ? this->output_offset : 0); i < this->ansNum; i++)
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{
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if (this->output_limit != -1 && i == this->output_offset + this->output_limit)
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break;
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if (this->useStream)
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bp = this->stream->read();
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if (i >= this->output_offset)
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{
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for(int j = 0; j < this->select_var_num; j++)
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{
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if (j != 0)
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_buf << "\t";
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if (!this->useStream)
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_buf << Util::node2string(this->answer[i][j].c_str());
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else
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_buf << Util::node2string(bp[j].getStr());
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}
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_buf << "\n";
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}
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}
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return _buf.str();
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}
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//convert to JSON string
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string
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ResultSet::to_JSON()
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{
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stringstream _buf;
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_buf << "{ \"head\": { \"link\": [], \"vars\": [";
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for (int i = 0; i < this->select_var_num; i++)
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{
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if (i != 0)
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_buf << ", ";
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_buf << "\"" + this->var_name[i].substr(1) + "\"";
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}
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_buf << "] }, \n";
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_buf << "\t\"results\": \n";
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_buf << "\t{\n";
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_buf << "\t\t\"bindings\": \n";
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_buf << "\t\t[\n";
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if (this->useStream)
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this->resetStream();
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const Bstr* bp;
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for(unsigned i = (!this->useStream ? this->output_offset : 0); i < this->ansNum; i++)
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{
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if (this->output_limit != -1 && i == this->output_offset + this->output_limit)
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break;
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if (this->useStream)
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bp = this->stream->read();
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if (i >= this->output_offset)
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{
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if (i != this->output_offset)
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_buf << ",\n";
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_buf << "\t\t\t{ ";
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bool list_empty = true;
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for(int j = 0; j < this->select_var_num; j++)
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{
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string ans_type, ans_str;
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if (!this->useStream)
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ans_str = this->answer[i][j];
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else
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ans_str = string(bp[j].getStr());
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if (ans_str.length() == 0)
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continue;
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if (!list_empty)
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_buf << ",\t";
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if (ans_str[0] == '<')
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{
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ans_type = "uri";
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ans_str = ans_str.substr(1, ans_str.length() - 2);
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_buf << "\"" + this->var_name[j].substr(1) + "\": { ";
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_buf << "\"type\": \"" + ans_type + "\", \"value\": \"" + Util::node2string(ans_str.c_str()) + "\" }";
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}
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else if (ans_str[0] == '"' && ans_str.find("\"^^<") == -1 && ans_str[ans_str.length() - 1] != '>' )
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{
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ans_type = "literal";
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ans_str = ans_str.substr(1, ans_str.rfind('"') - 1);
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_buf << "\"" + this->var_name[j].substr(1) + "\": { ";
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_buf << "\"type\": \"" + ans_type + "\", \"value\": \"" + Util::node2string(ans_str.c_str()) + "\" }";
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}
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else if (ans_str[0] == '"' && ans_str.find("\"^^<") != -1 && ans_str[ans_str.length() - 1] == '>' )
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{
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ans_type = "typed-literal";
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int pos = ans_str.find("\"^^<");
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string data_type = ans_str.substr(pos + 4, ans_str.length() - pos - 5);
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ans_str = ans_str.substr(1, pos - 1);
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_buf << "\"" + this->var_name[j].substr(1) + "\": { ";
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_buf << "\"type\": \"" + ans_type + "\", \"datatype\": \"" + data_type + "\", \"value\": \"" + Util::node2string(ans_str.c_str()) + "\" }";
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}
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list_empty = false;
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}
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_buf << "}";
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}
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}
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_buf << "\n\t\t]\n";
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_buf << "\t}\n";
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_buf << "}\n";
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return _buf.str();
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}
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void
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ResultSet::output(FILE* _fp)
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{
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if (this->useStream)
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{
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unsigned ans_num = max((long long)this->ansNum - this->output_offset, (long long)0);
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if (this->output_limit != -1)
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ans_num = min(ans_num, this->output_limit);
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if(ans_num == 0)
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{
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fprintf(_fp, "[empty result]\n");
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return;
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}
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fprintf(_fp, "%s", this->var_name[0].c_str());
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for(int i = 1; i < this->select_var_num; i++)
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{
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fprintf(_fp, "\t%s", this->var_name[i].c_str());
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}
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fprintf(_fp, "\n");
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const Bstr* bp;
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for(unsigned i = 0; i < this->ansNum; i++)
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{
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if (this->output_limit != -1 && i == this->output_offset + this->output_limit)
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break;
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bp = this->stream->read();
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if (i >= this->output_offset)
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{
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fprintf(_fp, "%s", Util::node2string(bp[0].getStr()).c_str());
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for(int j = 1; j < this->select_var_num; j++)
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{
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fprintf(_fp, "\t%s", Util::node2string(bp[j].getStr()).c_str());
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}
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fprintf(_fp, "\n");
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}
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}
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}
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else
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{
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fprintf(_fp, "%s", this->to_str().c_str());
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}
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}
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void
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ResultSet::openStream(vector<unsigned> &_keys, vector<bool> &_desc)
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{
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if (this->useStream)
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{
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#ifdef DEBUG_STREAM
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vector<int> debug_keys;
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vector<bool> debug_desc;
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for(int i = 0; i < this->select_var_num; ++i)
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{
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debug_keys.push_back(i);
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debug_desc.push_back(false);
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}
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#endif
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if(this->stream != NULL)
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{
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delete this->stream;
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this->stream = NULL;
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}
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#ifdef DEBUG_STREAM
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if(this->ansNum > 0)
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this->stream = new Stream(debug_keys, debug_desc, this->ansNum, this->select_var_num, true);
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#else
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if(this->ansNum > 0)
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this->stream = new Stream(_keys, _desc, this->ansNum, this->select_var_num, _keys.size() > 0);
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#endif //DEBUG_STREAM
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}
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}
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void
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ResultSet::resetStream()
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{
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if (this->useStream)
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{
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//this->stream.reset();
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if(this->stream != NULL)
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this->stream->setEnd();
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}
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}
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void
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ResultSet::writeToStream(string& _s)
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{
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if (this->useStream)
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{
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if(this->stream != NULL)
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this->stream->write(_s.c_str(), _s.length());
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}
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}
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const Bstr*
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ResultSet::getOneRecord()
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{
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if (this->useStream)
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{
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if(this->stream == NULL)
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{
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fprintf(stderr, "ResultSet::getOneRecord(): no results now!\n");
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return NULL;
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}
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if(this->stream->isEnd())
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{
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fprintf(stderr, "ResultSet::getOneRecord(): read till end now!\n");
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return NULL;
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}
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//NOTICE:this is one record, and donot free the memory!
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//NOTICE:Bstr[] but only one element, used as Bstr*
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return this->stream->read();
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}
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else
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{
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return NULL;
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}
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}
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