1 | package project.educatum.service.impl;
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2 |
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3 | import org.springframework.stereotype.Service;
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4 | import project.educatum.model.Listening;
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5 | import project.educatum.model.Payment;
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6 | import project.educatum.model.Teacher;
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7 | import project.educatum.model.exceptions.PaymentNotFoundException;
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8 | import project.educatum.model.exceptions.TeacherNotFoundException;
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9 | import project.educatum.repository.ListeningRepository;
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10 | import project.educatum.repository.PaymentRepository;
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11 | import project.educatum.repository.TeacherRepository;
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12 | import project.educatum.service.*;
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13 |
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14 | import javax.persistence.EntityManager;
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15 | import javax.persistence.PersistenceContext;
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16 | import java.util.ArrayList;
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17 | import java.util.List;
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18 |
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19 | @Service
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20 | public class PaymentServiceImpl implements PaymentService {
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21 |
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22 | private final ListeningService listeningService;
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23 | private final TeacherService teacherService;
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24 | private final TeacherStudentService teacherStudentService;
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25 | private final ClassService classService;
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26 | private final TeacherRepository teacherRepository;
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27 | private final PaymentRepository paymentRepository;
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28 | private final ListeningRepository listeningRepository;
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29 |
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30 | @PersistenceContext
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31 | private EntityManager entityManager;
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32 |
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33 | public PaymentServiceImpl(ListeningService listeningService, TeacherService teacherService, TeacherStudentService teacherStudentService, ClassService classService, TeacherRepository teacherRepository, PaymentRepository paymentRepository, ListeningRepository listeningRepository) {
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34 | this.listeningService = listeningService;
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35 | this.teacherService = teacherService;
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36 | this.teacherStudentService = teacherStudentService;
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37 | this.classService = classService;
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38 | this.teacherRepository = teacherRepository;
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39 | this.paymentRepository = paymentRepository;
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40 | this.listeningRepository = listeningRepository;
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41 | }
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42 |
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43 | @Override
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44 | public void addPayment(Integer teacherID, Integer price, Integer classID, Integer studentID) {
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45 | Teacher teacher = teacherRepository.findById(teacherID).orElseThrow(TeacherNotFoundException::new);
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46 | Integer owes = studentTeacherLoan(studentID, teacher.getId());
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47 | if (owes != 0) {
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48 | List<Listening> listeningList = listeningRepository.findAllByClassAndStudent(classID, studentID);
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49 | Integer paymentID = listeningList.get(0).getIdPayment().getId();
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50 | Payment p = paymentRepository.findById(paymentID).orElseThrow(PaymentNotFoundException::new);
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51 | paymentRepository.updatePrice(price, p.getId());
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52 | }
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53 | }
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54 |
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55 | @Override
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56 | public List<Object[]> getListenedClassesQuery() {
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57 | javax.persistence.Query q = entityManager.createNativeQuery(
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58 | """
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59 | select distinct q3.ucenik1 id_ucenik, q3.id_nastavnik id_nastavnik,
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60 | q3.slusanicasovi slusani_casovi
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61 | from
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62 | (
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63 | select * from
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64 | (
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65 |
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66 | select u.id_ucenik ucenik1, u.ime, n.id_nastavnik nastavnik1, count(s.id_cas || '-' || s.id_slusanje) slusanicasovi
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67 | from project.ucenici u\s
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68 | join project.slusanje s on s.id_ucenik = u.id_ucenik\s
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69 | join project.casovi c on c.id_cas = s.id_cas\s
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70 | join project.nastavnici n on n.id_nastavnik = c.id_nastavnik\s
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71 | group by 1,2,3
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72 | \s
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73 | \s
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74 | \s
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75 | )q1
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76 |
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77 |
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78 | join
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79 | \s
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80 | (
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81 | select c.id_cas,n.id_nastavnik as id_nastavnik,n.ime,s.id_ucenik ucenik2, s.id_slusanje id_slusanje2 from project.casovi c
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82 | join project.slusanje s on s.id_cas=c.id_cas
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83 | join project.nastavnici n on n.id_nastavnik=c.id_nastavnik
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84 | ) q2 on
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85 | q1.ucenik1=q2.ucenik2
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86 | and q1.nastavnik1=q2.id_nastavnik)q3
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87 | """
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88 | );
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89 | return q.getResultList();
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90 | }
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91 |
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92 |
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93 | @Override
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94 | public List<Object[]> getPaymentsQuery() {
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95 | javax.persistence.Query q = entityManager.createNativeQuery(
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96 | """
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97 | select q4.id_nastavnik1 as id_nastavnik,q4.nastavnik,\s
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98 | q4.id_ucenik1 as id_ucenik, q4.ucenik as ime_ucenik, sum(q4.dolzi) as dolzi from (
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99 | \s
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100 | \s
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101 | \s
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102 | \s
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103 | select q3.id_nastavnik1, q3.nastavnik1 || ' ' || q3.nastavnik_prezime1 as nastavnik,
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104 | q3.id_ucenik1,q3.ime_ucenik1 as ucenik, (q3.vkupno_za_plakjanje-q3.plateno) as dolzi
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105 | from
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106 | (
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107 | select * from
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108 | \s
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109 | (
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110 | select n.id_nastavnik as id_nastavnik1,n.ime as nastavnik1, n.prezime nastavnik_prezime1,
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111 | u.id_ucenik as id_ucenik1,u.ime || ' ' || u.prezime ime_ucenik1,
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112 | sum(pl.iznos) as plateno from
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113 | project.nastavnici n\s
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114 | join project.plakjanja pl on pl.id_nastavnik = n.id_nastavnik\s
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115 | join project.casovi c on c.id_nastavnik = pl.id_nastavnik\s
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116 | join project.slusanje s on s.id_cas = c.id_cas\s
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117 | and s.id_plakjanja = pl.id_plakjanja\s
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118 | join project.ucenici u on u.id_ucenik = s.id_ucenik\s
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119 | group by 1,2,3,4
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120 | \s
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121 | ) q1
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122 | \s
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123 | join
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124 |
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125 | (
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126 | select n.id_nastavnik as id_nastavnik2,n.ime as nastavnik2, n.prezime nastavnik_prezime2,
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127 | u2.id_ucenik as id_ucenik2, u2.ime || ' ' || u2.prezime as ime_ucenik2,
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128 | (pn.cena_po_cas * pn.broj_casovi_po_dogovor) vkupno_za_plakjanje from project.ucenici u2
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129 | join project.predava_na pn on pn.id_ucenik = u2.id_ucenik
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130 | join project.nastavnici n on n.id_nastavnik =pn.id_nastavnik
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131 | ) q2
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132 | on q1.id_ucenik1 = q2.id_ucenik2 and q2.id_nastavnik2=q1.id_nastavnik1
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133 | ) q3
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134 | )q4
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135 | group by 1,2,3,4
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136 | order by id_nastavnik\s
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137 |
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138 | \s
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139 | \s
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140 | \s
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141 | """);
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142 |
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143 | return q.getResultList();
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144 | }
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145 |
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146 |
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147 | @Override
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148 | public Integer studentTeacherLoan(Integer studentId, Integer teacherId) {
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149 | List<Object[]> query = getPaymentsQuery();
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150 | List<String> payments = new ArrayList<>();
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151 | StringBuilder sb = new StringBuilder();
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152 | int total = 0;
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153 | for (Object[] payment : query) {
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154 | sb.setLength(0);
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155 | for (int i = 0; i < payment.length; i++) {
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156 | String attribute = payment[i].toString();
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157 | sb.append(attribute).append(" ");
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158 | }
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159 | payments.add(sb.toString());
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160 | }
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161 | for (String p : payments) {
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162 | String[] parts = p.split("\\s+");
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163 | String idTeacher = parts[0];
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164 | String studentID = parts[3];
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165 | String owes = parts[6];
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166 | if (Integer.valueOf(studentID).equals(studentId)
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167 | && Integer.valueOf(idTeacher).equals(teacherId)) {
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168 | total += Integer.parseInt(owes);
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169 | }
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170 | }
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171 | if (total < 0) total = 0;
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172 | return total;
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173 | }
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174 |
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175 | @Override
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176 | public Integer numListenedClasses(Integer idStudent, Integer idTeacher) {
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177 | int total = 0;
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178 | List<Object[]> query = getListenedClassesQuery();
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179 | List<String> listeningList = new ArrayList<>();
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180 | StringBuilder sb = new StringBuilder();
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181 | for (Object[] l : query) {
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182 | sb.setLength(0);
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183 | for (int i = 0; i < l.length; i++) {
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184 | String attribute = l[i].toString();
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185 | sb.append(attribute).append(" ");
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186 | }
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187 | listeningList.add(sb.toString());
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188 | }
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189 | for (String s : listeningList) {
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190 | String[] parts = s.split("\\s+");
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191 | String idU = parts[0];
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192 | String idN = parts[1];
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193 | String numClasses = parts[2];
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194 | if (Integer.valueOf(idU).equals(idStudent) && Integer.valueOf(idN).equals(idTeacher))
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195 | total += Integer.parseInt(numClasses);
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196 | }
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197 | if (total < 0) total = 0;
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198 | return total;
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199 | }
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200 |
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201 | }
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