Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/aft/WQDiff.java @ 5407:db5def5456ce

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author Andre Heinecke <aheinecke@intevation.de>
date Mon, 25 Mar 2013 17:00:37 +0100
parents f939e1e6cfa4
children
rev   line source
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1 package de.intevation.aft;
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2
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3 import de.intevation.db.ConnectedStatements;
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4 import de.intevation.db.SymbolicStatement;
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5
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6 import java.sql.ResultSet;
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7 import java.sql.SQLException;
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8
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9 import java.util.Collection;
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10 import java.util.Iterator;
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11 import java.util.Set;
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12 import java.util.TreeSet;
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13
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14 public class WQDiff
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15 {
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16 protected Set<WQ> toAdd;
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17 protected Set<WQ> toDelete;
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18
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19 public WQDiff() {
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20 }
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21
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22 public WQDiff(Collection<WQ> a, Collection<WQ> b) {
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23 toAdd = new TreeSet<WQ>(WQ.EPS_CMP);
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24 toDelete = new TreeSet<WQ>(WQ.EPS_CMP);
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25 build(a, b);
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26 }
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27
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28 public void build(Collection<WQ> a, Collection<WQ> b) {
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29 toAdd.addAll(b);
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30 toAdd.removeAll(a);
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31
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32 toDelete.addAll(a);
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33 toDelete.removeAll(b);
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34 }
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35
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36 public void clear() {
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37 toAdd.clear();
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38 toDelete.clear();
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39 }
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40
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41 public Set<WQ> getToAdd() {
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42 return toAdd;
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43 }
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44
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45 public void setToAdd(Set<WQ> toAdd) {
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46 this.toAdd = toAdd;
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47 }
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48
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49 public Set<WQ> getToDelete() {
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50 return toDelete;
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51 }
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52
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53 public void setToDelete(Set<WQ> toDelete) {
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54 this.toDelete = toDelete;
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55 }
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56
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57 public boolean hasChanges() {
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58 return !(toAdd.isEmpty() && toDelete.isEmpty());
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59 }
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60
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61 public void writeChanges(
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62 SyncContext context,
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63 int tableId
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64 )
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65 throws SQLException
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66 {
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67 ConnectedStatements flysStatements = context.getFlysStatements();
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68
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69 // Delete the old entries
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70 if (!toDelete.isEmpty()) {
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71 SymbolicStatement.Instance deleteDTV =
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72 flysStatements.getStatement("delete.discharge.table.value");
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73 for (WQ wq: toDelete) {
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74 deleteDTV
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75 .clearParameters()
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76 .setInt("id", wq.getId())
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77 .execute();
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78 }
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79 }
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80
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81 // Add the new entries.
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82 if (!toAdd.isEmpty()) {
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83 SymbolicStatement.Instance nextId =
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84 flysStatements.getStatement("next.discharge.table.values.id");
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85
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86 SymbolicStatement.Instance insertDTV =
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87 flysStatements.getStatement("insert.discharge.table.value");
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88
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89 // Recycle old ids as much as possible.
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90 Iterator<WQ> oldIds = toDelete.iterator();
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91
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92 // Create ids for new entries.
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93 for (WQ wq: toAdd) {
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94 if (oldIds.hasNext()) {
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95 wq.setId(oldIds.next().getId());
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96 }
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97 else {
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98 ResultSet rs = nextId.executeQuery();
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99 rs.next();
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100 wq.setId(rs.getInt("discharge_table_values_id"));
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101 rs.close();
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102 }
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103 }
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104
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105 // Write the new entries.
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106 for (WQ wq: toAdd) {
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107 insertDTV
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108 .clearParameters()
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109 .setInt("id", wq.getId())
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110 .setInt("table_id", tableId)
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111 .setDouble("w", wq.getW())
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112 .setDouble("q", wq.getQ())
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113 .execute();
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114 }
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115 }
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116 }
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117 }
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118 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org