Mercurial > dive4elements > gnv-client
annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorBase.java @ 1145:dfe1ac687c7f tip
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author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Fri, 28 Sep 2012 12:16:15 +0200 |
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1 /* |
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2 * Copyright (c) 2010 by Intevation GmbH |
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3 * |
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4 * This program is free software under the LGPL (>=v2.1) |
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5 * Read the file LGPL.txt coming with the software for details |
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6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
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7 */ |
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8 |
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9 package de.intevation.gnv.geobackend.base.query; |
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10 |
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11 import java.sql.ResultSet; |
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12 import java.sql.ResultSetMetaData; |
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13 import java.sql.SQLException; |
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14 import java.util.ArrayList; |
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15 import java.util.Collection; |
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16 import java.util.List; |
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17 |
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18 import de.intevation.gnv.geobackend.base.DefaultResult; |
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19 import de.intevation.gnv.geobackend.base.DefaultResultDescriptor; |
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20 import de.intevation.gnv.geobackend.base.Result; |
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21 import de.intevation.gnv.geobackend.base.ResultDescriptor; |
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22 |
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23 /** |
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24 * This is an abstract Basicimplementation of the Interface |
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25 * QueryExecutor providing several Helpermethods. |
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26 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a> |
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27 * |
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28 */ |
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29 public abstract class QueryExecutorBase implements QueryExecutor { |
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30 |
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31 /** |
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32 * Constructor |
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33 */ |
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34 public QueryExecutorBase() { |
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35 super(); |
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36 } |
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37 |
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38 /** |
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39 * This Method puts the Filtervalues into the Querystring |
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40 * @param queryString the Query which should be manipulated |
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41 * @param filter the values which should be put into the Query |
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42 * @return the manipulated Query |
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43 */ |
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44 protected String setFilterValues(String queryString, String[] filter){ |
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45 String returnValue = queryString; |
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46 for (int i = 0; i < filter.length; i++){ |
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47 returnValue = returnValue.replaceFirst("[?]", filter[i]); |
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48 } |
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49 return returnValue; |
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50 } |
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51 |
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52 /** |
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53 * This Methods converts the ResultSet into an Collection of Result-objects |
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54 * @param resultSet the ResultSet which should be converted |
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55 * @return an Collection containing Result-Objects |
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56 * @throws SQLException |
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57 */ |
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58 protected Collection<Result> createResultCollection(ResultSet resultSet) throws SQLException{ |
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59 Collection<Result> returnValue = new ArrayList<Result>(); |
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60 |
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61 ResultDescriptor resultDescriptor = null; |
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62 int columns = -1; |
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63 |
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64 List<String> columnNames = null; |
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65 |
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66 while (resultSet.next()){ |
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67 if (resultDescriptor == null){ |
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68 resultDescriptor = new DefaultResultDescriptor(); |
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69 ResultSetMetaData rsmd = resultSet.getMetaData(); |
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70 columns = rsmd.getColumnCount(); |
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71 |
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72 for (int i = 1; i <= columns; i++){ |
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73 resultDescriptor.addColumn(rsmd.getColumnName(i), rsmd.getColumnClassName(i)); |
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74 } |
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75 } |
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76 |
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77 Result result = convertResult(resultSet, resultDescriptor); |
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79 returnValue.add(result); |
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80 } |
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81 return returnValue; |
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82 } |
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83 |
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84 /** |
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85 * This Method converts one Singel ResultSetEntry into an Result-Object |
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86 * @param resultSet the ResultSet where the Entry should be took from. |
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87 * @param resultDescriptor the ResultsetDescriptor which describes the Entry |
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88 * @return an new Result-Objects containing the Values of the ResultSet-Entry |
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89 * @throws SQLException |
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90 */ |
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91 private Result convertResult(ResultSet resultSet, ResultDescriptor resultDescriptor) |
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92 throws SQLException { |
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93 |
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94 Result result = new DefaultResult(resultDescriptor); |
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95 |
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96 for (int i = 0, N = resultDescriptor.getColumnCount(); i < N; i++) { |
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97 result.addColumnValue(i, resultSet.getObject(i+1)); |
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98 } |
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99 return result; |
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100 } |
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101 |
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102 public Collection<Result> cachedResults(String query) { |
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103 return null; |
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104 } |
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105 |
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106 public void cacheResults(String query, Collection<Result> result) { |
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107 } |
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108 |
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109 public void clearCache(String[] tableNames) { |
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110 } |
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112 } |