Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorBase.java @ 886:8b442223741c

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Ordered imports. Removed empty headers. geo-backend/trunk@856 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 29 Mar 2010 09:22:07 +0000
parents 1c3efbd2fc5a
children b757def3ff55
rev   line source
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5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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1 package de.intevation.gnv.geobackend.base.query;
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2
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3 import de.intevation.gnv.geobackend.base.DefaultResult;
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4 import de.intevation.gnv.geobackend.base.DefaultResultDescriptor;
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5 import de.intevation.gnv.geobackend.base.Result;
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6 import de.intevation.gnv.geobackend.base.ResultDescriptor;
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7
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8 import java.sql.ResultSet;
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9 import java.sql.ResultSetMetaData;
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10 import java.sql.SQLException;
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11
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12 import java.util.ArrayList;
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13 import java.util.Collection;
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14 import java.util.List;
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15
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16 /**
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17 * This is an abstract Basicimplementation of the Interface
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18 * QueryExecutor providing several Helpermethods.
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19 * @author Tim Englich <tim.englich@intevation.de>
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20 *
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21 */
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22 public abstract class QueryExecutorBase implements QueryExecutor {
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23
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24 /**
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25 * Constructor
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26 */
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27 public QueryExecutorBase() {
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28 super();
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29 }
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31 /**
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32 * This Method puts the Filtervalues into the Querystring
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33 * @param queryString the Query which should be manipulated
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34 * @param filter the values which should be put into the Query
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35 * @return the manipulated Query
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36 */
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37 protected String setFilterValues(String queryString, String[] filter){
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38 String returnValue = queryString;
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39 for (int i = 0; i < filter.length; i++){
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40 returnValue = returnValue.replaceFirst("[?]", filter[i]);
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41 }
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42 return returnValue;
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43 }
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45 /**
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46 * This Methods converts the ResultSet into an Collection of Result-objects
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47 * @param resultSet the ResultSet which should be converted
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48 * @return an Collection containing Result-Objects
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49 * @throws SQLException
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50 */
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51 protected Collection<Result> createResultCollection(ResultSet resultSet) throws SQLException{
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52 Collection<Result> returnValue = new ArrayList<Result>();
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54 ResultDescriptor resultDescriptor = null;
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55 int columns = -1;
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56
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57 List<String> columnNames = null;
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59 while (resultSet.next()){
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60 if (resultDescriptor == null){
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61 resultDescriptor = new DefaultResultDescriptor();
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62 ResultSetMetaData rsmd = resultSet.getMetaData();
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63 columns = rsmd.getColumnCount();
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65 for (int i = 1; i <= columns; i++){
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66 resultDescriptor.addColumn(rsmd.getColumnName(i), rsmd.getColumnClassName(i));
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67 }
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68 }
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70 Result result = convertResult(resultSet, resultDescriptor);
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72 returnValue.add(result);
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73 }
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74 return returnValue;
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75 }
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77 /**
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78 * This Method converts one Singel ResultSetEntry into an Result-Object
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79 * @param resultSet the ResultSet where the Entry should be took from.
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80 * @param resultDescriptor the ResultsetDescriptor which describes the Entry
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81 * @return an new Result-Objects containing the Values of the ResultSet-Entry
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82 * @throws SQLException
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83 */
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84 private Result convertResult(ResultSet resultSet, ResultDescriptor resultDescriptor)
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85 throws SQLException {
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87 Result result = new DefaultResult(resultDescriptor);
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88
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89 for (int i = 0, N = resultDescriptor.getColumnCount(); i < N; i++) {
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90 result.addColumnValue(i, resultSet.getObject(i+1));
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91 }
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92 return result;
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93 }
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94
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95 public Collection<Result> cachedResults(String query) {
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96 return null;
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97 }
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98
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99 public void cacheResults(String query, Collection<Result> result) {
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100 }
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102 }
http://dive4elements.wald.intevation.org