Mercurial > dive4elements > framework
annotate artifact-database/src/main/java/de/intevation/artifactdatabase/SQL.java @ 129:10d726907419
Bugfix: The artifacts package can be compiled with local modifications again.
artifacts/trunk@1353 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 02 Mar 2011 07:28:20 +0000 |
parents | 933bbc9fc11f |
children | b2115f484edb |
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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.artifactdatabase; |
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10 |
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11 import java.io.IOException; |
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12 import java.io.InputStream; |
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13 |
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14 import java.util.Properties; |
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15 |
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16 import org.apache.log4j.Logger; |
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17 |
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18 /** |
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19 * Singleton to provide SQL statement strings as key/value pairs. |
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20 * This mechanism is used to encapsulate database specific SQL |
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21 * dialects. |
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22 * |
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23 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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24 */ |
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25 public final class SQL |
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26 { |
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27 private static Logger logger = Logger.getLogger(SQL.class); |
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28 |
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29 private SQL() { |
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30 } |
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31 |
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32 private static Properties statements; |
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33 |
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34 /** |
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35 * Returns key/value pairs of SQL statements for the used database |
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36 * backend. |
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37 * The concrete set of SQL statements is determined by the |
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38 * used JDBC database driver which is configured in conf.xml. |
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39 * The class name of the driver is transformed by replacing |
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40 * all '.' with '_' and lower case the resulting string. |
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41 * The transformed string is used to load a properties file |
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42 * in '/sql/' which should contain the statements. |
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43 * Example:<br> |
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44 * <code>org.postgresql.Driver</code> results in loading of |
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45 * <code>/sql/org-postgresql-driver.properties</code>. |
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46 * @return The key/value pairs of SQL statements. |
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47 */ |
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48 public static final synchronized Properties getStatements() { |
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49 if (statements == null) { |
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50 statements = loadStatements(); |
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51 } |
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52 return statements; |
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53 } |
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54 |
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55 private static final Properties loadStatements() { |
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56 String driver = Config.getStringXPath( |
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57 DBConnection.DB_DRIVER, DBConnection.DEFAULT_DRIVER); |
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58 |
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59 Properties properties = new Properties(); |
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60 |
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61 InputStream in = null; |
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62 try { |
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63 String res = "/sql/" + driver.replace('.', '-').toLowerCase() |
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64 + ".properties"; |
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65 in = SQL.class.getResourceAsStream(res); |
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66 |
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67 if (in == null) { |
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68 logger.warn("No SQL file for driver '" + driver + "' found."); |
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69 res = "/sql/" |
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70 + DBConnection.DEFAULT_DRIVER.replace('.', '-') |
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71 .toLowerCase() |
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72 + ".properties"; |
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73 if ((in = SQL.class.getResourceAsStream(res)) == null) { |
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74 logger.error("No SQL file found"); |
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75 } |
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76 } |
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77 |
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78 properties.load(in); |
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79 } |
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80 catch (IOException ioe) { |
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81 logger.error(ioe.getLocalizedMessage(), ioe); |
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82 } |
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83 finally { |
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84 if (in != null) { |
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85 try { in.close(); } catch (IOException ioe) {} |
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86 } |
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87 } |
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88 |
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89 return properties; |
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90 } |
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91 |
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92 /** |
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93 * Returns a particular SQL statement for a given key. |
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94 * @param key The key of the statement. |
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95 * @return The corresponing SQL statement or null if none |
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96 * is found. |
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97 */ |
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98 public static final String get(String key) { |
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99 return getStatements().getProperty(key); |
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100 } |
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101 } |
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102 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |