Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/db/Statements.java @ 5042:70650981a54d

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author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 20 Feb 2013 10:56:38 +0100
parents f939e1e6cfa4
children
rev   line source
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21e49e0a2307 Add infrastructure to load SQL statements for databases.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.db;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5
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6 import java.util.Enumeration;
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7 import java.util.HashMap;
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8 import java.util.Map;
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9 import java.util.Properties;
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10
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11 import org.apache.log4j.Logger;
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12
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13 public class Statements
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14 {
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15 private static Logger log = Logger.getLogger(Statements.class);
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16
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17 public static final String RESOURCE_PATH = "/sql/";
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18 public static final String COMMON_PROPERTIES = "-common.properties";
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19
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20 protected String type;
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21 protected String driver;
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22
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23 protected Map<String, SymbolicStatement> statements;
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24
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25 public Statements(String type, String driver) {
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26 this.type = type;
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27 this.driver = driver;
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28 }
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29
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30 public SymbolicStatement getStatement(String key) {
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31 return getStatements().get(key);
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32 }
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33
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34 public Map<String, SymbolicStatement> getStatements() {
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35 if (statements == null) {
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36 statements = loadStatements();
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37 }
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38 return statements;
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39 }
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40
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41 protected Map<String, SymbolicStatement> loadStatements() {
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42 Map<String, SymbolicStatement> statements =
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43 new HashMap<String, SymbolicStatement>();
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44
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45 Properties properties = loadProperties();
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46
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47 for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements();) {
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48 String key = (String)e.nextElement();
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49 String value = properties.getProperty(key);
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50 SymbolicStatement symbolic = new SymbolicStatement(value);
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51 statements.put(key, symbolic);
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52 }
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53
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54 return statements;
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55 }
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56
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57 protected String driverToProperties() {
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58 return
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59 type + "-" +
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60 driver.replace('.', '-').toLowerCase() + ".properties";
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61 }
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62
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63 protected Properties loadCommon() {
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64 Properties common = new Properties();
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65
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66 String path = RESOURCE_PATH + type + COMMON_PROPERTIES;
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67
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68 InputStream in = Statements.class.getResourceAsStream(path);
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69
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70 if (in != null) {
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71 try {
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72 common.load(in);
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73 }
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74 catch (IOException ioe) {
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75 log.error("cannot load defaults: " + path, ioe);
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76 }
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77 finally {
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78 try {
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79 in.close();
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80 }
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81 catch (IOException ioe) {
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82 }
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83 }
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84 }
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85 else {
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86 log.warn("cannot find: " + path);
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87 }
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88
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89 return common;
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90 }
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91
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92 protected Properties loadProperties() {
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93
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94 Properties common = loadCommon();
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95
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96 Properties properties = new Properties(common);
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97
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98 String path = RESOURCE_PATH + driverToProperties();
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99
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100 InputStream in = Statements.class.getResourceAsStream(path);
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101
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102 if (in != null) {
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103 try {
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104 properties.load(in);
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105 }
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106 catch (IOException ioe) {
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107 log.error("cannot load statements: " + path, ioe);
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108 }
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109 finally {
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110 try {
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111 in.close();
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112 }
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113 catch (IOException ioe) {
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114 }
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115 }
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116 }
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117 else {
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118 log.warn("cannot find: " + path);
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119 }
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120
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121 return properties;
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122 }
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123 }
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124 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org