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annotate flys-aft/src/main/java/de/intevation/db/Statements.java @ 4074:100c4e0a45e1

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Improved infrastructure for prepared statements. flys-aft/trunk@3407 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 13 Dec 2011 14:32:55 +0000
parents 2c70fae83d0c
children 79bb64f66c74
rev   line source
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21e49e0a2307 Add infrastructure to load SQL statements for databases.
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1 package de.intevation.db;
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2
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3 import java.util.Properties;
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4
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5 import java.io.IOException;
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6 import java.io.InputStream;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import java.util.Map;
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11 import java.util.HashMap;
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12 import java.util.Enumeration;
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13
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14 public class Statements
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15 {
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16 private static Logger log = Logger.getLogger(Statements.class);
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17
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18 public static final String RESOURCE_PATH = "/sql/";
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19 public static final String COMMON_PROPERTIES = "-common.properties";
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20
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21 protected String type;
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22 protected String driver;
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23
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24 protected Map<String, SymbolicStatement> statements;
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25
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26 public Statements(String type, String driver) {
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27 this.type = type;
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28 this.driver = driver;
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29 }
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30
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31 public SymbolicStatement getStatement(String key) {
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32 return getStatements().get(key);
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33 }
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34
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35 public Map<String, SymbolicStatement> getStatements() {
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36 if (statements == null) {
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37 statements = loadStatements();
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38 }
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39 return statements;
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40 }
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41
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42 protected Map<String, SymbolicStatement> loadStatements() {
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43 Map<String, SymbolicStatement> statements =
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44 new HashMap<String, SymbolicStatement>();
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45
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46 Properties properties = loadProperties();
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47
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48 for (Enumeration e = properties.propertyNames(); e.hasMoreElements();) {
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49 String key = (String)e.nextElement();
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50 String value = properties.getProperty(key);
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51 SymbolicStatement symbolic = new SymbolicStatement(value);
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52 statements.put(key, symbolic);
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53 }
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54
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55 return statements;
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56 }
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57
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58 protected String driverToProperties() {
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59 return
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60 type + "-" +
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61 driver.replace('.', '-').toLowerCase() + ".properties";
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62 }
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63
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64 protected Properties loadCommon() {
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65 Properties common = new Properties();
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66
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67 String path = RESOURCE_PATH + type + COMMON_PROPERTIES;
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68
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69 InputStream in = Statements.class.getResourceAsStream(path);
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70
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71 if (in != null) {
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72 try {
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73 common.load(in);
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74 }
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75 catch (IOException ioe) {
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76 log.error("cannot load defaults: " + path, ioe);
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77 }
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78 finally {
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79 try {
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80 in.close();
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81 }
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82 catch (IOException ioe) {
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83 }
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84 }
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85 }
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86 else {
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87 log.warn("cannot find: " + path);
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88 }
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89
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90 return common;
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91 }
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92
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93 protected Properties loadProperties() {
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94
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95 Properties common = loadCommon();
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96
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97 Properties properties = new Properties(common);
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98
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99 String path = RESOURCE_PATH + driverToProperties();
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100
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101 InputStream in = Statements.class.getResourceAsStream(path);
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102
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103 if (in != null) {
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104 try {
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105 properties.load(in);
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106 }
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107 catch (IOException ioe) {
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108 log.error("cannot load statements: " + path, ioe);
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109 }
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110 finally {
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111 try {
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112 in.close();
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113 }
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114 catch (IOException ioe) {
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115 }
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116 }
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117 }
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118 else {
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119 log.warn("cannot find: " + path);
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120 }
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121
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122 return properties;
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123 }
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124 }
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125 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org