Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/config/Configuration.java @ 1127:ebeb56428409

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Added license headers and license file. geo-backend/trunk@1261 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:52:22 +0000
parents 1985d5db0feb
children
rev   line source
1127
ebeb56428409 Added license headers and license file.
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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.config;
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10
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11 import de.intevation.gnv.geobackend.base.connectionpool.ConnectionPoolFactory;
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12
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13 import de.intevation.gnv.geobackend.base.query.container.QueryContainerFactory;
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14
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15 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException;
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16
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17 import de.intevation.gnv.geobackend.util.XMLUtils;
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18
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19 import java.io.FileInputStream;
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20 import java.io.FileNotFoundException;
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21 import java.io.IOException;
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22 import java.io.InputStream;
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23
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24 import java.util.Properties;
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25
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26 import javax.xml.xpath.XPathConstants;
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27
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28 import org.apache.log4j.Logger;
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29
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30 import org.w3c.dom.Document;
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31 import org.w3c.dom.Node;
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32 import org.w3c.dom.NodeList;
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33
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34 /**
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35 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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36 */
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37 public final class Configuration {
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38
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39 public static final String CONFIGURATION_ROOT = "geo-backend";
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40 public static final String XPATH_QUERIES = "query-configuration";
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41 public static final String XPATH_BACKEND = "backend-configuration";
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42 public static final String XPATH_CACHE = "cache";
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43 public static final String XPATH_CACHE_ENABLED = "@enabled";
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44 public static final String XPATH_CACHE_CONFIG = "configuration";
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45
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46 private static Logger logger = Logger.getLogger(Configuration.class);
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47
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48 private static Configuration instance;
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49
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50 private Node config;
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51 private String configDir;
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52 private String placeholder;
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53
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54 private boolean cacheEnabled;
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55 private String cacheConfiguration;
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56
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57
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58
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59 /**
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60 * Returns an instance of Configuration.
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61 *
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62 * @return an instance of Configuration.
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63 */
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64 public static Configuration getInstance() {
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65 if (instance == null)
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66 instance = new Configuration();
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67
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68 return instance;
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69 }
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70
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71
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72 /**
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73 * Constructor that creates a new Configuration object with disabled cache.
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74 */
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75 public Configuration() {
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76 cacheEnabled = false;
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77 }
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78
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79
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80 /**
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81 * Initialize the geo-backend before it is ready to be used. This method
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82 * calls other <i>init*</i> methods.
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83 *
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84 * @param conf A configuration document. This document should contain a node
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85 * <i>geo-backend</i>. If there are more nodes named <i>geo-backend</i>, the
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86 * first node is used.
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87 * @param configDir The path to the root configuration directory.
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88 * @param placeholder The placeholder used in the configuration document for
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89 * the root configuration directory.
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90 */
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91 public void init(Document conf, String configDir, String placeholder)
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92 throws QueryContainerException, FileNotFoundException, IOException
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93 {
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94 this.config = conf;
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95 this.configDir = configDir;
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96 this.placeholder = placeholder;
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97
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98 NodeList root = conf.getElementsByTagName(CONFIGURATION_ROOT);
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99 if (root == null || root.getLength() == 0) {
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100 logger.error("No valid configuration for this geobackend given!");
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101 return;
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102 }
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103
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104 initQueries(root.item(0));
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105 initConnection(root.item(0));
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106 initCache(root.item(0));
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107 }
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108
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109
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110 /**
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111 * Initialize sql statements.
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112 *
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113 * @param conf The geo-backend configuration node.
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114 */
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115 protected void initQueries(Node conf)
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116 throws FileNotFoundException, IOException, QueryContainerException
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117 {
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118 String queriesFile = (String) XMLUtils.xpath(
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119 conf, XPATH_QUERIES, XPathConstants.STRING, null);
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120
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121 queriesFile = replaceConfigDir(queriesFile);
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122 logger.info("Initialize queries: " + queriesFile);
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123
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124 Properties queries = getProperties(queriesFile);
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125 QueryContainerFactory qcf = QueryContainerFactory.getInstance();
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126 qcf.initializeQueryContainer(queries);
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127 }
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128
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129
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130 /**
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131 * Initialize necessary objects used for the database connection.
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132 *
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133 * @param connection The geo-backend configuration node.
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134 */
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135 protected void initConnection(Node connection)
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136 throws FileNotFoundException, IOException
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137 {
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138 String config = (String)XMLUtils.xpath(
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139 connection, XPATH_BACKEND, XPathConstants.STRING, null);
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140
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141 config = replaceConfigDir(config);
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142 logger.info("Initialize database connection: " + config);
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143
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144 Properties properties = getProperties(config);
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145 ConnectionPoolFactory cpf = ConnectionPoolFactory.getInstance();
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146 cpf.initializeConnectionPool(properties);
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147 }
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148
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149
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150 /**
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151 * Initialize necessary objects used for the sql cache.
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152 *
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153 * @param conf The geo-backend configuration node.
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154 */
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155 protected void initCache(Node conf) {
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156 Node cache = (Node) XMLUtils.xpath(
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157 conf, XPATH_CACHE, XPathConstants.NODE, null);
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158
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159 String on = (String) XMLUtils.xpath(
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160 cache, XPATH_CACHE_ENABLED, XPathConstants.STRING, null);
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161
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162 boolean enabled = Boolean.parseBoolean(on);
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163
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164 if (enabled) {
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165 String config = (String) XMLUtils.xpath(
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166 cache, XPATH_CACHE_CONFIG, XPathConstants.STRING, null);
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167
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168 if (config != null && config.length() > 0) {
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169 config = replaceConfigDir(config);
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170 logger.info("Initialize sql cache with config: " + config);
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171
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172 this.cacheConfiguration = config;
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173 this.cacheEnabled = true;
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174 }
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175 else {
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176 logger.error("SQL cache is enabled, " +
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177 "but no configuration was found.");
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178 }
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179 }
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180 else {
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181 logger.info("SQL cache is disabled.");
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182 }
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183 }
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184
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185
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186 /**
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187 * Replace placeholder in the configuration. Placeholder are used for the
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188 * base configuration directory.
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189 *
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190 * @param path A string that might contain placeholders.
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191 *
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192 * @return <i>path</i> with replaced placeholder.
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193 */
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194 protected String replaceConfigDir(String path) {
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195 return path.replace(placeholder, configDir);
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196 }
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197
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198
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199 /**
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200 * Read a file that contains properties and return a Java Properties object.
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201 *
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202 * @param path Path to a properties file.
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203 *
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204 * @return the properties contained in the file.
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205 */
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206 protected Properties getProperties(String path)
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207 throws FileNotFoundException, IOException
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208 {
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209 InputStream inputStream = null;
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210
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211 try {
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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212 inputStream = new FileInputStream(path);
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213 Properties properties = new Properties();
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214 properties.load(inputStream);
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215
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216 return properties;
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217 }
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218 finally {
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219 if (inputStream != null) {
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220 try {
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221 inputStream.close();
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222 }
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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223 catch (IOException ioe) {
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224 }
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225 }
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226 }
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227 }
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228
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229
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230 /**
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231 * Returns the state of the cache.
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232 *
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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233 * @return true if sql queries are cache, otherwise false.
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234 */
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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235 public boolean isCacheEnabled() {
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236 return cacheEnabled;
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237 }
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238
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239
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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240 /**
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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241 * Returns the path of the cache configuration file.
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242 *
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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243 * @return configuration path.
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244 */
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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245 public String getCacheConfiguration() {
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246 return cacheConfiguration;
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247 }
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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248 }
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249 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org