Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/themes/ThemeFactory.java @ 6931:2c8e5bad8699

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Fix NPE in case the artifact does not even have the master attribute Started happening with the new other.wqkms.w attribute condition and official lines in waterlevel calculations
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 27 Aug 2013 18:35:51 +0200
parents af13ceeba52a
children e4606eae8ea5
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.themes;
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10
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11 import org.dive4elements.artifacts.common.utils.XMLUtils;
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12 import org.dive4elements.river.artifacts.D4EArtifact;
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13 import org.dive4elements.river.artifacts.context.RiverContext;
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14
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15 import java.util.ArrayList;
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16 import java.util.HashMap;
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17 import java.util.List;
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18 import java.util.Map;
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19
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20 import javax.xml.xpath.XPathConstants;
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21
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22 import org.apache.log4j.Logger;
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23 import org.w3c.dom.Document;
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24 import org.w3c.dom.Element;
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25 import org.w3c.dom.NamedNodeMap;
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26 import org.w3c.dom.Node;
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27 import org.w3c.dom.NodeList;
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28
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29 /**
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 *
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32 * Mapping-matching rules:
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33 *
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34 */
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35 public class ThemeFactory {
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36
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37 private static Logger logger = Logger.getLogger(ThemeFactory.class);
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38
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39 /** Trivial, hidden constructor. */
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40 private ThemeFactory() {
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41 }
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42
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43
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44 /**
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45 * Creates a new theme from <i>config</i>.
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46 *
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47 * @param themeCfg The theme config document that is used to fetch parent
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48 * themes.
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49 * @param config The theme config node.
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50 *
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51 * @return a new theme.
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52 */
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53 public static Theme createTheme(Document themeCfg, Node config) {
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54 String name = getName(config);
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55 String desc = getDescription(config);
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56
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57 logger.debug("Create new theme: " + name);
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58
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59 Theme theme = new DefaultTheme(name, desc);
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60
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61 parseInherits(themeCfg, config, theme);
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62 parseFields(config, theme);
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63 parseAttrs(config, theme);
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64
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65 return theme;
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66 }
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67
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68
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69 /**
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70 * Get first matching theme for facet.
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71 *
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72 * @param name Name to match "from" of theme mapping.
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73 * @param pattern String to 'compare' to pattern in mapping.
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74 * @param output Name of the current output
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75 *
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76 * @return First matching theme.
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77 */
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78 public static Theme getTheme(
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79 RiverContext c,
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80 String name,
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81 String pattern,
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82 String output,
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83 String groupName)
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84 {
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85 if (logger.isDebugEnabled()) {
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86 logger.debug(
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87 "Search theme for: " + name + " - pattern: " + pattern);
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88 }
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89
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90 if (c == null || name == null) {
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91 logger.warn("Cannot search for theme.");
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92 return null;
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93 }
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94
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95 // Fetch mapping and themes.
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96 @SuppressWarnings("unchecked")
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97 Map<String, List<ThemeMapping>> map = (Map<String, List<ThemeMapping>>)
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98 c.get(RiverContext.THEME_MAPPING);
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99
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100 @SuppressWarnings("unchecked")
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101 List<ThemeGroup> tgs = (List<ThemeGroup>)
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102 c.get(RiverContext.THEMES);
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103
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104 ThemeGroup group = null;
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105 for (ThemeGroup tg: tgs) {
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106 if (tg.getName().equals(groupName)) {
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107 group = tg;
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108 break;
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109 }
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110 }
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111
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112 if (group == null) {
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113 logger.warn("No theme group found: '" + groupName + "'");
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114 return null;
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115 }
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116
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117 Map<String, Theme> t = group.getThemes();
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118
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119 D4EArtifact artifact = (D4EArtifact) c.get(RiverContext.ARTIFACT_KEY);
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120
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121 if (map == null || map.isEmpty() || t == null || t.isEmpty()) {
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122 logger.warn("No mappings or themes found. Cannot retrieve theme!");
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123 return null;
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124 }
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125
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126 List<ThemeMapping> mapping = map.get(name);
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127
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128 if (mapping == null) {
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129 logger.warn("No theme found for mapping: " + name);
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130 return null;
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131 }
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132
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133 // Take first mapping of which all conditions are satisfied.
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134 for (ThemeMapping tm: mapping) {
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135 if (name.equals(tm.getFrom())
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136 && tm.applyPattern(pattern)
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137 && tm.masterAttrMatches(artifact)
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138 && tm.outputMatches(output))
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139 {
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140 String target = tm.getTo();
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141
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142 logger.debug("Found theme '" + target + "'");
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143 return t.get(target);
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144 }
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145 }
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146
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147 String msg =
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148 "No theme found for '" + name +
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149 "' with pattern '" + pattern + "' and output " + output + ".";
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150
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151 logger.warn(msg);
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152
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153 return null;
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154 }
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155
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156
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157 @SuppressWarnings("unchecked")
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158 public static List<ThemeGroup> getThemeGroups(RiverContext c) {
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159 List<ThemeGroup> tgs = (List<ThemeGroup>)
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160 c.get(RiverContext.THEMES);
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161 return tgs;
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162 }
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163
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164
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165 @SuppressWarnings("unchecked")
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166 public static List<Theme> getThemes (RiverContext c, String name) {
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167 List<ThemeGroup> tgs = (List<ThemeGroup>)
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168 c.get(RiverContext.THEMES);
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169 if (tgs == null) {
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170 return null;
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171 }
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172
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173 List<Theme> themes = new ArrayList<Theme>();
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174 for (ThemeGroup tg: tgs) {
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175 themes.add(tg.getThemeByName(name));
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176 }
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177 return themes;
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178 }
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179
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180 protected static String getName(Node config) {
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181 return ((Element)config).getAttribute("name");
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182 }
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183
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184
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185 protected static String getDescription(Node config) {
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186 return ((Element)config).getAttribute("desc");
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187 }
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188
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189
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190 protected static void parseInherits(Document themeCfg, Node cfg, Theme t) {
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191 parseInherits(themeCfg, cfg, t, null);
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192 }
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193
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194 protected static void parseInherits(
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195 Document themeCfg,
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196 Node cfg,
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197 Theme t,
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198 Map<String, Node> themes
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199 ) {
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200 logger.debug("ThemeFactory.parseInherits");
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201
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202 NodeList inherits = ((Element)cfg).getElementsByTagName("inherit");
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203
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204 int num = inherits.getLength();
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205
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206 if (num == 0) {
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207 logger.debug("Theme does not inherit from other themes.");
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208 return;
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209 }
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210
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211 logger.debug("Theme inherits from " + num + " other themes.");
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212
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213 if (themes == null) {
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214 themes = buildThemeMap(themeCfg);
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215 }
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216
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217 for (int i = 0; i < num; i++) {
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218 Node inherit = inherits.item(i);
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219 String from = ((Element)inherit).getAttribute("from");
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220
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221 Node tmp = themes.get(from);
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222
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223 parseInherits(themeCfg, tmp, t, themes);
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224 parseFields(tmp, t);
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225 }
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226 }
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227
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228 protected static Map<String, Node> buildThemeMap(Document themeCfg) {
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229 Map<String, Node> map = new HashMap<String, Node>();
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230 String xpath = "/themes/themegroup/theme";
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231
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232 NodeList nodes = (NodeList)XMLUtils.xpath(
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233 themeCfg, xpath, XPathConstants.NODESET);
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234
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235 if (nodes != null) {
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236 for (int i = 0, N = nodes.getLength(); i < N; ++i) {
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237 Node node = nodes.item(i);
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238 String name = ((Element)node).getAttribute("name");
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239 map.put(name, node);
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240 }
340
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241 }
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242 return map;
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243 }
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244
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245
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246 protected static void parseFields(Node config, Theme theme) {
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247 if (config == null || theme == null) {
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248 logger.warn("Parsing fields without node or theme is senseless!");
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249 return;
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250 }
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251
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252 NodeList fields = ((Element)config).getElementsByTagName("field");
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253
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254 int num = fields.getLength();
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255
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256 logger.debug("Found " + num + " own fields in this theme.");
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257
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258 if (num == 0) {
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259 logger.debug("Theme has no own fields.");
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260 return;
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261 }
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262
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263 for (int i = 0; i < num; i++) {
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264 Node field = fields.item(i);
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265
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266 addField(theme, field);
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267 }
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268 }
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269
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270
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271 protected static void addField(Theme theme, Node field) {
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272 String name = ((Element)field).getAttribute("name");
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273
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274 logger.debug("Add field " + name + " to theme " + theme.getName());
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275
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276 NamedNodeMap attrs = field.getAttributes();
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277
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278 int num = attrs != null ? attrs.getLength() : 0;
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279
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280 if (num == 0) {
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281 logger.warn("This field has no attributes.");
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282 return;
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283 }
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284
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285 ThemeField theField = new DefaultThemeField(name);
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286
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287 for (int i = 0; i < num; i++) {
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288 Node attr = attrs.item(i);
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289
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290 String key = attr.getNodeName();
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291 String value = attr.getNodeValue();
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292
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293 theField.setAttribute(key, value);
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294 }
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295
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296 theme.addField(name, theField);
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297 }
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298
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299
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300 protected static void parseAttrs(Node config, Theme theme) {
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301 NamedNodeMap attrs = config.getAttributes();
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302
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303 int num = attrs != null ? attrs.getLength() : 0;
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304
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305 if (num == 0) {
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306 logger.debug("Theme has no attributes set.");
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307 return;
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308 }
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309
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310 for (int i = 0; i < num; i++) {
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311 Node attr = attrs.item(i);
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312
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313 String name = attr.getNodeName();
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314 String value = attr.getNodeValue();
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315
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316 theme.addAttribute(name, value);
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317 }
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318 }
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319 }
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320 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org