Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 1631:26e19cdaed5e

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Improved database session handling in services and artifacts. flys-artifacts/trunk@2807 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 22 Sep 2011 10:07:22 +0000
parents b1ed0ec0236f
children e92bc9b0ca1d
rev   line source
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.math.BigDecimal;
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4 import java.util.Iterator;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10
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11 import de.intevation.artifacts.CallMeta;
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12 import de.intevation.artifacts.GlobalContext;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.XMLUtils;
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16
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17 import de.intevation.flys.model.Annotation;
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18 import de.intevation.flys.model.Attribute;
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19 import de.intevation.flys.model.Position;
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20 import de.intevation.flys.model.Range;
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21 import de.intevation.flys.model.Edge;
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22
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23 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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24
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25 import de.intevation.flys.artifacts.cache.CacheFactory;
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26
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27 import net.sf.ehcache.Cache;
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29 /**
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30 * This service provides information about distances of a specified river.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class DistanceInfoService extends FLYSService {
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36 private static enum DistanceFilter {
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37 NONE, LOCATIONS, DISTANCES
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38 }
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39
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40 /** The logger used in this service. */
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41 private static Logger logger = Logger.getLogger(DistanceInfoService.class);
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42
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43 public static final String CACHE_NAME = "service-distanceinfo";
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45 public static final String RIVER_XPATH = "/art:river/text()";
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46
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47 public static final String FILTER_XPATH = "/art:river/art:filter/text()";
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49
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50 /**
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51 * The default constructor.
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52 */
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53 public DistanceInfoService() {
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54 }
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56
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57 @Override
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58 public Document doProcess(
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59 Document data,
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60 GlobalContext globalContext,
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61 CallMeta callMeta
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62 ) {
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63 logger.debug("DistanceInfoService.process");
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64
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65 String river = XMLUtils.xpathString(
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66 data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE);
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67
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68 String filter = XMLUtils.xpathString(
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69 data, FILTER_XPATH, ArtifactNamespaceContext.INSTANCE);
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70
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71 if (river == null || (river = river.trim()).length() == 0) {
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72 logger.warn("No river specified. Cannot return distance info!");
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73 return XMLUtils.newDocument();
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74 }
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75
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76 logger.debug("Search distances for river: " + river);
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77
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78 Cache cache = CacheFactory.getCache(CACHE_NAME);
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79
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80 if (cache == null) {
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81 logger.debug("no cache configured for distance info");
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82 return getUncached(river, filter);
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83 }
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86 String key = getCacheKey(river, filter);
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87
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88 net.sf.ehcache.Element element = cache.get(key);
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89
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90 if (element != null) {
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91 logger.debug("distance info found in cache");
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92 return (Document)element.getValue();
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93 }
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94
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95 Document result = getUncached(river, filter);
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96
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97 element = new net.sf.ehcache.Element(key, result);
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98
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99 logger.debug("store distance info found into cache");
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100
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101 cache.put(element);
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102
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103 return result;
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104 }
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105
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107 protected String getCacheKey(String river, String filtertype) {
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108 return filtertype != null && filtertype.length() > 0
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109 ? river + "_" + filtertype
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110 : river;
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111 }
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114 protected Document getUncached(String river, String filtertype) {
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115
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116 Document result = XMLUtils.newDocument();
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117
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118 Iterator<Annotation> iter =
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119 AnnotationsFactory.getAnnotationsIterator(river);
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120
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121 Element all = result.createElement("distances");
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122
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123 DistanceFilter filter = getDistanceFilter(filtertype);
314
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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124
1631
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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125 while (iter.hasNext()) {
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126 Annotation a = iter.next();
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127 Element distance = buildDistanceNode(result, a, filter);
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128
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129 if (distance != null) {
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130 all.appendChild(distance);
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131 }
301
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132 }
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133
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134 result.appendChild(all);
301
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135
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136 return result;
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137 }
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138
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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139
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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140 protected static DistanceFilter getDistanceFilter(String type) {
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141 if (type.equals("locations")) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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142 logger.debug("Found 'location' filter.");
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143 return DistanceFilter.LOCATIONS;
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144 }
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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145 else if (type.equals("distances")) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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146 logger.debug("Found 'distances' filter.");
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147 return DistanceFilter.DISTANCES;
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148 }
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parents: 704
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149
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150 logger.debug("Do not use any filter at all.");
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151
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152 return DistanceFilter.NONE;
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153 }
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parents: 704
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154
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155
301
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parents:
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156 /**
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
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157 * Builds an Element for a distance info.
301
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158 *
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159 * @param anno The Annotation that provides information about the distance.
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160 *
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161 * @return an Element that contains information about a distance.
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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162 */
686
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163 protected static Element buildDistanceNode(
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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164 Document document,
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165 Annotation anno,
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166 DistanceFilter filter
686
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167 ) {
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168 Position pos = anno.getPosition();
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169 Range range = anno.getRange();
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170 Attribute attr = anno.getAttribute();
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171 Edge edge = anno.getEdge();
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172 BigDecimal a = range.getA();
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173 BigDecimal b = range.getB();
301
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174
922
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175 if (b == null && filter == DistanceFilter.DISTANCES) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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176 return null;
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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177 }
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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178
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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179 if (b != null && filter == DistanceFilter.LOCATIONS) {
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180 return null;
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 704
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181 }
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182
686
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183 Element distance = document.createElement("distance");
301
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184
686
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185 distance.setAttribute("description", pos.getValue());
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186
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187 String riverSide = attr.getValue();
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188
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189 if (riverSide != null && riverSide.length() > 0) {
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190 distance.setAttribute("riverside", riverSide);
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191 }
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192
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193 if (a != null) {
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194 distance.setAttribute("from", a.toString());
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195 }
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196 if (b != null) {
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197 distance.setAttribute("to", b.toString());
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198 }
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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199 if (edge != null) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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200 BigDecimal bottom = edge.getBottom();
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diff changeset
201 BigDecimal top = edge.getTop();
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
202 if (bottom != null) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 644
diff changeset
203 distance.setAttribute("bottom", bottom.toString());
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parents: 644
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204 }
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 644
diff changeset
205 if (top != null) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 644
diff changeset
206 distance.setAttribute("top", top.toString());
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 644
diff changeset
207 }
3dc61e00385e Merged with trunk and introduced hashing of computed values.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 644
diff changeset
208 }
301
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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209
1a00cb4998a8 Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
210 return distance;
1a00cb4998a8 Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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211 }
1a00cb4998a8 Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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212 }
1a00cb4998a8 Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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213 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org