Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MetaDataService.java @ 948:0881cd4be773

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Improved error handling in loading meta data template. flys-artifacts/trunk@2364 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Jul 2011 17:01:10 +0000
parents db8d93cb65fd
children 22bc87a42a0d
rev   line source
372
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.io.InputStream;
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4 import java.io.IOException;
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5 import java.io.File;
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6 import java.io.FileInputStream;
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7
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8 import java.sql.Connection;
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9 import java.sql.SQLException;
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10
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11 import org.w3c.dom.Document;
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12
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13 import org.apache.log4j.Logger;
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14
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15 import java.util.Map;
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16 import java.util.HashMap;
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17
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18 import de.intevation.artifacts.CallMeta;
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19 import de.intevation.artifacts.ServiceFactory;
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20
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21 import de.intevation.artifactdatabase.DefaultService;
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22
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23 import de.intevation.artifacts.common.utils.Config;
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24 import de.intevation.artifacts.common.utils.XMLUtils;
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25
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26 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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27
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28 import de.intevation.flys.artifacts.services.meta.Builder;
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29
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30 import de.intevation.flys.backend.SessionHolder;
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31
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32 import org.hibernate.Session;
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33
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34 import org.hibernate.jdbc.Work;
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35
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36 public class MetaDataService
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37 extends DefaultService
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38 {
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39 private static Logger log = Logger.getLogger(MetaDataService.class);
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40
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41 public static final String XPATH_META_DATA_TEMPLATE =
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42 "/artifact-database/metadata/@template";
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43
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44 public static final String XPATH_RIVER = "/art:river/text()";
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45
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46 protected Builder builder;
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47
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48 public MetaDataService() {
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49 }
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50
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51 protected static Map<String, Object> extractParameters(Document data) {
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52 HashMap<String, Object> parameters = new HashMap<String, Object>();
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53
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54 String river = XMLUtils.xpathString(
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55 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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56
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57 if (river == null || (river = river.trim()).length() == 0) {
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58 river = "%"; // matches all rivers
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59 }
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60
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61 parameters.put("river", river);
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62
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63 return parameters;
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64 }
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65
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66 @Override
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67 public Document process(
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68 Document data,
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69 Object globalContext,
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70 CallMeta callMeta
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71 ) {
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72 log.debug("MetaDataService.process");
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73
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74 final Document result = XMLUtils.newDocument();
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75
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76 if (builder == null) {
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77 log.error("MetaDataService is not setup properly.");
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78 return result;
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79 }
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80
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81 final Map<String, Object> parameters = extractParameters(data);
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82
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83 Session session = SessionHolder.acquire();
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84 try {
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85 session.doWork(new Work() {
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86 @Override
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87 public void execute(Connection connection)
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88 throws SQLException
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89 {
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90 log.debug("MetaDataService.execute");
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91 builder.build(connection, result, parameters);
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92 }
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93 });
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94 }
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95 finally {
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96 session.close();
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97 SessionHolder.release();
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98 }
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99
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100 return result;
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101 }
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102
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103 @Override
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104 public void setup(ServiceFactory factory, Object globalContext) {
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105 log.debug("MetaDataService.setup");
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106
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107 String path = Config.getStringXPath(XPATH_META_DATA_TEMPLATE);
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108
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109 if (path == null) {
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110 log.error("no path to template file given");
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111 return;
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112 }
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113
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114 path = Config.replaceConfigDir(path);
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115
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116 File file = new File(path);
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117
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118 if (!file.isFile() || !file.canRead()) {
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119 log.error("Cannot open template file '" + file + "'");
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120 return;
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121 }
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122
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123 InputStream in = null;
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124
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125 try {
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126 in = new FileInputStream(file);
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127 Document template = XMLUtils.parseDocument(in);
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128 if (template == null) {
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129 log.error("cannot parse meta data template");
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130 }
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131 else {
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132 builder = new Builder(template);
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133 }
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134 }
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135 catch (IOException ioe) {
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136 log.error(ioe);
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137 }
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138 finally {
948
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139 if (in != null) {
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140 try {
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141 in.close();
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142 }
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143 catch (IOException ioe) {
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144 log.error(ioe);
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145 }
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146 }
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147 }
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148 }
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149 }
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150 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org