Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MetaDataService.java @ 415:7c018f466d6d

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Datacage: Added river parameter to meta data services. flys-artifacts/trunk@1879 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 10 May 2011 12:43:12 +0000
parents fc3cf0ef777e
children 24b53f9aa9dc
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
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6 import java.sql.Connection;
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7 import java.sql.SQLException;
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8
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9 import org.w3c.dom.Document;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import java.util.Map;
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14 import java.util.HashMap;
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15
372
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16 import de.intevation.artifacts.CallMeta;
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17 import de.intevation.artifacts.ServiceFactory;
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18
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19 import de.intevation.artifactdatabase.DefaultService;
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20
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22
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23 import de.intevation.flys.artifacts.services.meta.Builder;
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24
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25 import de.intevation.flys.backend.SessionHolder;
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26
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27 import org.hibernate.Session;
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28
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29 import org.hibernate.jdbc.Work;
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30
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31 public class MetaDataService
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32 extends DefaultService
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33 {
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34 private static Logger log = Logger.getLogger(MetaDataService.class);
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35
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36 public static final String XPATH_RIVER = "//river/@name";
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37
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38 public static final String META_DATA_TEMPLATE = "/metadata/template.xml";
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39
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40 protected Builder builder;
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41
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42 public MetaDataService() {
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43 }
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44
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45 protected static Map<String, Object> extractParameters(Document data) {
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46 HashMap<String, Object> parameters = new HashMap<String, Object>();
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47
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48 String river = XMLUtils.xpathString(data, XPATH_RIVER, null);
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49
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50 if (river == null || (river = river.trim()).length() == 0) {
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51 river = "%"; // matches all rivers
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52 }
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53
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54 parameters.put("river", river);
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55
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56 return parameters;
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57 }
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58
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59 @Override
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60 public Document process(
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61 Document data,
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62 Object globalContext,
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63 CallMeta callMeta
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64 ) {
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65 log.debug("MetaDataService.process");
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66
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67 final Document result = XMLUtils.newDocument();
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68
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69 if (builder == null) {
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70 log.error("MetaDataService is not setup properly.");
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71 return result;
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72 }
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73
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74 final Map<String, Object> parameters = extractParameters(data);
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75
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76 Session session = SessionHolder.acquire();
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77 try {
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78 session.doWork(new Work() {
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79 @Override
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80 public void execute(Connection connection)
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81 throws SQLException
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82 {
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83 log.debug("MetaDataService.execute");
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84 builder.build(connection, result, parameters);
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85 }
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86 });
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87 }
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88 finally {
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89 session.close();
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90 SessionHolder.release();
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91 }
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92
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93 return result;
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94 }
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95
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96 @Override
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97 public void setup(ServiceFactory factory, Object globalContext) {
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98 log.debug("MetaDataService.setup");
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99
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100 InputStream in = getClass().getResourceAsStream(META_DATA_TEMPLATE);
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101
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102 if (in == null) {
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103 log.error("cannot get template resource");
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104 return;
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105 }
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106
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107 try {
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108 Document template = XMLUtils.parseDocument(in);
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109 if (template == null) {
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110 log.error("cannot parse meta data template");
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111 }
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112 else {
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113 builder = new Builder(template);
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114 }
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115 }
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116 finally {
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117 try {
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118 in.close();
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119 }
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120 catch (IOException ioe) {
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121 log.error(ioe);
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122 }
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123 }
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124 }
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125 }
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126 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org