Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/StateFactory.java @ 4496:d8992459b408

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Add method to return the facets of an artifact This methos should be used to get the facets of an artifact instead of accessing the facets member variable directly.
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 14 Nov 2012 11:11:04 +0100
parents e74e707ff650
children
rev   line source
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1 package de.intevation.flys.artifacts.states;
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2
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3 import javax.xml.xpath.XPathConstants;
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4
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5 import org.apache.log4j.Logger;
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6
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7 import org.w3c.dom.Node;
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8 import org.w3c.dom.NodeList;
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9
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10 import de.intevation.artifactdatabase.data.DefaultStateData;
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11 import de.intevation.artifactdatabase.state.State;
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12
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13 import de.intevation.artifacts.common.utils.XMLUtils;
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14
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15
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16 /**
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17 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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18 */
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19 public class StateFactory {
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20
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21 /** The logger used in this class */
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22 private static Logger logger = Logger.getLogger(StateFactory.class);
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23
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24 /** The XPath to the classname of the state */
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25 public static final String XPATH_STATE = "@state";
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26
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27 /** The XPath to the data items of the state relative to the state node. */
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28 public static final String XPATH_DATA = "data";
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29
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30 /** The XPath to the data name relative to the data node.*/
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31 public static final String XPATH_DATA_NAME = "@name";
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32
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33 /** The XPath to the data type relative to the data node.*/
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34 public static final String XPATH_DATA_TYPE = "@type";
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35
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36 /** The XPath to the data description relative to the data node.*/
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37 public static final String XPATH_DATA_DESCRIPTION = "@description";
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38
108
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39
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40 /**
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41 * Creates a new State based on the configured class provided by
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42 * <code>stateConf</code>.
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43 *
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44 * @param stateConf The configuration of the state.
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45 *
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46 * @return a State.
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47 */
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48 public static State createState(Node stateConf) {
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49 String clazz = (String) XMLUtils.xpath(
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50 stateConf, XPATH_STATE, XPathConstants.STRING);
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51
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52 State state = null;
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53
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54 try {
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55 logger.debug("Create a new State for class: " + clazz);
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56 state = (State) Class.forName(clazz).newInstance();
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57 state.setup(stateConf);
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58
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59 initializeStateData(state, stateConf);
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60 }
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61 catch (InstantiationException ie) {
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62 logger.error(ie, ie);
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63 }
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64 catch (IllegalAccessException iae) {
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65 logger.error(iae, iae);
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66 }
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67 catch (ClassNotFoundException cnfe) {
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68 logger.error(cnfe, cnfe);
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69 }
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70
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71 return state;
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72 }
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73
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74
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75 /**
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76 * This method extracts the configured input data of a state and adds new
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77 * StateData objects to the State.
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78 *
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79 * @param state The state.
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80 * @param stateConf The state configuration node.
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81 */
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82 protected static void initializeStateData(State state, Node stateConf) {
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83 NodeList dataList = (NodeList) XMLUtils.xpath(
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84 stateConf, XPATH_DATA, XPathConstants.NODESET);
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85
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86 if (dataList == null || dataList.getLength() == 0) {
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87 logger.debug("The state has no input data configured.");
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88
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89 return;
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90 }
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91
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92 int items = dataList.getLength();
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93
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94 logger.debug("The state has " + items + " data items configured.");
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95
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96 for (int i = 0; i < items; i++) {
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97 Node data = dataList.item(i);
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98
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99 String name = (String) XMLUtils.xpath(
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100 data, XPATH_DATA_NAME, XPathConstants.STRING);
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101 String type = (String) XMLUtils.xpath(
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102 data, XPATH_DATA_TYPE, XPathConstants.STRING);
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103 String desc = (String) XMLUtils.xpath(
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104 data, XPATH_DATA_DESCRIPTION, XPathConstants.STRING);
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105
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106 if (name == null || name.length() == 0) {
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107 logger.warn("No name for data item at pos " + i + " found.");
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108 continue;
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109 }
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110
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111 if (type == null || type.length() == 0) {
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112 logger.warn("No type for data item at pos " + i + " found.");
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113 logger.warn("Default type 'string' used.");
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114 type = "string";
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115 }
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116
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117 logger.debug("add StateData '" + name + "' (type '" + type + "')");
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118 state.addData(name, new DefaultStateData(name, desc, type));
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119 }
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120 }
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121 }
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122 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org